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Journal of Central South University

, Volume 18, Issue 5, pp 1334–1339 | Cite as

Effects of h-BN content on properties of Ni-Cr/h-BN composite

  • Xiao-feng Wei (韦小凤)
  • Ri-chu Wang (王日初)Email author
  • Yan Feng (冯艳)
  • Chao-qun Peng (彭超群)
  • Xue-wei Zhu (朱学卫)
Article

Abstract

Ni-Cr/h-BN self-lubricating composities were prepared by powder metallurgy (P/M) method. The effects of hexagonal boron nitride (h-BN) content on the mechanical and tribological properties of the Ni-Cr/h-BN composites were investigated. The corresponding frictional models were established to analyze the formation of the lubricant h-BN films on the surfaces of the Ni-Cr/h-BN composites. The results show that, when the content of h-BN increases from 5% to 15% (mass fraction), the bending strength of the Ni-Cr/h-BN composite decreases from 96.670 MPa to 17.319 MPa, and the hardness (HB) decreases from 33 to 14. The friction coefficient of the Ni-Cr/h-BN composite decreases firstly from 0.385 to 0.216, and then increases to 0.284, while the wear rate decreases firstly from 4.14×10−9 kg/(N·m) to 1.35×10−9 kg/(N·m), then increases to 2.36×10−9 kg/(N·m). The best comprehensive mechanical and tribological properties can be obtained between 10% and 12% h-BN addition.

Key words

Ni-Cr/h-BN composite hexagonal boron nitride solid lubricating film friction coefficient wear rate 

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Copyright information

© Central South University Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Xiao-feng Wei (韦小凤)
    • 1
  • Ri-chu Wang (王日初)
    • 1
    Email author
  • Yan Feng (冯艳)
    • 1
  • Chao-qun Peng (彭超群)
    • 1
  • Xue-wei Zhu (朱学卫)
    • 1
  1. 1.School of Materials Science and EngineeringCentral South UniversityChangshaChina

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