(東北大學(xué) 材料與冶金學(xué)院， 沈陽 110004)
摘 要: 以熔體直接發(fā)泡法制備閉孔泡沫鋁材實(shí)驗(yàn)為基礎(chǔ)，通過獲得不同實(shí)驗(yàn)階段的泡沫鋁樣品， 以及對(duì)實(shí)驗(yàn)樣品切面或斷面進(jìn)行觀察和分析， 描述了在熔體發(fā)泡法制造泡沫鋁過程中TiH2加入熔體后的分解過程， 原始?xì)馀莸男纬煞绞揭约爱a(chǎn)生的氣泡和未分解TiH2的存在狀態(tài)； 解釋了氣泡進(jìn)一步長大的原因和未分解的TiH2如何釋放氣體； 表述了氣泡的合并和無泡層的形成。結(jié)果表明： 未分解的TiH2顆粒粘附在熔體內(nèi)形成的較小氣泡表面，即氣/液相界面上； 在恒溫發(fā)泡過程中氣泡壁上吸附的尚未分解的TiH2顆粒進(jìn)一步分解并向氣泡內(nèi)釋放氣體，使氣泡長大； 相鄰氣泡壁上的TiH2局部濃度較高并集中釋放氣體，導(dǎo)致氣泡壁破裂及氣泡間的合并。
關(guān)鍵字: 泡沫鋁； 閉孔型； 熔體發(fā)泡法； 氣泡
closed-cell aluminum foam
ZHANG Xiao-ming, WEI Li, WU Lin-li
（ School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract: The closed-cell aluminum foam was fabricated by direct foaming in melt. Through sampling aluminum foam in different stages the cross-section of them were observed and analyzed. It was explained how TiH2 was decomposed after entered into the melt, how initial bubbles were formed and what was the state that generated bubbles and undecomposed TiH2 lay in. The reason that why bubbles grew and how the gas was released from undecomposed TiH2 were stated. The merging of bubbles and formation of bubble-free layer were also described. The results show that the particles of undecomposed TiH2 adhere to the surface of small bubbles formed in the melt, that is on the surface of gas/liquid phase. During foaming of constant temperature, the particles of undecomposed TiH2 adhering to cell wall decompose and release gas into bubbles and make them grown up. If the local concentration of TiH2 of adjacent cell wall is high and it releases gas intensively, fracture of cell wall and merging of bubbles will be generated.
Key words: aluminum foam; closed cell; foaming in melt; bubble
