Dense sintered shaped articles of polycrystalline...

Details Dense sintered shaped articles of polycrystalline... Dense sintered shaped articles of polycrystalline...

C - Chemistry, Metallurgy

04

B

25/128, 261/6

C04B 35/56 (2006.01) C04B 35/565 (2006.01)

Patent

CA 1138901

ABSTRACT OF THE DISCLOSURE There are provided shaped articles of polycrystalline silicon carbide having densities of at least 97% and improved mechanical properties particularly at high temperatures, said articles consisting of at least 95.4% by weight of .alpha.-silicon carbide, about 0.1 to 2.0% by weight of additional carbon, about 0.2 to 2.0% by weight of aluminium, about 0 to 0.5% by weight of nitrogen, and about 0 to 0.1% by weight of oxygen, the .alpha.-silicon carbide being in the form of a homogeneous micro- structure with an average grain size of less than 10 µm. There is also provided a process for the preparation of such articles by pressureless sintering submicron powder compacts consisting of .alpha.-silicon carbide and aluminium- and carbon containing additives as sintering aids.

322450

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