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    钛合金表面激光熔覆Ti/Ni+ZrO2涂层的组织与性能

    Microstructure and Properties of Ti/Ni+ZrO2 Laser Cladding Layer on TA15 Titanium Alloy Surface

    • 摘要: 为提高TA15钛合金的表面硬度和耐磨性,采用激光熔覆方法在钛合金表面制备了Ti/Ni+5% ZrO2涂层(质量分数),并对其组织和性能进行了研究。结果表明:熔覆层与基体结合良好;熔覆层中除了有Ti2Ni和TiNi金属间化合物之外还有少量的单斜相氧化锆(m-ZrO2)和四方相氧化锆(t-ZrO2);熔覆层中主要生成相TiNi和Ti2Ni可以极大地提高熔覆层的耐磨性和硬度,ZrO2相在提高熔覆层韧性的同时,进一步提高了熔覆层的耐磨性和硬度。

       

      Abstract: In order to improve the surface hardness and wear resistance of TA15 titanium alloy, Ti/Ni+5% ZrO2 (mass fraction) coating was prepared by laser cladding method on the surface of TA15 titanium alloy. The microstructure and properties of the coating were studied. The results show that the cladding layer was well bonded with the substrate. Except of intermetallic compound Ti2Ni and TiNi, there were a small amount of monoclinic phase zirconia (m-ZrO2) and tetragonal phase zirconia (t-ZrO2) in the cladding layer. The wear resistance and hardness of the cladding layer were greatly improved by the phase of TiNi and Ti2Ni, and the toughness of the cladding layer was increased by ZrO2 phase which further increased the wear resistance and hardness of the cladding layer at the same time.

       

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