摘要
对采用粉末冶金法制备泡沫铝材料过程中气泡稳定性对发泡效果的影响进行了研究,对影响气泡稳定的因素进行了分析.确定熔体的黏度与氢化钛分解是决定气泡稳定的主要因素.采用在铝硅合金粉末中加钙来增加熔体黏度,控制熔体的表面张力;通过控制氢化钛加入量来控制氢化钛分解释放出氢气的量;控制发泡时间,使发泡在气泡的稳定时段内进行;保持气泡内气体压力与气泡表面张力的平衡,可获得孔结构均匀、密度适合的泡沫铝材料.
The influence of foaming effect on bubble stability of foam aluminum prepared by powder metallurgy was studied, with relevant influencing factors analysed. The results showed that the melt viscosity and decomposition of TiH2 are the two predominant factors on which the bubble stability depends. The melt viscosity is improved by adding calcium in Al-Si alloy powder so as to control the surface tension of the melt. The hydrogen emitted from the decomposition of controlled by TiH2 addition. The foaming process is controlled in a period of bubble stability by controlling the foaming time. Keeping the balance between gas pressure inside bubbles and their surface tension will get the foam Al with even porosity and appropriate density.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第11期1090-1092,共3页
Journal of Northeastern University(Natural Science)
基金
国家高技术研究发展计划项目(2002AA334060)
关键词
粉末冶金
泡沫铝
气泡
熔体黏度
稳定性
氢化钛分解
powder metallurgy
foam Al
bubble
melt viscosity
stability
TiH2 decomposition
