摘要
采用紧耦合气雾化制粉设备,研究了熔体过热度对紧耦合气雾化模式和粉末粒度的影响。实验中,保持其他气雾化工艺参数不变,熔体(金属铜)过热度分别设定为150,200,250和300 K,得到相应的粉末平均粒度分别为34.88,32.33,30.87和19.74μm。对雾化过程的理论分析结果表明:当熔体过热度从250 K提高到300 K时,液滴的破碎模式发生了改变,即由袋式转变为延展式,粉末粒度显著下降。但是,过热度的变化对雾化粉末粒度的正态分布规律没有明显影响;通过优化工艺参数,有潜力获取粒度更细、分布更均匀的粉末。
The effects of melt superheat(150～300 K) on the atomization process and particle size were investigated.The results show that when keeping other parameters constant,the Weber number of melt droplet increases obviously with the rise of melt superheat.As a result,droplet′s breakup mode changes and final particle size decreases.When melt superheat was set as 150,200,250 and 300 K,D(50) was 34.88,32.33,30.87 and 19.74 μm respectively,and the secondary breakup mode of droplet changes from bag to film stripping with superheat rising from 250 to 300 K,leading to the markable fall of particle size.However,the melt superheat does not have obvious influence on the normal distribution of particle size.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2006年第z2期84-88,共5页
Chinese Journal of Rare Metals
基金
国家自然科学基金资助项目(50574103)和(10476034)
关键词
雾化
紧耦合喷嘴
过热度
粉末
粒度
atomization
close-coupled nozzle
superheat
powder
particle size
