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本文研究了超声气动雾化工艺条件(雾化介质Ar气压力、液态合金温度)和雾化器的几何参数对Al-5.6Zn-2.2Mg—1.7Cu-0.12Mn-0.6Co-0.3Ti—0.5Zr合金快速凝固粉末粒度分布和外观形貌的影响,同时还探讨了粉末颗粒大小与冷却速度之间的相互关系。用超声气动雾化装置制取的快速凝固Al-Zn—Mg—Cu系合金粉末,在雾化器几何参数一定的条件下,液态合金温度为820℃,雾化介质压力为3MPa时,可获得90%以上的粒度为40～200μm的球形粉末,相应的冷却速度为10~5～10~3K/s。在200μm以下的粉末平均尺寸约为60μm.
In this paper, the effects of ultrasonic aerodynamic atomization process conditions (Ar gas pressure, liquid alloy temperature) and atomizer geometry parameters on the microstructure and mechanical properties of Al-5.6Zn-2.2Mg-1.7Cu-0.12Mn-0.6Co-0.3Ti-0.5 Zr alloy rapid solidification powder size distribution and appearance morphology, but also discusses the relationship between the size of the powder particles and the cooling rate. The rapidly solidified Al-Zn-Mg-Cu alloy powder prepared by the ultrasonic pneumatic atomizing device can be obtained under the conditions of the atomizer geometric parameters, the liquid alloy temperature is 820 ℃ and the atomization medium pressure is 3MPa More than 90% of the spherical powder with particle size of 40 ~ 200μm, the corresponding cooling rate is 10 ~ 5 ~ 10 ~ 3K / s. The average size of the powder below 200 μm is about 60 μm.