稀土对等离子束表面冶金涂层组织的影响及热力学分析  

Effect of Rare Earth on Metallurgical Structure of Plasma Beam Surface Coating and Thermodynamics Analysis

作　　者：陈颢[1] 李惠琪[2] 孙玉宗[3] 李敏[2] 

机构地区：[1]江西理工大学材料与化学工程学院,江西赣州341000 [2]北京科技大学材料科学与工程学院,北京100083 [3]山东科技大学材料学院,山东青岛266510

出　　处：《钢铁研究学报》2007年第6期87-90,共4页Journal of Iron and Steel Research

基　　金：山东省自然科学基金资助项目(Y2002F12)

摘　　要：采用直流放电压缩电弧等离子束表面冶金技术,在Q235钢表面制备了添加混合稀土氧化物的铁基合金涂层,研究了稀土对等离子束表面冶金涂层组织的影响。结果表明:添加适量的混合稀土氧化物可有效改善冶金涂层的组织和性能。另外,采用热力学方法,分析了稀土氧化物对冶金层中夹杂物的变质作用。分析结果表明:在冶金熔池中,稀土氧化物(Ce2O3)可以被碳还原为稀土元素,这些稀土元素与氧、硫反应生成稀土硫氧化物,起到脱氧、脱硫和净化熔池的效果,从而抑制冶金层中凝固裂纹的形成。The Fe-based composite coatings with RE oxides were prepared on Q235 steel substrate by use of the plasma beam, and the effect of RE on microstructure of coating was investigated. The result shows that the microstructure and properties of surface coating with a proper amount of RE oxides are better than these of the coatings without RE oxides. In addition, the modifying effect of RE oxide on inclusions in metallurgical coating was studied by means of thermodynamics. The thermodynamics analysis shows that RE oxide （Ce2O3） can be reduced to RE by carbon, then the RE element can react with oxygen and sulfur to form the RE oxide-sulfide in metallurgical pool. As a result, the coating is purified and the solidification crack of coating can be restrained by deoxidization and desulphurization.

关 键 词：稀土 等离子束表面冶金 组织 热力学 

分 类 号：TG174.4[金属学及工艺—金属表面处理]