A comparative study of laser cladding high temperature wear-resistant composite coating with the addition of self-lubricating WS2 and WS2/(Ni–P) encapsulation |
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| Authors: | Xiu-Bo Liu Chen Zheng Yuan-Fu Liu Ji-Wei Fan Mao-Sheng Yang Xiang-Ming He Ming-Di Wang Hong-Bing Yang Long-Hao Qi |
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| Affiliation: | 1. School of Mechanical & Electric Engineering, 178 Ganjiang East Road, Soochow University, Suzhou 215006, PR China;2. Institute of Materials Science & Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, PR China;3. School of Materials & Chemical Engineering, 41 Zhongyuan Road Middle, Zhongyuan University of Technology, Zhengzhou 450007, PR China;4. State Key Laboratory of New Ceramics & Fine Processing, Tsinghua University, Beijing 100084, PR China |
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| Abstract: | In order to inhibit its decomposition and improve its compatibility with the metal matrix during laser cladding, WS2 powder was encapsulated with a layer of micro Ni–P by electroless plating. The microstructure and tribological properties of the NiCr–Cr3C2/30%WS2 and NiCr–Cr3C2/30%WS2(Ni–P) high temperature self-lubricating wear-resistant composite coatings at RT (room temperature), 300 °C and 600 °C were investigated, respectively. It was found that the NiCr–Cr3C2/30%WS2(Ni–P) coating had a microstructure consisting of primary Cr7C3 dendrite, γ-(Fe,Ni)/Cr7C3 eutectic and solid lubricant particles WS2 and CrS, Ni–P electroless plating had decreased the decomposition of WS2 to some extent, the WS2 solid lubricant particles dispersed in the ductile γ-(Fe,Ni)/Cr7C3 matrix. Friction and wear experiments indicated that the tribological properties of the NiCr–Cr3C2/30%WS2(Ni–P) coating was better than that of NiCr–Cr3C2/30%WS2 coating, the NiCr–Cr3C2/30%WS2(Ni–P) coating presents lower friction coefficient at RT and 300 °C and lower wear rate from RT to the elevated temperature of 600 °C. |
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