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应用科学学报 ›› 1990, Vol. 8 ›› Issue (1): 67-75.

• 论文 • 上一篇    下一篇

用热重-差热方法同时分析研究γ-Fe2O3磁粉热处理过程

崔保义, 杨志军, 姚堪怡   

  1. 上海科学技术大学
  • 收稿日期:1988-01-16 修回日期:1988-11-20 出版日期:1990-03-31 发布日期:1990-03-31

SIMULTANEOUS THERMAL ANALYSES OF γ-Fe2O3 MAGNETIC POWDER IN HEAT TREATMENT PROCESS

CUI BAOYI, YANG ZHIJUN, YAO KANYI   

  1. Shanghai University of Science and Technology
  • Received:1988-01-16 Revised:1988-11-20 Online:1990-03-31 Published:1990-03-31

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摘要： 由α-FeOOH通过热处理过程,经过脱水,还原,氧化三步,转变成γ-Fe2O3掌握适当的热处理方法,可以获得孔洞少、密度高、性能良好的γ-Fe2O3及其包复性磁粉.为了获得可靠的热处理技术,了解过程的理论机制,本文采用热重和差热同时分析,从能量角度对热处理过程中相变条件及封孔密实机制进行初步探讨.

Abstract: The most common process for making acicuiar particles of γ-Fe2O3 from hydrated ferric oxide α(FeO) OH involves three steps dehydration → reduction → oxidation. Mechanisms of the porefilling and the densification in the process of dehydration and conditions of phase transformation in reduction and oxidation periods have Loon investigated by means of simultaneous thermogravimetric and differential thermal analyses from the energy point of view on purpose to obtain the ideal technologicas process of heat treatment. The dense product of γ-Fe2O3 and coating with fewer porel and superior magnetic properties were obtained by the technological process which is better than the traditional one.