EP3016766A2 - Procede de frittage de pieces a fritter et installation correspondante - Google Patents

Procede de frittage de pieces a fritter et installation correspondante

Info

Publication number
EP3016766A2
EP3016766A2 EP14761279.0A EP14761279A EP3016766A2 EP 3016766 A2 EP3016766 A2 EP 3016766A2 EP 14761279 A EP14761279 A EP 14761279A EP 3016766 A2 EP3016766 A2 EP 3016766A2
Authority
EP
European Patent Office
Prior art keywords
sintering
sintered
debinding
chamber
atmosphere
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Withdrawn
Application number
EP14761279.0A
Other languages
German (de)
English (en)
Inventor
Axel WEIAND
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Onejoon GmbH
Original Assignee
Eisenmann SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eisenmann SE filed Critical Eisenmann SE
Publication of EP3016766A2 publication Critical patent/EP3016766A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
    • C04B37/001—Joining burned ceramic articles with other burned ceramic articles or other articles by heating directly with other burned ceramic articles
    • 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
    • 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
    • B22F3/1028—Controlled cooling
    • 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
    • C04B35/64—Burning or sintering processes
    • 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
    • C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
    • C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
    • C04B37/021—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles in a direct manner, e.g. direct copper bonding [DCB]
    • 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
    • F27B9/029—Multicellular type furnaces constructed with add-on modules
    • 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
    • F27B9/045—Furnaces with controlled atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/658—Atmosphere during thermal treatment
    • C04B2235/6583—Oxygen containing atmosphere, e.g. with changing oxygen pressures
    • C04B2235/6584—Oxygen containing atmosphere, e.g. with changing oxygen pressures at an oxygen percentage below that of air
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/32—Ceramic
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/40—Metallic
    • C04B2237/402—Aluminium

Definitions

  • the invention relates to a method for sintering sintered workpieces, in which the following steps are carried out: a) the sintered workpieces are debindered in an oxygen-liberated or at least oxygen-reduced inert gas atmosphere, whereby a binder removal atmosphere is produced, which is loaded with binding aids which release from the sintered workpiece during debindering become; b) the sintered workpieces are brought to sintering temperature, whereby a sintered exhaust gas is produced; c) the sintered workpieces are cooled in a controlled manner.
  • the invention relates to a plant for sintering sintered workpieces, with a) a binder removal area in which the sintered workpieces are debindered in an oxygen-depleted or at least oxygen-reduced inert gas atmosphere, whereby a binder removal atmosphere is produced, which is loaded with binding aids which are released from the sintered workpieces during debindering ; b) an inert gas device, by means of which the inert gas atmosphere is generated and passed into the binder removal area; c) a sintering region, in which the sintered workpieces are brought to sintering temperature after debindering, wherein
  • CONFIRMATION COPY a sintered exhaust gas is produced; d) a cooling zone in which the sintered workpieces are cooled in a controlled manner after sintering.
  • binding aids When pressing the sintered workpieces binding aids are needed, which must be completely removed before the actual sintering process again.
  • debindering of the sintered workpieces is accomplished by heating the sintered workpieces to a temperature at which the binding adjuvants are released from and removed from the sintered workpieces. Exothermic and endothermic reactions occur under normal atmosphere in the interior of the sintered workpieces, which result in high local temperature differences in the structure of the sintered workpieces, which in turn can damage the sintered workpieces or considerably reduce the quality of the final sintered product.
  • debinding is in some cases carried out in an oxygen-free or at least oxygen-reduced inert gas atmosphere.
  • residual acid levels of up to 20% by volume may still be acceptable.
  • the residual oxygen content is at most 15% by volume, more preferably at most 10% by volume, and most preferably at most 5% by volume.
  • the inert gas atmosphere can be formed, for example, by an appropriate addition of nitrogen. Alternatively, the inert gas can also be formed, in the oxygen is removed from a basic atmosphere by burning.
  • a method of the type mentioned can be carried out in continuous sintering furnaces, in which the sintered workpieces are continuously passed through a debinder, a sintering and a cooling section, which are arranged sequentially and without spatial separation of the atmosphere.
  • a debinder for example, a sintering furnace
  • a cooling section which are arranged sequentially and without spatial separation of the atmosphere.
  • the respective required temperature profile and in particular the at least required temperature are different from one another for the debindering process and the sintering process.
  • the temperatures during sintering are considerably higher than during debindering; so the sintering temperature may well be 1000 ° C and more above the temperature for the binder removal;
  • the required sintering temperatures can usually only be achieved with the help of gas burners.
  • a particularly uniform temperature distribution is desirable for debinding.
  • the uniform temperature distribution desirable for debinding can be achieved particularly well in recirculating air mode.
  • the components to be provided for this purpose are generally not equal to the temperatures then occurring in the sintering process.
  • the single chamber must be repeatedly heated to the higher temperatures for the debindering process and then to the high temperatures for the sintering process, for cooling. Let cool again and then reheat for the next cycle. That requires relatively much energy.
  • This object is achieved in a method of the aforementioned type in that d) the sintered workpieces are debinded in a separate binder chamber and sintered in a separate sintering chamber.
  • the debinding and the sintering and the respectively present atmospheres can be spatially separated from one another.
  • the temperature profile for the sintered workpieces can be adapted particularly well to the requirements of the sintered workpiece for the respective debinding and sintering process.
  • the binder removal and the sintering chamber can also be adapted to each other so that the residence time of the sintered workpieces in the two chambers is the same length, so that a quasi-continuous flow of the process can be achieved.
  • the sintering chamber can be operated independently of the debindering chamber and follow a different furnace concept.
  • the sintering chamber can be operated as a muffle furnace.
  • the binder removal chamber can be operated in recirculation mode.
  • the required uniform temperature distribution for the debindering process can be achieved particularly effectively.
  • continuously operated continuous sintering furnaces for example, it is very difficult to design the plant as a recirculation system, since the high temperatures required for the sintering process are difficult to achieve in recirculation mode.
  • the length of the individual chambers can be kept small if the sintered workpieces are conveyed intermittently through the binder removal chamber and the sintering chamber.
  • the exhaust gas which is obtained in this thermal afterburning a gas with such a low oxygen content and with respect to the debinding so inert properties available that this exhaust gas can be used as an inert gas atmosphere for the debinding process. At least the exhaust gas can contribute to the inert gas atmosphere. > is then generated, for example, that a fresh inert gas such as nitrogen, the exhaust gas from the ther mix afterburner is admixed. So at least the proportion of fresh inert gas can be reduced, which also improves the energy balance of the plant.
  • the sintered exhaust gas is also used to generate the inert gas atmosphere.
  • the sintering gas which is produced in the sintering process also has a property by virtue of which it can be used to produce the inert gas atmosphere for debindering.
  • the sintering process is always carried out in its own inert gas atmosphere. This inert gas can thus be reused for the binder removal and thus be used twice.
  • the sintered exhaust gas together with the debinding atmosphere in the thermal afterburner may be burned to exhaust gas thereof; This is especially true if the oxygen content of the sintering exhaust gas is above the allowed threshold value for the inert gas atmosphere.
  • the sintering exhaust gas can be mixed with the exhaust gas of the thermal Incinerator are mixed; This is especially true if the oxygen content of the sintering exhaust gas is below the allowed threshold value for the inert gas atmosphere.
  • the sintering waste gas is so pure that there are no substances or compounds which disturb the debindering process.
  • the heat energy of the sintering waste gas can already be used effectively, as this can additionally heat the exhaust gas of the thermal afterburning device and thus contribute to the generation and maintenance of the temperature required in the binder removal chamber.
  • the sintered exhaust gas is discharged for this purpose via one or more outlet openings from the sintering chamber.
  • the binder removal atmosphere, the sintered exhaust gas and / or the exhaust gas obtained from the thermal afterburning device can be additionally conditioned.
  • an adjustment of the temperature and of the residual oxygen content can take place.
  • the binder removal chamber is used as a is formed air chamber.
  • the sintering chamber may be formed, for example, as a muffle furnace.
  • the sintered workpieces can be conveyed by means of a conveyor system intermittently through the debindering chamber and the sintering chamber.
  • the inert gas device comprises a thermal post-combustion device, which Entbind mecanicsatmospreheat can be supplied via a line and in which
  • an exhaust gas is obtained, which is usable for the generation of the inert gas atmosphere or as an inert gas atmosphere for the binder removal.
  • the sintering waste gas is advantageous for the sintering waste gas to be conductible via an outlet line to the thermal afterburning device, where it can be burned to its exhaust gas together with the binder removal atmosphere; or b) the sintering waste gas can be conducted via an outlet line to the exhaust gas of the thermal afterburning device and mixable with it.
  • Figure 1 is a vertical longitudinal section of a plant for sintering sintered workpieces
  • FIGS. 2A and 2B show a vertical cross-section next to each other. cut a binder removal chamber and a sintering chamber of the sintering plant;
  • FIG. 3 shows a temperature profile in the sintering process of the sinter
  • FIG. 1 denoted by 10 as a whole is a sintering plant, which comprises an inlet region 12, a debinding region 14, a sintering region 16, a cooling region 18 and an outlet region 20.
  • Sintered workpieces 22 are sintered in the sintering plant 10, which are conveyed to the output area 20 by means of a conveyor system 24 on trolleys 26 from the entrance area 12 through the individual areas 14, 16 and 18 for debinding, sintering and cooling.
  • a conveyor system 24 on trolleys 26 from the entrance area 12 through the individual areas 14, 16 and 18 for debinding, sintering and cooling.
  • only some of the sintered work pieces 22 and the trolley 26 are provided with reference numerals.
  • the sintering plant 10 comprises, for the individual process stages debindering, sintering and cooling, in each case a separate debindering chamber 28, a sintering chamber 30 and a cooling chamber 32 each having a chamber inlet 28a, 30a or 32a and a chamber outlet 28b, 30b and 32b, respectively present embodiment are intermittently traversed by the sintered workpieces 22.
  • a movable intermediate bulkhead 34 is respectively arranged, by which the respective atmospheres kept separate and the associated temperature ranges can be isolated from each other, so that the binder area 14, the sintering area 16 and the cooling area 18 and the therein be ⁇ sensitive atmospheres are spatially separated from each other can.
  • the individual steps debindering, sintering and cooling are thus carried out in separate atmospheres in spatially separated areas.
  • the intermediate bulkhead 34 can be moved between a corresponding closed position and a release position, wherein in the release position, a respective passage for the sintered workpieces 22 of the binder removal chamber 28 in the sintering chamber 30 and of the sintering chamber 30 is provided in the cooling chamber 32.
  • a correspondingly movable input bulkhead 36 is arranged, while the chamber outlet 32b of the cooling chamber 32 can be closed or opened by a comparable output bulkhead 38.
  • the binder removal chamber 28 is designed as a recirculating air chamber and operates in recirculation mode; For this purpose, it comprises an outer flow space 40 which can easily be seen in FIG. 2 and which surrounds an inner debindering space 42, into which the flow space 40 opens via inlet openings 44 near the bottom.
  • the binder removal chamber 42 is supplied with an oxygen-depleted or at least oxygen-reduced inert gas atmosphere, in order to prevent the damage caused by oxygen during debindering.
  • the sintering plant 10 comprises an inert gas device 46, by means of which an inert gas atmosphere which is suitable for the binder removal process or at least oxygen-reduced inert gas atmosphere is generated, conditioned and supplied to the binder removal space 42.
  • the inert gas device 46 in turn comprises a thermal see post-combustion device 48, in which the binding aids are burned, which are released from the sintered workpieces 22 during the debinding process.
  • the atmosphere thus formed during the debindering process and loaded with binder assistants is referred to herein as the debinding atmosphere.
  • exhaust gas is obtained which, if appropriate after further conditioning, such as, for example, a temperature adjustment, can be used for generating the inert gas atmosphere for the binder removal chamber 28 or used as such in its entirety.
  • the debindering space 42 has a permeable ceiling 50 which leads to a suction space 52 which is arranged between the debindering space 42 and the flow space 40.
  • the suction chamber 52 in turn leads back to the flow space 40, which is connected via a line 54 with the thermal afterburning device 48, so that debindering atmosphere can flow from the flow space 40 to the thermal afterburning device 48.
  • Their optionally additionally conditioned exhaust gases are then passed at least partially as an inert gas atmosphere through a supply line 56 into the suction chamber 52.
  • a blower 58 is additionally arranged in the upper region of the flow space 40.
  • This blower 58 sucks in atmosphere from the suction space 52 via an intake pipe 58a.
  • this atmosphere comprises the binder removal atmosphere, which comes from the binder removal chamber 42 and is loaded with binding aids, and, on the other hand, the inert gas atmosphere, which is conducted by the thermal afterburner 48 into the suction chamber 52.
  • the fan 58 conveys a portion of the atmosphere in the flow space 40 to the inlet openings 44 and via this into the debindering space 42, where this atmosphere flows through the debinder space 42 from bottom to top, thereby taking up binding agents released from the sintered workpieces 22.
  • the remaining portion of the atmosphere in the flow space 40, and thus also Entbind ceremoniessatmospreheat from the binder removal space 42 is discharged through the fan 58 via line 54 to the thermal afterburner 48.
  • the sintering chamber 30 of the sintering plant 10 in the present embodiment comprises a furnace chamber 62 with heat-insulating walls 64, which are brought by means of a burner system 66 with a plurality of burners 68 to temperature and maintained, so that the sintered workpieces 22 largely by radiant heat and by convection on the required temperature for the sintering process to be heated.
  • the burners 68 in the present exemplary embodiment heat the space above and below the sintered workpieces 22 by open flames and are arranged along the sintering chamber 30 at a height level above and below the sintered workpieces 22 for this purpose.
  • sintered waste gases are produced which are conveyed via a plurality of outlet openings 70 in the ceiling of the sintering chamber 30 via an outlet line 72 for generating the inert gas.
  • Mosptude for the binder chamber 28 are derived.
  • the sintering waste gases are conducted to the thermal afterburning device 48 where they are burned together with the atmosphere from the binder removal chamber 28 to the inert gas atmosphere for the debindering space 42.
  • the sintering waste gases from the sintering process can contribute as such to the inert gas atmosphere for the debindering space 42, without the sintering waste gases still having to be burned or otherwise conditioned for this purpose.
  • the outlet line 72 can also open directly into the flow space 40 or into the supply line 56, where the sintering waste gases from the sintering chamber 30 can mix with the waste gases from the thermal afterburning device 48 to the inert gas atmosphere for the debindering space 42. This is indicated in FIGS. 1 and 2 by a dashed course of the outlet line 72.
  • the design of the cooling region 18 with the cooling chamber 32 is known per se.
  • the temperature is adjusted there so that there is no or only a small temperature difference between the atmospheres in the sintering chamber 30 and the cooling chamber 32. On the one hand, this prevents the sintered workpieces 22 from being quenched and, on the other hand, prevents the furnace chamber 62 from cooling down from the cooling chamber 32 of the sintering chamber 30 due to the incoming atmosphere.
  • the sintering plant 10 works together as follows:
  • the sintered workpieces 22 are placed in the input region 12 on the trolleys 26 of the conveyor system 24 and retracted through the input bulkhead 36 into the binder removal chamber 28. With the help of the local and correspondingly conditioned inert gas atmosphere, the temperature required for the binder removal is generated and binding auxiliaries are expelled from the sintered workpiece 22.
  • the sintered workpieces 22 remain in the binder removal chamber 28 for a period ti, which is characterized in a temperature profile 74 shown in FIG. 3, which illustrates the temperature profile of the sintered workpiece pieces 22 during the passage through the sintering plant 10.
  • a temperature profile 74 shown in FIG. 3 which illustrates the temperature profile of the sintered workpiece pieces 22 during the passage through the sintering plant 10.
  • the temperature of the sintered workpiece 22 increases to a temperature Ti, which is about 500 ° C in the present embodiment.
  • the circulating operation of the binder removal chamber 28 results in a uniform temperature exchange, which ensures a good temperature distribution in the sintered workpiece 22 and thereby effective debindering.
  • the sintered workpieces 22 are transferred from the binder removal chamber 28 with the intermediate bulkhead 34 open to the sintering chamber 30 and brought there to the temperatures necessary for the sintering process.
  • the sintered workpieces 22 remain in the sintering chamber 30 for a period of time t 2 and are first heated to their required sintering temperature T 2 at which they are held for a certain period of time t 3 and then cooled in the sintering chamber 30 to a lower T 3 again ,
  • the time period t 3 is less than t 2 and may, for example, be less than one third of t 2 .
  • the temperatures ⁇ and T 3 at the beginning and at the end of the sintering process are the same large. Specifically, the temperatures ⁇ and T 3 in the present embodiment at 500 ° C, while the maximum sintering temperature T 2 is about 1550 ° C. However, ⁇ and T 3 may differ.
  • the respective temperatures T x , T 2 and T 3 and the periods ti, t 2 and t 3 depend in practice on the nature and properties of the sintered workpieces 22 and may vary accordingly.
  • the sintered workpieces 22 are conveyed through the intermediate bulkhead 34 into the cooling chamber 32, where the finished sintered parts 22 cool in a controlled manner. Then the cooled sintered workpieces 22 pass out of the sintering plant 10 via the exit bulkhead 38 and are removed by the conveyor system 24 or transported away to another location.
  • Suitable measures or designs minimize temperature and / or atmosphere mixing during transition from one chamber to the other.
  • conventional lock devices can be provided.
  • the temperatures and temperature profiles for the two debindering and sintering processes can be coordinated so that the sintered workpieces 22 each have to remain equally long in the debindering chamber 28 and the sintering chamber 30 and the periods ti and t 2 are the same size, so that a quasi-continuous throughput of the sintered workpieces 22 through the sintering plant 10 is possible.
  • the individual chambers 28, 30 and 32 are arranged directly one behind the other.
  • the chambers 28, 30, 32 can also be positioned next to each other.
  • a corresponding transverse conveying takes place through the conveyor system 24 and, if appropriate, lock devices must be provided in order to ensure an atmospheric separation, if necessary.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Tunnel Furnaces (AREA)
  • Powder Metallurgy (AREA)

Abstract

Procédé de frittage de pièces, selon lequel les pièces à fritter (22) sont déliantées dans une atmosphère de gaz inerte dépourvue d'oxygène ou du moins pauvre en oxygène, l'atmosphère de déliantage ainsi créée étant chargée en auxiliaires liants qui sont libérés des pièces à fritter (22) lors du déliantage. Les pièces à fritter (22) sont portées à une température de frittage (T2), ce qui produit un effluent gazeux de frittage, et elles sont refroidies de manière contrôlée. Les pièces à fritter (22) sont déliantées dans une chambre de déliantage (28) séparée et elles sont frittées dans une chambre de frittage (30) séparée. L'invention concerne en outre une installation de frittage de pièces à fritter (22).
EP14761279.0A 2013-07-01 2014-07-01 Procede de frittage de pieces a fritter et installation correspondante Withdrawn EP3016766A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013010885.3A DE102013010885A1 (de) 2013-07-01 2013-07-01 Verfahren zum Sintern von Sinterwerkstücken sowie Anlage hierfür
PCT/EP2014/001795 WO2015000584A2 (fr) 2013-07-01 2014-07-01 Procede de frittage de pieces a fritter et installation correspondante

Publications (1)

Publication Number Publication Date
EP3016766A2 true EP3016766A2 (fr) 2016-05-11

Family

ID=51492913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14761279.0A Withdrawn EP3016766A2 (fr) 2013-07-01 2014-07-01 Procede de frittage de pieces a fritter et installation correspondante

Country Status (5)

Country Link
US (1) US20160368828A1 (fr)
EP (1) EP3016766A2 (fr)
JP (1) JP2016527393A (fr)
DE (1) DE102013010885A1 (fr)
WO (1) WO2015000584A2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104567358A (zh) * 2015-01-30 2015-04-29 李岗 一种钻井岩屑烧砖燃气隧道窑
CN105627741B (zh) * 2016-03-21 2017-11-10 周志彬 直传导节能环保型氮化窑
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US20160368828A1 (en) 2016-12-22

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