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| Application of nanotechnology in a silver／graphite contact material and optimization of its physical and mechanical properties | |
| 作者姓名： | YUHaifeng LEIJingxuan MAXueming ZHULihui LUYao XIANGJing WENGWei |
| 作者单位： | [1]SchoolofMaterialsScienceandTechnology,ShanghaiUniversity.Shanghai200072.China [2]PhysicsDepartment.EastChinaNormalUniversity.Shanghai200062,China [3]ShanghaiElectricalApparatusResearchInstitute.Shanghai200063.China,China |
| 基金项目： | This work was financially supported by the National Natural Science Foundation of China (No. 50071029). |
| 摘 要： | By applying nanotechnology, a new type of silver/graphite (AgC) electrical contact was fabricated and charac-terized. The AgC coating powders were obtained through high-energy ball milling and reducer liquid spraying-coating method. The as-prepared powders were examined by transmission electron microscope (TEM), scanning electron micro-scope (SEM), and X-my diffraction (XRD). The results show that the thickness of graphite flakes milled for 10 h is about 50-60 nm and the AgC coating powders exhibit flocculent structure with quite free and homogeneous intemal micropores.XRD implies that the average crystalline size of silver in coating powders is about 50 rim. The mechanical and physical properties of this newly developed AgC contact made from the above-mentioned nanocrystalline powders by traditional powder metallurgy technique were measured. Compared with its counterparts made from other techniques, the properties of this new AgC contact have been optimized. High surface energy and high-energy interfaces of the nanocrystalline AgC coating powders provide powerful driving force for sintering densification. Moreover, the flocculent structure of the pow-ders is also an important factor to acquire fine density ratio. |
| 关 键 词： | 纳米技术 银-石墨电气插头 物理性质 化学性质 高能球磨研磨 还原性液体喷雾涂层 最优化 |
Application of nanotechnology in a silver/graphite contact material and optimization of its physical and mechanical properties |
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| YUHaifeng LEIJingxuan MAXueming ZHULihui LUYao XIANGJing WENGWei.Application of nanotechnology in a silver/graphite contact material and optimization of its physical and mechanical properties[J].Rare Metals,2004,23(1):79-83. | |
| Authors: | YU Haifeng LEI Jingxuan MA Xueming ZHU Lihui LU Yao XIANG Jing WENG Wei |
| Affiliation: | 1. School of Materials Science and Technology, Shanghai University, Shanghai 200072, China 2. Physics Department, East China Normal University, Shanghai 200062, China 3. Shanghai Electrical Apparatus Research Institute, Shanghai 200063, China |
| Abstract: | By applying nanotechnology, a new type of silver/graphite (AgC) electrical contact was fabricated and characterized. The AgC coating powders were obtained through high-energy ball milling and reducer liquid spraying-coating method. The as-prepared powders were examined by transmission electron microscope (TEM), scanning electron microscope (SEM), and X-ray diffraction (XRD). The results show that the thickness of graphite flakes milled for 10 h is about 50-60 nm and the AgC coating powders exhibit flocculent structure with quite fine and homogeneous internal micropores. XRD implies that the average crystalline size of silver in coating powders is about 50 nm. The mechanical and physical properties of this newly developed AgC contact made from the above-mentioned nanocrystalline powders by traditional powder metallurgy technique were measured. Compared with its counterparts made from other techniques, the properties of this new AgC contact have been optimized. High surface energy and high-energy interfaces of the nanocrystalline AgC coating powders provide powerful driving force for sintering densification. Moreover, the flocculent structure of the powders is also an important factor to acquire fine density ratio. |
| Keywords: | contact material AgC-N (newly developed) nanotechnology high-energy ball milling reducer liquid spraying-coating method optimization |
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