WO2011020688A1 - Device for oxygen-free sintering - Google Patents

Device for oxygen-free sintering Download PDF

Info

Publication number
WO2011020688A1
WO2011020688A1 PCT/EP2010/061117 EP2010061117W WO2011020688A1 WO 2011020688 A1 WO2011020688 A1 WO 2011020688A1 EP 2010061117 W EP2010061117 W EP 2010061117W WO 2011020688 A1 WO2011020688 A1 WO 2011020688A1
Authority
WO
WIPO (PCT)
Prior art keywords
sintering
quartz
oxygen
base plate
oven
Prior art date
Application number
PCT/EP2010/061117
Other languages
German (de)
French (fr)
Inventor
Stefan Wolz
Original Assignee
Wdt-Wolz-Dental-Technik Gmbh
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
Priority claimed from DE201020002533 external-priority patent/DE202010002533U1/en
Priority claimed from DE201020007606 external-priority patent/DE202010007606U1/en
Application filed by Wdt-Wolz-Dental-Technik Gmbh filed Critical Wdt-Wolz-Dental-Technik Gmbh
Publication of WO2011020688A1 publication Critical patent/WO2011020688A1/en

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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/20—Methods or devices for soldering, casting, moulding or melting
    • 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
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated 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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B5/16—Arrangements of air or gas supply devices
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the invention relates to a device for oxygen-free sintering of metal or ceramic, especially in dental technology.
  • Sintering technology is used for various work. Examples include the production of dental structures made of a silver-palladium alloy or chromium-cobalt alloy called. Despite the protective gas atmosphere and / or vacuum, the frameworks after sintering are coated with a colored oxide layer, which must be removed mechanically. This often leads to structural damage, so that the product may not be useful.
  • This problem has already been solved according to EP 1 885 278 B1 (WoIz) by sintering in a powder consisting of a metal oxide (for example alumina) and an oxygen-consuming powder (for example graphite).
  • a metal oxide for example alumina
  • an oxygen-consuming powder for example graphite
  • the oxygen in the Sintering excludes and has a great ease of use.
  • a conventional sintering furnace is shown by the reference numeral 1, which can be loaded via a vertically movable table 2.
  • this table 2 can in the sintering oven a cup-shaped
  • Quartz container 3 are retracted.
  • the quartz cup 3 is supported by a base plate 8, most preferably aluminum, and is fixed on a graphite gasket 9 by means of a fixing device 10 fixing the flange of the quartz cup 3.
  • the base plate 8 lies on the base plate 8
  • Schamott block 6 which projects into the interior of the quartz cup 3 and serves as a carrier for the sintered good.
  • the material of the chamotte block does not necessarily consist of fireclay in the narrower sense. In principle, any inert and refractory material is suitable.
  • About a hole 4 argon is introduced into the quartz cup, which can emerge through the hole 7 again.
  • the bore 4 has a larger diameter than the bore 7, so that an overpressure arises in the quartz cup. It is therefore advisable to provide in the bore 7 an adjustable throttle point (not shown).
  • the bore 4 passes through a handle 5, which is only partially shown, to the argon supply.
  • a refractory seal 11 is still provided, which is pressed against the housing 1. As a result, the temperature of the base plate 8 is lowered so far that the handle. 5
  • a quartz shell 13 On the chimney block 6 is a quartz shell 13, which is held by at least one quartz base 12 at a distance from the fireclay block 6.
  • the quartz shell 13 is filled during operation with inert beads with 1 to 2 mm, in which the sintered material is inserted.
  • the material used is corundum, alumina or zirconia. It is assumed that when purging the sintering space with argon, the oxygen still possibly present in the quartz shell diffuses upwards due to its lower density, so that the quartz shell 13 becomes absolutely oxygen-free. Any oxidation of the sintered material is therefore excluded. It is also apparent from the drawing that with this construction, the lower part of the furnace is thermally less stressed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Powder Metallurgy (AREA)

Abstract

Known sintering ovens that are flooded with argon in order to allow oxygen-free sintering cannot prevent residual oxygen from being present during sintering. Said residual oxygen leads to oxidation and discoloration that must be painstakingly removed, which can also lead to unusable products. Said problem is remedied in that a closed sintering chamber having dedicated shield gas feed and removal is formed that can be removed from a sintering oven in the closed state. In this connection, nearly all parts that can come into contact with the shield gas are made of quartz. As a result of this design, any oxygen is removed during sintering. A further advantage is that the material to be sintered does not need to cool off in the sintering oven, as a result of which continuous heating and cooling of the sintering oven is avoided. A greater working speed is thus possible using conventional sintering ovens.

Description

Beschreibung  description
Vorrichtung zum sauerstofffreien Sintern  Apparatus for oxygen-free sintering
[0001] Die Erfindung betrifft eine Vorrichtung zum sauerstofffreien Sintern von Metall oder Keramik, insbesondere in der Dentaltechnik.  The invention relates to a device for oxygen-free sintering of metal or ceramic, especially in dental technology.
[0002] Stand der Technik  State of the art
[0003] Bei der Herstellung von Sintermetallgegenständen aus Metallpulver ist es üblich, den Sintervorgang unter Schutzgasatmosphäre durchzuführen. Hierbei wird meistens als billigstes Edelgas Argon eingesetzt. Die  In the production of sintered metal articles from metal powder, it is customary to carry out the sintering process under a protective gas atmosphere. This is usually used as the cheapest noble gas argon. The
Erfahrung mit diesem Verfahren hat aber gezeigt, dass selbst bei extremer Flutung des Innenraumes eines Sinterofens noch Restsauerstoff vorhanden ist, der zur Verfärbung und Oxidation des Sinterobjekts führt. Dieser Effekt ist insbesondere in der Dentaltechnik störend, wo die  However, experience with this method has shown that even with extreme flooding of the interior of a sintering furnace residual oxygen is present, which leads to discoloration and oxidation of the sintered object. This effect is particularly troublesome in dental technology, where the
Sintertechnik für verschiedene Arbeiten eingesetzt wird. Als Beispiele sei die Herstellung von Dentalgerüsten aus einer Silber-Palladium-Legierung oder Chrom- Kobalt-Legierung genannt. Trotz Schutzgasatmosphäre und/oder Vakuum sind die Gerüste nach dem Sintern mit einer farbigen Oxidschicht überzogen, die mechanisch entfernt werden muss. Hierbei kommt es häufig zu Verletzungen der Struktur, sodass das Produkt unter Umständen nicht brauchbar ist. Diesem Problem wurde gemäß der EP 1 885 278 B1 ( WoIz) schon Abhilfe geschaffen, indem die Sinterung in einem Pulver erfolgt, das aus einem Metalloxid (z.B. Alumina) und einem sauerstoffverbrauchenden Pulver (z.B. Graphit) besteht. Dieses Verfahren verlangt jedoch viel handwerkliches Geschick und ist mit einer lästigen Staubentwicklung verbunden. Selbst beim Sintern von Edelmetallen wie Gold unter Schutzgasatmospäre sind Oxidationspuren ersichtlich. Das gleiche gilt für die Sinterung von Keramik, was bei der Herstellung von Zahnteilen aus Keramikschlicker zu beobachten ist. Das oben genannte Oxidationproblem tritt auch beim Löten oder bei der Aufsinterung von Verblendmaterial auf Metallgerüste auf, insbesondere wenn die Gerüste aus Nicht-Edelmetallen bestehen.  Sintering technology is used for various work. Examples include the production of dental structures made of a silver-palladium alloy or chromium-cobalt alloy called. Despite the protective gas atmosphere and / or vacuum, the frameworks after sintering are coated with a colored oxide layer, which must be removed mechanically. This often leads to structural damage, so that the product may not be useful. This problem has already been solved according to EP 1 885 278 B1 (WoIz) by sintering in a powder consisting of a metal oxide (for example alumina) and an oxygen-consuming powder (for example graphite). However, this method requires a lot of manual skill and is associated with a troublesome dust development. Even when sintering precious metals such as gold under a protective gas atmosphere, traces of oxidation are evident. The same applies to the sintering of ceramics, which can be observed in the production of tooth parts made of ceramic slip. The above-mentioned oxidation problem also occurs during brazing or sintering of veneering material on metal frameworks, especially when the frameworks are made of non-precious metals.
[0004] Aufgabenstellung  [0004] Task
[0005] Es ist daher Aufgabe der im Anspruch 1 angegebenen Erfindung eine  It is therefore an object of the invention specified in claim 1 a
Sintervorrichtung bereitzustellen, die jeglichen Sauerstoff bei der Sinterung ausschließt und die einen großen Bedienungskomfort aufweist. To provide a sintering device, the oxygen in the Sintering excludes and has a great ease of use.
[0006] Ausführungsbeispiel  [0006] Exemplary embodiment
[0007] Im Folgenden wird die Erfindung anhand der Figur näher beschrieben und erläutert.  In the following the invention with reference to the figure will be described and explained.
[0008] In der Figur ist mit dem Bezugszeichen 1 ein herkömmlicher Sinterofen gezeigt, der über einen vertikal verfahrbaren Tisch 2 beschickbar ist. Mit Hilfe dieses Tisches 2 kann in den Sinterofen ein becherförmiger  In the figure, a conventional sintering furnace is shown by the reference numeral 1, which can be loaded via a vertically movable table 2. With the help of this table 2 can in the sintering oven a cup-shaped
Quarzbehälter 3 eingefahren werden. Der Quarzbecher 3 wird von einer Basisplatte 8, am besten aus Aluminium, getragen und ist auf einer Graphitdichtung 9 mittels einer Fixiervorrichtung 10 befestigt, die den Flansch des Quarzbechers 3 fixiert.Auf der Basisplatte 8 liegt ein  Quartz container 3 are retracted. The quartz cup 3 is supported by a base plate 8, most preferably aluminum, and is fixed on a graphite gasket 9 by means of a fixing device 10 fixing the flange of the quartz cup 3. The base plate 8 lies on the base plate 8
Schamottblock 6, der in das Innere des Quarzbechers 3 hineinragt und als Träger für das Sintergut dient. Das Material des Schamottblocks besteht nicht notwendigerweise aus Schamott im engeren Sinne. Prinzipiell ist jedes inerte und feuerfestes Material geeignet. Über eine Bohrung 4 wird Argon in den Quarzbecher eingeleitet, das das über die Bohrung 7 wieder austreten kann. Die Bohrung 4 hat einen größeren Durchmesser als die Bohrung 7, sodass in dem Quarzbecher ein Überdruck entsteht. Es ist daher empfehlenswert, in der Bohrung 7 eine einstellbare Drosselstelle (nicht gezeigt) vorzusehen. Die Bohrung 4 läuft durch einen Handgriff 5, der nur ansatzweise gezeigt ist, zu der Argonversorgung. Um den  Schamott block 6, which projects into the interior of the quartz cup 3 and serves as a carrier for the sintered good. The material of the chamotte block does not necessarily consist of fireclay in the narrower sense. In principle, any inert and refractory material is suitable. About a hole 4 argon is introduced into the quartz cup, which can emerge through the hole 7 again. The bore 4 has a larger diameter than the bore 7, so that an overpressure arises in the quartz cup. It is therefore advisable to provide in the bore 7 an adjustable throttle point (not shown). The bore 4 passes through a handle 5, which is only partially shown, to the argon supply. To the
Innenraum des Sinterofens abzudichten, ist noch eine feuerfeste Dichtung 11 vorgesehen, die an das Gehäuse 1 andrückbar ist. Dadurch wird die Temperatur der Basisplatte 8 soweit abgesenkt, dass der Griff 5  To seal the interior of the sintering furnace, a refractory seal 11 is still provided, which is pressed against the housing 1. As a result, the temperature of the base plate 8 is lowered so far that the handle. 5
handhabbar ist.  is manageable.
[0009] Auf dem Schamottblock 6 befindet sich eine Quarzschale 13, die durch mindestens einen Quarzfuß 12 in Abstand vom Schamottblock 6 gehalten wird. Die Quarzschale 13 wird im Betrieb mit inerten Kügelchen mit 1 bis 2 mm gefüllt, in die das Sintergut eingelegt wird. Als Material kommt Korund, Alumina oder Zirconia in Frage. Es wird angenommen, dass beim Spülen des Sinterraumes mit Argon der möglicherweise in der Quarzschale noch vorhandene Sauerstoff aufgrund seiner geringeren Dichte nach oben abdiffundiert, sodass die Quarzschale 13 absolut sauerstofffrei wird. Jegliche Oxidation des Sintergutes ist daher ausgeschlossen. Es ist ferner aus der Zeichnung ersichtlich, dass mit dieser Konstruktion der untere Teil des Ofens thermisch weniger belastet wird. On the chimney block 6 is a quartz shell 13, which is held by at least one quartz base 12 at a distance from the fireclay block 6. The quartz shell 13 is filled during operation with inert beads with 1 to 2 mm, in which the sintered material is inserted. The material used is corundum, alumina or zirconia. It is assumed that when purging the sintering space with argon, the oxygen still possibly present in the quartz shell diffuses upwards due to its lower density, so that the quartz shell 13 becomes absolutely oxygen-free. Any oxidation of the sintered material is therefore excluded. It is also apparent from the drawing that with this construction, the lower part of the furnace is thermally less stressed.
[0010] Wie weiterhin aus der Zeichnung ersichtlich ist, können die  As further apparent from the drawing, the
Einzelelemente mit den Bezugszeichen 3 bis 13 als Einheit aus dem Sinterofen entnommen werden, wenn sich der Tisch 2 in der unteren Position befindet. Das hat die Vorteile, dass nach Ablauf der Sinterzeit der Ofen nicht abgekühlt werden muss, da sich das Sintergut noch unter Schutzgas befindet und der Zutritt von Sauerstoff verhindert wird. Ferner ist der Ofen mit einer zweiten Einheit sofort wieder beschickbar, was den Produktionszyklus beträchtlich beschleunigt.  Individual elements with the reference numerals 3 to 13 are removed as a unit from the sintering furnace when the table 2 is in the lower position. This has the advantages that after the expiration of the sintering time, the oven does not have to be cooled because the sintered material is still under protective gas and the access of oxygen is prevented. Furthermore, the furnace is immediately rechargeable with a second unit, which considerably speeds up the production cycle.
[0011] Beim Sintern hat sich gezeigt, dass die entstehenden Gase gegenüber dem Quarzglas bei Temperaturen um 1200 °C relativ aggressiv sind. Bei der Suche, die Korrosion in den Griff zu bekommen, wurde gefunden, dass eine Schicht aus Bornitrit die Korrosion verhindern kann. Es wird daher empfohlen, das Quarzglas mit einem Bornitritspray zu beschichten.  During sintering, it has been shown that the resulting gases are relatively aggressive towards the quartz glass at temperatures around 1200 ° C. In the search to control the corrosion, it has been found that a layer of boron nitride can prevent corrosion. It is therefore recommended to coat the quartz glass with a boron nitrite spray.

Claims

Ansprüche claims
1. Vorrichtung zum sauerstofffreien Sintern von Metall oder Keramik, in einem herkömmlichen Sinterofen, dadurch gekennzeichnet, dass ein Quarzbehälter (3) einen Sinterraum bildet, der mit Schutzgas flutbar ist, das über eine  1. A device for oxygen-free sintering of metal or ceramic, in a conventional sintering furnace, characterized in that a quartz container (3) forms a sintering space, which is floodable with protective gas, which via a
Bohrung (7) abführbar ist und im heißen Zustand aus dem Sinterofen entnehmbar ist.  Bore (7) can be discharged and can be removed from the sintering furnace in the hot state.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der  2. Apparatus according to claim 1, characterized in that the
Quarzbehälter (3) becherförmig ist.  Quartz container (3) is cup-shaped.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der  3. Apparatus according to claim 2, characterized in that the
Quarzbehälter (3) mit seiner Öffnung auf einem Schamottblock (6) aufliegt, der eine Basisplatte (8) thermisch isoliert.  Quartz container (3) rests with its opening on a fireclay block (6), which thermally insulated a base plate (8).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass für das Sintergut eine Quarzschale (13) vorgesehen ist, die durch mindestens einen Quarzfuß (12) im Abstand vom Schamottblock (6) gehalten wird.  4. Apparatus according to claim 3, characterized in that a quartz shell (13) is provided for the sintered material, which is held by at least one quartz base (12) at a distance from the fireclay block (6).
5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die  5. Apparatus according to claim 3 or 4, characterized in that the
Basisplatte (8) aus Aluminium besteht.  Base plate (8) consists of aluminum.
6. Vorrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass die Basisplatte (8) mit einem Griff (5) versehen ist, über den die Zufuhr des Schutzgases erfolgt.  6. Device according to one of claims 3 to 5, characterized in that the base plate (8) is provided with a handle (5) via which the supply of the protective gas takes place.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Bohrung (7) als Drosselstelle ausgebildet ist.  7. Device according to one of claims 1 to 6, characterized in that the bore (7) is designed as a throttle point.
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Teile aus Quarzglas mit Bornitrit beschichtet sind.  8. Device according to one of claims 1 to 7, characterized in that the parts made of quartz glass are coated with boron nitride.
9. Vorrichtung nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, dass die Quarzschale (13) mit inerten Kugeln gefüllt ist.  9. Device according to one of claims 4 to 8, characterized in that the quartz shell (13) is filled with inert balls.
PCT/EP2010/061117 2009-08-17 2010-07-30 Device for oxygen-free sintering WO2011020688A1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE102009037737.9 2009-08-17
DE102009037737 2009-08-17
DE201020002533 DE202010002533U1 (en) 2010-02-19 2010-02-19 Apparatus for oxygen-free sintering
DE202010002533.8 2010-02-19
DE201020007606 DE202010007606U1 (en) 2010-06-04 2010-06-04 Apparatus for oxygen-free sintering
DE202010007606.4 2010-06-04

Publications (1)

Publication Number Publication Date
WO2011020688A1 true WO2011020688A1 (en) 2011-02-24

Family

ID=42752361

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/061117 WO2011020688A1 (en) 2009-08-17 2010-07-30 Device for oxygen-free sintering

Country Status (1)

Country Link
WO (1) WO2011020688A1 (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011005465U1 (en) 2011-04-20 2011-06-29 WDT-Wolz-Dental-Technik GmbH, 55566 Device for oxygen-free sintering of metal or ceramic
DE202011106734U1 (en) 2011-10-13 2011-11-15 Wdt-Wolz-Dental-Technik Gmbh Device for oxygen-free sintering of metal or ceramic
DE202012004493U1 (en) 2012-05-05 2012-06-06 Wdt-Wolz-Dental-Technik Gmbh Sintered insert for a sintering furnace for oxygen-free sintering of metal or ceramic
DE102012100631A1 (en) 2012-01-25 2013-07-25 Amann Girrbach Ag Sintering apparatus useful for sintering dental workpieces in a protective gas atmosphere, comprises a sintering chamber made of metal or metal alloy including gas inlet and -outlet, and a sintered shell made of metal or metal alloy
DE102012100632A1 (en) 2012-01-25 2013-07-25 Amann Girrbach Ag sintering apparatus
DE202013104916U1 (en) 2013-11-04 2013-11-11 Thermo-Star GmbH sintering apparatus
WO2013167289A1 (en) 2012-05-05 2013-11-14 Wdt-Wolz-Dental-Technik Gmbh Sintered insert for a sintering furnace for the oxygen-free sintering of metal or ceramic material
EP2703760A1 (en) 2012-08-30 2014-03-05 STEGER, Heinrich Dental oven for sintering a dental prosthesis
EP2792985A1 (en) 2013-04-18 2014-10-22 Amann Girrbach AG Sintering device
EP2792332A1 (en) 2013-04-18 2014-10-22 Amann Girrbach AG Assembly comprising at least one workpiece to be sintered
KR101561126B1 (en) 2014-09-19 2015-10-19 덴스타주식회사 Sintering device
DE102016210437A1 (en) 2016-06-13 2017-12-14 Dentalworx Solutions GmbH Sintered tray with direct flooding system
EP3659548A1 (en) 2018-11-29 2020-06-03 Ivoclar Vivadent AG Method for producing a dental restoration
WO2021078742A1 (en) 2019-10-21 2021-04-29 Wdt-Wolz-Dental-Technik Gmbh Method for producing moulded parts, in particular dental moulded parts
EP4137312A1 (en) 2021-08-16 2023-02-22 Ivoclar Vivadent AG Method for producing a dental restoration

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4308244A1 (en) * 1992-03-19 1993-09-23 Baruch Indig Heat treatment and sintering in controlled atmos for prodn. of dental prostheses - using oven comprising inverted cup-shaped quartz vessel surrounded by heating coil and insulation and sealed to baseplate by heat-resisting O=rings
US20010023056A1 (en) * 2000-03-15 2001-09-20 Ivoclar Vivadent Ag Dental device
EP1885278B1 (en) 2005-06-03 2009-01-21 WDT-Wolz-Dental-Technik GmbH Method for producing tooth parts from dental-grade metal powder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4308244A1 (en) * 1992-03-19 1993-09-23 Baruch Indig Heat treatment and sintering in controlled atmos for prodn. of dental prostheses - using oven comprising inverted cup-shaped quartz vessel surrounded by heating coil and insulation and sealed to baseplate by heat-resisting O=rings
US20010023056A1 (en) * 2000-03-15 2001-09-20 Ivoclar Vivadent Ag Dental device
EP1885278B1 (en) 2005-06-03 2009-01-21 WDT-Wolz-Dental-Technik GmbH Method for producing tooth parts from dental-grade metal powder

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011005465U1 (en) 2011-04-20 2011-06-29 WDT-Wolz-Dental-Technik GmbH, 55566 Device for oxygen-free sintering of metal or ceramic
DE202011106734U1 (en) 2011-10-13 2011-11-15 Wdt-Wolz-Dental-Technik Gmbh Device for oxygen-free sintering of metal or ceramic
WO2013053950A1 (en) 2011-10-13 2013-04-18 Wdt-Wolz-Dental-Technik Gmbh System for sintering metal or ceramics
US9285169B2 (en) 2012-01-25 2016-03-15 Amann Girrbach Ag Sintering device
DE102012100631A1 (en) 2012-01-25 2013-07-25 Amann Girrbach Ag Sintering apparatus useful for sintering dental workpieces in a protective gas atmosphere, comprises a sintering chamber made of metal or metal alloy including gas inlet and -outlet, and a sintered shell made of metal or metal alloy
DE102012100632A1 (en) 2012-01-25 2013-07-25 Amann Girrbach Ag sintering apparatus
WO2013110098A1 (en) 2012-01-25 2013-08-01 Amann Girrbach Ag Sintering device
DE202012004493U1 (en) 2012-05-05 2012-06-06 Wdt-Wolz-Dental-Technik Gmbh Sintered insert for a sintering furnace for oxygen-free sintering of metal or ceramic
WO2013167289A1 (en) 2012-05-05 2013-11-14 Wdt-Wolz-Dental-Technik Gmbh Sintered insert for a sintering furnace for the oxygen-free sintering of metal or ceramic material
EP2703760A1 (en) 2012-08-30 2014-03-05 STEGER, Heinrich Dental oven for sintering a dental prosthesis
AT513348A1 (en) * 2012-08-30 2014-03-15 Steger Heinrich Dental oven for sintering a denture
AT513348B1 (en) * 2012-08-30 2014-06-15 Steger Heinrich Dental oven for sintering a denture
CN105358928B (en) * 2013-04-18 2017-05-24 阿曼·吉尔巴赫股份公司 Sintering apparatus
EP2792332A1 (en) 2013-04-18 2014-10-22 Amann Girrbach AG Assembly comprising at least one workpiece to be sintered
WO2014169304A1 (en) 2013-04-18 2014-10-23 Amann Girrbach Ag Arrangement having at least one workpiece for sintering
WO2014169303A1 (en) 2013-04-18 2014-10-23 Amann Girrbach Ag Sintering apparatus
US10322453B2 (en) 2013-04-18 2019-06-18 Amann Girrbach Ag Sintering apparatus
US10117732B2 (en) 2013-04-18 2018-11-06 Amann Girrbach Ag Arrangement having at least one workpiece for sintering
CN105358928A (en) * 2013-04-18 2016-02-24 阿曼·吉尔巴赫股份公司 Sintering apparatus
EP2792985A1 (en) 2013-04-18 2014-10-22 Amann Girrbach AG Sintering device
DE202013104916U1 (en) 2013-11-04 2013-11-11 Thermo-Star GmbH sintering apparatus
EP2868407A2 (en) 2013-11-04 2015-05-06 Thermo-Star GmbH Sintering device
WO2016043392A1 (en) * 2014-09-19 2016-03-24 덴스타주식회사 Sintering device
KR101561126B1 (en) 2014-09-19 2015-10-19 덴스타주식회사 Sintering device
DE102016210437A1 (en) 2016-06-13 2017-12-14 Dentalworx Solutions GmbH Sintered tray with direct flooding system
DE102016210437B4 (en) 2016-06-13 2018-11-29 dentalworx solution GmbH Sintered tray with direct flooding system
EP3659548A1 (en) 2018-11-29 2020-06-03 Ivoclar Vivadent AG Method for producing a dental restoration
US11793613B2 (en) 2018-11-29 2023-10-24 Ivoclar Vivadent Ag Process for the production of a dental restoration
WO2021078742A1 (en) 2019-10-21 2021-04-29 Wdt-Wolz-Dental-Technik Gmbh Method for producing moulded parts, in particular dental moulded parts
WO2021078740A2 (en) 2019-10-21 2021-04-29 Wdt-Wolz-Dental-Technik Gmbh Method for producing a cold-casting mould, and use of a cold-casting mould for the production of moulded parts, in particular dentures
EP4137312A1 (en) 2021-08-16 2023-02-22 Ivoclar Vivadent AG Method for producing a dental restoration

Similar Documents

Publication Publication Date Title
WO2011020688A1 (en) Device for oxygen-free sintering
DE202010007606U1 (en) Apparatus for oxygen-free sintering
EP2602036B1 (en) Apparatus and method for sintering sinter material
EP2258497B1 (en) Method for hot forming a workpiece and equipment for reducing the workpiece's heat emission
DE202010002533U1 (en) Apparatus for oxygen-free sintering
DE1758845B2 (en) PROCESS FOR MANUFACTURING PRECISION CASTING FORMS FOR REACTIVE METALS
DE202011106734U1 (en) Device for oxygen-free sintering of metal or ceramic
KR101736582B1 (en) Ladle filler and opening method using the same
DE2110274B2 (en) DEVICE FOR MELTING METAL SPONGE BY INERT GAS PLASMS
DE2158115A1 (en) Metal casting device and metal casting process
EP2703760B1 (en) Dental oven for sintering a dental prosthesis
DE4017176C2 (en) Use of a molybdenum alloy
DE3724995A1 (en) Process for manufacturing a composite body and the composite body itself
DE3833337A1 (en) Apparatus for rapid cooling of workpieces and of the pressure container in an HIP plant
EP1496325B1 (en) Process for combined debinding and sintering of glass-ceramic, ceramic and metallic shaped articles
DE3050181A1 (en) Method for manufacturing a hollow glass punch for piece molding
EP2546009A2 (en) Method and device for debinding and sintering powder metallurgically produced products
CN105712745A (en) Colored ceramic and preparation method thereof
EP3657111B1 (en) Method for repairing a used flushing body, a floor electrode and / or used lining of a metallurgical vessel
DE102005022242B4 (en) Plant for debinding / residual removal and sintering
DE3437417C2 (en)
Danninger et al. In-situ characterization of the sintering process through process-temperature control rings
DE2127690A1 (en) Blast furnace blow moulds - having a nickel based and ceramic layered coating to improve lifetime
DE3029788A1 (en) METHOD FOR PREVENTING THERMAL CHIPING FROM A CERAMIC OBJECT
DE102016210437B4 (en) Sintered tray with direct flooding system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10745583

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10745583

Country of ref document: EP

Kind code of ref document: A1