铝合金表面激光熔覆SiC/金属基复合涂层的组织与性能研究

Study of Microstructure and Properties of the Laser Cladding of SiC/MMC on the Aluminum - Alloy

采用 ２ｋｗ的 Ｎｄ： ＹＡＧ激光器，在铝合金基体表面用预置法分别激光熔覆 ＮｉＣｒＡｌ／ＳｉＣｐ（颗粒）、ＮｉＣｏＣｒＡｌＹ／ＳｉＣｐ、ＮｉＣｏＣｒＡｌＹ／ＳｉＣｗ（晶须）复合粉末，获得了厚度约为 １ｍｍ的耐磨涂层。借助Ｘ射线衍射及电子探针，对不同涂层的显微组织作了对比分析，并测试了其显微硬度及耐磨性。结果表明由于细晶强化、固溶强化及未熔ＳｉＣ的弥散强化作用，与基体相比涂层硬度提高了４～５倍，耐磨性能提高了２～５倍。

By using a Nd: YAG laser of 2KW power, A wearing resistance clad layer on the aluminum - alloy has been achieved. The composite powder used includes NiCoCrAlY/SiCp (particle ), NiCoCrAlY/Sicw (whisker ), and NiCrAl/Sicp. Microstructure, micro - hardness and wearing resistance properties of the laser clad layers have been studied with the help of OM, SEM,XRD adn Sclerometer. The results show that the micro - hardness and wearing resistance properties have been enhanced greatly compared to the base aluminum alloy.