纯铝基泡沫铝材料的制备工艺

用熔体发泡法制备纯铝基泡沫铝.采取快速搅拌加发泡剂的方法,解决了在高于纯铝熔点温度下,发泡剂分解速度快而不利于均匀混合到熔体中的难点;重点研究了发泡时间对制得的纯铝基泡沫铝质量的影响.研究表明,制备质量优良的纯铝基泡沫铝材料的最佳工艺条件为:增黏剂金属钙的加入量为2%~3%;增黏搅拌时间为4~5 min;发泡剂的加入量为1.0%~1.5%;加发泡剂时熔体的温度为690~700℃;搅拌速度为1500~1800 r/min,搅拌时间为3 min,发泡剂控制在1.5 min内加完,发泡时间为4~5 min;自然冷却法冷却.压缩性能的检测结果表明,纯铝基泡沫铝的压缩强度比Al-Si合金泡沫铝的压缩强度...

On the Preparation Process of Foamed Pure Aluminum

The foamed pure Al was prepared by way of melt foaming process. Rapid stirring to add foaming agent was used to address the difficulty that the high decomposition rate of foaming agent is unfavorable to mixing the agent homogeneously into melt when the temperature is higher than the melting point of pure Al. How the foaming time affects the quality of the foamed pure Al was investigated. The results showed that the optimal processing parameters for the preparation of high-quality foamed pure Al are as follows: the adding amount of metallic Ca as viscosifier is 2-3wt%, stirring time for favorable viscosifying effect 4-5 min, adding amount of foaming agent 1.0-1.5wt% when the melt temperature is 690-700°C, stirring speed 1500-1800 rpm, stirring time 3 min, foaming agent adding time within 1.5 min and foaming time 4-5 min. Then, the foamed pure Al just prepared is cooled naturally. The compressibility test results revealed that although compressive strength of foamed pure Al is much lower than that of Al-Si alloy foam, the former is a typical plastic foam material which provides a wide range of plasticity.