Abstract

The tribological properties of NiCr-30 wt.% Al₂O₃ (denoted by NC30A) composite with 4 wt.% SrCO₃ were investigated at different testing temperatures. The results indicated that the formation of SrAl₁₂O₁₉, which was derived from the solid-state reaction between SrO and Al₂O₃ in the sintering process had an impact on the friction coefficient and wear rate of NC30A composite. In the temperature range from 200 to 800 °C, the tribofilm containing SrAl₁₂O₁₉ and oxides (NiO, Cr₂O₃ and NiCr₂O₄) led to a decrease in the friction coefficient, while the detachment of Al₂O₃ grains and the oxidation of Ni on the worn surface endowed the sintered composite with a slightly higher wear rate.

中文翻译：

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含SrAl 12 O 19的真空热压NiCr基复合材料的高温摩擦学性能

摘要

在不同的测试温度下研究了NiCr-30 wt％Al ₂ O ₃（由NC30A表示）与4 wt％SrCO _3的复合材料的摩擦学性能。结果表明，烧结过程中SrO与Al ₂ O ₃固相反应生成的SrAl ₁₂ O ₁₉对NC30A复合材料的摩擦系数和磨损率有影响。在200至800°C的温度范围内，摩擦膜含有SrAl ₁₂ O ₁₉和氧化物（NiO，Cr ₂ O ₃和NiCr ₂ O ₄）导致摩擦系数降低，而Al ₂ O ₃晶粒的脱离和Ni在磨损表面上的氧化使烧结的复合材料的磨损率略高。