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19.74 μm.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.
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