HIP法によるTiB_2-Wサーメットの焼結と諸特性 [in Japanese] Sintering of TiB_2-W Cermets by HIP and their Properties [in Japanese]
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The purpose of this study is to investigate the formation of a new phase in TiB<SUB>2</SUB>-W cermets during HIP sintering and to evaluate the influence of this new phase on the mechanical properties. Green compacts of TiB<SUB>2</SUB>-W with compositions between 5 and 40vol%W were densified by HIP at a pressure of 200MPa and temperatures above 2023K, which yielded the cermets with a relative density of more than 99%. Analysis of these semples by XRD, EPMA and Auger, showed the presence of TiB<SUB>2</SUB>, β-WB and WTiB<SUB>2</SUB>, however no metallic W was detected between 5 and 30vol%W. The Vickers hardness, fracture toughness and Young's modulus increased with the formation of the WTiB<SUB>2</SUB> phase, and its volume fraction increased at W-rich compositions. The highest fracture toughness of 7.8MPam<SUB>1/2</SUB> and Young's modulus of 571GPa, were obtained for the TiB<SUB>2</SUB>-25vol%W composition. The Vickers hardness value of all specimens was above 20GPa. The fracture toughness values of the higher W compositions were greater than those of the lower W compositions.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 43(4), 515-519, 1996-04-15
Japan Society of Powder and Powder Metallurgy