摘要
采用分别在1050、1150、1250、1350和1450℃下烧结WCr骨架后熔渗铜的方法制备了Cu-WCr复合材料,比较了不同温度烧结制备的WCr骨架及其复合材料的显微组织形貌,并研究了不同烧结温度对CuWCr复合材料硬度、电导率及其真空击穿性能的影响。结果表明,烧结温度越高,WCr骨架的合金化程度越高,1450℃下烧结2.5h后,得到完全合金化的WCr固溶体骨架;随着烧结温度的提高,制备的CuWCr复合材料材料的真空耐电压强度提高,截流值变化不大,真空电弧相对稳定,电弧寿命在0.020ms左右。
The W-Cr skeletons were prepared by sintering at 1050,1150,1250,1350 and 1450℃ respectively and then infiltrated pure copper liquid in vacuum to form CuWCr composites. The morphology of the skeletons and microstructure the composites were observed by SEM and the influence of the sintering temperature on the properties including hardness, electrical conductivity and breakdown properties in vacuum of the composites were discussed as well. The results showed that the W-Cr alloying skeletons became more uniform with the rising of sintering temperature. The skeletons are entirely alloyed after sintering at 1450℃ for 2. 5h. The breakdown strength of CuWCr composites increases gradually with the increase of the sintering temperature, while the chopping current values have no obvious difference and the life of vacuum arc are about 0.02ms.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2008年第3期403-405,409,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50474012)
