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US 5,510,304 AGranted
Coarse reaction bonded silicon nitride
AssigneeSaint-Gobain/Norton Industrial Ceramic Corporation
InventorCraig A. Willkens
Life of this patent
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Abstract
A ceramic comprising: a) between 20 w/o and 90 w/o unnecked composite grains comprising: i) between 5 w/o and 100 w/o silicon nitride, and ii)between 0 w/o and 95 w/o free silicon, said composite grains having lengths of at least 50 microns and widths of at least 10 microns, and b) between 10 w/o and 80 w/o matrix grains having lengths of less than 20 microns.
Claims21
A reaction bonded silicon nitride ceramic comprising:
- a) between 20 w/o and 90 w/o unnecked composite grains comprising:
- i) between 5 w/o and 100 w/o silicon nitride, and
- ii)between 0 w/o and 95 w/o free silicon, said composite grains having lengths of at least 50 microns and widths of at least 10 microns, and
- b) between 10 w/o and 80 w/o matrix grains having lengths of less than 20 microns.
1 more element
Dependencies are inferred from the claim text.