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US 5,179,050 AGranted
Sic-based pressureless sintered product
AssigneeKabushiki Kaisha Toshiba
InventorsToshiaki Mizutani, Akihiko Tsuge
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Abstract
An SiC-based pressureless sintered product contains a sintered product main component containing grains of at least one additive selected from the group consisting of Tac, NbB.sub.2, VB.sub.2 and WB and the balance of SiC sintered grains constituting a SiC matrix, and a sintering assistant component. The additive grains have a maximum grain size not greater than an average grain size of the SiC sintered grains.
Claims14
A SiC-based pressureless sintered product, comprising:
- a sintered product main component containing grains of at least one additive selected from the group consisting of TaC in an amount of 0.06 to 15 mol %, and NbB.sub.2, VB.sub.2 and WB each in an amount of 0.06 to 25 mol %, and in the event of a combination of TaC with a boride, the total amount of additive ranging from 0.06 to 25 mol %, and the balance of SiC sintered grains constituting a SiC matrix;
- and
- a sintering assistant containing B and C components;
- said additive grains having a maximum grain size not greater than the average grain size of the SiC sintered grains, said sintered product having a density of at least 90% of its theoretical density and having a residual oxygen content of 0.2 atomic percent or less, based on the main component.
1 more element
Dependencies are inferred from the claim text.