High-Temperature Tribological Performance of Vacuum Hot-Pressed NiCr Matrix Composite Containing SrAl12O19
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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.
Keywordselevated temperature SrAl12O19 tribological properties wear mechanism
The authors acknowledge the financial supports by the National Natural Science Foundation of China (Grant No. 51505378) and the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2017JM5101).
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