Wear resistance of laser cladding coating onto titanium alloy substrate
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摘要: 为了提高钛合金的表面耐磨性能,采用MXP-2000型销盘式摩擦磨损实验机,以镍包石墨粉末为原材料,利用CO2激光器在TC4合金表面上熔覆耐磨涂层,进行钛合金及激光熔覆涂层的干摩擦磨损实验,并用扫描电镜对磨损表面进行观察和分析。实验结果表明,激光熔覆涂层的摩擦系数为0.56,与钛合金的摩擦系数基本相同,但激光熔覆涂层的磨损失重量比钛合金低接近一个数量级,说明激光熔覆涂层可以大大提高钛合金的表面耐磨性能。TC4合金的磨损机制以粘着磨损为主,激光熔覆涂层的磨损机制以磨粒磨损为主,涂层的高硬度加上涂层里的TiC增强相是其耐磨性高的主要原因。Abstract: In order to improve wear resistance of titanium alloy,a CO2 laser was used to clad coating onto TC4 alloy substrate with pre-placed nickel-coated graphite powder.An MXP-2000 type pin-on-disc wear tester was used to test the dry sliding friction behavior of titanium alloy and laser cladding coating.The morphology of worn surface was examined using a scanning electron microscope.The results of experiments indicate that the friction coefficient of laser cladding coating is 0.56,which is close to that of titanium alloy.Worn loss of the coating is one tenth of that of titanium alloy.It means that laser cladding coating can greatly improve wear resistance of titanium alloy.The wear mechanism of titanium alloy is adherence wear and the wear mechanism of laser cladding coating is particle wear.High hardness with TiC strengthen phase in it make the coating possess high wear resistance.
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Keywords:
- materials /
- wear resistance /
- laser cladding coating /
- nickel-coated graphite
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