文档介绍：第 18 卷第 12 期中国有色金属学报 2008 年 12 月
The Chinese Journal of Nonferrous Metals Dec. 2008
文章编号:1004-0609(2008)12-2265-05
泡沫铝两步法制备工艺用新型发泡剂的热分解行为
周向阳,张华,刘希泉,刘宏专
(中南大学冶金科学与工程学院,长沙 410083)
摘要:研究一种适于两步法制备泡沫铝工艺用新型发泡剂的热分解行为,分析其分解过程中的动力学与热力
学特征,以及发泡气体与熔体之间可能存在的反应。研究表明:该新型发泡剂具有分解温度范围宽、分解过程
缓慢的特点;其在熔体中的发泡过程主要受化学反应控制;新型发泡剂所释放的氧化性气体与熔体发生反应,
在气泡表面所形成的连续氧化膜,对稳定气泡形貌、减缓气泡的合并和长大有重要作用;该新型发泡剂在两步
发泡法制备泡沫铝过程中表现出前期损耗率低、后期发泡效率高的优异性能。
关键词:泡沫铝;新型发泡剂;两步发泡法;热分解行为
中图分类号:TG 文献标识码: A
Thermal position behavior of novel gas-generating agent used
for two steps foaming process of aluminum
ZHOU Xiang-yang, ZHANG Hua, LIU Xi-quan, LIU Hong-zhuan
(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)
Abstract: The thermal position behavior of a novel gas-generating agent (NGGA) used for two steps foaming
process of aluminum was investigated, its ic and thermodynamic characteristics of position reactions, and
the potential reactions between the foaming gas and the melt were analyzed. The results show that the novel
gas-generating agent has a wide position temperature range and a slow posed rate, and its position
reactions during the melt are mainly controlled by chemical reaction process. The presence of an oxidizing gas released
by NGGA, leads to reactions with the liquid melt,