高能机械研磨制备铁氧体的研究

通过高能机械研磨的方法直接将ZnO和α-Fe₂O₃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-Fe₂O₃制备超细晶的BaZn₂Fe₁₆O₂₇型六角铁氧体，采用X射线衍射（XRD）分析不同研磨时间ZnFe₂O₄和BaZn₂Fe₁₆O₂₇铁氧体形成的化学反应过程，研究发现ZnFe₂O₄反应过程分阶段进行，反应合成的ZnFe₂O₄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BaZn₂Fe₁₆O₂₇铁氧体粉末。

PREPARATION OF FERRITE BY HIGH-ENERGY MECHANICAL MILLING

Spinel ferrite ZnFe₂O₄ powders were synthesized directly from ZnO and α-Fe₂O₃ mixtures by high-energy mechanical milling(HEMM). BaZn₂Fe₁₆O₂₇(Zn₂-W) ferrite powders were prepared by HEMM and subsequent heat treatment using the mixture of BaO,Zno and α-Fe₂O₃. 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 ZnFe₂O₄ are less than 10nm. Ultrafine BaZn₂Fe₁₆O₂₇(Zn₂-W) ferrite powder (100nm~200nm) has been synthesized by HEMM and subsequent heat beatment.