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论文类型：期刊论文

发表时间：2007-10-01

发表刊物：JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

收录刊物：SCIE、EI、Scopus

卷号：14

期号：5

页面范围：464-468

ISSN号：1005-8850

关键字：composites; pulse plating; electro-discharge machining (EDM); electrode

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.