WO1985000130A1 - Manufacturing of sintered ceramic moulded bodies - Google Patents

Manufacturing of sintered ceramic moulded bodies Download PDF

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Publication number
WO1985000130A1
WO1985000130A1 PCT/EP1984/000187 EP8400187W WO8500130A1 WO 1985000130 A1 WO1985000130 A1 WO 1985000130A1 EP 8400187 W EP8400187 W EP 8400187W WO 8500130 A1 WO8500130 A1 WO 8500130A1
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WO
WIPO (PCT)
Prior art keywords
mixture
mold
corundum
abrasive material
carborundum
Prior art date
Application number
PCT/EP1984/000187
Other languages
German (de)
French (fr)
Inventor
Udo Rieser
Original Assignee
Udo Rieser
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 Udo Rieser filed Critical Udo Rieser
Publication of WO1985000130A1 publication Critical patent/WO1985000130A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/222—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by freeze-casting or in a supercritical fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/007—Producing shaped prefabricated articles from the material by freezing the material

Definitions

  • the invention relates to a method for producing sintered ceramic molded articles according to the preamble of claim 1, a special mold for carrying out this process and a special abrasive material molded article produced by the method according to the invention.
  • Sintered ceramic moldings are usually produced by compression molding the raw material in question with a binder as a weakly water-containing, granular mixture, drying it after removal from the mold and then sintering, if necessary in two stages, with intermediate processing. This requires complex metal molds and there is also the risk that the compact will break out during demolding, which is why more complicated contours are only produced by the aforementioned post-sintering post-processing.
  • the object of the invention is to remedy this, i.e. the production of a sintered ceramic shaped body, e.g. To enable abrasive material moldings with low manufacturing and above all molding costs, even if only small quantities are required.
  • a metal mold according to the invention by a cheap casting mold, for example made of rubber, plastic, plaster or wax, which is made possible by a casting process instead of a compression molding process, allows the molding costs to be reduced enormously.
  • the cost of the freeze dryer required is roughly offset by the elimination of a press.
  • the shaped, frozen mixture can be easily removed from the mold while maintaining detailed contours and / or surface structures, as may be desirable for the finished molded body.
  • toothed grinding wheels such as those that form the subject of DE-GM 1367 319, but also other sintered ceramic moldings and correspondingly more stable molds for other molding processes can easily be produced without reworking.
  • Mold casting using an aqueous mixture followed by freeze-drying results in an extremely dense, firm bond which, for example, makes it very difficult to break out abrasive material grains. They therefore remain effective over their entire lifespan, which in turn benefits the durability of a shaped abrasive material produced according to the invention.
  • Using a mold made of wax or the like it is not necessary to completely demold the frozen mixture before the sintering process, since the wax residues burn off essentially without residues during the sintering process. This is of particular interest where there is a need to work with cores in a more complicated shape.
  • Claims 2 to 10 indicate advantageous design options for the method according to the invention.
  • Claim 11 is directed to a special form suitable therefor and claim 12 to an extremely durable abrasive material molded body obtained with the method according to the invention.
  • a mixture is produced from powdery ⁇ -aluminum oxide with additions of, among other things, zirconium silicate and dextrin, to which approximately three times the amount by weight of high-grade corundum with different grain sizes between 50 and 280 mesh is then added.
  • This entire mixture is mixed with water, to which commercial dispersants and the like may have been added, to give a pourable slurry which is poured into a rubber negative mold of the finished article with an excess of about 3.6%.
  • the poured-in mixture is deep-frozen in this form, after which it is removed from the mold.
  • De-molding can be carried out in a simple manner by pushing out, if necessary with progressive detachment of the flexible mold from one place, or for example by pushing out with compressed air, for which purpose the mold only needs to have a channel opening into the mold cavity.
  • the frozen mixture is subjected to a freeze-drying process, which results in a dry molding with a chalk-like consistency.
  • This molding is fired at a temperature of about 1770 ° C (2043 ° K), which results in the finished abrasive material molded body.
  • the otherwise fully preserved corundum grains occur in a melted, welded state, while the added dextrin has evaporated.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

For manufacturing sintered ceramic moulded bodies and particularly moulded bodies of abrasive material including an abrasive material with relatively coarse grains such as corundum or carborundum, an aqueous mixture of raw material in question is cast into a mould for example of rubber, and withdrawn from the mould. The cooled moulded mixture is subjected to a freeze-drying process before it is fired. A particularly convenient mixture for a moulded body of abrasive material is a mixture comprised of (with respect to the dry mixture) about 70% by weight of refined corundum of which the grain size varies between 50 and 280 mesh, and of a base substance consisting substantially of pulverulent alpha-aluminium oxide with addition of potash feldspar, zirconium silicate and dextrine, and having a sintering temperature of 1770oC (2043oK).

Description

Herstellung sinterkeramischer Foimkörper Production of sintered ceramic foam bodies
Die Erfindung betrifft ein Verfahren zur Herstellung sinterkeramischer Formkörper gemäß Gattungsbegriff des Patentanspruchs 1, eine spezielle Form zur Durchführung dieses Verfahrens sowie einen speziellen nach dem erfindungsgemäßen Verfahren hergestellten SchleifmaterialFormkörper.The invention relates to a method for producing sintered ceramic molded articles according to the preamble of claim 1, a special mold for carrying out this process and a special abrasive material molded article produced by the method according to the invention.
Üblicherweise werden, sinterkeramische Formkörper dadurch hergestellt, daß das betreffende mit einem Bindemittel versetzte Rohmaterial als schwach wasserhaltiges, körniges Gemisch formgepreßt, nach dem Entformen getrocknet und dann, ggf. in zwei Stufen mit einer dazwischenliegenden Nachbearbeitung, sintergebrannt wird. Dazu sind aufwendige Metallformen erforderlich, und zudem besteht die Gefahr, daß der Preßling beim Entformen ausbricht, weshalb man kompliziertere Konturen erst durch die vorerwähnte, auf einen Vorsintervorgang folgende Nachbearbeitung herstellt.Sintered ceramic moldings are usually produced by compression molding the raw material in question with a binder as a weakly water-containing, granular mixture, drying it after removal from the mold and then sintering, if necessary in two stages, with intermediate processing. This requires complex metal molds and there is also the risk that the compact will break out during demolding, which is why more complicated contours are only produced by the aforementioned post-sintering post-processing.
Aus der US-PS 2 379 569 ist es weiterhin bekannt, einen Schleifmaterial-Formkörper beispielsweise aus Karborund oder Schmirgel unter Zusatz eines Bindemittels u.a. durch Formgießen herzustellen. Darüber hinaus sind mancherlei sinterkeramische Schleifmaterial-Formkörper bekannt. Beim Versuch, einen etwa für das manuelle Schärfen von Messern hochwirksamen, dabei aber genügend dauerhaften, dichten Schleifmaterial-Formkörper unter Einschluß eines verhältnismäßig grobkörnigen Schleifmaterials, wie z.B. Korund oder Karborund mit einer ;Körnung von beispielsweise um 100 mesh durch Pressen mit anschließendem Sintern herzustellen, zeigt sich, daß die dafür erforderlichen Metallformen, selbst wenn aus Hartmetall bestehend, rasch verschleißen. Dies hat noch höhere Formkosten zur Folge.From US Pat. No. 2,379,569, it is also known to produce a shaped abrasive material, for example from carborundum or emery, with the addition of a binder, inter alia, by molding. In addition, various sintered ceramic shaped abrasive materials are known. When attempting to form a highly effective, but sufficiently durable, dense abrasive material molded body for the manual sharpening of knives, including a relatively coarse-grained abrasive material such as corundum or to produce carborundum with a grain size of, for example, 100 mesh by pressing with subsequent sintering, it is found that the metal molds required for this, even if made of hard metal, wear out rapidly. This results in even higher molding costs.
Der Erfindung liegt die Aufgabe zugrunde, hier Abhilfe zu schaffen, d.h. die Herstellung eines sinterkeramischen Formkörpers wie z.B. Schleifmaterial-Formkörpers unter geringen Herstellungs- und vor allem Formkoβten zu ermöglichen, selbst dann, wenn nur kleine Stückzahlen benötigt werden.The object of the invention is to remedy this, i.e. the production of a sintered ceramic shaped body, e.g. To enable abrasive material moldings with low manufacturing and above all molding costs, even if only small quantities are required.
Diese Aufgabe ist mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved with the features of patent claim 1.
Der erfindungsgemäße Ersatz einer Metallform durch eine billige Gießform beispielsweise aus Gummi, Kunststoff, Gips oder Wachs, der durch ein Gieß- anstatt eines Preßformverfahrens ermöglicht wird, läßt die Formkosten ganz enorm sinken. Die Kosten der erforderlichen Gefriertrocknungsanlage werden in etwa durch den Wegfall einer Presse kompensiert. Dazu noch kann das geformte gefronene Gemisch aus der Form unter Wahrung detaillierter Konturen und/oder Oberflächenstrukturen, wie sie für den fertigen Formkörper wünschenswert sein mögen, leicht entformt werden. So lassen sich beispielsweise gezahnte Schleifscheiben, wie sie etwa den Gegenstand des DE-GM 1367 319 bilden, aber auch sonstige sinterkeramische Formkörper sowie entsprechend stabilere Formen für anderweitige Formvorgänge ohne Nachbearbeitung leicht herstellen. Dabei ergibt das Formgießen unter Verwendung eines wässerigen Gemischs mit anschließender Gefriertrocknung einen äußerst dichten, festen Verbund, der z.B. das Ausbrechen von Schleifmaterialkörnern sehr erschwert. Diese bleiben mithin im wesentlichen über ihre gesamte Lebensdauer wirksam, was wiederum der Dauerhaftigkeit eines erfindungsgemäß hergestellten Schleifmaterial-Formkörpers zugute kommt. Unter Verwendung einer Form aus Wachs oder dergl. ist ein vollkommenes Entformen des gefrorenen Gemischs vor dem SinterVorgang nicht erforderlich, da die Wachsreste beim Sintervorgang im wesentlichen rückstandsfrei verbrennen. Dies ist insbesondere dort von Interesse, wo bei einer komplizierteren Formgebung mit Kernen gearbeitet werden muß.The replacement of a metal mold according to the invention by a cheap casting mold, for example made of rubber, plastic, plaster or wax, which is made possible by a casting process instead of a compression molding process, allows the molding costs to be reduced enormously. The cost of the freeze dryer required is roughly offset by the elimination of a press. In addition, the shaped, frozen mixture can be easily removed from the mold while maintaining detailed contours and / or surface structures, as may be desirable for the finished molded body. For example, toothed grinding wheels, such as those that form the subject of DE-GM 1367 319, but also other sintered ceramic moldings and correspondingly more stable molds for other molding processes can easily be produced without reworking. Mold casting using an aqueous mixture followed by freeze-drying results in an extremely dense, firm bond which, for example, makes it very difficult to break out abrasive material grains. They therefore remain effective over their entire lifespan, which in turn benefits the durability of a shaped abrasive material produced according to the invention. Using a mold made of wax or the like, it is not necessary to completely demold the frozen mixture before the sintering process, since the wax residues burn off essentially without residues during the sintering process. This is of particular interest where there is a need to work with cores in a more complicated shape.
Die Ansprüche 2 bis 10 geben vorteilhafte Ausgestaltungsmöglichkeiten des erfindungsgemäßen Verfahrens an. Anspruch 11 richtet sich auf eine spezielle dafür geeignete Form und Anspruch 12 auf einen mit dem erfindungsgemäßen Verfahren erhaltenen, äußerst dauerhaften SchleifmaterialFormkörper.Claims 2 to 10 indicate advantageous design options for the method according to the invention. Claim 11 is directed to a special form suitable therefor and claim 12 to an extremely durable abrasive material molded body obtained with the method according to the invention.
Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand der Herstellung eines SchleifmaterialFormkörpers nach Anspruch 12 genauer beschrieben:A preferred exemplary embodiment of the invention is described in more detail below on the basis of the production of an abrasive material shaped body according to claim 12:
Aus pulverförmigem α-Aluminiumoxid mit Zusätzen u.a. von Zirkonsilikat und Dextrin wird ein Gemisch hergestellt, dem sodann etwa die dreifache Gewichtsmenge Edelkorund mit verschiedenen Korngrößen zwischen 50 und 280 mesh zugesetzt wird. Dieses gesamte Gemisch wird mit Wasser, dem noch handelsübliche Dispergiermittel und dergl. zugegeben sein können, zu einem gießfähigen Brei angerührt, der in eine Gummi-Negativform des fertigen Gegenstandes mit etwa 3,6 % Übermaß gegossen wird. In dieser Form wird das eingegossene Gemisch tiefgefroren, worauf es entformt wird. Das Entformen kann auf einfache Weise durch Herausdrücken, ggf. unter von einer Stelle aus fortschreitendem Ablösen der flexiblen Form, oder beispielsweise auch durch Herausdrücken mittels Druckluft erfolgen, wozu die Form lediglich einen in den Formhohlraum mündenden Kanal aufzuweisen braucht. Insbesondere mit dem erstgenannten Vorgehen lassen sich selbst detailliertere Konturen und/oder Oberflächenstrukturen unbeschädigt entformen.A mixture is produced from powdery α-aluminum oxide with additions of, among other things, zirconium silicate and dextrin, to which approximately three times the amount by weight of high-grade corundum with different grain sizes between 50 and 280 mesh is then added. This entire mixture is mixed with water, to which commercial dispersants and the like may have been added, to give a pourable slurry which is poured into a rubber negative mold of the finished article with an excess of about 3.6%. The poured-in mixture is deep-frozen in this form, after which it is removed from the mold. De-molding can be carried out in a simple manner by pushing out, if necessary with progressive detachment of the flexible mold from one place, or for example by pushing out with compressed air, for which purpose the mold only needs to have a channel opening into the mold cavity. In particular, with the first-mentioned procedure you can yourself Demold more detailed contours and / or surface structures undamaged.
Das gefrorene Gemisch wird einem Gefriertrocknungsprozeß unterzogen, wodurch sich ein trockener Formling etwa kreideartiger Konsistenz ergibt. Dieser Formling wird bei einer Temperatur von etwa 1770 °C (2043 °K) gebrannt, wodurch sich der fertige Schleifmaterial-Formkörper ergibt. In diesem ausgesprochen dichten, festen Formkörper treten die im übrigen aber voll erhaltenen Korundkörner in angeschmolzenem, miteinander verschweißtem Zustand auf, während sich das zugegebene Dextrin verflüchtigt hat. The frozen mixture is subjected to a freeze-drying process, which results in a dry molding with a chalk-like consistency. This molding is fired at a temperature of about 1770 ° C (2043 ° K), which results in the finished abrasive material molded body. In this extremely dense, solid shaped body, the otherwise fully preserved corundum grains occur in a melted, welded state, while the added dextrin has evaporated.

Claims

Patentansprüche: Claims:
1. Verfahren zur Herstellung sinterkeramischer Formkörper, wobei ein wässeriges Gemisch des betreffenden Rohmaterials in einer Form geformt, getrocknet und dann gebrannt wird, dadurch g e k e n n z e i c h n e t , daß als Form eine Gießform aus Gummi, Kunststoff, Gips, Wachs oder dergl. Verwendung findet, daß das wässerige Gemisch als gießbarer Brei in die Form gegossen und in der Form gefroren wird, daß das gefrorene Gemisch aus der Form entnommen und einem Gefriertrocknungsprozeß unterzogen wird und daß das so getrocknete Gemisch gebrannt wird.1. A method for producing sintered ceramic moldings, wherein an aqueous mixture of the raw material in question is molded in a mold, dried and then fired, characterized in that a mold made of rubber, plastic, plaster, wax or the like is used as the mold that the pouring the aqueous mixture into the mold as a pourable slurry and freezing it in such a way that the frozen mixture is removed from the mold and subjected to a freeze-drying process and the mixture thus dried is fired.
2. Verfahren nach Anspruch 1, dadurch g e k e n n z e i c h n e t , daß als Rohmaterial ein Oxidkeramikgemisch Verwendung findet.2. The method according to claim 1, characterized in that an oxide ceramic mixture is used as the raw material.
3. Verfahren nach Anspruch 2, dadurch g e k e n n z e i c h n e t , daß das verwendete Oxidkeramikgemisch ein körniges Schleifmaterial, wie z.B. Korund oder Karborund, enthält.3. The method according to claim 2, characterized in that the oxide ceramic mixture used comprises a granular abrasive material, such as e.g. Contains corundum or carborundum.
4. Verfahren nach Anspruch 3, dadurch g e k e n n z e i c h n e t , daß das trockene Gemisch zwischen 20 Gew.-% und 80 Gew.-%, vorzugsweise etwa 70 Gew.-%, Edelkorund und/oder Karborund mit einer Korngröße zwischen 50 und 280 mesh enthält.4. The method according to claim 3, characterized in that the dry mixture contains between 20 wt.% And 80 wt.%, Preferably about 70 wt.%, High-grade corundum and / or carborundum with a grain size between 50 and 280 mesh.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch g e k e n n z e i c h n e t , daß das Gemisch als Grundsubstanz im wesentlichen α-Aluminiumoxid enthält.5. The method according to any one of the preceding claims, characterized in that the mixture essentially contains α-aluminum oxide as the basic substance.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch g e k e n n z e i c h n e t , daß das Gemisch Zusätze von Kalifeldspat und/oder Zirkonsilikat enthält. 6. The method according to any one of the preceding claims, characterized in that the mixture contains additions of potassium feldspar and / or zirconium silicate.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch g e k e nn z e i c h n e t , daß das Gemisch als Rohbindemittel Dextrin enthält.7. The method according to any one of the preceding claims, characterized in that the mixture contains dextrin as the raw binder.
8. Verfahren nach einem der vorhergehenden Ansprüche einschl. Anspruch 5, dadurch g e k e n n z e i c h n e t , daß eine Sintertemperatur von etwa 1770 °C (2043 °K) verwendet wird.8. The method according to any one of the preceding claims including claim 5, characterized in that a sintering temperature of approximately 1770 ° C (2043 ° K) is used.
9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch g e k e n n z e i c h n e t , daß dem Formkörper beim Formen durch eine entsprechend strukturierte Formwand eine gewünschte Oberflächenstruktur des fertigen Formkörpers gegeben wird.9. The method according to any one of the preceding claims, characterized in that the molded body is given a desired surface structure of the finished molded body during molding through an appropriately structured mold wall.
10. Verfahren nach einem der vorhergehenden Ansprüche unter Verwendung einer Form aus Wachs, dadurch g e k e n n z e i c h n e t , daß schwer entfernbare Formteile wie vor allem Kernteile bis zum Sintervorgang an dem gefrorenen Gemisch belassen werden, um während des Sintervorganges zu verbrennen.10. The method according to any one of the preceding claims using a mold made of wax, g e k e n e z e i c h n e t that difficult to remove molded parts such as core parts are left until the sintering process on the frozen mixture to burn during the sintering process.
11. Form aus Gummi, Kunststoff, Gips, Wachs oder dergl. zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, dadurch g e k e n n z e i c h n e t , daß die Formwand - in Negativform - bereits eine gewünschte Oberflächenstruktur des fertigen Formkörpers aufweist.11. Mold made of rubber, plastic, plaster, wax or the like. To carry out the method according to any one of the preceding claims, characterized in that the mold wall - in negative form - already has a desired surface structure of the finished molded body.
12. Nach dem Verfahren gemäß einem der Ansprüche 1 bis 10 hergestellter hochdichter Schleifmaterial-Formkörper mit einem körnigen Schleifmaterial in Gestalt von Korund und/ oder Karborund in einer feinkörnigen Grundsubstanz, dadurch g e k e n n z e i c h n e t , daß die Korund- bzw. Karborundkörner angeschmolzen und miteinander verschweißt sind. 12. According to the method according to any one of claims 1 to 10 produced high-density shaped abrasive material with a granular abrasive material in the form of corundum and / or carborundum in a fine-grained base substance, thereby g e k e n n z e i c h n e t that the corundum or carborundum grains are melted and welded together.
PCT/EP1984/000187 1983-06-24 1984-06-22 Manufacturing of sintered ceramic moulded bodies WO1985000130A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833322889 DE3322889A1 (en) 1983-06-24 1983-06-24 PRODUCTION OF SINTER-CERAMIC MOLDED BODIES
DEP3322889.2 1983-06-24

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WO1985000130A1 true WO1985000130A1 (en) 1985-01-17

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DE (1) DE3322889A1 (en)
WO (1) WO1985000130A1 (en)

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US4965027A (en) * 1984-04-12 1990-10-23 Mitsubishi Corporation Method for the freeze-pressure molding of inorganic powders
WO1992005022A1 (en) * 1989-03-07 1992-04-02 United Technologies Corporation Manufacture of monolithic, stiff, lightweight ceramic articles
WO1995017287A1 (en) * 1993-12-20 1995-06-29 Saint Gobain/Norton Industrial Ceramics Corporation Molding shaped articles
DE10324828B4 (en) * 2003-05-26 2011-01-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Process for the production of ceramic or powder-metallurgical shaped bodies
CN114714264A (en) * 2022-04-22 2022-07-08 昆山耐信金刚石工具有限公司 Superhard CBN (cubic boron nitride) ceramic grinding wheel and preparation method thereof

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DE19527695A1 (en) * 1995-07-28 1997-01-30 Fraunhofer Ges Forschung Process for the production of ceramic or powder metallurgical components with a helical outer contour and ceramic or powder metallurgical component with a helical outer contour

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US2869215A (en) * 1955-06-20 1959-01-20 Robert S Smith Molding method
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Cited By (8)

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US4965027A (en) * 1984-04-12 1990-10-23 Mitsubishi Corporation Method for the freeze-pressure molding of inorganic powders
WO1992005022A1 (en) * 1989-03-07 1992-04-02 United Technologies Corporation Manufacture of monolithic, stiff, lightweight ceramic articles
AU649966B2 (en) * 1989-03-07 1994-06-09 United Technologies Corporation Manufacture of monolithic, stiff, lightweight ceramic articles
WO1995017287A1 (en) * 1993-12-20 1995-06-29 Saint Gobain/Norton Industrial Ceramics Corporation Molding shaped articles
AU680322B2 (en) * 1993-12-20 1997-07-24 Saint-Gobain/Norton Industrial Ceramics Corporation Molding shaped articles
DE10324828B4 (en) * 2003-05-26 2011-01-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Process for the production of ceramic or powder-metallurgical shaped bodies
CN114714264A (en) * 2022-04-22 2022-07-08 昆山耐信金刚石工具有限公司 Superhard CBN (cubic boron nitride) ceramic grinding wheel and preparation method thereof
CN114714264B (en) * 2022-04-22 2024-03-19 昆山耐信金刚石工具有限公司 Superhard CBN ceramic grinding wheel and preparation method thereof

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DE3322889A1 (en) 1985-01-17

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