The interfacial and tribological properties of Ni–Cr alloy/ceramic tribo-couples under dry sliding contact |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;1. College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, 710021, China;2. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, 710049, China;3. State Key Laboratory of Electrical Insulation and Power Equipment, Xi''an Jiaotong University, Xi''an, Shaanxi, China |
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| Abstract: | In this paper, the tribological behaviors of Ni–Cr alloy sliding against Si3N4 and WC–Co at 20 °C and 600 °C were investigated on a tribometer with a ball-on-disk configuration. The experimental results indicated that Ni–Cr alloy sliding against WC–Co exhibited higher wear resistance than that sliding against Si3N4. From the viewpoints of the interfacial interactions between metal and ceramic (chemical reaction, wetting, adhesion, transference), the wear mechanisms were elucidated. The tribological behaviors of Ni–Cr alloy/ceramic tribo-couples were well correlated with the interfacial characteristics, namely the reactive interface and the non-reactive interface. Ni–Cr alloy/Si3N4 tribo-couple showed severe adhesive wear as a result of the interfacial reaction between Ni and Si3N4, while the non-reactivity of Ni/WC interface is the most important factor corresponding to the moderate adhesive wear in Ni–Cr alloy sliding against WC–Co. Finally, the relations among the interfacial characteristics, wear behavior, and temperature were discussed. The results may provide some experimental evidences on the design and optimization of metal/ceramic tribo-couples. |
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