溶液燃烧-氢还原法制备超细铁粉的水分解反应动力学研究  

Water decomposition kinetics of ultra-fine iron powder synthesized by solution combustion-hydrogen reduction

作　　者：姚勇[1] 罗德礼[1] 黄志勇[1] 徐清英 熊仁金[1] 张志[1] 宋江锋[1] 

机构地区：[1]中国工程物理研究院材料研究所,绵阳621907

出　　处：《粉末冶金材料科学与工程》2015年第4期491-498,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：中国磁约束核聚变能研究专项(2011GB112000)

摘　　要：针对氚化水分解处理需求,采用溶液燃烧-氢还原法制备超细铁粉,采用恒温热重法对不同粒度铁粉及不同比例锆、铑掺杂改性的铁粉进行水分解动力学研究。结果表明:采用溶液燃烧-氢还原法制备的铁粉粒度为纳米级,其水分解反应动力学性能明显优于微米级羰基铁粉和还原铁粉;添加锆元素后铁粉具有明显的抗烧结性能,锆的优化添加量(原子分数,以下同)是10%;10%Zr-Fe粉中添加铑元素后水分解反应速率显著提高,优化添加量是1%。10%Zr-1%Rh共掺杂铁粉具有优良的水分解动力学性能和循环稳定性,这是由于锆以网状ZrO2纳米线的形式包裹铁粉颗粒,阻止其烧结长大;铑分布于颗粒表面,对水分子分解起催化作用。Aimed to meet the requirement of tritiated water decomposition, ultra-fine iron powder was synthesized by solution combustion combined with hydrogen reduction method, and the kinetics of water decomposition was investigated by isothermal thermogravimetry. The results show that the iron powder synthesized by solution combustion combined with hydrogen reduction is in nanometer size, and the reaction rate of water decomposition is much higher than that of the micrometer powders. The addition of zirconium element can enhance the anti-sintering ability dramatically and the optimized additive ratio is 10%; the addition of rhodium element into 10%Zr-Fe can improve the reaction rate significantly and the optimized amount is 1%. The iron powder with the addition of 10% zirconium and 1% rhodium has the good performance both for water decomposition and for cyclic stability. Zr exists in the form of ZrO2 nanowires to encapsulate iron particles and inhibit sintering, and Rh acts as catalyst to enhance the splitting of water molecular.

关 键 词：溶液燃烧-氢还原 超细铁粉 水分解动力学 锆、铑改性 

分 类 号：O643.1[理学—物理化学]