摘要
在氢气或氢气和氩气的混合高压气氛中，采用定向凝固技术制备了规则多孔铜材料。测试了不同气孔率的规则多孔铜在平行和垂直气孔方向上的热膨胀系数；研究了气孔、气孔方向和气孔率对其热膨胀系数的影响规律，并对其规律做了理论预测。结果表明，规则多孔铜的热膨胀系数随着温度升高先急剧增大到一定值后趋于平稳；温度在40～130℃，气孔中存在闭孔时，规则多孔铜的CTE值随气孔率的增大而缓慢增大，且比纯铜时略大；当气孔主要以通孔形式存在时，气孔率与孔径的比值越大，规则多孔铜的CTE值越低。温度〉130℃时，规则多孔铜的热膨胀系数与纯铜的几乎相同，气孔的存在对铜的膨胀无明显影响。
Ordered porous copper with elongated pores has been fabrication by a unidirectional solidification method under a pressurized gas mixture of hydrogen and argon. The measurements were performed with different porosity of ordered porous copper, the coefficients of thermal expansion （CTE） of the metal with the existence and distribution of pores and its effects factors were analyzed from both theoretical predictions and experimental. The results show that the CTE of ordered porous copper increase rapidly to a constant value after with the increase in temperature. When the temperature is between 40 and 130℃ and the majority of pores are clogged, the CTE of ordered porous copper increase slowly in porosity and large than pure copper. In case of the most of pores are penetrated, the larger relative value of porosity and pores diameter, the lower CTE of ordered porous copper. When the temperature is over 130℃ ,the CTE of lotus metals does not depend on the existence of the pores, the CTE of lotus metals is in agreement with that of the matrix metals.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第B04期341-345,共5页
Journal of Functional Materials
基金
国家自然科学基金云南联合基金资助项目(u0837603)
关键词
定向凝固
规则多孔铜
气孔率
热膨胀系数
unidirectional solidification
ordered porous metal
porosity
the coefficient of thermal expansion
