Synthesis of W_2C by Reactive Hot Pressing and Its Mechanical Properties
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Tungsten hemicarbide W<SUB>2</SUB>C with no or small amounts of W or WC was prepared by reaction-sintering from W and WC powders using a resistance-heated hot-pressing technique called spark plasma sintering. The product phases, density, microstructure, elastic moduli, hardness, and fracture toughness of the sintered bodies were determined. The stable region of the W<SUB>2</SUB>C phase had a narrow carbon content below 1860°C. W<SUB>2</SUB>C had a Poisson's ratio of 0.286, and its Young's modulus at zero porosity was determined to be 444 GPa from the true density and bulk density dependence. These values suggest that W<SUB>2</SUB>C has elastic deformation behavior similar to that of W.
- Materials Transactions, JIM
Materials Transactions, JIM 49(6), 1256-1261, 2008-06-01
The Japan Institute of Metals and Materials