Dense shaped articles of polycrystalline .alpha.-silicon carbide

Details Dense shaped articles of polycrystalline .alpha.-silicon carbide Dense shaped articles of polycrystalline .alpha.-silicon carbide

1983-06-23

1984-08-21

Derrington, James H.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

264 65, 264 85, 501 89, C04B 3536

Patent

active

044670435

ABSTRACT:
The invention relates to dense shaped articles of polycrystalline .alpha.-silicon carbide containing from 0.1 to 0.4%, by weight, of aluminum and optionally, a small amount of nitrogen and/or phosphorus, having a homogeneous virtually single-phase microstructure. The additional constituents are substantially in the form of a solid solution in the .alpha.-SiC lattice. The shaped articles are distinguished by flexural strength of at least 600 N/mm.sup.2 up to 1450.degree. C. and low subcritical crack propagation under mechanical stress. The fracture mechanism is trans granular up to at least 1450.degree. C. The shaped articles are manufactured by simultaneously shaping and hot pressing pulverulent .alpha.-silicon carbide containing a small amount of an aluminum-containing additive, such as aluminum powder, aluminum nitride and/or aluminum phosphide, at temperatures between 1850.degree. C. and 2300.degree. C. under a pressure of at least 100 bar (10 MPa).

REFERENCES:
patent: 3836673 (1974-09-01), Weaver et al.
patent: 4135937 (1979-01-01), Murata et al.
patent: 4230497 (1980-10-01), Schwetz

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