THE STUDY OF HIGH-TEMPERATURE BEHAVIORS OF BRUSH-PLATINGNI/NANO-SiO2COMPOSITE COATING

Jiang Xu (), Jie Tao, Chenzhi Zhuo and Shuyun Jiang
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Jiang Xu: Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, P. R. China
Jie Tao: Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, P. R. China
Chenzhi Zhuo: Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, P. R. China
Shuyun Jiang: Department of Mechanical Engineering, Southeast University, 2 Si Pai Lou, Nanjing 210096, P. R. China

Surface Review and Letters (SRL), 2008, vol. 15, issue 05, 641-651

Abstract: In order to improve the high-temperature behaviors of hot work die steel in engineering application, the high-temperature wear and thermal fatigue behavior of brush platingNi/nano-SiO2composite coating have been investigated. The microstructure ofNi/nano-SiO2composite coating has been analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). TEM observation ofNi/nano-SiO2composite coating has shown that the addedSiO2particle with an average size of about 20 nm is uniformly distributed in Nickel matrix. The high-temperature wear behavior ofNi/nano-SiO2composite coating has been investigated using a ball-on–block test rig. The results from the high-temperature wear behaviors studies indicate that the steady-state friction coefficient and the specific wear rate ofNi/nano-SiO2composite coating are lower than that ofCr12MoNisteel. The thermal fatigue tests were fulfilled by heating and quenching in water at a cycle period of 2 min. The results of thermal fatigue testing show that brush platingNi/nano-SiO2composite coating can improve thermal fatigue resistance as compared to theCr12MoNihot rolling tool steel.

Keywords: Ni/nano-SiO2composite coating; high-temperature wear; thermal fatigue; thermal stability (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X0801169X

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