Development for New Method of Preparation of Fine particles utilizing Splashing phenomena in Molten Metal with Ammonia gas.

在以往的研究中，熔融金属在反应气流中的蒸发，它被发现，熔融铜飞溅时，它被保持在氨气。飞溅现象给了我一个新的想法，生产精细的金属颗粒。并将新方法命名为“氨溅法”。“在这项研究中，作为用氨溅射法制备细颗粒的基础研究，研究了在氨气气流中保持的熔融金属的溅射行为，以澄清熔融合金的温度、合金元素的含量、氨气流量和气体混合物中氨的摩尔分数对溅射速率、即生产速率和所获得颗粒的特性。熔融的纯银、铅和铋不被溅射，但熔融的铜和锡被溅射。随着合金元素含量的增加，铜锡、锡银、锡铅、锡银、锡铋、锡铅、锡铜合金的飞溅率降低。飞溅率随氨气流量的增大和合金液温度的升高而增大。氨+氢混合气中的飞溅率大于氨+氩和氨+氮混合气中的飞溅率。飞溅率随氨的摩尔分数的增加而增大，飞溅得到的颗粒为球形金属颗粒，粒径为0.1 ~ 150 μ m。粒径较大的颗粒内部有孔洞。颗粒的平均粒径随合金元素含量的增加和合金熔体温度的升高而增大。此外，它的增加与增加之间的距离熔体表面和用于引入氨的喷枪的尖端。

In previous studies on evaporation of molten metals in reactive gas flows, it was found that molten copper was splashed when it was held in ammonia gas. The splashing phenomena gave me a new idea for producing fine metallic particles. Then I named the new method "ammonia splashing method." In this study, as a fundamental study on the preparation of the fine particles with the ammonia splashing method, the splashing behavior of molten metals that were held in ammonia gas flows was investigated in order to clarify the effects of the temperature of the molten alloy, the content of the alloying element, ammonia gas flow rate, and the molar fraction of ammonia in gas mixture on both the rate of splash, i.e. the production rate, and characteristics of the obtained particles.Molten pure silver, lead and bismuth were not splashed, but molten copper and tin were splashed. The splash rates of copper-tin, -silver, -lead alloys and tin-silver, - bismuth, -lead, -copper alloys decreased with increasing the content of alloying element. The rate of splash increased with increasing ammonia gas flow rate and with rising the temperature of molten alloy. The rate of splash in ammonia + hydrogen gas mixture was larger than that in ammonia + argon and + nitrogen. The rate of splash increased with molar fraction of ammonia in the gas mixtures.The gotten particles by the splash were spheric and metallic, The size of the particles ranged to 0.1 - 150 mu m. The particles with relatively large size had cavities. The mean particle diameter of the particles increased with increasing the content of alloying element and with rising the temperature of the molten alloy. Also, it increased with increasing the distance between the melt surface the and the tip of the lance for introduction of ammonia.