等离子喷涂Al2O3-13wt．％TiO2涂层在干摩擦条件下的磨损机制转变图

The Wear Mechanisms Transition Map of Plasma Sprayed Al_2O_3-13wt.% TiO_2 Coating under Dry Sliding

研究了等离子喷涂Al2O3-13wt．％TiO2涂层／WC硬质合金在干摩擦条件下，载荷为10～100N和速度为0．1～0．5m／s范围内涂层的磨损行为，并通过对涂层磨损表面的显微分析，建立了这种涂层的磨损机制转变图．结果表明：等离子喷涂Al2O3-13wt．％TiO2涂层在低载荷低滑动速度条件下，即涂层的磨损率在0．1～1．0mg／m条件下，磨损机制主要是塑性变形和显微犁削；在中速中载下，即涂层的磨损率在1．0～3．0mg／m条件下，磨损机制主要是涂层的轻微断裂和颗粒剥落；在高速高载下，即涂层的磨损率在大于3．0mg／m的条件下，磨损机制主要是涂层的断裂和剥层．

The wear behavior of plasma sprayed Al2O3-13wt.%TiO2 coating against WC hard alloy has been investigated within a load range of 10 to 100 N and a sliding speed range of 0.1 to 0.5m/s under dry sliding. Through careful analysis of the worn surface of the coating, the wear mechanisms transition map of this coating has been established. As the result, the main wear mechanism of the coating is plastic deformation and microploug at low normal load and low sliding speed, that is, within the wear rate range of 0.1 to 1.0 mg/m of the coating. At intermediate normal load and intermediate sliding speed, that is, within the wear rate range of 1.0 to 3.0 mg/m of the coating, the main wear mechanism of the coating is microfracture and grain spalling. At high normal load and high sliding speed, that is, the wear rate of the coating is greater than 3.0 mg/m, the main wear mechanism of the coating is fracture and delamination.