超音速火焰喷涂碳化物粒径不同的WC—10Co04Cr涂层在粗细磨粒下的磨损性能

改进的ASTM G65橡胶轮测试方法可采用220nm二氧化钛颗粒和368μm的砂粒分别在潮湿和干燥条件下使用。在由碳化物粒径不同（传统和亚微米）的两种粉末所制备的WC-CoCr涂层上开展试验,研究碳化物大小和磨损介质特性对涂层磨损性能的影响。采用扫描电镜对同一位置磨损前后的低倍和高倍形貌进行观察,并分析了涂层的磨损机理。结果表明：磨损机理取决于碳化物和磨粒的相对大小。在样品上进行磨损定量分析,通过调整碳化物尺寸可改善磨损性能,测试涂层的一些力学性能用于对比。

Behavior of HVOF WC-10Co4Cr Coatings with Different Carbide Size in Fine and Coarse Particle Abrasion Arash

A modified ASTM G 65 rubber wheel test was used in wet and dry conditions using 220 nm titania particles and 368 μm sand particles, respectively. Both tests were conducted on WC-CoCr coatings produced with two powders varying in carbide grain size; conventional and sub-micron, to address the effect of carbide size, as well as abrasive medium characteristics on the wear performance. The same spot with low and high magnification before and after abrasion wear test was analysed in detail using SEM to visualize wear mechanism. It was shown that the mechanism of the wear depends on the relative size of the carbide and abrasive particle. Quantitative analysis of wear also was done on the samples. By tailoring the carbide size the wear performance can be improved. Some of the mechanical properties of coatings were evaluated for comparison purposes.