Laser cladding wear resistance test
Time：
2019-09-23
来源：
激光熔覆是通过改变激光与粉末的作用过程，在熔池之上将粉末熔融或者半熔融，将熔融或者半熔融状态的液体流送入熔池内，从而实现熔覆效率和表面质量的提升，形成冶金结合的表面涂层。熔覆完的涂层表面可进行快速激光扫描，再次提高表面质量。高速激光熔覆工艺可提高工件表面耐磨、耐腐、耐热等性能，尤其是耐磨性的提高是比较重要的指标之一。
对于熔覆层耐磨性测试主要有以下几种方法：
1失重法即摩擦磨损试验
磨损前后的重量差来衡量耐磨性能，重量差越小则耐磨性越好，反之成立。测量时需要使用高精度的称量天秤。
在测试中，摩擦系数的测量是由试验机上直接读取摩擦力矩，并且用记录仪记录运动轨迹，然后利用测量的摩擦力矩计算摩擦系数。
2 尺寸变化测定法
使用螺旋测微器或者测微卡尺，测量磨损部位尺寸的变化量，比如工件为圆柱，测量磨损处的直径的变化量。
3表面形貌测量法
利用触诊式表面形貌测量仪（轮廓仪或台阶仪）可以测出磨损前后表面粗糙度的变化。
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What are the advantages of laser cladding over other cladding technologies?
Following the development of mechanised industry, and other cladding skills (such as spraying tungsten carbide, tungsten carbide spraying plasma spraying or arc welding) compared to laser cladding is a unique process, the use of which there are fundamental differences. With laser cladding, a highly concentrated heat source has a significant impact on the product. Because of its low heat input, high cure rate and accurate process control, laser cladding has many advantages.
Laser Applications in Silicon Carbide Semiconductor Wafer Processing
Silicon carbide is a high-performance third-generation semiconductor material with good optical properties, chemical inertness and excellent physical properties, including wide bandgap, high breakdown voltage, high thermal conductivity and high-temperature resistance, often used as a new generation of high-frequency, high-power device substrate materials, widely used in high-end manufacturing areas
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