碳酸钙制备小孔径中等孔隙率类球形孔泡沫铝及其合金  

Pores and spherel structure aluminium and alloy foamed technology with viscosity-controlling agent calclum carbonate

作　　者：魏永生[1] 褚旭明[1] 王辉[1] 丁龙[1] 何思渊[1] 何德坪[1] 

机构地区：[1]东南大学材料科学与工程学院,南京210096

出　　处：《材料科学与工艺》2010年第3期429-433,共5页Materials Science and Technology

基　　金：国家重点基础研究发展计划资助项目(2006CB601201)

摘　　要：与传统的Ca增黏与TiH2发泡的泡沫铝熔体发泡制备方法不同,CaCO3在铝熔体中可同时用作增黏剂和发泡剂.现有TiH2泡沫铝制备技术在制备小孔径类球形孔泡沫铝及合金方面存在困难,以轻质Ca-CO3颗粒为基础研制的新型泡沫铝增黏发泡剂,其热分解特性平缓,通过理论与实验确定了CaCO3在制备过程中的使用比例,分析了孔结构并讨论了CaCO3在铝熔体中的分解热力学问题,稳定制备出小孔径(0.4-1.1mm)、中等孔隙率(40-79%)的类球形孔泡沫铝及其合金.Not same as traditional Al foaming technology,CaCO3 can play dual roles as viscosity and foam agents which usually have been applied with Ca and TiH2.For investigation of decomposition dynamic characteristic,the decomposition model of CaCO3 enwrapped with Al melts was established.The results show that CaCO3 theoretical decomposition data matches the experimental,and the influence parameters also can be identified during the fabrication of Al foams with CaCO3 as foamed agents.Therefore,Al foams of similar sphere pores structure with diameter of 0.4-1.1% and porosity of 40-79% can be obtained steadily.

关 键 词：类球形孔 泡沫铝 碳酸钙 热分解 

分 类 号：TG146.2[一般工业技术—材料科学与工程]