火焰喷涂PA1010／n-SiO2复合涂层干摩擦磨损性能

Tribological Behavior of Flame-sprayed PA1010/n-SiO_2 Composite Coatings

利用火焰喷涂法制备PA1010/n-SiO_2复合涂层,并采用均匀试验设计方法研究涂层在干摩擦条件下同GCr15钢环配副时的摩擦学性能;利用SPSS 12.0统计软件对试验结果进行回归分析,建立涂层摩擦系数和磨损质量损失同pv值(摩擦载荷与摩擦速度的乘积)相关性的数学模型;利用示差扫描量热仪(Differential scanning calorimetry,DSC)和扫描电子显微镜(Scanning electron microscope,SEM)对复合涂层的热性能和磨损表面形貌进行分析。结果表明,n-SiO_2的加入能明显提高涂层的结晶性能、耐磨性能。当n-SiO_2含量为1.5%时,复合涂层摩擦磨损性能最佳,在试验条件下磨损质量损失降低近4倍,摩擦因数降低23%,跑合期缩短44%,复合涂层与GCr15钢环对磨时的磨损机理主要为疲劳磨损和轻微的粘附磨损。

To investigate the effects of n-SiO2 on the tribological behavior of flame spray PA1010 composite coatings, the tribological properties of the PA1010/n-SiO2 composite coatings are examined by using a MRH-3 friction and wear tester. The statistical regression analysis of the experimental results are performed by using SPSS 12.0 software for Windows. The results show that PA1010/n-SiO2 composite coatings present better friction resistance than pure PA1010 coating. Based on the morphological observation of the worn surfaces, the possible wear mechanism is discussed. The result shows that n-SiO2 particles make the composite coatings increased the wear resistance of the PA1010 matrix. When the coating contains 1.5% n-SiO2, the best wear resistance of the coating is obtained. The composite coatings are dominated by plastic deformation, plough marks and adhesion wear as they slid against the steel ring in dry ambient condition.