Sintering and Oxidation of Ti(C, N)-TiB<sub>2</sub>-MoSi<sub>2</sub> Composites

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  • Ti(C, N)-TiB<sub>2</sub>-MoSi<sub>2</sub>系セラミックスの焼結及び酸化
  • Ti C N TiB2 MoSi2ケイ セラミックス ノ ショウケツ オヨビ

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Abstract

Ternary composite of Ti(C, N), TiB2 and MoSi2 was studied in order to improve the oxidation resistance of Ti(C, N)-TiB2 composites. The following conclusions were obtained:<br>(1) Fully densified and strong compacts were obtained for the compositions of Ti(C, N)-TiB2-MoSi2 with Ti(C, N) less than 80wt%, TiB2 less than 80wt%, and MoSi2 less than 60wt%, by sintering above 2023K for raw powders of about 1μm.<br>(2) With a small Ti(C, N) content for all Ti(C, N) grains to be surrounded by TiB2 and MoSi2 grains, and with MoSi2 content more than 20wt%, good oxidation resistance was observed above 1273K because a compact surface film of rutile and silicate glass was formed by oxidation, which worked as an oxidation-resistant layer. This layer was porous in the initial stage, but became dense after a sufficient amount of silicate glass was produced. The silicate glass was found to have flowed from the inner reacting sublayers to the outer sublayers.<br>(3) TiB2-20wt% MoSi2 composite sintered at 2073K in vacuum, resistant against oxidation, was found to have the bending strength of 600MPa, the Vickers hardness of 2100, and the fracture toughness KIC of 3.7MPa·m1/2.

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