摘要
采用非均匀成核和化学沉淀相结合的方法制备了MgFe2O4铁氧体原位包覆羰基铁超细复合粉体,对制备工艺及其抗氧化性能进行了研究.用综合热分析仪(TG-DSC)、X射线衍射仪(XRD)和扫描电镜(SEM)对粉体进行了表征.研究表明:沉淀剂NaOH溶液浓度为0.1 mol/L时前驱体的得率最高且包覆层最均匀;尖晶石型MgFe2O4在400℃时就已形成,600℃后MgFe2O4发生分解;400℃煅烧后,在羰基铁颗粒表面均匀地包覆了500 nm左右的鳞片n MgFe2O4;随着MgO掺量的增加,MgFe2O4的含量逐渐增加,羰基铁粉的抗氧化性逐渐增强,当MgO掺量的质量分数为25%时,粉体的氧化率仅为6.01%.
Ferrite MgFeO4 coated carbonyl iron composite powder was prepared by heterogeneous nucleation combined with the liquid deposition method to improve the oxidation resistance performance of carbonyl iron powder. The synthesized powder was analysed with TG DSC,XRD and SEM. The results indicated that the maximum yield and the most symmetrical coating layer were obtained when the concentration of NaOH solution was 0. 1 mol/L. Spinel-type MgF% 04 formed at 400 ℃ and decomposed evidently after 600 ℃. The well-proportioned coating layer of squamous MgF%04 formed on the surface of carbonyl iron was about 500 nm at 400 ℃. The content of spineltype MgFe2O4 increased and the oxidation resistance performance of the powder boosted up when the content of MgO increased. The oxidation rate of the powders decreased to 6.01% when the mass content of MgO was 25%.
出处
《南京工业大学学报（自然科学版）》
CAS
2008年第2期28-31,35,共5页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国防化工新材料重大科研基金资助项目
关键词
非均匀成核
MgFe2O4铁氧体
原位包覆羰基铁
抗氧化性
heterogeneous nucleation
ferrite MgFe204
in situ coated carbonyl iron
oxidation resistance performance
