Effect of direct current and pulse plating on the EDM performance of copper-zirconium diboride composites  

作　　者：Dongming Guo Min Zhang Zhuji Jin Renke Kang 

机构地区：[1]Key Laboratory of the Ministry of Education of China for Precision ＆ Non-traditional Machining, Dalian University of Technology, Dalian 116024, China

出　　处：《Journal of University of Science and Technology Beijing》2007年第5期464-468,共5页北京科技大学学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China (No. 59935110);the Science Founda-tion of Liaoning Province, China (No. 20062183).

摘　　要：Direct current and pulse plating of copper-zirconium diboride （ZrB2） composites were studied and the effects of current density （DC） and pulse duty cycle （PC） on the EDM performance of the composites were investigated. With increasing current density, the effect of grain refinement on the electro-discharge machining （EDM） performance of the composites compensates that of the decrease of ZrB2 content in the composites, which improves the spark-resistance of the material. Under the same average current density and other experiment conditions, a lower duty cycle yields better EDM performance probably because more ZrB2 particles are incorporated in the composites in this condition. However, at a still lower duty cycle （10%）, the particle agglomeration and the microcracks of the copper matrix occur, which considerably deteriorate the spark-resistance of the composites.Direct current and pulse plating of copper-zirconium diboride （ZrB2） composites were studied and the effects of current density （DC） and pulse duty cycle （PC） on the EDM performance of the composites were investigated. With increasing current density, the effect of grain refinement on the electro-discharge machining （EDM） performance of the composites compensates that of the decrease of ZrB2 content in the composites, which improves the spark-resistance of the material. Under the same average current density and other experiment conditions, a lower duty cycle yields better EDM performance probably because more ZrB2 particles are incorporated in the composites in this condition. However, at a still lower duty cycle （10%）, the particle agglomeration and the microcracks of the copper matrix occur, which considerably deteriorate the spark-resistance of the composites.

关 键 词：COMPOSITES pulse plating electro-discharge machining （EDM） ELECTRODE 

分 类 号：TG17[金属学及工艺—金属表面处理]