泡沫铝芯夹心板的制备及泡沫孔的研究

提出粉末致密化方法:将粉末放在待连接的两金属板之间进行轧制连接,然后直接在炉中进行发泡的方法·这种方法既克服了粘结剂连接的缺点,达到了冶金结合的目的;又使工艺过程缩短,节约了能源·对泡沫孔的形貌特征进行了研究,并对孔壁上钛的富集和皱褶进行了分析·研究表明,采用粉末与钢板轧制工艺可以成功地制备出钢面板泡沫铝夹心结构;发泡过程中孔的合并以及微孔的产生是影响孔结构的重要因素;钛颗粒在孔壁上的富集对孔的稳定性起到了一定的积极作用;凝固过程中孔壁上产生了弯曲和皱褶现象,所以对凝固过程的控制也是很重要的·

Preparation of Aluminum Foam Sandwich and Foam Cell

A new way to compact powder is proposed for preparation of aluminum foam sandwich, i.e., two metal plates are stacked and rolled together with Al-Si-Ca powder containing 1wt% TiH_2 foaming agent between them, which is then foamed in heating furnace. The new way not only gets rid of the disadvantage of adhesive bonding, so as to enable the metallurgical bonding to come true but also shortens the technological process and saves the energy. The morphology of the foam cell is investigated to analyze the enrichment of titanium and furrows on cell wall. The results show that rolling the powder together with steel plates can successfully form the structure of aluminum foam sandwich (AFS). The consolidation of pores and formation of the micro-pores are the main influencing factor on cell structure. The enriched titanium grains attaching to the cell wall serve a stabilization function for foam cell in foaming process, and the curved and/or furrowed cell walls are found in solidification process. So it is very important to control the solidification process.