Mechanical Properties of Reactively Processed W/Ta₂C-based Composites
The mechanical properties of reactively processed W/Ta2C cermet composites were studied. Dense W/Ta2C cermets with a nominal composition of 40.4 vol% W(Ta)ss, 48.9 vol% Ta2C and 10.6 vol% Ta2WO8 were fabricated using a pressureless reactive processing method. Four-point bend strength, fracture toughness, elastic modulus, and microhardness were measured at room temperature. The average flexure strength was 584MPa which is lower than for pure W; however the strength of pure Ta2C is unknown. The fracture toughness was 8.3MPam1/2 which fits a rule of mixtures between literature values for the fracture toughness of the W and Ta2C phases. The elastic modulus was 476GPa, and the microhardness was 13.4GPa. Both Young's modulus and hardness were higher than values reported for other W-based cermets.
M. C. Teague et al., "Mechanical Properties of Reactively Processed W/Ta₂C-based Composites," Journal of the European Ceramic Society, Elsevier, Aug 2010.
The definitive version is available at http://dx.doi.org/10.1016/j.jeurceramsoc.2010.02.006
Materials Science and Engineering
Keywords and Phrases
Cermets; Composites; Mechanical Properties; Carbides
Article - Journal
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