摘要
采用粉末冶金方法制得了ＦｅＮｉ／Ｃｕ粉末和ＦｅＮｉ／Ｃｕ纤维的低膨胀高导热（ＤＧ）复合材料．结果表明，随着Ｃｕ粉末尺寸增大，ＦｅＮｉ／Ｃｕ粉末制品电阻率减小，膨胀系数增大；而随着Ｃｕ纤维长径比增大，ＦｅＮｉ／Ｃｕ纤维制品的热膨胀系数和电阻率都增大．这是由Ｃｕ纤维和Ｃｕ粉末在制品中的分布状态，即Ｃｕ网络形成难易程度和ＦｅＮｉ与Ｃｕ互扩散难易程度共同决定的．当膨胀系数小于７×１０－６／Ｋ时，ＦｅＮｉ／Ｃｕ纤维制品比ＦｅＮｉ／Ｃｕ粉末制品的电导性能要好．
FeNi/Cu particle and FeNi/Cu fiber with low coefficient of thermal expansion (CTE) and high electrical conductivity composites are made by powder metallurgy in this paper. The results show that, with the increases of the size of Cu particle, the CTE increases while the electrical resistance decreases. On the other hand, with the increase of the ratio of length/radius, both the CTE and the electrical resistance increase. Those properties result from two reasons: one is the copper distribution condition in composite, and the other is the diffusion of Cu and FeNi. Under the condition of low CTE of 7×10 -6 /K, the electrical conductivity of FeNi/Cu fiber composite is higher than that of FeNi/Cu particle composite.
出处
《中南工业大学学报》
CSCD
北大核心
1998年第4期367-369,共3页
Journal of Central South University of Technology(Natural Science)
基金
湖南省自然科学基金
