Effect of Milling Time on Electrical Breakdown Behavior of Al2O3/Cu Composite
Effect of Milling Time on Electrical Breakdown Behavior of Al2O3/Cu Composite
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DOI：
10.1007/s11665-009-9556-x
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发表时间：
2010-08
影响因子：
2.3
通讯作者：
Xianhui Wang;S. Liang;P. Yang;Z. Fan
中科院分区：
文献类型：
--
作者：
Xianhui Wang;S. Liang;P. Yang;Z. Fan
为了阐明金属基复合材料显微组织与电弧烧蚀行为之间的关系，采用高能球磨和粉末冶金方法制备了不同Al2O3颗粒分布的Al2O3/Cu复合材料。研究了铣削时间对Al2O3/Cu复合材料显微组织、性能和电弧侵蚀行为的影响。结果表明，随着球磨时间的增加，Al2O3颗粒的分布明显改善，但球磨时间过长，Al2O3颗粒会发生团聚。在实验范围内，最佳研磨时间为 24 小时。 Al2O3颗粒在铜基体中均匀分布可以提高硬度、导电率、平均击穿强度、斩波水平和电弧寿命。随着Al2O3颗粒分布的改善，侵蚀面积变大，侵蚀坑变浅且分散更均匀。
In order to clarify the relationship between the microstructure and the arc erosion behavior of metal-matrix composite, Al2O3/Cu composites with different distributions of Al2O3particles were prepared by high energy ball milling and powder metallurgy. The effect of milling time on microstructure, properties, and arc erosion behavior of Al2O3/Cu composite was investigated. The results show that the distribution of Al2O3particles improves significantly with increase of milling time, but Al2O3particles will be aggregated if milling time is too long. The optimal milling time is 24 h in the range of experiments. A uniform distribution of Al2O3particles in copper matrix can improve the hardness, electrical conductivity, average breakdown strength, chopping level, and arc life. With improvement in the distribution of Al2O3particles, the erosion area becomes larger, and the erosion pits become shallower and are dispersed more uniformly.