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US 12,060,302 B2Granted
Crystalline silicon carbide fiber and method for manufacturing same, and ceramic composite substrate
AssigneeUbe Corporation
InventorsYuusuke Tominaga, Hiroyuki Yamaoka, Kouichirou Suyama, Hideki Ozawa, Mao Sumino
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Abstract
A crystalline silicon carbide fiber containing silicon carbide and boron nitride, the crystalline silicon carbide fiber having a content of Si of 64% to 72% by weight, a content of C of 28% to 35% by weight, and a content of B of 0.1% to 3.0% by weight, and including, at a surface portion, a composition gradient layer in which a content of silicon carbide increases while a content of boron nitride decreases toward a depth direction.
Claims22
A crystalline silicon carbide fiber comprising:
- silicon carbide;
- and
- boron nitride;
- the crystalline silicon carbide fiber having a content of Si of 64% to 72% by weight, a content of C of 28% to 35% by weight, a content of B of 0.1% to 3.0% by weight, and a content of Ti of less than 0.1% by weight, and
- the crystalline silicon carbide fiber including, at a surface portion, a composition gradient layer in which a content of silicon carbide increases while a content of boron nitride decreases toward a depth direction.
2 more elements
A method for manufacturing a crystalline silicon carbide fiber, the method comprising:
- a calcination step of heating an amorphous silicon carbide fiber containing boron to 1550° ° C. to 2200° C. in an inert atmosphere including nitrogen and thereby forming, at a surface portion, a composition gradient layer in which a content of silicon carbide increases while a content of boron nitride decreases toward a depth direction;
- wherein the content of Si is 64% to 72% by weight, the content of C is 28% to 35% by weight, the content of B is 0.1% to 3.0% by weight, and a content of Ti is less than 0.1% by weight.
Dependencies are inferred from the claim text.