Compositions: ceramic – Ceramic compositions – Refractory
Patent
1986-12-03
1988-01-12
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501 96, 501 98, 501151, C04B 3558, C04B 3550
Patent
active
047191872
ABSTRACT:
This invention is directed to the production of nitride-based ceramic bodies selected from the group of AlN and Si.sub.3 N.sub.4 which can be sintered to near theoretical densities at temperatures at least 200.degree. C. lower than those required for the pure materials. Such bodies are densified through the addition of a metal fluoride selected from the group of aluminum, barium, calcium, srtrontium, yttrium, the lanthanide rare earth metals, and mixtures thereof. Up to 80% by weight of said metal fluoride may be included but, generally, such additions will be held between 5-30% by weight. AlN bodies exhibiting very high thermal conductivity can be prepared by sintering with a metal fluoride selected from the group of barium, calcium, strontium, yttrium, the lanthanide rare earth metals, and mixtures thereof.
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Gauthier, G. et al., "Influence of Very Low Additions of CaO and Y.sub.2 O.sub.3 on the Densification of Aluminum Nitride by Hot-Pressing between 1650.degree. C. and 1750.degree. C.", C.R. Acad. Sc., Paris, t301, Serie II, No. 3, 1985, pp. 135-138 & Translation of 7 pages.
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Bardhan Pronob
Merkel Gregory A.
Bell Mark L.
Corning Glass Works
Janes, Jr. C. S.
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