Ti(C, N)-TiB2-MoSi2系セラミックスの焼結及び酸化

菖蒲 一久, 渡辺 忠彦

doi:10.2109/jcersj1950.95.1106_991

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: (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. (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. (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 K_IC of 3.7MPa·m^1/2.

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

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