Melt metal sheet breaking mechanism of close-coupled gas atomization  

作　　者：欧阳鸿武 黄伯云 陈欣 余文焘 

机构地区：[1]State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China

出　　处：《中国有色金属学会会刊：英文版》2005年第5期985-992,共8页Transactions of Nonferrous Metals Society of China

摘　　要：The gas atomization is the process that a liquid mass is disintegrated into a collection of liquid melt droplets by the impact of high velocity gas stream and solidified into metal particles. However, the liquid melt sheet breaking mechanism has not been fully understood. So the experimental research was carried out under the condition of lower melt superheat. The results reveal that there are three approaches about melt metal sheet’s breakage: from the edges of sheets, from inner surface of sheets, and disrupted by other droplets and sheets. The approach of melt sheet breakage is dependent on its thickness. The thicker sheets (above 25μm) are disintegrated mainly by the way of droplet’s departing from edges, and the thinner sheets (below 10μm) are chiefly breaking from the inner surface.The gas atomization is the process that a liquid mass is disintegrated into a collection of liquid melt droplets by the impact of high velocity gas stream and solidified into metal particles. However, the liquid melt sheet breaking mechanism has not been fully understood. So the experimental research was carried out under the condition of lower melt superheat. The results reveal that there are three approaches about melt metal sheet＇s breakage： from the edges of sheets, from inner surface of sheets, and disrupted by other droplets and sheets. The approach of melt sheet breakage is dependent on its thickness. The thicker sheets （above 25μm） are disintegrated mainly by the way of droplet＇s departing from edges, and the thinner sheets （below 10 μm） are chiefly breaking from the inner surface.

关 键 词：粉末冶金 流动结构 气压雾化 过热处理 

分 类 号：TG21[金属学及工艺—铸造]