等离子熔覆-注射B_4C铁基熔覆层组织耐磨性研究  

Study on Wear Resistance of Fe-based Clad Coating Prepared by Plasma Cladding-B_4C Injection

作　　者：王新帅[1] 静丰羽 张喜冬[1] 赵靖宇[1] 孙玉福[1] 

机构地区：[1]郑州大学材料科学与工程学院,郑州450002

出　　处：《表面技术》2014年第5期42-46,共5页Surface Technology

摘　　要：目的采用等离子熔覆-注射工艺在Q235基体上制备B4C铁基熔覆层并研究其耐磨性。方法通过OM,SEM,EDS等分析熔覆层及界面的组织特征,并进行耐磨性测试。结果当B4C质量占主体熔覆材料质量的18%时,注射熔覆层表面比较平整,无裂纹。注射熔覆层组织致密,界面呈现平直的亮白色过渡层,稀释率小,与基体形成了良好的冶金结合。B4C陶瓷颗粒表面溶解会形成Fe,Cr等元素的硼化物。等离子熔覆-注射B4C熔覆层的耐磨性是42CrMo的22倍,是16Mn钢的41倍。结论等离子熔覆-注射B4C工艺能够增强B4C与熔覆层之间的结合力,提高熔覆层的硬度和耐磨性。Objective Fe-based B4 C composite clad coating was prepared on the surface of Q235 steel by plasma cladding-in- jection process, and its wear resistance was studied. Methods The microstructure and dry-sliding wear behavior of the clad layer were investigated by means of optical microscopy （OM）, scanning electron microscopy （SEM）, energy dispersive spectrometry （EDS） and ball-on-disc wear experiments. Results The experimental results showed that when the B4C accounted for 18% of the quality of the main body cladding material, the surface of the clad coating was smooth, without cracks. In addition, the plasma claddlng-injecting coating had a compact texture, a low dilution rate and a good metallurgical bonding with carbon steel substrate, and there was a bright white transition layer in the interface. During the dissolving of the surface of the B4 C ceramic particles, bo- rides of Fe and Cr were formed. The wear resistance test showed that the plasma cladding-injecting coating had high wear resist- ance, which was twenty-two times that of the 42CrMo steel, and forty-one times that of the 16Mn steel. Conclusion The plasma cladding-injection B4C process was beneficial to enhance the bonding force between the B4C and the cladding layer, and improve the hardness and wear resistance of the plasma cladding-injecting coating.

关 键 词：等离子熔覆 注射 B4C 铁基熔覆层 耐磨性 

分 类 号：TG174.442[金属学及工艺—金属表面处理]