Preparation of Ni-Cr/BN self-lubricating composites by active sintering process
A Ni-Cr/BN composite was produced by a active sintering process.The powder of nickel carbonyl，Cr2O3 and C were used as the original materials，and a hexagonal BN(h-BN) powder was added as a solid lubricant.The influence of sintering temperature,heating rate and holding time on the properties of Ni-Cr/BN were studied.The composition and microstructure of Ni-Cr/BN were analysed by X-ray diffraction(XRD) and the optical microscopy(OM).The frictional behavior and hardness were measured with ring-block friction testing machine and Brinell hardness tester respectively.The results show that Ni-Cr is the matrix and a low-melting eutectic compound is the bonding phase in the composite.The porosity reaches 48％ and the value of hardness reaches HB18 when the composite is fabricated at 1 100 ℃ for 1 h.Its wear rate is 7.44×10.5 g/min,and the average friction coefficient is 0.266.These properties make such composite suitable for use as self-lubricating material.
activated sintering Ni-Cr/BN composite solid lubrication material
YU Kun YANG Zhen WANG Ri-chu TAN Ying-guo
School of Materials Science and Engineering,Central South University,Changsha 410086,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）