氧化物凝胶在多孔金属铝中的沉积行为  

Oxide Gel’s Deposition Behavior in Porous Aluminum

作　　者：李振华[1] 任慧[1] 焦清介[1] 王晓宇[1] 

机构地区：[1]北京理工大学 爆炸科学与技术国家重点实验室,北京100081

出　　处：《稀有金属材料与工程》2013年第S1期268-272,共5页Rare Metal Materials and Engineering

基　　金：爆炸科学与技术国家重点实验室自主课题(QNKT12-03)

摘　　要：多孔铝是一种由金属基体和气孔组成的结构功能一体化的新型复合材料,具有密度小、孔隙率可调、强度高等优点。本研究尝试以多孔金属铝为基体,通过在孔内沉积氧化物凝胶得到复合材料,并对比了沉积前后材料的结构与性能变化。实验选择两种不同孔径的开孔泡沫铝作为骨架,以氧化物凝胶为客体,采用液相浸渍法将氧化铁沉积于多孔金属的孔隙中,从而形成一定比例的Al/Fe2O3复合产物。应用扫描电镜、微型断层扫描仪、压汞仪及热分析对装填前后复合体系的结构、形貌、孔隙率、热分解特性等进行了对比分析。结果证实,经过反复浸渍,氧化物凝胶可渗入泡沫铝孔隙,控制适宜的干燥方式维持凝胶骨架不坍塌,从而实现了两者的复合。分析结果显示:浸渍后原泡沫铝的孔隙率明显变小,其中小孔泡沫铝降低幅度更大,从92%降至13%,热分析实验表明多孔铝与氧化物凝胶复合产物的放热峰温为607℃,所得产物在结构含能材料领域具有潜在应用。Porous aluminum is a new kind of ACM (advanced composite material) which consists of metallic framework and pores. It has many advantages such as small density, adjustable porosity, and high strength. In the present work, the new complex was obtained by depositing iron oxide gel into the pores of porous template. Then, we compared the differences of porous aluminum when oxide gel was charged or not. Open-porous aluminum with two different pore sizes were selected as templates and iron oxide gel was embedding guest. A series of Al/Fe2O3 complexes were prepared via a liquid dipping method. The structure, morphology, porosity and thermal decomposition of two products were characterized by SEM, micrO CT (Computed Tomography), Mercury Porosimeter and DSC. The results prove that the oxide gel deposited into pores of porous aluminum and gel framework would not collapse with a proper drying method. Analysis results show that pore diameters and porosity of complexes decreased remarkably compared to porous aluminum. Particularly, the porosity of the complex with small pore diameter was reduced from 92% to 13%. Thermal analysis shows that the thermal decomposition temperature of complex is around 607℃. The new complexes have potential application in the field of structural energetic materials.

关 键 词：多孔材料 泡沫铝 Fe2O3凝胶 液相浸渍法 

分 类 号：TB383.4[一般工业技术—材料科学与工程]