激光熔覆层摩擦学特性的研究

Investigation on the Tribological Characteristic of Laser Clad Layer

为研究激光熔覆层的磨损性能，采用激光熔覆技术，在球墨铸铁材料表面制备原位析出颗粒增强金属基复合材料表层。以激光强化的球墨铸铁为上试样、灰铸铁为下试样，进行标准的SRV快速磨损试验。利用表面形貌仪测量配副双方的磨损深度，扫描电子显微镜（SEM）观察磨痕形貌。结果表明；激光熔覆强化层与灰铸铁配副，磨损深度分别为1．78μm、0．87μm，摩擦系数在0．067～0．085内变化，摩擦系数随摩擦时间的增加呈逐渐降低的趋势；磨损机制为微切削。

In order to investigate the tribological performance of laser clad coatings, laser cladding techniques were adopted. Fe-based composite layers reinforced by in situ particles were formed by laser cladding using preplaced FeCSiB alloy powders on nodular cast iron matrix. The Optimal SRV tests were carried out by using laser clad layers as upper samples and grey cast iron as low samples. The morphologies of worn scars were observed with optical microscopy and scanning electron microscopy（SEM）. The SRV tests show that laser cladding processes reduce the wear losses of wear couple,and have lower friction coefficient （0. 067 - 0. 085）, which reduces with the increase of wear time. The wear mechanism is micro-cutting that has light abrasive wear.