TiC-TiB_2颗粒表面增强Ti-6Al-4V基复合材料涂层制备

Fabrication of a TiC-TiB_2 Particulate Reinforced Metal Matrix Composite Coating Formed on Ti-6Al-4V Alloy Surface

在Al-B4C粉末体系中通过采用低氧压熔结技术在Ti-6Al-4V合金表面成功制备出原位内生TiC-TiB2颗粒增强金属基复合材料涂层。XRD检测表明涂层主要由TiC、TiB2、TiAl3、Al2O3和Al组成,外层TiC和TiB2颗粒含量(体积分数)约为55%,各层之间表现出较强的结合能力。通过对涂层形成机制的研究,Al在涂层制备过程中主要起到类似稀释剂、催化剂、辅助剂、除氧剂和填充剂作用,为涂层的制备提供了一种更加便利的途径。

A metal matrix composite coating (MMCC)reinforced with an in situ synthezed TiC-TiB2 particulates has been fabricated successfully through the reaction of Ti in the substrate with Al and B4C in the slurry pasted on Ti-6Al-4V alloy by the low oxygen partial pressure fusing technique. XRD shows that the MMCC is composed of TiC, TiB2, TiAl3、Al2O3 and Al, and the volume fraction of ceramic TiC, TiB2 particulates in outer layer reaches appraoximately 55%. Meanwhile, the interfaces show a strong metallurigical bonding. It is believed that the aluminum serves not only as a diluent agent, activator agent and assistant agent, but also as a deoxidant agent and stuffing agent, providing a much easier route for TiC-TiB2 particulates formation in the fabrication of MMCC.