TiC添加量对TA15激光熔覆复合涂层的组织及性能的影响

    Effects of TiC Addition Amount on Microstructure and Properties of TA15 Laser Cladding Composite Coating

    • 摘要: 为了解决TA15钛合金耐磨性差、易粘着的问题,采用激光熔覆技术在TA15基材上制备了TA15-TiC钛合金-陶瓷激光熔覆复合涂层。结果表明:熔覆层物相主要由α'-Ti、β-Ti和TiC组成。随着TiC陶瓷颗粒熔覆量的增加,析出的TiC形貌从羽毛状、链条状向树枝状、花瓣状转变,当TiC熔覆量达到20%时,析出类球状的TiC组织。有效的TiC相析出以及稳定的类球状TiC存在能有效提升熔覆层的性能。当加入20wt%TiC时,熔覆层具有最好的耐磨性,硬度可达600.4 HV0.5,硬度是基材的1.5倍;磨损率为0.89×10-8 mm3/(N·m),耐磨性是基材的9.3倍。

       

      Abstract: In order to solve the problems of poor wear resistance and easy adhesion of TA15 titanium alloy, laser cladding technology was used to prepare TA15-TiC titanium alloy-ceramic laser cladding composite coating on TA15 substrate. The results show that, the phase of the cladding layer is mainly composed of α'-Ti, β-Ti and TiC. As the cladding amount of TiC ceramic particles increases, the morphology of the precipitated TiC changes from feather-like and chain-like to dendritic and petal-like. When the TiC cladding amount reaches 20%, a spherical TiC structure is precipitated. Effective TiC phase precipitation and the existence of stable spherical TiC can effectively improve the performance of the cladding layer. When 20 wt% TiC is added, the cladding layer has the best wear resistance, with a hardness up to 600.4 HV0.5, which is 1.5 times that of the base material; the wear rate is 0.89×10-8 mm3/(N·m), and the wear resistance is 9.3 times that of the base material.

       

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