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- 2016
掺杂纳米SnO2-Al2O3/Cu新型电触头复合材料的制备及耐磨性能
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Abstract:
为满足低压电器对于高品质电触头材料的迫切需求，同时保护稀缺资源、降低电触头成本，采用粉末冶金工艺制备了掺杂纳米SnO2-Al2O3/Cu新型电触头复合材料，并对其电导率、硬度及耐磨性能进行了研究。结果表明：复烧与冷变形工艺均可显著提高复合材料的烧结质量、密度、电导率与硬度。随着纳米Al2O3及掺杂纳米SnO2颗粒的总含量增加，掺杂纳米SnO2-Al2O3/Cu电触头复合材料的硬度与耐磨性能表现出了相同的变化规律，即先升高后降低。当纳米Al2O3及掺杂纳米SnO2颗粒的总含量为0.80wt%时，复合材料的硬度与耐磨性能均达到最优；而当纳米Al2O3及掺杂纳米SnO2颗粒的总含量保持0.80wt%不变时，随纳米Al2O3颗粒的含量增加，掺杂纳米SnO2-Al2O3/Cu电触头复合材料的硬度与耐磨性能改善；当掺杂纳米SnO2颗粒的含量为0时，复合材料的耐磨性能达到了最优。因此较之掺杂纳米SnO2颗粒，纳米Al2O3颗粒对掺杂纳米SnO2-Al2O3/Cu电触头复合材料的耐磨性能有更显著的提高作用。 In order to meet the urgent needs of low-voltage electrical equipment for high quality electrical contact materials, and to protect the scarce resources and reduce the cost of electrical contact at the same time, doped nano-SnO2-Al2O3/Cu novel electrical contact composites were fabricated by using powder metallurgy technique. The electrical conductivity, hardness and wear resistances of them were also investigated. The results show that both of re-sintering and cold deformation processes can improve the sintering quality, density, electrical conductivity as well as hardness of the composites significantly. With the increasing for total content of nano-Al2O3 and doped nano-SnO2 particles, hardness and wear resistances of the doped nano-SnO2-Al2O3/Cu electrical contact composites show the same change rule, which increases firstly and then decreases. When the total content of nano-Al2O3 and doped nano-SnO2 particles is 0.80wt%, both of the hardness and wear resistances of the composites reach the optimum. While when the total content of nano-Al2O3 and doped nano-SnO2 particles remains unchanged at 0.80wt%, with the content of nano-Al2O3 particles increasing, the hardness and wear resistances of the doped nano-SnO2-Al2O3/Cu electrical contact composites enhance. When the content of doped nano-SnO2 particles is 0, the wear resistance of the composite reaches the optimum. Therefore, compared with doped nano-SnO2 particles, the nano-Al2O3 particles have a more significant improving effect on the wear resistance of the doped nano-SnO2-Al2O3/Cu electrical contact composites. 中国博士后科学基金（2014M551008）；河北省自然科学基金（2014Z02184）
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