深松铲NiWC喷焊层耐磨性研究

Study on wear-ability of deep-shovel with NiWC coating

为解决深松铲寿命低、失效频繁的问题,采用火焰喷焊技术在Q235普通碳素钢基体上制备了Ni60+50WC涂层,通过正交试验和多因素方差分析,研究了预热温度、乙炔流量、喷涂距离对涂层耐磨性的影响,优化了喷焊工艺参数:预热温度500℃,乙炔流量1 000L/h,喷涂距离25mm。利用扫描电镜、光学显微镜、往复式摩擦磨损试验机和显微硬度计对喷焊层的显微组织、显微硬度和耐磨性进行了测试,并与原深松铲(65Mn)进行了耐磨性对比试验。结果表明:喷焊后深松铲的显微硬度约为原深松铲的2倍,摩擦系数约为原深松铲的1/2,使用寿命约为原深松铲的1倍,喷焊后的深松铲具有较好的耐磨性。

In order to solve the problem of short‐lifetime and failure frequently of deep‐shovel , with flame spray welding technology in Ni60＋50WC coating was prepared on Q235 plain car‐bon steel substrate ,by means of orthogonal test and multiple factors variance analysis ,study the influence to wear‐ability of preheat temperature ,acetylene flow ,spraying distance .Spray welding craft parameters were optimized as follows .Preheat temperature ：500 ℃ ,acetylene flow 1 000 L/h ,spraying distance 25 mm .The microstructure ,micro hardness and wear re‐sistance were investigated by scanning electron microscope ,scanning optical microscope ,mi‐crohardness tester and reciprocating friction testing machine ,compared with the original deep‐shovel（65Mn）wear‐resisting contrast test .The results show that spray hardness after welding is about 2 times of the original deep‐shovel ,its friction coefficient is about 1/2 of the original deep‐shovel and service life is about 1 times of the original deep‐shovel .The deep‐shovel after spray welding has good wear resistance .