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Vol.31, No.9, 1141 ~ 1147, 1993

Title

A Study on the Fabrication of the Iron Nitriding Powders

정영철Young Chul Jeong, 강신우Sin Woo Kang, 김영삼Young Sam Kim

Abstract

This paper describes the results on the fabrication of the iron-nitriding powders using the pickling acid of steel. The fabrication of iron-nitriding powders is easily proceeded when the ultra fine (75 angstrom) magnetite precipitated at pH 12, Fe^(2+)/Fe^(3+)=0.5 mol ratio in the pickling acid are reacted with the mixing gases of H₂ and NH₃. 1) Fe₄N powder was formed at 500℃ with the mixing ratio H₂/NH₃ of 1.0/0.2 to 1.0/0.4. Mixed Fe₄N and Fe₃N powders were obtained at 500℃ with the mixing ratio H₂/NH₃ of 1.0/0.6 to 1.0/0.8. 2) Iron-nitriding powders were fine sizes less than 0.3㎛ and nodular shape. 3) Maximum saturation magnetization among the iron-nitriding powder under this experimental is 178emu/g when Fe₄N formed at 590℃. The value of saturation magnetization is equivalent to 96% of theoretical Fe₄N.

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