激光熔覆纳米碳化钨涂层组织和性能

The Microstructure and performance of Nano Tungsten Carbide Coating Prepared by Laser Cladding

采用7KW横流CO2激光器在2Cr13不锈钢基体上进行了激光熔覆纳米WC粉末的实验。使用扫描电镜(SEM)、X射线衍射(XRD)、X射线能量色散谱仪(EDAX)、显微硬度仪等设备检验了涂层的组织和性能。结果表明:采用激光熔覆纳米WC粉末的方法可以得到致密的复合涂层;涂层熔覆区呈现出典型的Fe的胞状树枝晶和树枝晶间的Fe-C-W组织;XRD分析表明,复合涂层主要由Fe、WC、W2C和Fe3C几种相组成;涂层的性能测试结果表明:表面硬度为1750HV,熔覆层平均硬度为1200HV,耐磨损性能比基体提高了2.5倍。

The experiments of laser cladding nanometer-size WC powder have been made on 2Crl3 stainless steel using 7kW COx laser processing system. The microstructure and mechanic performances of the coating were tested by SEM,XRD, EDAX,microhardness tester and other equipments. The results have shown that the cladding zone exhibits a dendritic plus reticular Fe-C-W solid solution structure. The XRD data reveal the composite coating consists of Fe, WC,W2C and Fe3C. The composite coating has good mechanic performances. The surface hardness of composite coating is about 1750 HV and the average hardness of cladding zone is about 1200 HV. The abrasion proof is 3.5 times as high as that of parent metal.