Microstructure and Wear Properties of Cu–La2O3 Composites Prepared by Spark Plasma Sintering
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The Cu–La2O3 composite was prepared by internal oxidation method. The friction and wear behavior was examined under different applied load and sliding velocity according to ASTM G99 standard. The results showed the size of La2O3 particles was about 150 nm, which were homogeneous distributed in the Cu matrix. The mean size of Cu grains in the Cu–1.32 wt% La2O3 composite decreased by 60% compared with that of pure Cu. The ultimate tensile strength of the Cu–1.32 wt% La2O3 composite was 328 MPa. The dominant strengthening mechanisms were the grain size strengthening and thermal mismatch strengthening. The wear rate of Cu–1.32 wt% La2O3 composites was lower than that of pure copper and it increased with the increase of applied load and sliding velocity. The mild to severe wear transition appeared at different load and velocity. The wear mechanisms were abrasive wear and oxidative wear in mild wear. However, it changed to plastic deformation and delamination wear in severe wear.
KeywordsSpark plasma sintering Cu–La2O3 composite Wear mechanism Delamination wear
This research was funded by the National Natural Science Foundation of China [Grant Number 51604075].
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