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Volume 38 Issue 6
Dec.  2020
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NI Feng, SUN Gao-ang, LI Wu-hui, FU Li-hua, LI Ling, MENG Yun-na, FAN Ya-li. Effects of sintering temperature on microstructures and properties of Cu-C-SnO2 porous materials[J]. Powder Metallurgy Technology, 2020, 38(6): 436-442. DOI: 10.19591/j.cnki.cn11-1974/tf.2019070008
Citation: NI Feng, SUN Gao-ang, LI Wu-hui, FU Li-hua, LI Ling, MENG Yun-na, FAN Ya-li. Effects of sintering temperature on microstructures and properties of Cu-C-SnO2 porous materials[J]. Powder Metallurgy Technology, 2020, 38(6): 436-442. DOI: 10.19591/j.cnki.cn11-1974/tf.2019070008
shu

Effects of sintering temperature on microstructures and properties of Cu-C-SnO2 porous materials

  • 1.

    School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China

  • 2.

    National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, China

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    • Abstract
  • The Cu-C-SnO2 composite porous materials were prepared by pressureless sintering with the addition of SiO2-B2O3-Al2O3 scaling powders. The effects of sintering temperature on the microstructures and properties of the Cu-C-SnO2 porous composites were investigated. The results show that, the porous composites are composed of metal Cu, graphite, and oxide ceramic phases. As the sintering temperature increases, the content of SnO2 decreases and the content of oxide ceramic phases (such as mullite) increases. The content of Cu2O increases when the sintering temperature rises from 750 ℃ to 800 ℃, which decreases as the sintering temperature above 800 ℃. At the sintering temperature of 950 ℃, the Cu grains coarsen observably because of the recrystallization. The electric resistivity, oil penetration rate, and air permeability coefficient of the composites vary similarly with the change of the sintering temperature, and there are the minimum values in the sintering temperature range of 850 ℃ to 900 ℃. The sintering shrinkage and density of the sintered compact vary similarly with the change of the sintering temperature, and there are the critical values at the sintering temperature near 800 ℃. The change rates of the sintering shrinkage and density of the sintered compact are significantly different on the both sides of the critical values. The hardness of the sintered compact increases with the rising of sintering temperature and shows a jump in the range of 800 ℃ to 850 ℃.
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