摘要
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.
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 HBI8 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.
出处
《中国有色金属学会会刊：英文版》
CSCD
2007年第A02期634-638,共5页
Transactions of Nonferrous Metals Society of China
