ムライトセラミックスの高温トライボロジー

概要

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Friction and wear tests from room temperature to 1000'C were carried out for two kinds of munite ceram ics, and compared with those of alumina ceramics. Sam ples prepared from the natural raw materials (M-1) and the sol gel method (M-2) were used. The former contained considerable amount of impurities and they formed glassy phase in the grain boundaries whereas the latter was highly pure and dense ceramics. No sig nificant change in either coefficient of friction or wear Ioss was observed against temperature in the M-1 material. In the M-2 material, the coefficient of fric tion was almost constant up to 600℃ but slightly in creased above that temperature. The specific wear Ioss, defined as the wear volume divided by the load and the wear distance, slightly increased from room temperature to 600℃ and then significantly decreased above 800℃ A film like region formed by very fine grains, which was similar to the one previously ob served in the alumina wear surface, was observed in the surface worn at 1000℃ The observed microstruc ture suggests that the surface film may be derived due to the plastic deformation of grains by dynarnic recrystallization during sliding under the shear stress field at high temperatures. A certain correlation between the wear loss and the fracture toughness K_<IC> was found although no correlation between the wear loss and hardness was found.
社団法人日本セラミックス協会の論文
1994-06-01