摘要
以 Ti,Si C混合粉末作为预置合金涂层 ,采用 2 k W连续 Nd:YAG固体激光器进行激光熔覆处理 ,在 6 0 6 1铝合金表面借助于接触反应法制备原位自生 Ti C颗粒增强 Al- Ti复合材料涂层。试验结果表明 :采用合适的激光辐照工艺参数 ,可获得增强相 Ti C弥散分布 ,以 Ti- Al金属间化合物及 Al过饱和固溶体为主要组成相的复合材料熔覆层组织。Ti C颗粒与复合材料基体润湿良好 ,熔覆层结晶致密 ,与 6 0 6 1铝合金基材呈良好的冶金结合 。
Metal matrix composite (MMC) surface layer have been formed on 6061 aluminium alloy surface by laser cladding of using a 2kW continuous wave (CW) Nd YAG laser. The TiC particle reinforced Al Ti composite coating was prepared by in situ contact reaction with preplaced powder mixtures of Ti and SiC. The formation mechanism of TiC particles has been studied. It was found that composite coating consisting of TiC particles dispersed in coating matrix could be obtained using the correct ratio of Ti to SiC powders and a laser power density. Compound material cladding coating mainly consists of Ti Al intermetallic compound and Al supersaturated solid solution. The coating was characterized by good metallurgical bonding between the coating and the substrate, good wettability between the reinforcement TiC and the coating matrix,and a fine grain structure. The results show that the composite coating greatly enhances the surface hardness.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2001年第6期422-427,共6页
Rare Metal Materials and Engineering
基金
中国科学院院长特别基金资助
