EDTA-氨联合络合法制备纳米86.2W-13.1Fe-0.7Ni复合粉体

Preparation of nano86.2W-13.1Fe-0.7Ni composite powder by combined EDTA-NH₃ complexing process

摘要: 以硝酸镍、硝酸亚铁和偏钨酸铵为原料，氨水和EDTA为络合剂，SDS为表面活性剂，采用络合沉淀法制备WO₃-Fe₂O₃-NiO前驱体，再经800 ℃、60 min氢气还原得到纳米86.2W-13.1Fe-0.7Ni复合粉体.研究反应pH值和反应时间对前驱体粉末组成、形貌及粒度的影响.结果表明：pH=8.0、水浴时间为60 min时，可获得成分稳定、平均粒度为1.16 μm的近球形微团聚WO₃-Fe₂O₃-NiO前驱体.还原后的86.2W-13.1Fe-0.7Ni复合粉体，具有椭球状的颗粒形貌，粒度为80~100 nm，物相由W和Fe₃Ni₂两相构成.

Abstract: WO₃-Fe₂O₃-NiO precursor powder was prepared via the EDTA-NH₃ complexing process using nickel nitrate, ferrous nitrate and ammonium tungstate as raw materials, and SDS as surfactant. Then the nano 86.2W-13.1Fe-0.7Ni composite powder was prepared successfully at 800 ℃ for 60 minutes in H2 atmosphere. The effects of pH and reaction time in the mean particle size, morphology and composition of precursor were investigated. The results show that the reunited and nearly spherical WO₃-Fe₂O₃-NiO precursor in the average particle size of 1.16 μm and stable morphology could be obtained by reacting for 60 minutes at pH of 8.0. As a result, the nano 86.2W-13.1Fe-0.7Ni composite powder has an ellipsoidal particle morphology in a particle size of 80~100 nm, which is consisted of W and Fe₃Ni₂.