(中南大學(xué) 冶金科學(xué)與工程學(xué)院， 長沙 410083)
摘 要: 研究了一種在泡沫鋁制備過程中可替代TiH2及ZrH2類發(fā)泡劑的新型發(fā)泡粉末的熱分解行為， 探討該新型發(fā)泡劑加入量及發(fā)泡溫度等因素對泡沫鋁孔隙率的影響。 研究表明： 該新型發(fā)泡材料具有分解溫度范圍寬及分解過程緩慢的特點(diǎn)。 當(dāng)采用該發(fā)泡劑時， 泡沫鋁制備過程無需額外加入金屬Ca類增粘劑； 隨發(fā)泡溫度的升高， 泡沫鋁的孔隙率先升高后下降； 隨發(fā)泡劑量的增多， 發(fā)泡體中的無泡層逐漸減少， 當(dāng)發(fā)泡劑的加入量在1.40%以上時， 發(fā)泡體中的無泡層消失； 在發(fā)泡溫度740 ℃、 發(fā)泡劑加入量1.40%～2.20%、 攪拌時間3 min、 保溫發(fā)泡時間5 min的條件下， 可以制備出孔徑2～5 mm， 孔隙率60%～80%， 孔隙基本均勻且無實(shí)心體的泡沫鋁。
關(guān)鍵字: 泡沫鋁； 發(fā)泡劑； 熱分解行為； 無泡層； 孔隙率
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: The thermal decomposition behavior of a novel foaming agent substituting for TiH2 and ZrH2 during the preparation process of aluminum foam was investigated. The effects of the foaming agent content and foaming temperature on the porosity of aluminum foam were also discussed. The experimental results show that the novel foaming agent has a wide decomposition temperature range and a slow decomposed rate; the extra viscosifier such as Ca is unnecessary while using this foaming agent; the porosity firstly increases and then decreases with foaming temperature rising; the free-bubble layer in material decreases with foaming agent addition increasing, and the free-bubble layer disappears while foaming agent addtion is more than 1.4%; an aluminum foam product characterized by no free-bubble layer, uniform bubble distribution, pore sizes of 2-5 mm and porosity of 60%-80% can be obtained under the conditions the foaming temperature 740 ℃, foaming agent addition 1.40%-2.20%, stirring time 3 min and foaming time 5 min.
Key words: aluminum foam; foaming agent; thermal decomposition behavior; free-bubble layer; porosity
