液-液掺杂钼镧合金中的稀土相研究

Study on RE Phase of Mo-La Alloy Prepared by a Liquid-Liquid Doping Method

摘要:

采用液-液掺杂方式及溶胶-凝胶技术制备出稀土镧掺杂钼粉，经等静压、烧结制成掺镧钼坯。利用XRD、SEM、EDS、TEM等检测手段对不同加工态下材料的组织、形貌及稀土相进行了分析。结果表明：硝酸镧La(NO3)3溶液与仲钼酸铵(NH4)6Mo7O24·4H2O溶液发生化学反应生成钼酸镧La2(MoO4)3，经焙解和还原，稀土相以La2O3的形式存在于Mo粉中，并起到细化钼颗粒的作用；烧结成坯后，La2O3弥散分布在钼基体中

Abstract:

Lanthanum-doped molybdenum powder was prepared by a liquid-liquid doping method and sol-gel technique, and then the lanthanum-doped molybdenum billet was obtained by isostatic pressing and sintering. The microstructure, morphology and RE phases of the materials in different states were analyzed using XRD, SEM, EDS, TEM etc. The results show that a chemical reaction between La(NO3)3 and (NH4)6Mo7O24·4H2O generates La2(MoO4)3. After calcination and reduction, RE phase exists in the molybdenum powder in the form of La2O3 and can refine the powder particles. La2O3 distribute dispersively in the molybdenum matrix after sintering into a billet