沈阳理工大学环境与化学工程学院;沈阳理工大学安全与应急产业技术研究院;
Al粉遇湿导致热失控,短时间放出氢气和大量热,反应剧烈且具有爆炸危险性。采用排水集气法研究不同等温条件下μAl-H_2O反应动力学特性;采用SEM和XRD技术揭示反应过程中μAl颗粒表面微观形貌、产物生成及产物层包裹下内部Al核心随反应温度及反应时间的动态变化规律。结果表明,μAl-H_2O反应分为三个阶段即:诱导阶段、热失控阶段和反应衰减阶段。与水接触后,Al_2O_3表面生成排列密集的AlOOH核,且缓慢聚集呈无定形凝胶状;热失控阶段,产氢速率曲线呈现双峰特性,表面产物层变为毛绒状蓬松多孔结构,厚度不断增加,随机交叠排列在颗粒表面,μAl-H_2O由外向内逐渐反应,铝核向内收缩;反应衰减阶段,生成的Al(OH)_3覆盖在AlOOH外表面形成不规则分层结构。原始Al样品衍射峰峰形尖锐,结晶度良好;反应开始后Al峰高逐渐降低,AlOOH和Al(OH)_3衍射峰出现且逐渐增高;反应结束时Al未完全消耗,与AlOOH和Al(OH)_3共存于产物中。
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基本信息:
DOI：10.20242/j.issn.2097-5384.2025.03.004
中图分类号:TQ116.2
引用信息:
[1]王鑫阳,崔铁军,王子健.微米级铝粉产氢动力学试验及微观形貌变化规律研究[J].有色金属(中英文),2025,15(03):368-375.DOI:10.20242/j.issn.2097-5384.2025.03.004.
基金信息:
国家自然科学基金资助项目（52004120）; 中国博士后科学基金资助项目（2020M670784）; 沈阳理工大学引进高层次人才科研支持计划资助~~