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摘要：
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通过采用陶瓷材料作为凹模,研制能对压制的粉末施加冲击电流的模具,研究了冲击电流在铁粉压制过程中的致密作用。试验采用0.12F电容组,分别在不同充电电压和不同初始压制条件下,瞬时将电能以冲击电流形式作用于压制铁粉中,压成尺寸约为Ф10mm×10mm的圆柱形压坯。试验表明,施加冲击电流后,铁粉压坯密度可以增加5%~7%。充电电压越高或铁粉压坯初始密度越低,冲击电流对压坯密度增长的贡献越大。
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The ceramic mold is developed to apply surge current to compacted iron powder.The densification effect of surge current on compacted iron powder is studied.Tests are conducted by using the capacitor bank with capacitance 0.12 Farad under conditions of different applied voltages and initial pressures.Surge current is impacted on compacted iron powder part to produceФ10×10mm cylinder.It is found that the density of powder parts increases 5%～7% as surge current is applied to compacted iron powder.The higher the voltage is,the lower of part's initial density is,and the greater contribution of surge current to the density increase of iron powder part is.
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基金项目：
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上海市教委科技发展基金资助项目(03AK17)
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作者简介：
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参考文献：
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[1]闫来成,曹勇家.汽车用高性能粉末冶金零部件产业化市场与技术分析[J].新材料产业,2004,(1):36 41.
[2]徐润泽.粉末冶金结构材料学[M].长沙:中南工业大学出版社,1998.
[3]Capus J M.Automotive PM developments from both Japaneseand European perspectives[J].Metal Powder Report,2001,56(4):20 21.
[4]肖志瑜,陈平,李元元.粉末冶金高致密化新途径[J].材料导报,2003(11):5 8.
[5]李元元,项品峰,夏伟,等.温压工艺———制备高密度粉末冶金零件的新技术[J].材料导报,2000(2):25 27.
[6]高一平.粉末冶金新技术:电火花烧结[M].北京:冶金工业出版社,1992.
[7]Pajagopalan P K,Desai S V,Kalghatgi R S,et al.Studies onthe electric discharge compaction of metal powders[J].Mate-rials Science and Engineering,2000,280(2):289 293.
[8]翟文杰,陈仁际,齐毓霖.用外加电压控制摩擦力的机理与技术[J].摩擦学学报,1996,(1):1 5.
[9]唐国翌,郑明新,朱永华,等.奥氏体不锈钢丝的电塑性拔制[J].金属制品,1997(1):6 9.
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