Effect of Sintering Process on Microstructure and Properties of Copper-Iron-based Oil-impregnated Bearing
LI Dongyu1, LI Xiaoqiang1, LI Jingmao1, QU Shengguan1, XU Geqing2
1 National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China 2 Guangzhou Golden South Magnetic Material Co, Ltd, Guangzhou 511300, China
Abstract: The copper-iron-based oil-impregnated bearings were prepared by powder metallurgy, and DSC, SEM, compression tests were used to study the effects of sintering atmosphere(nitrogen, decomposed ammonia and hydrogen)and sintering temperature(825—885 ℃)on the microstructure, oil content and mechanical properties of the bearing materials. The results indicate that when the samples are sintered at 865 ℃ under nitrogen atmosphere,the iron-nitrogen compound on the surface of iron powder and the oxide film on the surface of brass powder hinder the metallurgical bonding between iron powder and brass powder. When the samples are sintered under hydrogen atmosphere, severe dezincification of Cu3Zn phase occurs. There are many irregularly shaped cracks and pores in the microstructure corresponding to these two atmospheres, which significantly reduces the oil content, hardness and crushing strength. When sintered under decompose ammonia atmosphere, the metallurgical bonding between the powder particles of the samples is sufficient, and the degree of dezincification of the Cu3Zn phase is low. The pores tend to be spherical, and the oil content, hardness and crushing strength are significantly improved. When the samples are sintered at 825 ℃ and 845 ℃ under decompose ammonia atmosphere, no obvious metallurgical bonding occurs between the powder particles and the hardness and crushing strength are low. When the sintering temperature is increased to 865 ℃, the degree of metallurgical integration has increased, the number of pores is greatly reduced, and the hardeness and crushing strength are significantly improved. The sintering temperature is increased to 885 ℃, the sample is oversintering, the shrinkage is large, and the oil content decreases sharply. When sintered at 865 ℃ under decompose ammonia atmosphere, the sintered samples have good comprehensive properties. The oil content, hardness and crushing strength are 18.8% (volume fraction), 43.7HB, and 271.1 MPa, respectively.
李东宇, 李小强, 李京懋, 屈盛官, 徐各清. 烧结工艺对铜铁基含油轴承组织与性能的影响[J]. 材料导报, 2021, 35(8): 8157-8163.
LI Dongyu, LI Xiaoqiang, LI Jingmao, QU Shengguan, XU Geqing. Effect of Sintering Process on Microstructure and Properties of Copper-Iron-based Oil-impregnated Bearing. Materials Reports, 2021, 35(8): 8157-8163.
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2021, Vol. 35 
