((昆明理工大學(xué) 材料與冶金工程學(xué)院，昆明 650093))
摘 要: 研究二次發(fā)泡泡沫鋁工藝用熔體路徑發(fā)泡先驅(qū)體中TiH2的分散性，包括熔體粘度測量、工藝參數(shù)對發(fā)泡劑分散性影響等。結(jié)果表明，610 ℃是ZLD104合金熔體粘度變化的轉(zhuǎn)折點，低于610 ℃熔體粘度隨溫度的變化較大，高于610 ℃熔體粘度隨溫度的變化較小；隨分散溫度、攪拌速度、分散時間的提高，發(fā)泡劑分散均勻性提高，但在3 000 r/min，分散30 s的條件下，發(fā)泡劑的團(tuán)聚現(xiàn)象仍然存在；在粘度−溫度非敏感區(qū)分散發(fā)泡劑，并采用擠壓使發(fā)泡先驅(qū)體致密化，以及采用3 000 r/min以上的攪拌速度分散發(fā)泡劑，可提高熔體路徑發(fā)泡先驅(qū)體發(fā)泡劑均勻性。
關(guān)鍵字: TiH2發(fā)泡劑；熔體路徑先驅(qū)體；分散性；泡沫鋁
（(Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology,Kunming 650093, China)）
Abstract:The dispersion of TiH2 in the melt route precursor for two-step foaming process of aluminum foam was studied, including the measurement of aluminum melt viscosity, the effects of processing parameters on the dispersion of TiH2, etc. The results show that 610 ℃ is the key point of the temperature—viscosity relationship of aluminum foam. While the melt temperature is below 610 ℃, the viscosity elevates greatly with decreasing temperature. While melt temperature is above 610 ℃, the viscosity elevates slowly with decreasing temperature. The uniform of foaming agent is improved with increase of melt temperature, stirring speed and dispersing time. However, the aggregation of TiH2 still exists stirred at rotation speed 3 000 r/min for 30 s. Three approaches are found to be effective to improve the uniform of TiH2 in the melt route precursor: disperse TiH2 in the viscosity-temperature non-sensitive area of aluminum alloy, density the cast precursor by pressing, and use a rotation speed higher than 3 000 r/min.
Key words: TiH2 foaming agent; melt route precursor; dispersion; aluminum foam
