Dimensionally-controlled ceramics

Details Dimensionally-controlled ceramics Dimensionally-controlled ceramics

1989-08-16

1990-09-18

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Dental

501119, 501 39, 501122, 501121, 261 65, 4331991, C04B 3518

Patent

active

049575546

ABSTRACT:
A moldable composiion comprising a mixture of magnesia, alumina, and silicon carbide powders or agglomerates thereof, the powders having an overall average size of at most 5.0 micrometers, preferably an average size in the range of 0.2 to 2.0 micrometers, optionally a polymeric binder, optionally a fluxing agent, and optionally a plasticizer or lubricant which exhibits litle or no controlled dimensional stability upon being fired to a cordierite ceramic material in a novel process. The process involves incorporation of silicon carbide powder into the moldable composition and the reaction of this silicon carbide upon firing to produce silicon dioxide. The cordierite ceramic material is useful where the dimensions of a shaped or molded part must be preserved after firing, as, for example, in the preparation of dental articles or as a mold for casting metals.

REFERENCES:
patent: 1546833 (1925-07-01), Geiger
patent: 3361583 (1968-01-01), Elarde et al.
patent: 3505278 (1970-04-01), Elarde et al.
patent: 3549393 (1970-12-01), Elarde et al.
patent: 4265669 (1981-05-01), Starling et al.
patent: 4568402 (1986-02-01), Ogawa et al.
patent: 4800180 (1989-01-01), McAllister
patent: 4810681 (1989-03-01), Hayakawa
Introduction to Ceramics, 2nd Edition, W. D. Kingery et al., John Wiley & Sons, New York (1976), pp. 368-374.
Ceramic Bulletin, 43 (5) 383-389 (1964).
Ceramic Engineering & Science Proceedings, 6 (1-2) 41-56 (1985).

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