Substantially pore free sintered polycrystalline articles of...

Details Substantially pore free sintered polycrystalline articles of... Substantially pore free sintered polycrystalline articles of...

C - Chemistry, Metallurgy

04

B

25/133, 261/6

C04B 35/56 (2006.01) C04B 35/563 (2006.01) C04B 35/575 (2006.01)

Patent

CA 1201730

ABSTRACT SUBSTANTIALLY PORE-FREE SINTERED POLYCRYSTALLINE ARTICLES CONSISTING OF ?-SILICON CARBIDE, BORON CARBIDE AND FREE CARBON, AND PROCESS FOR THEIR MANUFACTURE The invention provides substantially pore-free sintered polycrystalline articles comprising -silicon carbide, boron carbide and free carbon, the quantitative proportions of which, in percent by weight, are defined by the trapezoidal area having, in the ternary system B/Si/C of Fig. 1 the corner points Image The articles have a density of at least 99% of the theor- etical density, an average structural grain size of less than 20 µm and a 4-point flexural strength of at least 400 N/mm2. They are manufactured from fine-grained mixtures of ?-silicon carbide, boron carbide, carbon and or material that can be coked to form carbon, in a two-stage sintering process. In the first stage, green bodies preshaped from the powder are subjected to pressureless sintering to a density of at least 95% TD at from 1950 to 2150°C. In the second stage, the sintered articles are subjected to a post-densification to a density of at least 99% TD, by isostatic hot pressing, without encapsulating, at from 1850 to 2150°C in a high- pressure autoclave under a gas pressure of at least 10 MPa.

428033

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