难熔金属Mo、Ru粉体的制备研究

发布时间：2018-06-18 06:23

  本文选题：难熔金属粉末 + 气流式雾化　； 参考：《昆明贵金属研究所》2017年硕士论文

【摘要】：难熔金属材料是非常重要的金属材料,难熔金属及其合金材料的作用在某些方面(航天航空和国防军工)是其他材料不可替代的,而难熔金属及其合金粉末对制备难熔金属材料的性能影响很大,且很多时候甚至都制约着难熔金属材料的发展,所以制备出高性能的难熔金属及其合金粉末对制备高性能难熔金属材料至关重要。本文通过气流式雾化法和煅烧还原法成功的制备了微米级球形Mo粉、Ru粉和W-Mo合金粉末,并对过程中的氯钌酸铵热分解阶段和雾化阶段以及仲钼酸铵的煅烧还原阶段进行了研究。通过XRD检测、TG-DSC检测、SEM检测、TG-DTA-MS检测、高温XRD检测以及粒径分析等检测手段对该过程的粉末进行分析。结果表明,氯钌酸铵热分解阶段可分为两段,255.0~314.0℃为第一段分解,产物为NH3、HCl和(NH3)4Ru3Cl12,314.0~360.9℃为第二段分解,产物为N2、HCl和Ru单质。在雾化阶段,雾化粉末的表面、形貌和粒径受到气液比、雾化温度和溶液浓度的影响,且气液比和雾化温度影响着雾化粉末的表面和球形度,溶液浓度影响着雾化粉末的粒径大小。在球形Mo粉制备过程中,制备的难熔金属粉末的形貌、粒径和比表面与升温速率有关,升温速率越大粉末破碎越少,升温速率大于10℃/min时破碎现象消失粉末为球形,且升温速率与粉末粒径大小成正比,与粉末比表面积成反比。最终成功的制备了微米级球形Mo粉、Ru粉和W-Mo合金粉末。
[Abstract]:Refractory metal materials are very important metal materials, and the role of refractory metals and their alloys is irreplaceable in some respects (aerospace, aviation and defense military industry). However, refractory metals and their alloy powders have great influence on the properties of refractory metal materials, and in many cases even restrict the development of refractory metal materials. Therefore, the preparation of high performance refractory metal and its alloy powder is very important for the preparation of high performance refractory metal materials. In this paper, micron spherical Mo powder Ru powder and W-Mo alloy powder were successfully prepared by gas flow atomization method and calcination reduction method. The thermal decomposition and atomization stage of ammonium chloride ruthenate and the calcination and reduction stage of ammonium paramolybdate were studied. The powder was analyzed by means of XRD, TG-DSC, SEM, TG-DTA-MS, high temperature XRD and particle size analysis. The results show that the thermal decomposition stage of ammonium ruthenate can be divided into two stages, the first stage is at 255.0C 314.0 鈩，

本文编号：2034506