以工业酒精为分散剂,采用搅拌法将0.7%(体积分数)含量的短C_f均匀分散到可发泡前驱体的混合物中,并成功制备了高稳定性的泡沫铝材料.利用300dpi扫描仪、SEM和EDX,结合液态金属泡沫排液模型和Plateau边界与薄膜之间压差对粉末冶金泡沫铝的泡沫稳定性进行了研究.结果表明,短C_f改善了同铝熔体之间的润湿性,并广泛分布于Plateau边界和泡壁内以及泡孔内表面上;面扫描中的Cu元素分布均匀,没有出现CuAl_2脆性相;短C_f的添加增加了熔体的表观粘度,因此减小了泡壁变薄速率和液态泡沫流动速率;通过在短C_f长度方向上改变Plateau边界和泡壁薄膜的曲率半径,减小了二者之间的压差.对于粉末冶金泡沫铝而言,短C_f是一种有效的外加稳定剂.
Short copper-coated carbon fibers with the content of 0.7vol% were dispersed uniformly into the mixture of foamable precursors using industrial alcohol as dispersant by stirring method and Al foams were also prepared. Connecting with the drainage model for liquid metal foams and the difference between Plateau borders and films, foam stability was investigated using the scanner with 300dpi, SEM and EDX. The results showed wetting behaviors with Al melt were improved due to short C_f, and short C_f were located into Plateau borders and cell walls or internal surface of pores widely. Element copper was distributed homogeneously and CuAl_2 phase did not existed. The rate of cell wall thinning and that of liquid flow were reduced effectively due to increase of the apparent viscosity of Al melt containing short C_f. The difference of Plateau borders and films was decreased by altering the curvature radius of them along the length direction of short C_f. Short C_f is an ex situ stabilizer for PM foams.
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