Zirconium Carbide-Tungsten Cermets Prepared by In Situ Reaction Sintering
Zirconium carbide-tungsten (ZrC-W) cermets were prepared by a novel in situ reaction sintering process. Compacted stoichiometric zirconium oxide (ZrO2) and tungsten carbide (WC) powders were heated to 2100⁰C, which produced cermets with 35 vol% ZrC and 65 vol% W consisting of an interpenetrating-type microstructure with a relative density of ~95%. The cermets had an elastic modulus of 274 GPa, a fracture toughness of 8.3 MPa·m1/2, and a flexural strength of 402 MPa. The ZrC content could be increased by adding excess ZrC or ZrO2 and carbon to the precursors, which increased the density to >98%. The solid-state reaction between WC and ZrO2 and W-ZrC solid solution were also studied thermodynamically and experimentally.
S. C. Zhang et al., "Zirconium Carbide-Tungsten Cermets Prepared by In Situ Reaction Sintering," Journal of the American Ceramic Society, vol. 90, no. 6, pp. 1930-1933, Wiley-Blackwell, Jun 2007.
The definitive version is available at http://dx.doi.org/10.1111/j.1551-2916.2007.01642.x
Materials Science and Engineering
Keywords and Phrases
In situ reaction sintering; Relative density; Tungsten carbide powders; Density (specific gravity); Elastic moduli; Microstructure; Sintering; Solid solutions; Zirconia; Cermets
International Standard Serial Number (ISSN)
Article - Journal
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