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使用 5k W CO2 激光器对铝合金表面的 Ni- Cr- Al涂层进行熔覆处理 .分析发现 ,熔覆层中存在大量的非晶组织 .利用差热分析 DTA 方法半定量地确定非晶组织的含量 ,并对不同非晶含量的试样与灰铸铁进行摩擦磨损试验 .结果表明 ,激光熔覆试样的磨损量非常小 ,非晶含量越高 ,磨损量越小 .激光熔覆试样的摩擦系数在油润滑条件下相差不大 ,灰铸铁的摩擦系数在磨程 2 km后趋于稳定 ,且均小于 0 .1
The Ni-Cr-Al coating on the aluminum alloy was cladded with a 5kW CO2 laser, and a large amount of amorphous structure was found in the coating.DTA method was used to semi-quantitatively determine the amorphous structure And the friction and wear tests of gray cast iron with different amorphous content were carried out.The results show that the wear amount of laser cladding specimen is very small and the higher the amorphous content is, The friction coefficient is not much different under the conditions of oil lubrication, the friction coefficient of gray cast iron tends to be stable after 2 km of grinding process, and both are less than 0.1