中国激光, 2013, 40 (10): 1003005, 网络出版: 2013-09-25   

激光熔覆原位自生CrxSy/Ni基复合涂层的微观组织和摩擦磨损性能

Microstructure and frictional wear Properties of Laser Clad in Situ CrxSy/Ni Composite Coating
作者单位
1 天津工业大学机械工程学院, 天津 300387
2 天津市现代机电装备技术重点实验室, 天津 300387
摘要
以Ni60+33%Ni/MoS2(质量分数)混合粉末为熔覆材料,在H13钢表面进行了激光熔覆试验,利用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析仪(EDS)和X射线衍射仪(XRD)等对激光熔覆层的微观组织进行了分析,测试了激光熔覆层的摩擦磨损性能。结果表明,激光熔覆层的组织是在γ-Ni树枝晶和γ-Ni+MoNi4共晶的基体上分布着CrxSy颗粒。激光熔覆过程中原位自生的CrxSy颗粒呈近球状,尺寸在5~20 μm之间,尺寸较大的颗粒多分布于熔覆层的上部,尺寸较小的颗粒多分布于熔覆层的中下部。由于CrxSy的减摩作用,熔覆层的摩擦系数明显低于Ni60熔覆层的摩擦系数,但耐磨性能有所降低。
Abstract
CrxSy/Ni coating is prepared on H13 steel by laser cladding using powder mixture of NiCrBSi+33%Ni/MoS2 (mass fraction). The microstructure of the coating is examined using optical microscope (OM), scanning electronic microscope (SEM), energy dispersive spectrometer (EDS), and X-ray diffractor (XRD). The frictional wear properties of the coating are tested. The results show that the coating consists of CrxSy particles distribute in γ-Ni dentrites and γ-Ni+MoNi4 eutectics matrix. The in situ formed CrxSy particles appear quasi-spherical shape, with size of 5~20 μm. The relatively larger particles are mainly distributed in the upper layer of the coating and the smaller particles are mainly distributed in the middle and bottom layer of the coating. Due to the lubrication of CrxSy, the friction coefficient of the situ formed CrxSy/Ni self-lubricating coating is significantly lower than that of laser clad NiCrBSi coating. However, its wear resistance slightly decreases.

孙荣禄, 牛伟, 雷贻文, 唐英. 激光熔覆原位自生CrxSy/Ni基复合涂层的微观组织和摩擦磨损性能[J]. 中国激光, 2013, 40(10): 1003005. Sun Ronglu, Niu Wei, Lei Yiwen, Tang Ying. Microstructure and frictional wear Properties of Laser Clad in Situ CrxSy/Ni Composite Coating[J]. Chinese Journal of Lasers, 2013, 40(10): 1003005.

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