材料期刊网

目的：采用等离子熔覆-注射工艺在 Q235基体上制备 B4 C 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 B4 C 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。 B4 C 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 B4 C 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 B4 C 工艺能够增强 B4 C 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 B4 C 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 cladding-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 B4 C process was beneficial to enhance the bonding force between the B4 C and the cladding layer, and improve the hardness and wear resistance of the plasma cladding-injecting coating.