溶液燃烧-钙还原法合成锆锰铁合金微粉

Synthesis of ZrMnFe fine-powder by solution combustion-calcium reduciton

以锆、锰、铁的硝酸盐和甘氨酸为原料,采用溶液燃烧法制得超细金属氧化物前驱体,再将前驱体分别在750、850和950℃由氢化钙还原得到锆锰铁三元合金微粉。用热重/差热分析法(TG/DTA)、X射线衍射(XRD)、扫描电镜(SEM)等对溶液燃烧和钙还原2个阶段的产物进行分析与表征。结果表明:采用溶液燃烧法合成的金属氧化物前驱体颗粒分布均匀,粒度为数百纳米;采用氢化钙还原氧化物前驱体,在温度≥850℃,Ar气氛下反应1 h可制得ZrMnFe三元单相合金微粉,粒度为亚微米或微米级。

Using zirconium nitrate,manganese nitrate,iron nitrate and glycin as reactants,ultra-fine metal oxide precursor was synthesized by solution combustion;the metal oxide precursor was reducted by calcium hydride at different temperature to form fine-powders of ternary alloy ZrMnFe.TG/DTA,XRD,SEM,EDS were used to characterize the as-burned and reduced products.The result show that the particles of oxide precursor synthesized by solution combustion distributed uniformly with sub-micron size.The metal oxide precursor could transform to single-phase ZrMnFe alloy powder with the size of sub-micron or micron in argon atmosphere within one hour with the reduction temperature no less than 850 ℃.