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Influence of sintering process on microstructure and properties of CuSn10 oil-impregnated bearing |
QIAN Hang-jun1,LIU Zi-li1,LIU Xi-qin1,TAO Jie1,ZHANG Hao-han1,ZOU De-hua2 |
1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2. Changshu Huade Powder Metallurgy Co., Ltd., Changshu 215534, China |
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Abstract Effects of the sintering atmosphere and sintering time on microstructure and properties of CuSn10 oil-impregnated bearing materials were investigated. The results indicate that powder particle surface is oxidized seriously when the samples are sintered at 720 ℃ for 90 min under argon atmosphere, and there are a great number of large and irregular pores. The oil content of the sample is high whereas the oil-bearing density, radial crushing strength, hardness are all low, and the wear rate is high. With the increasing of the content of H2 in the sintering atmosphere, the oxides in the powder particle surface are reduced. The pore amount and size decrease with the pore shape closing to spherical. The oil content of the samples is decreased, and the oil-bearing density, radial crushing strength, hardness of the sample are increased, the wear rate is reduced firstly and then increased. When the samples are sintered at 720 ℃ for 30 min under 50%H2+50%Ar atmosphere (volume percent), irregular-shaped pores turn into spherical, but the pores are unevenly distributed and the size are large. When the sintering time is increased to 60 min and 90 min, the pore size is reduced. However, the pore amount and shape have no significant change when the sintering time is further increased to 120 min. With the increasing of sintering time, the oil-bearing density, mechanical properties and wear rate of samples are increased.
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Received: 14 October 2014
Published: 17 June 2015
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