摘要
以Ni60＋330ANi／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γNi＋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5～20μm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。
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.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2013年第10期103-108,共6页
Chinese Journal of Lasers
基金
天津市应用基础及前沿技术研究计划(11JCZDJC21400)
教育部博士点基金(20091201110002)
