HIP焼結TiB_2の強度およびじん性に及ぼす酸化の影響

概要

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Fracture strength and fracture toughness tests were carried out on HIP-sintered TiB_2 specimens at elevated temperatures and the mechanisms of strengthening and toughening by oxidation at elevated temperatures were investigated. Both the fracture strength and fracture tougness of TiB_2 increased with increasing temperature up to 800〜1100 K and then decreased. the room-temperature strength of the specimens heated at elevated temperatures showed a similar temperature dependence of high-temperature strength. The mechanism of strengthening of the oxidized TiB_2 seems to be as follows. when the TiB_2 specimen is heated, the volumetric expansion due to the oxidation reaction of TiC→TiO_2, where TiC is used as a sintering additive, occurs. This volumetric expansion near the surface oxidized region creates the residual compressive stress, which increases the strength and the fracture toughness.
社団法人日本材料学会の論文
1990-06-15