中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心知识库

Nano-structured alumina (n-Al₂O₃) powders prepared by spray drying granulation and micro-structured alumina (m-Al₂O₃) powders by fused-crushed method were used to fabricate Al₂O₃ reinforced CuAl coatings. The microstructure and phase composition of the coatings were analyzed, and their tribological properties were investigated in comparison with those of the CuAl coating. In both CuAl/n-Al₂O₃ and CuAl/m-Al₂O₃ coatings, the reinforcing Al₂O₃ exists as well-flattened splats, and shows good interfacial compatibility with the bronze matrix. The alumina existed as amorphous and γ-Al₂O₃ phase in the CuAl/m-Al₂O₃ composite coating, while α-Al₂O₃ phase was contained in the CuAl/n-Al₂O₃ coating. Although the CuAl/n-Al₂O₃ composite coating gives a highest friction coefficient at all loads, it possesses superior wear-resistance as compared with the CuAl/m-Al₂O₃ coating and pure CuAl coating.