摘要
为增强材料表面硬度和耐磨性,以Ti O2-Al-B4C-C作为粉末体系,利用激光熔覆技术在45#钢基材表面上制备了Ti C-Ti B2增强复合涂层,采用金相显微镜、扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度计和摩擦磨损试验机研究了不同含量的Ti O2-Al-B4C-C系合金粉末对涂层组织性能的影响。结果表明:复合涂层与基材冶金结合,无裂纹和气孔等缺陷,Ti C、Ti B2弥散分布于涂层中;随着Ti O2-Al-B4C-C系合金粉末含量的增加,涂层组织中Ti C、Ti B2及等轴晶的量逐渐增多;熔覆层的硬度也逐渐增加,当合金粉末含量为70Wt%时,熔覆层硬度最高,为基材的4倍。Ti O2-Al-B4C-C系合金粉末含量为50Wt%时,熔覆层磨损量最小。
In order to enhance surface hardness and wear resistance,this study employs Ti O2- Al- B4C- C as composite powder,and prepares Ti C- Ti B2 enhanced complex coating on the surface of 45 # steel substrate using laser cladding. The study also explores the impact of Ti O2- Al- B4C- C alloy powder of different components on the tissue morphology of the coating by using such devices as metallurgical microscope,scanning electron microscopy（ SEM）,X- ray diffraction（ XRD） and friction and wear testing machine. The results show that the metallurgical bonding of composite coating with the substrate is free of cracks and holes and other defects,with Ti C and Ti B2 distributing in the coating dispersively. With the increase of Ti O2- Al- B4C- C composite powder,the amount of Ti C、Ti B2 isometric crystal in the coating gradually rise,so does the hardness of the cladding layer. When the amount of alloy powder increases to 70Wt%,the hardness reaches the highest,which is 4 times as the substrate. While when the content of Ti O2- Al- B4C- C powder is 50Wt%,the cladding layer has the lowest wearing capacity.
出处
《现代机械》
2014年第6期87-90,共4页
Modern Machinery
基金
贵州大学SRT项目
编号(贵大SRT字(20)号)
