摘要
采用高速压制技术(HVC)制备W90骨架,然后在氢气炉中1400℃高温熔渗得到90W-10Cu复合材料。研究压制温度及压坯质量对压坯密度及显微形貌的影响。结果表明:随压制温度升高,压坯密度增大,在950℃高速压制可获得相对密度大于80.65%的W骨架,钨颗粒连接致密,分布均匀,孔隙联通性好。当压坯质量增加时,由于外加的能量密度减小,导致压坯密度减小。通过2次高速压制,压坯密度进一步提高;90W-10Cu材料的相对密度达99.5%,热导率175W/(m.K),气密性1×10-10Pa.m3.s-1,热膨胀系数(CTE)为6.74～7.41/(10-6K-1),各项指标均达到相应热沉材料的要求。
The 90W-10Cu composite materials were fabricated through fusion infiltration method at 1 400 ℃ in hydrogen atmosphere using 90W skeleton prepared by high velocity compaction（HVC） as based material. And the effects of pressing temperature and green compact quality on density and microstructure of the green compact have been studied. The results show that the density of the green compact increases with the increasing of pressing temperature. The 90W skeleton with relative density higher than 80.65% can be obtained by high velocity compaction at 950 ℃. In the 90W skeleton,W particles have good joint and equal distribution behaviors and pores owns good connectivity. The 90W-10Cu composites with relative density of 99.5%,thermal conductivity of 175 W/（m.K） and hermeticity of 1×10-10 Pa.m3.s-1 have been obtained.
出处
《粉末冶金材料科学与工程》
EI
2010年第1期27-31,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家高新工程重点项目(02-2002-021)
关键词
高速压制(HVC)
致密度
热导率
热膨胀系数
high velocity compaction （HVC） relative density thermal conductivity thermal expansion coefficient
作者简介
通讯作者：王志法，教授，博士。电话：13973138401；E—mail：nmrdc@mail．csut．edu．cn
