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利用激光熔覆技术在工业纯钛表面分别预置TiC、(Ti+C)、(Ti+TiC)粉末制备了TiC增强Ti基复合涂层,对复合涂层的组织与性能进行了分析和测试。结果表明:制备的涂层均由TiC增强相和α-’Ti组成;激光熔覆纯TiC涂层出现了陶瓷的分层现象,对组织和性能不利;激光熔覆(Ti+C)原位反应生成了TiC,但组织较粗大;熔覆(Ti+TiC)组织均匀致密。三种熔覆层硬度大小关系为:加(Ti+TiC)>加TiC>加(Ti+C),最高硬度分别为Hv1246、Hv1213、Hv1135,加(Ti+TiC)涂层硬度最高。导致该熔覆层硬度最高的主要原因是添加的Ti对熔覆有利,且生成了数量较多、较致密均匀的硬质TiC陶瓷相。
TiC, (Ti + C) and (Ti + TiC) powders were prepared by laser cladding on the surface of commercial pure titanium and TiC reinforced Ti-based composite coatings were prepared. The microstructure and properties of the composite coatings were analyzed and tested . The results show that the prepared coatings are composed of TiC reinforced phase and α-TiT. Laser cladding pure TiC coating has the phenomenon of delamination of ceramic, which is unfavorable to microstructure and properties. The laser cladding (Ti + C) The reaction produced TiC, but the structure is coarse; the cladding (Ti + TiC) structure is uniform and compact. The relationship between the hardness of the three coatings is: Ti + TiC> TiC> Ti + C, and the highest hardness is Hv1246, Hv1213 and Hv1135, respectively. The main reason leading to the highest hardness of the cladding layer is that added Ti is favorable for cladding and produces a larger number of denser and uniform hard TiC ceramic phases.