本文選題：難熔金屬粉末 + 氣流式霧化�。� 參考：《昆明貴金屬研究所》2017年碩士論文

【摘要】：難熔金屬材料是非常重要的金屬材料,難熔金屬及其合金材料的作用在某些方面(航天航空和國防軍工)是其他材料不可替代的,而難熔金屬及其合金粉末對制備難熔金屬材料的性能影響很大,且很多時候甚至都制約著難熔金屬材料的發(fā)展,所以制備出高性能的難熔金屬及其合金粉末對制備高性能難熔金屬材料至關(guān)重要。本文通過氣流式霧化法和煅燒還原法成功的制備了微米級球形Mo粉、Ru粉和W-Mo合金粉末,并對過程中的氯釕酸銨熱分解階段和霧化階段以及仲鉬酸銨的煅燒還原階段進行了研究。通過XRD檢測、TG-DSC檢測、SEM檢測、TG-DTA-MS檢測、高溫XRD檢測以及粒徑分析等檢測手段對該過程的粉末進行分析。結(jié)果表明,氯釕酸銨熱分解階段可分為兩段,255.0~314.0℃為第一段分解,產(chǎn)物為NH3、HCl和(NH3)4Ru3Cl12,314.0~360.9℃為第二段分解,產(chǎn)物為N2、HCl和Ru單質(zhì)。在霧化階段,霧化粉末的表面、形貌和粒徑受到氣液比、霧化溫度和溶液濃度的影響,且氣液比和霧化溫度影響著霧化粉末的表面和球形度,溶液濃度影響著霧化粉末的粒徑大小。在球形Mo粉制備過程中,制備的難熔金屬粉末的形貌、粒徑和比表面與升溫速率有關(guān),升溫速率越大粉末破碎越少,升溫速率大于10℃/min時破碎現(xiàn)象消失粉末為球形,且升溫速率與粉末粒徑大小成正比,與粉末比表面積成反比。最終成功的制備了微米級球形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，

本文編號：2034506