EP0156809A1 - Fabrication de corps de formage en ceramique frittee - Google Patents

Fabrication de corps de formage en ceramique frittee

Info

Publication number
EP0156809A1
EP0156809A1 EP19840902514 EP84902514A EP0156809A1 EP 0156809 A1 EP0156809 A1 EP 0156809A1 EP 19840902514 EP19840902514 EP 19840902514 EP 84902514 A EP84902514 A EP 84902514A EP 0156809 A1 EP0156809 A1 EP 0156809A1
Authority
EP
European Patent Office
Prior art keywords
mixture
mold
abrasive material
corundum
carborundum
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Withdrawn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
EP19840902514
Other languages
German (de)
English (en)
Inventor
Udo Rieser
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0156809A1 publication Critical patent/EP0156809A1/fr
Withdrawn legal-status Critical Current

Links

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.

Landscapes

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

Abstract

Pour la fabrication de corps de formage en céramique frittée et en particulier de corps de formage en matériau abrasif avec inclusion d'un matériau abrasif comparativement à gros grains comme par exemple le corindon ou le carborundum, un mélange aqueux du matériau brut en question est coulé dans un moule par exemple en caoutchouc, puis y est refroidi et en est démoulé. Le mélange refroidi moulé est soumis à un processus de lyophilisation avant d'être cuit. S'est avéré particulièrement adéquat pour un corps de formage en matériau abrasif, un mélange composé (par rapport au mélange sec) d'environ 70% en poids de corindon raffiné dont la grosseur des grains varie entre 50 et 280 meshs et d'une substance de base formée essentiellement d'alpha-oxyde d'aluminium pulvérulent avec addition de feldspath potassique, de silicate de zircon et de dextrine, et doté d'une température de frittage de 1770oC (2043oK).
EP19840902514 1983-06-24 1984-06-22 Fabrication de corps de formage en ceramique frittee Withdrawn EP0156809A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833322889 DE3322889A1 (de) 1983-06-24 1983-06-24 Herstellung sinterkeramischer formkoerper
DE3322889 1983-06-24

Publications (1)

Publication Number Publication Date
EP0156809A1 true EP0156809A1 (fr) 1985-10-09

Family

ID=6202356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840902514 Withdrawn EP0156809A1 (fr) 1983-06-24 1984-06-22 Fabrication de corps de formage en ceramique frittee

Country Status (3)

Country Link
EP (1) EP0156809A1 (fr)
DE (1) DE3322889A1 (fr)
WO (1) WO1985000130A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60217106A (ja) * 1984-04-12 1985-10-30 高橋　信之 無機粉末凍結成形法
US4975225A (en) * 1989-03-07 1990-12-04 United Technologies Corporation Manufacture of monolithic, stiff, lightweight ceramic articles
US5409645A (en) * 1993-12-20 1995-04-25 Saint Gobain/Norton Industrial Ceramics Corp. Molding shaped articles
DE19527695A1 (de) * 1995-07-28 1997-01-30 Fraunhofer Ges Forschung Verfahren zur Herstellung von keramischen oder pulvermetallurgischen Bauteilen mit einer schraubenförmigen Außenkontur und keramisches oder pulvermetallurgisches Bauteil mit schraubenförmiger Außenkontur
DE10324828B4 (de) * 2003-05-26 2011-01-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung keramischer oder pulvermatallurgischer geformter Körper
CN114714264B (zh) * 2022-04-22 2024-03-19 昆山耐信金刚石工具有限公司 超硬cbn陶瓷砂轮及其制备方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1924597A (en) * 1929-02-14 1933-08-29 Libbey Owens Ford Glass Co Glass surfacing tool
US2765512A (en) * 1950-07-13 1956-10-09 Robert A Nesbit Formation of ceramic, etc., articles
US2893102A (en) * 1954-01-07 1959-07-07 William A Maxwell Article fabrication from powders
US2869215A (en) * 1955-06-20 1959-01-20 Robert S Smith Molding method
US2986455A (en) * 1958-02-21 1961-05-30 Carborundum Co Bonded abrasive articles
US3079243A (en) * 1959-10-19 1963-02-26 Norton Co Abrasive grain
US3309183A (en) * 1965-08-13 1967-03-14 Carbond Corp Abrasive tools and methods of making such tools
DE2130360A1 (de) * 1970-07-07 1972-01-20 Wedgwood Ltd Verfahren zur Herstellung keramischer Werkstuecke auf Tonbasis
US4341725A (en) * 1977-12-13 1982-07-27 Weaver Gerald Q Molding refractory and metal shapes by slip-casting
FR2456925A2 (fr) * 1979-02-07 1980-12-12 Anvar Procede perfectionne de lyophilisation d'un produit prealablement congele
CA1161238A (fr) * 1979-03-02 1984-01-31 Robert Smith-Johannsen Corps composites en matiere inorganique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8500130A1 *

Also Published As

Publication number Publication date
DE3322889A1 (de) 1985-01-17
WO1985000130A1 (fr) 1985-01-17

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Effective date: 19850529