Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1994-01-05
1996-01-09
Jones, Deborah
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
C04B 3558
Patent
active
054829054
ABSTRACT:
An aluminum nitride sintered body comprising aluminum nitride crystals belonging to a Wurtzite hexagonal crystal system wherein the 3 axes a, b and c of the unit lattice of the crystal are defined such that the ratio b/a of the lengths of the axes b and a is 1.000 near the center of the crystal grain and lies within the range 0.997-1.003 in the vicinity of the grain boundary phase. Aluminum nitride sintered body is produced by sintering a molded body of a raw material powder having aluminum and nitrogen as its principal components at a temperature of 1700.degree.-1900.degree. C. in a non-oxidizing atmosphere having a partial pressure of carbon monoxide or carbon of not more than 200 ppm and then cooling the sintered body to 1500.degree. C. or a lower temperature at a rate of 5.degree. C./min or less. The aluminum nitride sintered body has a greatly improved thermal conductivity and, therefore, is suitable for heat slingers, substrates or the like for semiconductor devices.
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Matsuura Takahiro
Nakahata Seiji
Sogabe Kouichi
Yamakawa Akira
Bierman Jordan B.
Jones Deborah
Sumitomo Electric Industries Ltd.
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