摘要
对加热Cu粉末进行磁脉冲致密试验研究,探索提高压坯致密度且不使粉末颗粒产生明显长大的致密方法.通过压坯平均致密度和微观金相形貌分析,揭示了加热温度、放电参数和粉末体高径比等工艺参数对Cu粉末热复合磁脉冲致密压坯致密度的影响规律.研究表明:压坯致密度不随温度升高而线性增加,200℃时的致密度最高;在给定放电能量和200℃下,压坯的致密度随电压和电容量增加而提高,随粉末质量增加而降低;3次放电显著改善压坯致密效果,致密度达98.75%,再增加次数的影响甚微.
In order to seek an advanced powder compaction method, by which the higher relative density can be achieved without noticeable grain growth, a series of experiments were performed to compact heated Cu powder through magnetic pulse compaction. Effects of the process parameters, such as heating-up tempera-ture, discharge parameters and aspect ratio of powder body, on the relative density of Cu powder compact prepared by magnetic pulsed compaction and heating were investigated through the average relative density and metallographic analysis. The results show that the relative density of compact does not linearly increase with the temperature and the value reaches the maximum at 200℃. Under the conditions of the constant discharge energy and the temperature of 200℃, the increases of the discharge voltage and capacitance enhance the relative density which decreases with the augment of powder mass. The relative density can be improved promi-nently by iterative compacting and three times of discharge are optimal corresponding to the value of 98.75%.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2008年第2期153-157,共5页
Materials Science and Technology
关键词
磁脉冲致密
热复合
致密度
工艺参数
Cu粉末
magnetic pulsed compaction
heating
relative density
process parameters
Cu powder
