热喷涂过程氧化对钛合金/涂层结合性能的影响

Effect of oxidation process on binding properties of titanium alloy/coating during thermal spraying

通过探究热喷涂过程中钛合金的氧化机制,得出其对涂层/基体结合性能的影响。利用HOVF方法分别在不同处理状态下的钛合金表面制备WC涂层,对比两种试样的元素含量、显微组织和力学性能,分析氧化过程对涂层结合性能的影响。经EDS分析,喷砂过程对钛合金的氧化作用影响很小,基本可以忽略;而通过拉伸和弯折实验发现,喷涂过程对涂层/基体的氧化影响较大,导致最终的结合性能存在差异,结果显示喷涂过程中的氧化会造成涂层/基体结合性能下降。

By exploring the oxidation mechanism of titanium alloy during the thermal spray process, its effect on binding properties of the coating/substrate is obtained. Using the method of HVOF, WC coating on titanium alloy surface is prepared under different processing states. Comparing two samples＇ element contents, microstructures and mechanical properties, the effect of oxidation process on binding properties of titanium alloy/coating during thermal spraying is analysed. EDS analyses show that the sand blasting process has little effect on the oxidation of titanium and it can be ignored basically. By stretching and bending tests we find that oxidation in spraying process has a greater impact on the coating/substrate and leads to different binding properties finally. The results show that the oxidation during spraying process can cause degradation of combination performance of coating/ substrate.