等离子束表面冶金原位颗粒增强TiC复合超厚涂层研究  

In-Situ Synthesis of TiC Particle Reinforced Fe Base Alloy Composite Ultra-thick Coating by Plasma Jet Surface Metallurgy

作　　者：陈颢[1,2] 羊建高[2] 陈米宋[1] 

机构地区：[1]江西理工大学,江西赣州341000 [2]钨资源高效开发及应用技术教育部工程中心,江西赣州341000

出　　处：《稀有金属材料与工程》2011年第S2期365-368,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50801032);江西省教育厅基金(GJJ08270;GJJ10469);江西省自然科学基金(2008GQC0027)

摘　　要：采用等离子束表面冶金技术,在低碳钢基体上制备出原位析出的TiC颗粒增强铁基复合超厚涂层。利用扫描电镜、X射线衍射仪、金相显微镜、显微硬度计及磨损试验分析测试涂层的相、组织、成分及性能。结果表明:表面冶金涂层厚度可达3.0mm,无裂纹、气孔等缺陷。组织为γ-(Fe,Ni)枝晶、M23C6、CrB及原位合成的TiC陶瓷颗粒,TiC大部分呈球状,尺寸为1~3μm,与基体呈良好的冶金结合。由于颗粒强化、细晶强化和弥散强化等多种强化作用,显著提高了Q235钢的显微硬度及耐磨性能。By plasma jet surface metallurgy technology, an ultra-thick gradient TiC/Fe composite coating was synthesized on the low carbon steel. Composition, microstructures and performance of the coating were analyzed by scanning electron microscope, X-ray diffraction, optical microscopy, microhardness tester and wear tester. The results show that excellent bonding between the coating and the carbon steel substrate is ensured by the strong metallurgical interface, and the coating is uniform, continuous and almost defect-free. The microstructure of the coating is mainly composed of γ-(Fe,Ni) dendrite, M23C6 , CrB and TiC ceramic particle which is synthesized in-situ. Most of TiC particles are spherical and TiC particle size is 1-3 μm. Because of the particulate reinforcing, dispersion strengthening, and refinement strengthening, microhardness and wear resistant of the Fe-based coating can be enhanced.

关 键 词：等离子束表面冶金 原位 TIC 超厚涂层 组织 

分 类 号：TG174.4[金属学及工艺—金属表面处理]