Compositions: ceramic – Ceramic compositions – Refractory
Patent
1984-03-12
1986-10-21
Williams, Howard S.
Compositions: ceramic
Ceramic compositions
Refractory
264 61, 264 66, 423412, C04B 3558, F27D 706
Patent
active
046185925
ABSTRACT:
A fine powder of aluminum nitride having an average particle diameter of not more than 2 microns and comprising at least 94% by weight of aluminum nitride, at most 3% by weight of bound oxygen and at most 0.5% by weight as metal of metal compounds as impurities.
The fine aluminum nitride powder is prepared from a fine alumina powder and a fine carbon powder as starting materials.
The fine aluminum nitride powder provides a sintered body having a high purity and a high density such as at least 2.9 g/cm.sup.3.
The fine aluminum nitride powder is also useful as a raw material for alpha-Sialon, beta-Sialon and AlN polytypes, as an addition aid in various ceramics.
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patent: 3108887 (1963-10-01), Lenie et al.
patent: 3572992 (1971-03-01), Komeya et al.
patent: 3718490 (1973-02-01), Morgan et al.
Aluminum Nitride, Engineered Materials, division of Hi-Purity Materials, Inc., N.Y., N.Y.-Jun., 1981.
Mat. Sci. Res. 13, 321-332 (1980), Sintering of Aluminum Nitride.
Publication Yogyo Kyokai Shi, 82[3], 181-183 (1974).
Publication Yogyo Kyokai Shi, 89[6], 58-64 (1981).
Kuramoto Nobuyuki
Taniguchi Hitofumi
Tokuyama Soda Kabushiki Kaisha
Williams Howard S.
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