通过激光熔覆不同比例TA15与Cr_3C_2的混和粉末,在TA15钛合金表面制备出原位钛基复合材料涂层,分析了涂层的组织、相组成、硬度及界面结合情况.研究表明,激光熔覆过程中,Cr3 C2颗粒溶解并与Ti发生反应,在涂层中形成弥散分布的TiC;随原始粉末中Cr_3C_2添加量的增加,涂层中TiC含量及涂层硬度增加,TiC有等轴颗粒状及枝晶两种形貌;涂层组织致密,与基体呈完全冶金结合,涂层内TiC与钛合金基体界面结合良好,经弯曲及热震试验后,涂层未出现剥落现象,表明涂层与基体具有很好的相容性.
In-situ titanium matrix composite coatings were prepared on TA15 titanium alloy surface by laser cladding pre-mixed TA15 and Cr_3C_2 powders with different ratio.The microstructure, hardness as well as the interface bonding of the coating were investigated.The results show that during cladding original Cr_3C_2 particulates dissolve, react with Ti and form dispersed TiC in the clad coatings.With increase the ratio of Cr_3C_2 in the pre-mixed powders, the amount of TiC within the coatings and the coatings hardness increase.The formed TiC appears as particulate and dendrite.The coating is dense and metallurgically bonded to the substrate.The interface between the in-situ formed TiC and the titanium alloy matrix is perfect.No de-bonding is obsewed for the composite coatings after bending and thermal shock tests, indicating a good compatibility of the composite coatings with the titanium alloy substrate.
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