摘要
利用熔体吹气发泡法制备出了闭孔泡沫铝,观察了样品的表面形貌,并通过试验测试其力学性能;分析了发泡温度、Al2O3粉末体积分数对泡沫铝制备的工艺影响。试验结果表明:加入的Al2O3粉末必须达到一定的百分比,铝液中通入气体才会产生泡沫,在700℃和720℃时,Al2O3粉末体积分数的临界点分别为4%和6%;泡沫的稳定性随着温度的增高而降低;Al2O3体积分数越大,气体流量越大,泡沫铝孔径越大;但当Al2O3粉末体积分数超过20%时,很难发泡。
A closed-cell aluminum foam was processed by direct foaming with gas blowing into aluminum melt. Microstructure of the aluminum foam and its mechanical behavior were studied. The effects of melt temperature and volume fraction of Al2O3 particles on the stabilization of the aluminum foam were investigated. It is found that the critical volume fraction of Al2O3 particles is necessary for forming stable foams. At 700 ℃ and 720 ℃, the critical addition of Al2O3 particles is 4% and 6% respectively. The stability of the foam decreases with increasing the temperature of the melt. The pore size of the aluminum foam increases with increasing Al2O3 particle volume fraction and gas flow rate. It is difficult to form foams when the volume fraction of Al2O3 particles exceeds 20%.
出处
《铸造》
EI
CAS
CSCD
北大核心
2007年第8期814-818,共5页
Foundry
基金
铁道部-清华大学科技研究基金资助(T200402)
关键词
泡沫铝
吹气发泡
压缩性能
吸能性能
孔径
aluminum foam
gas injection foaming
compressive behavior
energy absorption
pore size
