アルミナ-フッ化物系自己潤滑性複合材料の高温トライボロジー特性評価(S52-1 機素潤滑設計部門第10回卒業研究コンテスト(1),S52 機素潤滑設計部門第10回卒業研究コンテスト)

概要

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Al_2O_3-based self-lubricating composites have attracted much attention because they may be applicable to high-temperature mechanical elements. In this study, Al_2O_3-based self-lubricating composites containing CaF_2, LaF_3 and CeF_3 as solid lubricants and SiO_2 as a binder were prepared by spark plasma sintering (SPS), and their tribological properties were investigated using a SRV testing machine from room temperature to 800℃ in air. The tribological effects of Al_2O_3 grain size on the Al_2O_3-CaF_2-SiO_2 composites were also examined. It was shown that adding SiO_2 to the Al_2O_3-CaF_2 composites reduced their friction coefficients and wear rates above 600℃. The friction coefficients of the Al_2O_3-CaF_2-SiO_2 composites were also reduced from room temperature to 800℃ by increasing the Al_2O_3 grain size. Moreover, the Al_2O_3-CeF_3-SiO_2 composites showed low friction above 600℃ and low wear rates from room temperature to 600℃.
2004-09-04