EP1899095A2 - Device and method for continuously and catalytically removing binder, with improved flow conditions - Google Patents
Device and method for continuously and catalytically removing binder, with improved flow conditionsInfo
- Publication number
- EP1899095A2 EP1899095A2 EP06763566A EP06763566A EP1899095A2 EP 1899095 A2 EP1899095 A2 EP 1899095A2 EP 06763566 A EP06763566 A EP 06763566A EP 06763566 A EP06763566 A EP 06763566A EP 1899095 A2 EP1899095 A2 EP 1899095A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- furnace
- process gas
- binder removal
- gas
- binder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
- B22F3/1025—Removal of binder or filler not by heating only
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/638—Removal thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
- F27B9/021—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces having two or more parallel tracks
- F27B9/022—With two tracks moving in opposite directions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
Definitions
- the invention relates to a device for the catalytic debinding of produced by a powder injection molding process or PIM (Powder Injection Molding), metallic and / or ceramic moldings, in which a plastic is used as an aid for molding.
- a plastic is used as an aid for molding.
- This is usually a polyoxymethylene (POM), which is catalytically dissolved out after shaping in a debindering step, without the moldings themselves changing their shape.
- a reaction partner e.g. Nitric acid in a carrier gas
- suitable process conditions especially in terms of temperature
- the debindering step precedes a sintering step and thus influences, in particular in a continuous process management, the throughput and the quality which are required for the shaped bodies according to their intended purpose after the sintering step.
- the determined binder removal conditions are generally maintained much longer than would be necessary per se.
- the operating costs increase considerably, which are due, among other things, to a high consumption of process gas, the process gas essentially containing reactants and carrier or protective gas.
- Catalytic debinding takes place in kilns in which the green compacts are exposed to a suitable temperature over a period of time in a gaseous, acidic atmosphere.
- the design and materials of the furnace must ensure that the temperature in the furnace volume is constant, and good heat transfer to the bodies to be debinded is achieved. In particular, cold spots in the interior of the furnace system are to be avoided in order to prevent the condensation of decomposition products.
- internals or circulation elements are known from the prior art, which ensure uniform distribution and turbulence of the process gas in the reaction space, so that all green moldings are subject to the same reaction conditions.
- a method for debinding of metallic moldings under vacuum is known.
- the moldings are preheated in a furnace at a certain temperature.
- a gas flow is generated from the furnace wall to the inside of the molds, while at the same time the prevailing pressure is gradually reduced, and the temperature remains constant or gradually increases.
- the binder removal and sintering cycle times are affected.
- deducting the gas from the environment of the moldings i. essentially from the middle of the furnace interior, a pressure difference between the furnace wall and the surroundings of the moldings and thus a radially inwardly directed flow is generated. This flow prevents the binder from condensing or precipitating on the thermal insulation and the furnace wall, which influence the vacuum.
- a continuous catalytic debinder In a continuous catalytic debinder, the flow of the process gas in a suitable apparatus is of particular importance for the efficiency and quality of the debindering step. It is therefore an object of the present invention to provide a device for continuous catalytic debinding in which improved flow conditions prevail in a debinding furnace. Above all, a maximum utilization of the process gas, a minimum short-circuit current and thus a homogeneous process atmosphere in the binder removal furnace should be achieved, at the same time preventing condensation out. This would enable safe process management and a significantly higher throughput of the binder removal furnace.
- a device for the continuous catalytic debinding of metallic and / or ceramic shaped bodies produced by powder injection molding methods comprising a debinding furnace, which the shaped bodies pass through in a transport direction, whereby they are cooled to a suitable process temperature.
- the device according to the invention is then characterized in that one or more devices are present, which lead to a specifically directed transversely to the transport direction flow of the process gas in the device.
- the apparatus for continuous catalytic debinding comprises a debindering oven, through which the moldings to be debindered, for example distributed on transport boxes, are transported in accordance with a suitable dwell time.
- the transport boxes can be designed such that a uniform circulation of the moldings to be debinded is promoted.
- a transport box has a gas-permeable bottom and gas-permeable side walls.
- a vertical flow of the process gas and a desired Queranströmung be achieved.
- An advantageous embodiment of a device for continuous catalytic Entbindem based on the operation of a baffle in which, by the absence of means for transporting populated transport boxes, a narrow tunnel cross-section can be realized.
- a significant improvement in the utilization of the process gas can be achieved.
- a conveyor belt in accordance with the dwell time to be set, conveys the transport boxes equipped with the moldings to be debinded through the debinding furnace. It is known that a forward and return of the conveyor belt are separated by a perforated plate. According to the perforated plate is partially or over the entire length of the conveyor belt replaced by a closed sheet metal. Thus, a short-circuit current of the process gas directed downwards into the region of the conveyor belt return is minimized, which occurs predominantly in the region of the process gas inlet.
- baffles which are provided according to the invention both in an upper region of the binder removal furnace and in the region of a conveyor belt conveyor reduce the short-circuit current of the unused process gas by reducing the free flow cross-section.
- they define a flow path of the process gas directed largely vertically to the transport direction. So, and thus improve the flow around the moldings to be debonded.
- Baffles which are provided in the lower region of the binder removal furnace, in which the conveyor belt runs, force a vertically upward flow of the process gas through the transport boxes and thus contribute to a homogeneous process atmosphere.
- Guide plates which are provided in the upper region of the binder removal furnace, according to the invention can be arranged on the ceiling of the binder removal furnace.
- an arrangement of the baffles on the uppermost layer of the equipped with moldings transport boxes, since so the height of the stored on the transport boxes, to be debinded molding charge can be varied.
- a perforated separation can be provided between two transport boxes which follow one another in the transport direction, so that the residence time of the process gas per charge is further increased.
- one or more circulation devices for example in the form of fans, which are distributed uniformly along the binder removal furnace, can be arranged in the device for continuous catalytic debindering.
- Umisselz Hughesen invention which are arranged either only on one side wall of the binder removal oven or preferably alternately on two opposite side walls, there is a turbulence of the process gas and thereby a homogeneous mixing of the interior of the continuous device.
- An advantageous embodiment provides one or more points of introduction of the process gas into the binder removal furnace.
- a plurality of uniformly distributed introduction points are advantageous, since in this way additional mixing of the interior space is achieved.
- a further preferred embodiment of the device for continuous catalytic debinding aims at a flow of the process gas largely transversely to the transport direction of the stored on transport boxes molding.
- the process gas required for debindering is introduced into the interior of the binder removal furnace via one or preferably several laterally arranged introduction points.
- These lateral discharge points may be evenly distributed over the entire length of the debindering softener or may be provided at only a portion of the same. be.
- introduction points on one side of the binder removal furnace and preferably on two opposite sides with alternating introduction points are conceivable.
- the introduction points may be formed as slots, as holes or as nozzles.
- the process gas thus introduced laterally flows through the transport boxes and thus the moldings to be entbindern largely transverse to the transport direction.
- Such a transverse inflow of the shaped bodies which is achieved by the lateral introduction points of the process gas, can be supplemented by circulating devices arranged on one or both sides.
- a withdrawal of the process gas at the end of the furnace and a return of the same into the feed, which leads to the lateral introduction points process gas can be used.
- a withdrawal of the process gas at the end of the furnace and a return of the same into the feed which leads to the lateral introduction points process gas can be used.
- the continuous catalytic debinding apparatus includes means for heating the process gas prior to entering the furnace, thereby achieving improved utilization of the process gas.
- the device according to the invention for continuous catalytic debindering can be used universally for all processes in which debindering and / or reacting substances take place on the surface of a base body, and in which a directed flow for optimized utilization of the process substances used is to be achieved.
- a further solution to the problem is also a method for the catalytic debinding of produced by powder injection molding, metallic and / or ceramic moldings, wherein the moldings are transported through a debinding furnace according to a predetermined residence time, while at a process temperature in the range of 100 0th C are brought to 150 0 C and the introduced process gas containing a reactant in a carrier gas stream, is brought before introduction to an appropriate temperature.
- the continuous catalytic debinder apparatus 10 comprises a continuous debinder oven 12, which is preferably made of a stainless steel.
- the device for debinding 10 is intended to catalytically unbound ceramic and / or metallic shaped bodies produced in a powder injection molding process. This means that a matrix consisting of a polymeric plastic, which has made possible the production of the shaped bodies in their desired design, should be removed quantitatively therefrom, without the shape of the shaped bodies changing in the process.
- the preferred material system is based on polyoxymethylene (POM) as matrix material.
- the debindering in the continuous binder removal furnace 12 takes place in a reaction space 14.
- a reaction space 14 preferably electrical heating elements ensure a homogeneous adjustment of the reaction temperature in the reaction chamber 14, which is preferably between 110 ° C to 140 ° C. Due to a complex composition of the binder system, a careful temperature adjustment is necessary.
- a gaseous, acidic component e.g. here a highly concentrated nitric acid in a carrier gas stream e.g. Nitrogen used, which reacts with the matrix material in the sense of depolymerization such that arise as end products of the reaction monomeric components of the matrix material in a gaseous state.
- Nitrogen used, which reacts with the matrix material in the sense of depolymerization such that arise as end products of the reaction monomeric components of the matrix material in a gaseous state.
- Liquid nitric acid which is preferably evaporated in a corresponding device directly in the reaction space 14 or in a device 20 upstream of the binder removal furnace 12, is introduced into the reaction space 14, for example, by means of a metering pump 18.
- Typical volume flows of nitric acid are in the inventive device in the range of 0.2 l / h to 1.5 l / h.
- Protective gas purging takes place via a flow rate control valve 22, preferably both at the inlet and at the outlet into the reaction space 14 of the debinder furnace 12.
- Typical values of the nitrogen volume flow are at the entrance of the binder removal furnace between 0.5 m 3 / h and 3 m 3 / h and at the output between 6 m 3 / h to 20 m 3 / h.
- the details of the volume flows of nitric acid, carrier gas and protective gas relate to a volume of the preferably cuboid reaction space 14 with values typically in a range from 0.3 m 3 to 0.6 m 3 .
- the reaction products formed by the depolymerization reaction are converted in the torch 16 by burning into oxidic substances which can be safely released into the atmosphere.
- the torch 16 is preferably arranged vertically standing on the top of the binder removal furnace 12.
- the moldings to be entbined are introduced into the reaction chamber 14 of the binder removal furnace 12, which is preferably heated by electrical heating elements.
- the shaped bodies can be distributed on transport boxes, which in turn are preferably permeable to the process gas at the bottom and at the side walls.
- the transport boxes consist of perforated bottom and intermediate plates, which promote a flow around the charge of moldings stored thereon. Between individual in the transport direction successive transport boxes or batches according to the invention perforated sheets can be provided, which act as a kind of vertical separation. As a result, a vertically directed flow path of the process gas is achieved and thus improves the flow through the transport boxes.
- the loaded transport boxes are transported through the reaction space 14 of the binder removal furnace 12, preferably by means of a conveyor belt 24.
- a device based on the principle of a baffle can be used.
- a separation of feed and return of the conveyor belt 24 is known by a perforated plate.
- this perforated separating plate in particular at the inlet of the process gas, leads to a significant, downwardly directed short-circuit current, as a result of which the process gas flows counter to the outlet without being used.
- the perforated separating plate in regions, in particular in the region of the gas inlet or preferably over the entire length of the reaction chamber 14, is replaced by a closed plate.
- a downward short-circuit current decreases.
- baffles In the upper region of the reaction space 14, flow paths of the process gas are defined by baffles. These baffles can be attached to the ceiling of the largely cuboid reaction chamber 14. As a result, the process gas is deflected, which increases its residence time, based on a stored on the transport boxes batch, and an unused short-circuit current is reduced.
- baffles are arranged on top of the transport boxes, whereby the height of the stored thereon, to be debinded moldings can be varied.
- baffles are provided in the lower part of the binder removal furnace 12, in which the conveyor belt is guided, which force an upward flow path of the process gas.
- one or more circulation devices for example blowers or fans, are provided on a side wall of the binder removal furnace 12 and preferably alternately on two opposite side walls of the binder removal furnace 12.
- one or more points of introduction of the process gas which are provided under fluidic aspects of the binder removal furnace, favor a desired turbulence of the process gas and / or an advantageous transverse flow of the moldings to be debinded.
- injecting the process gas from above at high speed into the reaction space 14 of the binder removal furnace 12, preferably between successive transport boxes, can contribute to a turbulence of the process gas and thus to a homogenization of the process atmosphere.
- the transverse flow can be achieved by a lateral introduction of the process gas into the binder removal furnace 12 according to the invention.
- the introduction can take place in regions or preferably evenly distributed along the entire length of the binder removal furnace 12.
- the introduction may be provided along one side of the debinder oven 12, preferably on two opposite sides of the debinder oven 12, the initiation being opposed to two opposite one another. Overlying sides of the binder removal furnace 12 preferably takes place alternately.
- the introduction can be made via slots, holes or nozzles in the side walls of the binder removal furnace 12.
- Particularly advantageous is a lateral introduction of the process gas at two opposite side walls of the binder removal furnace 12 with mutually arranged discharge points, which are supplemented at the respective opposite side wall of the binder removal furnace 12 by circulating means.
- the thus achieved thorough mixing of the interior of the reaction chamber 14 and the transverse flow according to the invention lead to a homogeneous temperature and process gas distribution while accelerated removal of reaction products from the environment of the moldings to be entbindernden. This will create the conditions for a steady and accelerated process of exemption.
- the internals and devices used result in a homogeneous mixing of the interior space and a flow path of the process gas which extends largely transversely to the transport direction.
- This achieves a uniform distribution of the temperature and of the reactant as well as a removal of reaction products from the surroundings of the moldings, thereby creating a process atmosphere which leads to an efficient and to the same extent shortened debindering step while maintaining the same high quality of debindering.
- the lateral introduction of the process gas according to the invention results in a maximized utilization of the process substances used.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
- Tunnel Furnaces (AREA)
- Powder Metallurgy (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a device for continuously and catalytically removing binder from metallic and/or ceramic moulded bodies produced by powder injection moulding, the device comprising a binder-removing furnace, through which the moulded bodies pass in a direction of conveyance and in which they are brought to a suitable processing temperature, a conveying device, for introducing a process gas which is needed to remove the binder and contains a reaction partner, at least one device for introducing a protective gas into a reaction chamber of the binder-removing furnace, and a burner, for burning the gaseous reaction products that result from the binder removing process, one or more devices being included which lead to a targeted flow of the process gas in the device transversely to the direction of conveyance.
Description
Vorrichtung und Verfahren zum kontinuierlichen katalytischen Entbindem mit verbesserten StrömungsbedingungenApparatus and method for continuous catalytic debinding with improved flow conditions
Beschreibungdescription
Die Erfindung betrifft eine Vorrichtung zum katalytischen Entbindem von durch ein Pulver-Spritzgussverfahren oder PIM (Powder Injection Molding) hergestellte, metallische und/oder keramische Formkörper, bei denen als Hilfsmittel zur Formgebung ein Kunststoff eingesetzt wird. Meist ist dies ein Polyoxymethylen (POM), das katalytisch nach der Formgebung in einem Entbinderungsschritt herausgelöst wird, ohne dass die Formkörper selbst ihre Form verändern. Bei einem katalytischen Entbindem der so genannten grünen Formteile bzw. Grünlinge wird unter Mitwirkung eines Reaktionspartners, z.B. Salpetersäure in einem Trägergas, und unter geeigneten Prozessbedingungen, insbesondere hinsichtlich Temperatur, der verwendete Kunststoff in niedrig- molekulare, in gasförmigem Zustand vorliegende Bestandteile zerlegt und diese durch Abfackeln in umweltverträgliche Verbindungen umgewandelt.The invention relates to a device for the catalytic debinding of produced by a powder injection molding process or PIM (Powder Injection Molding), metallic and / or ceramic moldings, in which a plastic is used as an aid for molding. This is usually a polyoxymethylene (POM), which is catalytically dissolved out after shaping in a debindering step, without the moldings themselves changing their shape. In the case of catalytic debinding of the so-called green moldings or green compacts, with the assistance of a reaction partner, e.g. Nitric acid in a carrier gas, and under suitable process conditions, especially in terms of temperature, decomposed the plastic used in low molecular weight, in the gaseous state present constituents and converted by flaring into environmentally friendly compounds.
Der Entbinderungsschritt ist einem Sinterschritt vorgeschaltet und beeinflusst somit, insbesondere bei einer kontinuierlichen Prozessführung, den Durchsatz und die Quali- tat, die für die Formkörper entsprechend ihres Bestimmungszweckes nach dem Sinterschritt erforderlich sind. Um eine quantitative Entfernung des Kunststoffs aus den Formkörpern sicher zu stellen, werden im Allgemeinen die ermittelten Entbinderungs- bedingungen wesentlich länger aufrechterhalten als dies an sich erforderlich wäre. Dadurch steigen die Betriebskosten erheblich, die unter anderem bedingt sind durch ei- nen hohen Verbrauch an Prozessgas, wobei das Prozessgas im Wesentlichen Reaktionspartner und Träger- bzw. Schutzgas enthält.The debindering step precedes a sintering step and thus influences, in particular in a continuous process management, the throughput and the quality which are required for the shaped bodies according to their intended purpose after the sintering step. In order to ensure a quantitative removal of the plastic from the moldings, the determined binder removal conditions are generally maintained much longer than would be necessary per se. As a result, the operating costs increase considerably, which are due, among other things, to a high consumption of process gas, the process gas essentially containing reactants and carrier or protective gas.
Eine katalytische Entbinderung findet in Ofenanlagen statt, in denen die Grünlinge in einer gasförmigen, säurehaltigen Atmosphäre über einen Zeitraum einer geeigneten Temperatur ausgesetzt werden. Die Konstruktion und die Materialien des Ofens müssen gewährleisten, dass die Temperatur in dem Ofenvolumen konstant ist, und eine gute Wärmeübertragung auf die zu entbindernden Körper erreicht wird. Insbesondere sind kalte Stellen im Inneren der Ofenanlage zu vermeiden, um das Auskondensieren von Zersetzungsprodukten zu verhindern. Bei Batch-Öfen sind aus dem Stand der Technik Einbauten bzw. Umwälzelemente bekannt, die für eine gleichmäßige Verteilung und Verwirbelung des Prozessgases im Reaktionsraum sorgen, so dass sämtliche grüne Formkörper gleichen Reaktionsbedingungen unterliegen.Catalytic debinding takes place in kilns in which the green compacts are exposed to a suitable temperature over a period of time in a gaseous, acidic atmosphere. The design and materials of the furnace must ensure that the temperature in the furnace volume is constant, and good heat transfer to the bodies to be debinded is achieved. In particular, cold spots in the interior of the furnace system are to be avoided in order to prevent the condensation of decomposition products. In the case of batch furnaces, internals or circulation elements are known from the prior art, which ensure uniform distribution and turbulence of the process gas in the reaction space, so that all green moldings are subject to the same reaction conditions.
Es hat sich bei herkömmlichen kontinuierlichen Ofenanlagen gezeigt, dass ein be- trächtlicher Teil des Prozessgases als Kurzschlussstrom ungenutzt an den in einer
Charge befindlichen Formkörpem vorbei in einen Abgaskamin strömt. Auch ein Abzug des Prozessgases in Nähe des Abgaskamins und Rückführung desselben in den Gaseintritt führt nicht zu einer nennenswerten Verbesserung der Ausnutzung des eingebrachten Prozessgases.It has been found in conventional continuous furnace systems, that a considerable part of the process gas as short-circuit current unused to the in one Charge Formkörpem past flows into an exhaust stack. Also, a withdrawal of the process gas in the vicinity of the exhaust stack and return of the same in the gas inlet does not lead to a significant improvement in the utilization of the introduced process gas.
Ebenfalls bekannt ist ein zusätzliches Einleiten eines Schutzgasstroms am Ende der Ofenanlage, um eine verbesserte Verwirbelung des Prozessgases im Inneren desselben zu erzielen. Allerdings führt der eingebrachte, kalte Schutzgasstrom zu einer derartigen Abkühlung in Bereichen der Ofenanlage, dass es zum unerwünschten Auskon- densieren von Prozessstoffen kommen kann.Also known is an additional introduction of a protective gas stream at the end of the furnace system in order to achieve an improved turbulence of the process gas in the interior of the same. However, the introduced, cold inert gas flow leads to such a cooling in areas of the furnace, that it can lead to the unwanted condense out of process materials.
Aus JP-A 06/122903 ist ein Verfahren zum Entbindem von metallischen Formkörpern unter Vakuum bekannt. Hierbei werden in einem Ofen die Formkörper bei einer bestimmten Temperatur vorgewärmt. Eine Gasströmung wird von der Ofenwand ins Inne- re hin zu den Formkörpern erzeugt, während gleichzeitig der herrschende Druck schrittweise reduziert wird, und die Temperatur konstant bleibt oder graduell ansteigt. Durch geeignete Wahl der Vorheizbedingungen, der Gasströmung und des veränderlichen Ofendrucks wird Einfluss auf die Zykluszeiten beim Entfernen des Bindemittels und auf das Sintern genommen. Durch Abzug des Gases aus der Umgebung der Formkörper, d.h. im Wesentlichen aus der Mitte des Ofeninnenraums, wird eine Druckdifferenz zwischen Ofenwand und Umgebung der Formkörper und somit eine radial nach innen gerichtete Strömung erzeugt. Diese Strömung verhindert ein Auskondensieren oder Ausfallen des Binders an der thermischen Isolation und der Ofenwand, welche Einfluss auf das Vakuum nehmen.From JP-A 06/122903 a method for debinding of metallic moldings under vacuum is known. Here, the moldings are preheated in a furnace at a certain temperature. A gas flow is generated from the furnace wall to the inside of the molds, while at the same time the prevailing pressure is gradually reduced, and the temperature remains constant or gradually increases. By appropriate choice of preheat conditions, gas flow, and variable furnace pressure, the binder removal and sintering cycle times are affected. By deducting the gas from the environment of the moldings, i. essentially from the middle of the furnace interior, a pressure difference between the furnace wall and the surroundings of the moldings and thus a radially inwardly directed flow is generated. This flow prevents the binder from condensing or precipitating on the thermal insulation and the furnace wall, which influence the vacuum.
Bei einem kontinuierlichen katalytischen Entbindem ist die Strömungsführung des Prozessgases in einer geeigneten Vorrichtung von besonderer Bedeutung für die Effizienz und Qualität des Entbinderungsschritts. Aufgabe der vorliegenden Erfindung ist es demnach, eine Vorrichtung zum kontinuierlichen katalytischen Entbindem bereitzustel- len, bei der in einem Entbinderungsofen verbesserte Strömungsbedingungen herrschen. Vor allem sollen eine maximale Ausnutzung des Prozessgases, ein minimaler Kurzschlussstrom und somit eine homogene Prozessatmosphäre in dem Entbinderungsofen erreicht werden, wobei gleichzeitig ein Auskondensieren verhindert wird. Dadurch würden eine sichere Prozessführung und ein wesentlich höherer Durchsatz des Entbinderungsofens möglich.In a continuous catalytic debinder, the flow of the process gas in a suitable apparatus is of particular importance for the efficiency and quality of the debindering step. It is therefore an object of the present invention to provide a device for continuous catalytic debinding in which improved flow conditions prevail in a debinding furnace. Above all, a maximum utilization of the process gas, a minimum short-circuit current and thus a homogeneous process atmosphere in the binder removal furnace should be achieved, at the same time preventing condensation out. This would enable safe process management and a significantly higher throughput of the binder removal furnace.
Die Lösung der Aufgabe geht aus von einer Vorrichtung zum kontinuierlichen katalytischen Entbindem von durch Pulver-Spritzgussverfahren hergestellte metallische und/oder keramische Formkörper, aufweisend einen Entbinderungsofen, den die Formkörper in einer Transportrichtung durchlaufen, wobei sie auf eine geeignete Prozesstempera-
tur gebracht werden, eine Fördereinrichtung für das Einleiten eines für die Entbinde- rung erforderlichen Prozessgases, welches einen Reaktionspartner beinhaltet, mindestens eine Einrichtung zum Einleiten eines Schutzgases in einen Reaktionsraum des Entbinderungsofens und eine Fackel, um die bei der Entbinderung anfallenden gas- förmigen Reaktionsprodukte zu verbrennen. Die erfindungsgemäße Vorrichtung ist dann dadurch gekennzeichnet, dass eine oder mehrere Einrichtungen vorhanden sind, die zu einer gezielt quer zur Transportrichtung gerichteten Strömung des Prozessgases in der Vorrichtung führen.The object is achieved by a device for the continuous catalytic debinding of metallic and / or ceramic shaped bodies produced by powder injection molding methods, comprising a debinding furnace, which the shaped bodies pass through in a transport direction, whereby they are cooled to a suitable process temperature. a conveying device for introducing a required for the debinder process gas, which includes a reactant, at least one means for introducing a protective gas in a reaction chamber of the binder and a torch to the incurred in the debindering gaseous reaction products burn. The device according to the invention is then characterized in that one or more devices are present, which lead to a specifically directed transversely to the transport direction flow of the process gas in the device.
Die Vorrichtung zum kontinuierlichen katalytischen Entbindem weist einen Entbinde- rungsofen auf, durch welchen die zu entbindernden Formkörper, beispielsweise verteilt auf Transportkästen, entsprechend einer geeigneten Verweilzeit transportiert werden.The apparatus for continuous catalytic debinding comprises a debindering oven, through which the moldings to be debindered, for example distributed on transport boxes, are transported in accordance with a suitable dwell time.
Die Transportkästen können derart gestaltet sein, dass eine gleichmäßige Umströ- mung der zu entbindernden Formkörper begünstigt wird. Hierfür ist es zweckmäßig, dass ein Transportkasten einen gasdurchlässigen Boden und gasdurchlässige Seitenwände aufweist. Somit werden eine vertikale Durchströmung des Prozessgases und eine angestrebte Queranströmung erzielt.The transport boxes can be designed such that a uniform circulation of the moldings to be debinded is promoted. For this purpose, it is expedient that a transport box has a gas-permeable bottom and gas-permeable side walls. Thus, a vertical flow of the process gas and a desired Queranströmung be achieved.
Eine vorteilhafte Ausführungsform einer Vorrichtung zum kontinuierlichen katalytischen Entbindem basiert auf der Funktionsweise eines Stossofens, bei dem, durch das Fehlen von Einrichtungen zum Transport von bestückten Transportkästen, ein enger Tunnelquerschnitt realisiert werden kann. Somit kann eine deutliche Verbesserung der Ausnutzung des Prozessgases erreicht werden.An advantageous embodiment of a device for continuous catalytic Entbindem based on the operation of a baffle, in which, by the absence of means for transporting populated transport boxes, a narrow tunnel cross-section can be realized. Thus, a significant improvement in the utilization of the process gas can be achieved.
Im Allgemeinen fördert in einer Vorrichtung zum kontinuierlichen katalytischen Entbindem ein Transportband, entsprechend der einzustellenden Verweilzeit, die mit den zu entbindernden Formkörpern bestückten Transportkästen durch den Entbinderungso- fen. Hierbei ist bekannt, dass eine Hin- und Rückführung des Transportbandes durch ein perforiertes Blech voneinander getrennt sind. Erfindungsgemäß wird das perforierte Blech teilweise oder über die gesamte Länge des Transportbandes durch ein geschlossenes Blech ersetzt. Somit wird ein nach unten, in den Bereich der Transportbandrückführung gerichteter Kurzschlussstrom des Prozessgases minimiert, welcher überwiegend im Bereich des Prozessgaseintritts in Erscheinung tritt.In general, in a device for continuous catalytic debinding, a conveyor belt, in accordance with the dwell time to be set, conveys the transport boxes equipped with the moldings to be debinded through the debinding furnace. It is known that a forward and return of the conveyor belt are separated by a perforated plate. According to the perforated plate is partially or over the entire length of the conveyor belt replaced by a closed sheet metal. Thus, a short-circuit current of the process gas directed downwards into the region of the conveyor belt return is minimized, which occurs predominantly in the region of the process gas inlet.
Vorteilhaft verringern Leitbleche, welche sowohl in einem oberen Bereich des Entbinderungsofens als auch im Bereich einer Transportbandförderung erfindungsgemäß vorgesehen sind, den Kurzschlussstrom des ungenutzten Prozessgases durch eine Reduzierung des freien Strömungsquerschnitts. Darüber hinaus definieren sie einen weitgehend vertikal zur Transportrichtung gerichteten Strömungsweg des Prozessga-
ses, und verbessern somit das Umströmen der zu entbindernden Formkörpern. Leitbleche, welche in dem unteren Bereich des Entbinderungsofens, in dem das Transportband läuft, vorgesehen sind, erzwingen eine vertikal nach oben gerichtete Strömung des Prozessgases durch die Transportkästen hindurch und tragen somit zu einer homogenen Prozessatmosphäre bei.Advantageously, baffles which are provided according to the invention both in an upper region of the binder removal furnace and in the region of a conveyor belt conveyor reduce the short-circuit current of the unused process gas by reducing the free flow cross-section. In addition, they define a flow path of the process gas directed largely vertically to the transport direction. So, and thus improve the flow around the moldings to be debonded. Baffles, which are provided in the lower region of the binder removal furnace, in which the conveyor belt runs, force a vertically upward flow of the process gas through the transport boxes and thus contribute to a homogeneous process atmosphere.
Leitbleche, welche in dem oberen Bereich des Entbinderungsofens vorgesehen sind, können erfindungsgemäß an der Decke des Entbinderungsofens angeordnet sein. Bevorzugt ist eine Anordnung der Leitbleche auf der obersten Lage der mit Formkörpern bestückten Transportkästen, da so die Höhe der auf den Transportkästen lagernden, zu entbindernden Formkörpercharge variiert werden kann.Guide plates, which are provided in the upper region of the binder removal furnace, according to the invention can be arranged on the ceiling of the binder removal furnace. Preferably, an arrangement of the baffles on the uppermost layer of the equipped with moldings transport boxes, since so the height of the stored on the transport boxes, to be debinded molding charge can be varied.
Ergänzend kann zwischen zwei in Transportrichtung aufeinander folgenden Transportkästen eine perforierte Trennung vorgesehen sein, damit die Verweilzeit des Prozess- gases pro Charge weiter erhöht wird.In addition, a perforated separation can be provided between two transport boxes which follow one another in the transport direction, so that the residence time of the process gas per charge is further increased.
Erfindungsgemäß können in der Vorrichtung zum kontinuierlichen katalytischen Ent- bindern eine oder mehrere entlang des Entbinderungsofens gleichmäßig verteilte Umwälzeinrichtungen, beispielsweise in Form von Ventilatoren, angeordnet sein. Durch die erfindungsgemäßen Umwälzeinrichtungen, die entweder nur an einer Seitenwand des Entbinderungsofens oder bevorzugt im Wechsel an zwei einander gegenüberliegenden Seitenwänden angeordnet sind, erfolgt eine Verwirbelung des Prozessgases und dadurch eine homogene Durchmischung des Innenraums der kontinuierlichen Vorrichtung. Gleichzeitig wird eine effizienzsteigernde erfindungsgemäße Queranströmung des Prozessgases, bezogen auf die zu entbindernden Formkörper, erreicht.According to the invention, one or more circulation devices, for example in the form of fans, which are distributed uniformly along the binder removal furnace, can be arranged in the device for continuous catalytic debindering. By Umwälzeinrichtungen invention, which are arranged either only on one side wall of the binder removal oven or preferably alternately on two opposite side walls, there is a turbulence of the process gas and thereby a homogeneous mixing of the interior of the continuous device. At the same time, an efficiency-increasing transverse flow according to the invention of the process gas, based on the moldings to be debinded, is achieved.
Eine vorteilhafte Ausführungsform sieht eine oder mehrere Einleitungsstellen des Prozessgases in den Entbinderungsofen vor. Insbesondere sind mehrere gleichmäßig verteilte Einleitungsstellen vorteilhaft, da auf diese Weise eine zusätzliche Durchmi- schung des Innenraumes erreicht wird. So führt ein Einbringen des Prozessgases an mehreren Stellen von oben in den Entbinderungsofen, bevorzugt mit hoher Geschwindigkeit, zu einer günstigen vertikalen Strömung.An advantageous embodiment provides one or more points of introduction of the process gas into the binder removal furnace. In particular, a plurality of uniformly distributed introduction points are advantageous, since in this way additional mixing of the interior space is achieved. Thus, introduction of the process gas at several points from the top into the binder removal furnace, preferably at high speed, leads to a favorable vertical flow.
Eine weitere bevorzugte Ausführungsform der Vorrichtung zum kontinuierlichen kataly- tischen Entbindem strebt eine Strömung des Prozessgases weitgehend quer zur Transportrichtung der auf Transportkästen lagernden Formkörper an. Hierfür wird das zum Entbindem erforderliche Prozessgas über eine oder bevorzugt über mehrere seitlich angeordnete Einleitungsstellen ins Innere des Entbinderungsofens eingebracht. Diese seitlichen Einleitungsstellen können über die gesamte Länge des Entbinderung- sofens gleichmäßig verteilt sein oder auch nur an einem Abschnitt desselben vorgese-
hen sein. Hierbei sind Einleitungsstellen an einer Seite des Entbinderungsofens und bevorzugt an zwei einander gegenüberliegenden Seiten mit im Wechsel angeordneten Einleitungsstellen denkbar. Die Einleitungsstellen können als Schlitze, als Bohrungen oder als Düsen ausgebildet sein. Das somit seitlich eingeleitete Prozessgas durch- strömt die Transportkästen und damit die zu entbindernden Formkörper weitgehend quer zu der Transportrichtung.A further preferred embodiment of the device for continuous catalytic debinding aims at a flow of the process gas largely transversely to the transport direction of the stored on transport boxes molding. For this purpose, the process gas required for debindering is introduced into the interior of the binder removal furnace via one or preferably several laterally arranged introduction points. These lateral discharge points may be evenly distributed over the entire length of the debindering softener or may be provided at only a portion of the same. be. In this case, introduction points on one side of the binder removal furnace and preferably on two opposite sides with alternating introduction points are conceivable. The introduction points may be formed as slots, as holes or as nozzles. The process gas thus introduced laterally flows through the transport boxes and thus the moldings to be entbindern largely transverse to the transport direction.
Eine solche Queranströmung der Formkörper, welche durch die seitlichen Einleitungsstellen des Prozessgases erreicht wird, kann durch einseitig oder beidseitig angeord- nete Umwälzeinrichtungen ergänzt werden.Such a transverse inflow of the shaped bodies, which is achieved by the lateral introduction points of the process gas, can be supplemented by circulating devices arranged on one or both sides.
Vorzugsweise können ein Abziehen des Prozessgases am Ende des Ofens und eine Rückführung desselben in die Zuführung, die zu den seitlichen Einleitungsstellen Prozessgases führt, eingesetzt werden. Somit wird erreicht, dass nicht nur der ungenutzte Kurzschlussstrom gespeist wird, sondern durch die Queranströmung der Formkörper eine effiziente Ausnutzung des Prozessgases erzielt wird.Preferably, a withdrawal of the process gas at the end of the furnace and a return of the same into the feed, which leads to the lateral introduction points process gas can be used. Thus, it is achieved that not only the unused short-circuit current is fed, but by the Queranströmung the moldings efficient utilization of the process gas is achieved.
In einer weiteren Ausführungsform umfasst die Vorrichtung zum kontinuierlichen kata- lytischen Entbindern Einrichtungen, um das Prozessgas vor seinem Eintritt in den Ofen zu erwärmen, womit eine verbesserte Ausnutzung des Prozessgases erreicht wird.In another embodiment, the continuous catalytic debinding apparatus includes means for heating the process gas prior to entering the furnace, thereby achieving improved utilization of the process gas.
Die erfindungsgemäße Vorrichtung zum kontinuierlichen katalytischen Entbindern kann universell für alle Prozesse angewandt werden, bei denen ein Entbindern und/oder ein Abreagieren von Stoffen an der Oberfläche eines Grundkörpers stattfinden, und bei denen eine gelenkte Strömung zur optimierten Ausnutzung der eingesetzten Prozessstoffe erreicht werden soll.The device according to the invention for continuous catalytic debindering can be used universally for all processes in which debindering and / or reacting substances take place on the surface of a base body, and in which a directed flow for optimized utilization of the process substances used is to be achieved.
Eine weitere Lösung der gestellten Aufgabe ist auch ein Verfahren zum katalytischen Entbindern von durch Pulver-Spritzgussverfahren hergestellte, metallische und/oder keramische Formkörper, wobei die Formkörper durch einen Entbinderungsofen entsprechend einer vorgegebenen Verweilzeit transportiert werden, während sie auf eine Prozesstemperatur im Bereich von 1000C bis 1500C gebracht werden und das eingebrachte Prozessgas, welches einen Reaktionspartner in einem Trägergasstrom enthält, vor der Einleitung auf eine entsprechende Temperatur gebracht wird.A further solution to the problem is also a method for the catalytic debinding of produced by powder injection molding, metallic and / or ceramic moldings, wherein the moldings are transported through a debinding furnace according to a predetermined residence time, while at a process temperature in the range of 100 0th C are brought to 150 0 C and the introduced process gas containing a reactant in a carrier gas stream, is brought before introduction to an appropriate temperature.
Die Erfindung wird im Folgenden anhand der Zeichnung näher erläutert.The invention will be explained in more detail below with reference to the drawing.
Hierbei zeigt die Figur die erfindungsgemäße Vorrichtung in schematischer Darstellung.
Die erfindungsgemäße Vorrichtung zum kontinuierlichen katalytischen Entbindem 10 umfasst einen kontinuierlichen Entbinderungsofen 12, welcher vorzugsweise aus einem rostfreien Stahl gefertigt ist. Die Vorrichtung zum Entbindem 10 ist dafür vorgesehen, in einem Pulver-Spritzgussverfahren hergestellte keramische und/oder metalli- sehe Formkörper katalytisch zu entbindem. Dies bedeutet, dass eine aus einem poly- meren Kunststoff bestehende Matrix, die die Herstellung der Formkörper in ihrer gewünschten Gestaltung ermöglicht hat, quantitativ daraus entfernt werden soll, ohne dass die Gestaltung der Formkörper sich dabei verändert. Das bevorzugte Stoffsystem basiert auf Polyoxymethylen (POM) als Matrixmaterial.Here, the figure shows the device according to the invention in a schematic representation. The continuous catalytic debinder apparatus 10 according to the invention comprises a continuous debinder oven 12, which is preferably made of a stainless steel. The device for debinding 10 is intended to catalytically unbound ceramic and / or metallic shaped bodies produced in a powder injection molding process. This means that a matrix consisting of a polymeric plastic, which has made possible the production of the shaped bodies in their desired design, should be removed quantitatively therefrom, without the shape of the shaped bodies changing in the process. The preferred material system is based on polyoxymethylene (POM) as matrix material.
Die Entbinderung in dem kontinuierlichen Entbinderungsofen 12 erfolgt in einem Reaktionsraum 14. In der Figur nicht dargestellte, vorzugsweise elektrische Heizelemente gewährleisten eine homogene Einstellung der Reaktionstemperatur in dem Reaktionsraum 14, die bevorzugt zwischen 110°C bis 140°C liegt. Aufgrund einer komplexen Zusammensetzung des Bindersystems ist eine sorgfältige Temperatureinstellung notwendig.The debindering in the continuous binder removal furnace 12 takes place in a reaction space 14. In the figure, not shown, preferably electrical heating elements ensure a homogeneous adjustment of the reaction temperature in the reaction chamber 14, which is preferably between 110 ° C to 140 ° C. Due to a complex composition of the binder system, a careful temperature adjustment is necessary.
Als Reaktionspartner in dem Reaktionsraum 14 wird eine gasförmige, säurehaltige Komponente, z.B. hier eine hochkonzentrierte Salpetersäure in einem Trägergasstrom z.B. Stickstoff eingesetzt, die mit dem Matrixmaterial im Sinne einer Depolymerisierung derart reagiert, dass als Endprodukte der Reaktion monomere Bestandteile des Matrixmaterials in gasförmigem Zustand anfallen. Diese Bestandteile werden in einer mit 16 bezeichneten Fackel verbrannt. Während des Entbinderungsschrittes wird der Reaktionsraum 14 des Entbinderungsofens 12 ständig mit Stickstoff als Schutzgas ge- spült.As a reactant in the reaction space 14, a gaseous, acidic component, e.g. here a highly concentrated nitric acid in a carrier gas stream e.g. Nitrogen used, which reacts with the matrix material in the sense of depolymerization such that arise as end products of the reaction monomeric components of the matrix material in a gaseous state. These ingredients are burned in a torch designated 16. During the binder removal step, the reaction space 14 of the binder removal furnace 12 is constantly purged with nitrogen as protective gas.
Flüssige Salpetersäure, die vorzugsweise in einer entsprechenden Einrichtung direkt in dem Reaktionsraum 14 oder in einer dem Entbinderungsofen 12 vorgeschalteten Einrichtung 20 verdampft wird, wird beispielsweise mittels einer Dosierpumpe 18 in den Reaktionsraum 14 eingeleitet. Typische Volumenströme an Salpetersäure liegen bei der erfindungsgemäßen Vorrichtung im Bereich von 0,2 l/h bis 1,5 l/h.Liquid nitric acid, which is preferably evaporated in a corresponding device directly in the reaction space 14 or in a device 20 upstream of the binder removal furnace 12, is introduced into the reaction space 14, for example, by means of a metering pump 18. Typical volume flows of nitric acid are in the inventive device in the range of 0.2 l / h to 1.5 l / h.
Die Schutzgasspülung erfolgt über ein Durchfluss-Mengen-Regelventile 22, bevorzugt sowohl am Eingang als auch am Ausgang in den Reaktionsraum 14 des Entbinde- rungsofens 12. Typische Werte des Stickstoffvolumenstroms liegen am Eingang des Entbinderungsofens zwischen 0,5 m3/h bis 3 m3/h und am Ausgang zwischen 6 m3/h bis 20 m3/h.
Die Angaben der Volumenströme von Salpetersäure, Trägergas und Schutzgas beziehen sich auf ein Volumen des bevorzugt quaderförmigen Reaktionsraumes 14 mit Werten typischerweise in einem Bereich von 0,3 m3 bis 0,6 m3.Protective gas purging takes place via a flow rate control valve 22, preferably both at the inlet and at the outlet into the reaction space 14 of the debinder furnace 12. Typical values of the nitrogen volume flow are at the entrance of the binder removal furnace between 0.5 m 3 / h and 3 m 3 / h and at the output between 6 m 3 / h to 20 m 3 / h. The details of the volume flows of nitric acid, carrier gas and protective gas relate to a volume of the preferably cuboid reaction space 14 with values typically in a range from 0.3 m 3 to 0.6 m 3 .
Die durch die Depolymerisierungsreaktion entstehenden Reaktionsprodukte werden in der Fackel 16 durch Verbrennen in oxidische Stoffe umgewandelt, die unbedenklich in die Atmosphäre abgegeben werden können. Die Fackel 16 ist vorzugsweise vertikal stehend an der Oberseite des Entbinderungsofens 12 angeordnet.The reaction products formed by the depolymerization reaction are converted in the torch 16 by burning into oxidic substances which can be safely released into the atmosphere. The torch 16 is preferably arranged vertically standing on the top of the binder removal furnace 12.
Die zu entbindernden Formkörper werden in den Reaktionsraum 14 des Entbinderungsofens 12 eingebracht, der vorzugsweise durch elektrische Heizelemente beheizt wird. Hierbei können die Formkörper erfindungsgemäß auf Transportkästen verteilt sein, die ihrerseits vorzugsweise am Boden und an den Seitenwänden für das Prozessgas durchlässig sind. Beispielsweise bestehen die Transportkästen aus perforier- ten Boden- und Zwischenblechen, die eine Umströmung der darauf gelagerten Charge an Formkörpern begünstigen. Zwischen einzelnen in Transportrichtung aufeinander folgenden Transportkästen bzw. Chargen können erfindungsgemäß perforierte Bleche vorgesehen sein, die als eine Art vertikale Trennung wirken. Dadurch wird ein vertikal gerichteter Strömungsweg des Prozessgases erzielt und somit die Durchströmung der Transportkästen verbessert.The moldings to be entbined are introduced into the reaction chamber 14 of the binder removal furnace 12, which is preferably heated by electrical heating elements. In this case, according to the invention, the shaped bodies can be distributed on transport boxes, which in turn are preferably permeable to the process gas at the bottom and at the side walls. For example, the transport boxes consist of perforated bottom and intermediate plates, which promote a flow around the charge of moldings stored thereon. Between individual in the transport direction successive transport boxes or batches according to the invention perforated sheets can be provided, which act as a kind of vertical separation. As a result, a vertically directed flow path of the process gas is achieved and thus improves the flow through the transport boxes.
Die bestückten Transportkästen werden durch den Reaktionsraum 14 des Entbinderungsofens 12 vorzugsweise mittels eines Transportbandes 24 transportiert. Aber auch zur Verringerung des Querschnitts des Entbinderungsofens kann eine auf dem Prinzip eines Stossofens basierende Vorrichtung eingesetzt werden. Bekannt ist eine Trennung von Hinführung und Rückführung des Transportbandes 24 durch ein perforiertes Blech. Allerdings führt dieses perforierte Trennblech, insbesondere am Eintritt des Prozessgases, zu einem nennenswerten, nach unten gerichteten Kurzschlussstrom, wodurch das Prozessgas ungenutzt dem Austritt entgegenströmt. Deshalb wird das perfo- rierte Trennblech in Bereichen, insbesondere im Bereich des Gaseintritts oder bevorzugt über die gesamte Länge des Reaktionsraumes 14, durch ein geschlossenes Blech ersetzt. Somit verringert sich ein nach unten gerichteter Kurzschlussstrom.The loaded transport boxes are transported through the reaction space 14 of the binder removal furnace 12, preferably by means of a conveyor belt 24. But also to reduce the cross section of the binder removal furnace, a device based on the principle of a baffle can be used. A separation of feed and return of the conveyor belt 24 is known by a perforated plate. However, this perforated separating plate, in particular at the inlet of the process gas, leads to a significant, downwardly directed short-circuit current, as a result of which the process gas flows counter to the outlet without being used. For this reason, the perforated separating plate in regions, in particular in the region of the gas inlet or preferably over the entire length of the reaction chamber 14, is replaced by a closed plate. Thus, a downward short-circuit current decreases.
Im oberen Bereich des Reaktionsraumes 14 werden Strömungswege des Prozessga- ses über Leitbleche definiert. Diese Leitbleche können an der Decke des weitgehend quaderförmigen Reaktionsraumes 14 angebracht werden. Dadurch wird das Prozessgas umgelenkt, wodurch sich seine Verweilzeit, bezogen auf eine auf den Transportkästen lagernde Charge, erhöht, und ein ungenutzter Kurzschlussstrom vermindert wird.
Bevorzugt werden Leitbleche auf der Oberseite der Transportkästen angeordnet, wodurch die Höhe der darauf gelagerten, zu entbindernden Formkörper variiert werden kann.In the upper region of the reaction space 14, flow paths of the process gas are defined by baffles. These baffles can be attached to the ceiling of the largely cuboid reaction chamber 14. As a result, the process gas is deflected, which increases its residence time, based on a stored on the transport boxes batch, and an unused short-circuit current is reduced. Preferably baffles are arranged on top of the transport boxes, whereby the height of the stored thereon, to be debinded moldings can be varied.
Zur Verringerung des freien Strömungsquerschnitts in dem Entbinderungsofen 12 und somit zur Reduzierung eines ungenutzten Kurzschlussstroms werden im unteren Bereich des Entbinderungsofens 12, in dem das Transportband geführt wird, Leitbleche vorgesehen, die einen nach oben gerichteten Strömungsweg des Prozessgases erzwingen.To reduce the free flow cross-section in the binder removal furnace 12 and thus to reduce an unused short-circuit current baffles are provided in the lower part of the binder removal furnace 12, in which the conveyor belt is guided, which force an upward flow path of the process gas.
Um einen gleichförmigen und möglichst schnellen Entbinderungsprozess zu erzielen, ist eine homogene Temperaturverteilung innerhalb des Reaktionsraumes 14 und insbesondere bezogen auf die Formkörper notwendig. Die durch die Depolymerisations- reaktion des Matrixmaterials entstehenden Reaktionsprodukte, die sich in der Umge- bung der Formkörper konzentrieren, führen zu einer gewissen Beeinträchtigung des Entbinderungsprozesses und müssen demnach gleichmäßig abgeführt werden. Somit besteht eine Notwendigkeit für eine gleichmäßige Verteilung und Verwirbelung des Prozessgases im Reaktionsraum 14 derart, dass sämtliche Formkörper im Wesentlichen identischen Reaktionsbedingungen unterliegen. Erfindungsgemäß werden eine oder mehrere Umwälzeinrichtungen, beispielsweise Gebläse oder Ventilatoren an einer Seitenwand des Entbinderungsofens 12 und bevorzugt im Wechsel an zwei einander gegenüberliegenden Seitenwänden des Entbinderungsofens 12 vorgesehen. Hierdurch wird nicht nur eine einheitliche Prozessatmosphäre erzielt, sondern auch eine erfindungsgemäße Queranströmung der zu entbindernden Formkörper.In order to achieve a uniform and as fast as possible debinding process, a homogeneous temperature distribution within the reaction space 14 and in particular based on the moldings is necessary. The reaction products resulting from the depolymerization reaction of the matrix material, which concentrate in the environment of the shaped bodies, lead to a certain impairment of the debindering process and accordingly have to be removed uniformly. Thus, there is a need for a uniform distribution and turbulence of the process gas in the reaction space 14 such that all moldings are subjected to substantially identical reaction conditions. According to the invention, one or more circulation devices, for example blowers or fans, are provided on a side wall of the binder removal furnace 12 and preferably alternately on two opposite side walls of the binder removal furnace 12. As a result, not only a uniform process atmosphere is achieved, but also an inventive transverse flow of the moldings to be entbindernden.
Insbesondere begünstigen ein oder mehrere Einleitungsstellen des Prozessgases, die unter strömungstechnischen Gesichtspunkten an dem Entbinderungsofen vorgesehen sind, eine angestrebte Verwirbelung des Prozessgases und/oder eine vorteilhafte Queranströmung der zu entbindernden Formkörper. Erfindungsgemäß kann das Ein- düsen des Prozessgases von oben mit hoher Geschwindigkeit in den Reaktionsraum 14 des Entbinderungsofens 12, bevorzugt zwischen aufeinander folgenden Transportkästen, zu einer Verwirbelung des Prozessgases und somit zu einer Homogenisierung der Prozessatmosphäre beitragen.In particular, one or more points of introduction of the process gas, which are provided under fluidic aspects of the binder removal furnace, favor a desired turbulence of the process gas and / or an advantageous transverse flow of the moldings to be debinded. According to the invention, injecting the process gas from above at high speed into the reaction space 14 of the binder removal furnace 12, preferably between successive transport boxes, can contribute to a turbulence of the process gas and thus to a homogenization of the process atmosphere.
Insbesondere kann die Queranströmung erreicht werden, durch eine erfindungsgemäße seitliche Einleitung des Prozessgases in den Entbinderungsofen 12. Die Einleitung kann in Bereichen oder bevorzugt gleichmäßig verteilt entlang der gesamten Länge des Entbinderungsofens 12 erfolgen. Die Einleitung kann entlang einer Seite des Entbinderungsofens 12, bevorzugt an zwei einander gegenüberliegenden Seiten des Ent- binderungsofens 12 vorgesehen sein, wobei die Einleitung an zwei einander gegenü-
berliegenden Seiten des Entbinderungsofens 12 vorzugsweise wechselseitig erfolgt. Die Einleitung kann über Schlitze, Bohrungen oder Düsen in den Seitenwänden des Entbinderungsofens 12 erfolgen.In particular, the transverse flow can be achieved by a lateral introduction of the process gas into the binder removal furnace 12 according to the invention. The introduction can take place in regions or preferably evenly distributed along the entire length of the binder removal furnace 12. The introduction may be provided along one side of the debinder oven 12, preferably on two opposite sides of the debinder oven 12, the initiation being opposed to two opposite one another. Overlying sides of the binder removal furnace 12 preferably takes place alternately. The introduction can be made via slots, holes or nozzles in the side walls of the binder removal furnace 12.
Insbesondere vorteilhaft ist eine seitliche Einleitung des Prozessgases an zwei einander gegenüberliegenden Seitenwänden des Entbinderungsofens 12 mit im Wechsel zueinander angeordneten Einleitungsstellen, die an der jeweils gegenüberliegenden Seitenwand des Entbinderungsofens 12 durch Umwälzeinrichtungen ergänzt werden. Die somit erzielte Durchmischung des Innenraumes des Reaktionsraumes 14 und der erfindungsgemäßen Queranströmung führen zu einer homogenen Temperatur- und Prozessgasverteilung unter gleichzeitig beschleunigter Abführung von Reaktionsprodukten aus der Umgebung der zu entbindernden Formkörper. Somit werden die Voraussetzungen für einen gleichmäßigen und beschleunigten Entbinderungsprozess geschaffen.Particularly advantageous is a lateral introduction of the process gas at two opposite side walls of the binder removal furnace 12 with mutually arranged discharge points, which are supplemented at the respective opposite side wall of the binder removal furnace 12 by circulating means. The thus achieved thorough mixing of the interior of the reaction chamber 14 and the transverse flow according to the invention lead to a homogeneous temperature and process gas distribution while accelerated removal of reaction products from the environment of the moldings to be entbindernden. This will create the conditions for a steady and accelerated process of exemption.
In der erfindungsgemäßen Vorrichtung zum kontinuierlichen katalytischen Entbindem von Formkörpern führen die eingesetzten Einbauten und Einrichtungen zu einer homogenen Durchmischung des Innenraums und einem weitgehend quer zur Transportrichtung verlaufenden Strömungsweg des Prozessgases. Damit wird eine gleichmäßige Verteilung der Temperatur und des Reaktionspartners, sowie eine Abführung von Reaktionsprodukten aus der Umgebung der Formkörper erreicht, wodurch eine Prozessatmosphäre geschaffen wird, die zu einem effizienten und im gleichen Maße verkürzten Entbinderungsschritt bei gleich bleibend hoher Qualität der Entbinderung führt. Insbesondere die erfindungsgemäße seitliche Einleitung des Prozessgases resultiert in einer maximierten Ausnutzung der eingesetzten Prozessstoffe.
In the apparatus according to the invention for the continuous catalytic debinding of moldings, the internals and devices used result in a homogeneous mixing of the interior space and a flow path of the process gas which extends largely transversely to the transport direction. This achieves a uniform distribution of the temperature and of the reactant as well as a removal of reaction products from the surroundings of the moldings, thereby creating a process atmosphere which leads to an efficient and to the same extent shortened debindering step while maintaining the same high quality of debindering. In particular, the lateral introduction of the process gas according to the invention results in a maximized utilization of the process substances used.
Claims
1. Vorrichtung zum kontinuierlichen katalytischen Entbindem von durch Pulver- Spritzgussverfahren hergestellte metallische und/oder keramische Formkörper, aufweisend einen Entbinderungsofen, den die Formkörper in einer Transportrichtung durchlaufen, wobei sie auf eine geeignete Prozesstemperatur gebracht werden, eine Fördereinrichtung für das Einleiten eines für die Entbinderung erforderlichen Prozessgases, welches einen Reaktionspartner beinhaltet, mindestens eine Einrichtung zum Einleiten eines Schutzgases in einen Reaktionsraum des Entbinderungsofens und eine Fackel, um die bei der Entbinderung anfallenden gasförmigen Reaktionsprodukte zu verbrennen, dadurch gekennzeichnet, dass eine oder mehrere Einrichtungen vorhanden sind, die zu einer gezielt quer zur Transportrichtung gerichteten Strömung des Prozessgases in der Vorrichtung führen.An apparatus for the continuous catalytic debinding of metallic and / or ceramic shaped bodies produced by powder injection molding, comprising a debinding furnace, which the shaped bodies pass through in a transporting direction, being brought to an appropriate process temperature, a conveyor for introducing one for debinding required process gas, which includes a reactant, at least one means for introducing a protective gas into a reaction space of the binder removal furnace and a torch to burn incurred in the debindering gaseous reaction products, characterized in that one or more facilities are present, the targeted lead transversely to the transport direction directed flow of the process gas in the device.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Formkörper durch den Entbinderungsofen mittels eines Transportbandes transportiert werden mit einer Hin- und Rückführung, die voneinander teilweise oder vollständig durch ein gasundurchlässiges Blech getrennt sind.2. Apparatus according to claim 1, characterized in that the shaped bodies are transported by the binder removal furnace by means of a conveyor belt with a forward and return, which are separated from each other partially or completely by a gas-impermeable sheet.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Entbin- derungs- ofen als Stossofen ausgebildet ist.3. Device according to claim 1 or 2, characterized in that the debindering oven is designed as a blast furnace.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Formkörper auf Transportkästen lagern, die einen gasdurchlässigen Boden und gasdurchlässige Seitenwände aufweisen, so dass eine weitgehend vertikal gerichtete Strömung des Prozessgases erzeugt wird.4. Device according to one of claims 1 to 3, characterized in that the shaped bodies store on transport boxes, which have a gas-permeable bottom and gas-permeable side walls, so that a largely vertically directed flow of the process gas is generated.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die eine oder die mehreren Einrichtungen Leitbleche derart umfassen, dass eine weitgehend vertikal gerichtete Strömung des Prozessgases erzeugt wird.5. Device according to one of claims 1 to 4, characterized in that the one or more means baffles include such that a largely vertically directed flow of the process gas is generated.
6. Vorrichtung nach einem der Ansprüchel bis 5, dadurch gekennzeichnet, dass die eine oder die mehreren Einrichtungen Umwälzeinrichtungen im Inneren des Ent- binderungsofens umfassen.6. Device according to one of claims 5 to 5, characterized in that the one or more devices comprise circulating means in the interior of the decapping furnace.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass mehrere Umwälzeinrichtungen im Wechsel zueinander, an einander gegenüberliegenden Wänden des Entbinderungsofens angeordnet sind. 7. Apparatus according to claim 6, characterized in that a plurality of circulating means are arranged in alternation to each other, on opposite walls of the binder removal furnace.
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Prozessgas in den Entbinderungsofen über mehrere Einleitungsstellen entlang der Transportrichtung eingebracht wird.8. Device according to one of claims 1 to 7, characterized in that the process gas is introduced into the binder removal furnace via a plurality of introduction points along the transport direction.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die mehreren Einleitungsstellen seitlich am Entbinderungsofen angeordnet sind.9. Apparatus according to claim 8, characterized in that the plurality of introduction points are arranged laterally on the binder removal furnace.
10. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die mehreren Ein- leitungsstellen im Wechsel zueinander, an einander gegenüberliegenden Wänden des Entbinderungsofens angeordnet sind.10. The device according to claim 8, characterized in that the plurality of introduction sites in alternation to each other, are arranged on opposite walls of the binder removal furnace.
11. Verfahren zum kontinuierlichen katalytischen Entbindem von durch Pulver- Spritzgussverfahren hergestellte metallische und/oder keramische Formkörper in einer Vorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Formkörper durch den Entbinderungsofen in einem Zeitintervall von 2 h bis 8 h transportiert werden, wobei sie auf eine Prozesstemperatur im Bereich von 100 °C bis 150°C gebracht werden und das eingebrachte Prozessgas verdampfte Salpetersäure als Reaktionspartner in einem Stickstoffgasstrom enthält. 11. A process for the continuous catalytic debinding of metallic and / or ceramic moldings produced by powder injection molding in a device according to one of claims 1 to 10, characterized in that the moldings are transported through the binder removal furnace in a time interval of 2 h to 8 h wherein they are brought to a process temperature in the range of 100 ° C to 150 ° C and the introduced process gas contains vaporized nitric acid as a reactant in a nitrogen gas stream.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005027216A DE102005027216A1 (en) | 2005-06-13 | 2005-06-13 | Apparatus and method for continuous catalytic debinding with improved flow conditions |
PCT/EP2006/062981 WO2006134054A2 (en) | 2005-06-13 | 2006-06-07 | Device and method for continuously and catalytically removing binder, with improved flow conditions |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1899095A2 true EP1899095A2 (en) | 2008-03-19 |
Family
ID=37199178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06763566A Withdrawn EP1899095A2 (en) | 2005-06-13 | 2006-06-07 | Device and method for continuously and catalytically removing binder, with improved flow conditions |
Country Status (11)
Country | Link |
---|---|
US (1) | US8235710B2 (en) |
EP (1) | EP1899095A2 (en) |
JP (1) | JP2009501842A (en) |
KR (1) | KR20080032092A (en) |
CN (1) | CN101198427B (en) |
BR (1) | BRPI0612135A2 (en) |
DE (1) | DE102005027216A1 (en) |
EA (1) | EA200702657A1 (en) |
MX (1) | MX2007015634A (en) |
TW (1) | TW200719991A (en) |
WO (1) | WO2006134054A2 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010149648A1 (en) | 2009-06-25 | 2010-12-29 | Basf Se | Method for the continuous thermal debinding of a thermoplastic molding compound |
GB0917988D0 (en) | 2009-10-14 | 2009-12-02 | Johnson Matthey Plc | Method |
US9362546B1 (en) | 2013-01-07 | 2016-06-07 | Quantumscape Corporation | Thin film lithium conducting powder material deposition from flux |
ES2890654T3 (en) | 2013-10-07 | 2022-01-21 | Quantumscape Battery Inc | Garnet Materials for Li Secondary Batteries and Manufacturing Methods and Use of the Garnet Materials |
WO2016168723A1 (en) | 2015-04-16 | 2016-10-20 | Quantumscape Corporation | Setter plates for solid electrolyte fabrication and methods of using the same to prepare dense solid electrolytes |
US9966630B2 (en) | 2016-01-27 | 2018-05-08 | Quantumscape Corporation | Annealed garnet electrolyte separators |
WO2018075809A1 (en) | 2016-10-21 | 2018-04-26 | Quantumscape Corporation | Lithium-stuffed garnet electrolytes with a reduced surface defect density and methods of making and using the same |
US11489193B2 (en) | 2017-06-23 | 2022-11-01 | Quantumscape Battery, Inc. | Lithium-stuffed garnet electrolytes with secondary phase inclusions |
US11600850B2 (en) | 2017-11-06 | 2023-03-07 | Quantumscape Battery, Inc. | Lithium-stuffed garnet thin films and pellets having an oxyfluorinated and/or fluorinated surface and methods of making and using the thin films and pellets |
CN112665375A (en) * | 2019-10-15 | 2021-04-16 | 米巴精密零部件(中国)有限公司 | Sintering furnace |
WO2023021196A1 (en) | 2021-08-19 | 2023-02-23 | Headmade Materials Gmbh | Binder component for a particulate feedstock compound for use in a shaping and sintering process, particulate feedstock compound, and shaping and sintering process |
CN117897247A (en) | 2021-08-19 | 2024-04-16 | 海德梅德材料有限公司 | Granular feedstock compound for powder bed additive manufacturing process and forming and sintering process |
CA3228949A1 (en) | 2021-08-19 | 2023-02-23 | Headmade Materials Gmbh | Binder component for a feedstock compound for use in a shaping and sintering process, particulate feedstock compound, and shaping and sintering process |
WO2023021202A1 (en) | 2021-08-19 | 2023-02-23 | Headmade Materials Gmbh | Processes for producing a sintered part |
WO2023111037A1 (en) | 2021-12-14 | 2023-06-22 | Headmade Materials Gmbh | Process for the manufacture of an element having porous portions and sintered element having non-uniform porosity |
CN114838581B (en) * | 2022-04-21 | 2024-02-27 | 广州市蓝炬能源科技有限公司 | Catalytic combustion heating and drying process for household ceramic products |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE879112C (en) | 1951-04-28 | 1953-06-11 | Licentia Gmbh | Kiln and annealing furnace with belt conveyor |
JPS58107171U (en) * | 1982-01-11 | 1983-07-21 | 山崎電機工業株式会社 | Continuous thick film firing furnace |
JPH0235232B2 (en) * | 1987-01-20 | 1990-08-09 | Chugai Ro Kogyo Kaisha Ltd | RENZOKUSHIKIROORAHAASUGATASHOSEIRO |
JPH0616890Y2 (en) * | 1987-06-09 | 1994-05-02 | 本田技研工業株式会社 | Sintering furnace |
JPH0623554Y2 (en) * | 1988-12-01 | 1994-06-22 | マツダ株式会社 | Workpiece heat treatment equipment |
JPH0428995A (en) * | 1990-05-24 | 1992-01-31 | Fujitsu Ltd | Baking apparatus for manufacturing ceramic board |
US5069380A (en) * | 1990-06-13 | 1991-12-03 | Carlos Deambrosio | Inerted IR soldering system |
US5345061A (en) * | 1992-09-15 | 1994-09-06 | Vitronics Corporation | Convection/infrared solder reflow apparatus utilizing controlled gas flow |
JPH06122903A (en) | 1992-10-09 | 1994-05-06 | Kitagawa Iron Works Co Ltd | Method for degreasing metal powder compact |
JP2602769B2 (en) * | 1993-04-22 | 1997-04-23 | 東洋機械金属株式会社 | High-speed chemical degreasing furnace |
CA2133387A1 (en) * | 1993-10-01 | 1995-04-02 | Basf K&F Corporation | Process for improving the debinding rate of ceramic and metal injection molded products |
CN1042927C (en) * | 1994-01-07 | 1999-04-14 | 清华大学 | Ceramic injection forming body fast defat method and its apparatus |
JPH07239186A (en) * | 1994-02-28 | 1995-09-12 | Shimadzu Corp | Degreasing sintering furnace |
CN1085192C (en) * | 1995-11-08 | 2002-05-22 | 松下电器产业株式会社 | Ceramic die mould degreasing method and device thereof |
DE19719203C2 (en) | 1996-05-10 | 2000-05-11 | Eisenmann Kg Maschbau | Sintering process for made of metal powder, in particular of multicomponent systems based on iron powder, pressed molded parts and sintering furnace suitable for carrying out the process |
US5970308A (en) * | 1998-08-07 | 1999-10-19 | Air Products And Chemicals, Inc. | Method for de-lubricating powder metal compacts |
ATE293176T1 (en) | 1999-03-02 | 2005-04-15 | Csir | ENDOTHERMAL HEAT TREATMENT OF SOLID BODY ON TRUCKS IN A TUNNEL FURNACE |
US6283748B1 (en) * | 1999-06-17 | 2001-09-04 | Btu International, Inc. | Continuous pusher furnace having traveling gas barrier |
EP1184637A1 (en) * | 2000-08-28 | 2002-03-06 | Mino Yogyo Co., Ltd. | Firing setters and process for producing these setters |
DE10151358A1 (en) | 2001-10-22 | 2003-04-30 | Gero Hochtemperaturoefen Gmbh | Procedure for controlling the debinding process for MIM or CIM parts |
US6936793B1 (en) * | 2002-04-17 | 2005-08-30 | Novastar Technologiesm Inc. | Oven apparatus and method of use thereof |
US6780225B2 (en) * | 2002-05-24 | 2004-08-24 | Vitronics Soltec, Inc. | Reflow oven gas management system and method |
JP4357886B2 (en) * | 2003-06-30 | 2009-11-04 | Tdk株式会社 | Debinding tool and electronic component manufacturing method |
-
2005
- 2005-06-13 DE DE102005027216A patent/DE102005027216A1/en not_active Withdrawn
-
2006
- 2006-06-07 KR KR1020087000911A patent/KR20080032092A/en not_active Application Discontinuation
- 2006-06-07 EA EA200702657A patent/EA200702657A1/en unknown
- 2006-06-07 JP JP2008516284A patent/JP2009501842A/en active Pending
- 2006-06-07 WO PCT/EP2006/062981 patent/WO2006134054A2/en active Application Filing
- 2006-06-07 MX MX2007015634A patent/MX2007015634A/en active IP Right Grant
- 2006-06-07 US US11/917,279 patent/US8235710B2/en not_active Expired - Fee Related
- 2006-06-07 BR BRPI0612135-7A patent/BRPI0612135A2/en not_active IP Right Cessation
- 2006-06-07 EP EP06763566A patent/EP1899095A2/en not_active Withdrawn
- 2006-06-07 CN CN2006800211059A patent/CN101198427B/en not_active Expired - Fee Related
- 2006-06-12 TW TW095120856A patent/TW200719991A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2006134054A2 * |
Also Published As
Publication number | Publication date |
---|---|
EA200702657A1 (en) | 2008-06-30 |
CN101198427B (en) | 2010-06-16 |
DE102005027216A1 (en) | 2006-12-21 |
TW200719991A (en) | 2007-06-01 |
WO2006134054A3 (en) | 2007-03-08 |
US20080199822A1 (en) | 2008-08-21 |
BRPI0612135A2 (en) | 2011-01-04 |
CN101198427A (en) | 2008-06-11 |
KR20080032092A (en) | 2008-04-14 |
JP2009501842A (en) | 2009-01-22 |
US8235710B2 (en) | 2012-08-07 |
MX2007015634A (en) | 2008-02-15 |
WO2006134054A2 (en) | 2006-12-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006134054A2 (en) | Device and method for continuously and catalytically removing binder, with improved flow conditions | |
EP1829843B1 (en) | Device for treating pieces of porous carbon material | |
DE3232525C2 (en) | Heating chamber for systems for sintering and hot isostatic pressing of compacts made of powder | |
JP2009501842A5 (en) | ||
DE69613998T2 (en) | METHOD AND DEVICE FOR HOT ISOSTATIC PRESSING OF PARTS | |
EP4415000A2 (en) | Method for producing graphite and vertical graphitization furnace | |
DE69833966T2 (en) | PROCESS FOR BURNING CERAMIC WAVE BODY IN A TUNNEL OVEN | |
EP3016766A2 (en) | Method for sintering workpieces to be sintered, and system for this purpose | |
DE102008058330A1 (en) | Method for tempering a hot isostatic press and a hot isostatic press | |
EP2717008A2 (en) | Gas-tight industrial furnace supplied with protecting gas, in particular chamber furnace, pusher type furnace or ring hearth furnace | |
EP2445670B1 (en) | Method for the continuous thermal debinding of a thermoplastic molding compound | |
DE3215140C2 (en) | Method and device for the production of unfired ferrous pellets | |
DE3627941A1 (en) | HEAT TREATMENT DEVICE WITH FLUID BED | |
EP2439289A1 (en) | Method and oven for treating workpieces | |
DE102005022242B4 (en) | Plant for debinding / residual removal and sintering | |
EP2546009A2 (en) | Method and device for debinding and sintering powder metallurgically produced products | |
EP1898170A2 (en) | Device for physical and/or chemical treatment of parts | |
AT523094B1 (en) | sinter furnace | |
DE3233361C2 (en) | Continuously operating electric furnace for heat treatment of steel objects | |
DE102011050264A1 (en) | Apparatus for fumigating porous casting cores in core molding box, has heating device that is provided in aeration hood for heating of gas | |
WO2002000377A1 (en) | Method and device for sintering aluminium based sintered parts | |
DE1583478A1 (en) | Process and furnace for continuous heat treatment | |
EP3864202A1 (en) | Method and device for stabilizing precursor fibers or films for producing carbon fibers or films | |
EP2815822A2 (en) | Method and installation for debinding and sintering of parts | |
EP2310784B1 (en) | Shaft furnace and method for heat treating carbonaceous castings |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20071212 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
DAX | Request for extension of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20161110 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20170321 |