高铝铜合金粉末激光熔覆层的摩擦磨损性能

Friction and wear properties of laser melt-cladding with high-aluminum bronze powders

采用激光熔覆技术在A3钢基体上用高铝铜合金粉末制备熔覆层.利用电子探针、X射线衍射、扫描电镜、UMT摩擦试验机研究该熔覆层的组织和摩擦磨损性能.结果表明,该熔覆层主要组成相为β′+α+K,熔覆层组织均匀致密,其中硬质K相弥散分布于熔覆层组织中,显著提高了熔覆层的摩擦磨损性能;在边界润滑条件下,熔覆层有良好的耐摩擦磨损性能,其主要磨损形式是:磨粒磨损,粘着磨损和疲劳磨损,且高频摩擦条件下的耐摩擦磨损性能要优于低频摩擦条件下的耐摩擦磨损性能.

The melt-coating of high-aluminum bronze powder was obtained on surface of A3 steel with laser melt-cladding technique. Electron probe micro-analyzer, X-ray diffraction, scanning electron micro- scope, and UMT friction machine were used to investigate the microstructure and friction-wear properties of the coating film. The results showed that the coating microstructure was mainly formed with the phases of β＇ ＋α＋K, being uniform, fine, and compact. Because of the phase K uniformly dispersed in the grain, the coatings＇ wear resistance increased significantly. Under boundary lubrication conditions, the coatings exhibited a good wear resistance performance, and the main wear mechanism was composed of abrasive wear,adhesion wear, and fatigue wear. In case of friction with high frequency, the coatings＇ wear resistance property was superior to that with low frequency.