几种等离子涂层在蒸馏水润滑下的摩擦学特性

研究了等离子喷涂Cr₃C₂-NiCr、WC-Co和Cr₂O₃涂层自配对以及Cr₂O₃涂层与WC＋Co硬质合金和增韧SiC陶瓷配对在蒸馏水润滑下的摩擦学特性．结果发现：三种涂层自配对组成摩擦副在水润滑下，以Cr₂O₃涂层的耐磨性能最好，显示出＜10^-6mm³N^-1m^-1的磨损系数；三种涂层的磨损机理均主要表现为裂纹扩展和颗粒断裂，涂层的断裂韧性越高，气孔率和微裂纹长度越低，其耐磨性能越好．异质材料配对能有效地改善Cr₂O₃涂层的摩擦学特性，这主要与摩擦副材料的表面状态及摩擦化学反应有关．

Tribological Properties of Plasma-Sprayed Coatings Under Water-Lubricated Sliding

Tribological properties of plasma-sprayed self-mated Cr3C2-NiCr, WC-Co and Cr2O3 coatings and the Cr2O3 coating against WC Co hard alloy and toughened SiC ceramics were investigated under water-lubricated sliding. It was found that Cr2O3 coating was the most wear-resistant among the three kinds of self-mated coatings and had a wear coefficient less than 10-6mm3N-1m-1. Wear mechanisms of the coatings were explained in terms of microcracking and grain fracturing. The higher the fracture toughness, and the lower the porosity and the length of microcrack of the coating, the more wear-resistant the coating was. The friction coefficient and wear coefficient of Cr2O3 coating were obviously reduced when it was mated to WC Co hard alloy and toughened SiC ceramics, which may be related to surface condition and tribochemical reaction of material of friction pair.