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为改进钛合金的耐磨性能,开发在高温环境、大温度落差条件下使用具有热应力缓和功能的新型涂层,应用激光技术在钛合金表面制备了钛基梯度功能耐磨涂层,分析了梯度层宏观形貌和微观组织,并测试了各主要元素梯度变化规律。结果表明,梯度层和基材实现良好冶金结合,白亮熔合线区宽度10～20μm。随着氧化铬含量的改变,各梯度层微观组织均发生变化。各层之间过渡缓和自然,平行间距均为0.3mm。第一层以等轴晶为主,第二层绝大多数为细化的球状、块状颗粒和少部分树枝状晶粒,第三层以枝晶为主。各元素SEM线扫描分布规律和理论设定规律总体趋势一致,符合梯度规律变化的理论要求。
In order to improve the wear resistance of titanium alloy, a new type of coating with thermal stress relieving function was developed under high-temperature environment and with large temperature drop. The titanium-based gradient function wear-resistant coating was prepared on the surface of titanium alloy by laser technique. Gradient layer macroscopic morphology and microstructure, and tested the main elements of the gradient variation. The results show that the gradient layer and the substrate achieve good metallurgical bonding, and the width of the white bright fused zone is 10 ~ 20μm. As the content of chromium oxide changes, the microstructure of each gradient layer changes. Natural transition between the layers of ease, parallel spacing are 0.3mm. The first layer is mainly equiaxed, the second layer is the most refined spherical, massive particles and a small number of dendritic grains, the third layer mainly dendrites. The SEM scanning distribution law of each element is consistent with the general trend of the theoretical setting rule, which meets the theoretical requirements of the gradient rule change.