WC对感应钎涂金刚石涂层组织及性能的影响

Effect of WC on microstructure and properties of induction brazing diamond coating

在镍基钎料中加入WC微粉,采用钎涂的方法在Q235钢上制备金刚石涂层,研究WC微粉对金刚石涂层组织及耐磨性的影响,并通过扫描电镜、能谱分析、显微硬度和磨损失重测试表征金刚石钎焊涂层的组织和耐磨性能。结果表明:在钎涂过程中,金刚石、WC微粉与镍基钎料合金发生冶金结合,WC颗粒在镍基基体中具有弥散强化与细晶强化作用,添加质量分数为10%WC的钎料合金的洛氏硬度与未添加WC时的比较提高了7.5%;且在相同的磨损实验条件下,未添加WC微粉的钎涂金刚石涂层质量损失为0.196 g,而添加WC微粉后的涂层质量损失为0.148 g,后者的耐磨性能提高了24.5%。

The diamond coating was prepared on Q235 steel by adding WC micro-powder to a nickel-based filler metal during induction brazing.The effects of WC powder on the microstructure and wear resistance of the diamond coating were studied.The microstructure and wear resistance of the diamond coating were characterized by scanning electron microscopy,energy spectrum,microhardness and wear loss tests.The results show that during the brazing process,diamond and WC micro-powder form metallurgical bonds with the nickel-based brazing alloy.The WC particles contribute to dispersion strengthening and fine-grain strengthening effects in the nickel-based matrix.The Rockwell hardness of the brazing alloy with a mass fraction of 10%WC increases by 7.5%compared to that without WC.Under identical wear experimental conditions,the mass loss of the diamond coating without added WC micro-powder was 0.196 g,while the mass loss of the coating with WC micro-powder added was 0.148 g.The wear resistance of the latter increased by 24.5%.