高能机械研磨制备铁氧体的研究

PREPARATION OF FERRITE BY HIGH-ENERGY MECHANICAL MILLING

摘要

摘要:通过高能机械研磨的方法直接将ZnO和α-Fe ₂O ₃混合粉末合成尖晶石型铁氧体粉末，采用高能机械研磨和热处理相结合的工艺，由BaO、ZnO和α-Fe ₂O ₃制备超细晶的BaZn ₂Fe ₁₆O ₂₇型六角铁氧体，采用X射线衍射（XRD）分析不同研磨时间ZnFe ₂O ₄和BaZn ₂Fe ₁₆O ₂₇铁氧体形成的化学反应过程，研究发现ZnFe ₂O ₄反应过程分阶段进行，反应合成的ZnFe ₂O ₄铁氧体粉末的平均晶粒度小于10nm；通过机械研磨和热处理相结合的工艺可以制取晶粒尺寸为100~200nm的超细晶BaZn ₂Fe ₁₆O ₂₇铁氧体粉末。

Abstract:Spinel ferrite ZnFe ₂O ₄powders were synthesized directly from ZnO and α-Fe ₂O ₃mixtures by high-energy mechanical milling(HEMM). BaZn ₂Fe ₁₆O ₂₇(Zn ₂-W) ferrite powders were prepared by HEMM and subsequent heat treatment using the mixture of BaO,Zno and α-Fe ₂O ₃. X-ray diffraction (XRD) was used to investigate phase structure of powder obtained from the chemical reaction processing at different milling time. It has been found that the solid reactions between metal oxides take place step by step. Grain sizes of ZnFe ₂O ₄are less than 10nm. Ultrafine BaZn ₂Fe ₁₆O ₂₇(Zn ₂-W) ferrite powder (100nm~200nm) has been synthesized by HEMM and subsequent heat beatment.