Characterization of iron nitride powders formed by mechanical alloying and atmospheric heat treatment techniques

Chung Kwei Lin; Giin Shan Chen; Jium Shyong Chen; Tsung Shune Chin; Pee Yew Lee

Characterization of iron nitride powders formed by mechanical alloying and atmospheric heat treatment techniques

Chung Kwei Lin, Giin Shan Chen, Jium Shyong Chen, Tsung Shune Chin, Pee Yew Lee

Research output: Contribution to journal › Article › peer-review

Abstract

Iron nitrides were manufactured by mechanical alloying of Fe_2.33N and Fe powder mixtures at starting compositions of Fe₁₂N₂ and Fe₁₆N₂ and annealed in air at 200 and 240°C. It was found that the supersaturated nanocrystalline α-Fe solid solution phase was produced after MA, and iron nitrides were formed after heat treatment. The saturation magnetization (σ) of the heat-treated powders is higher than those of the as-milled powders. The σ values for the specimens heat treated at 200°C are higher than those heat treated at 240°C, and the highest value among all of the samples is 218 e.m.u./g which is obtained by annealing of as-milled Fe₁₂N₂ powders in air at 200°C for 6 hours. The possible existence of the α"-Fe₁₆N₂ phase is responsible for the high saturation magnetization in mechanically alloyed Fe₁₆N₂ and Fe₁₂N₂ powders.

Original language	English
Pages (from-to)	753-760
Number of pages	8
Journal	Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an
Volume	24
Issue number	6
Publication status	Published - Nov 2001
Externally published	Yes

Keywords

Heat treatment
Iron nitrides
Mechanical alloying
Saturation magnetization

ASJC Scopus subject areas

Engineering(all)
Engineering (miscellaneous)

Cite this

Characterization of iron nitride powders formed by mechanical alloying and atmospheric heat treatment techniques. / Lin, Chung Kwei; Chen, Giin Shan; Chen, Jium Shyong et al.
In: Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an, Vol. 24, No. 6, 11.2001, p. 753-760.

Research output: Contribution to journal › Article › peer-review

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title = "Characterization of iron nitride powders formed by mechanical alloying and atmospheric heat treatment techniques",

abstract = "Iron nitrides were manufactured by mechanical alloying of Fe2.33N and Fe powder mixtures at starting compositions of Fe12N2 and Fe16N2 and annealed in air at 200 and 240°C. It was found that the supersaturated nanocrystalline α-Fe solid solution phase was produced after MA, and iron nitrides were formed after heat treatment. The saturation magnetization (σ) of the heat-treated powders is higher than those of the as-milled powders. The σ values for the specimens heat treated at 200°C are higher than those heat treated at 240°C, and the highest value among all of the samples is 218 e.m.u./g which is obtained by annealing of as-milled Fe12N2 powders in air at 200°C for 6 hours. The possible existence of the α{"}-Fe16N2 phase is responsible for the high saturation magnetization in mechanically alloyed Fe16N2 and Fe12N2 powders.",

keywords = "Heat treatment, Iron nitrides, Mechanical alloying, Saturation magnetization",

author = "Lin, {Chung Kwei} and Chen, {Giin Shan} and Chen, {Jium Shyong} and Chin, {Tsung Shune} and Lee, {Pee Yew}",

year = "2001",

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T1 - Characterization of iron nitride powders formed by mechanical alloying and atmospheric heat treatment techniques

AU - Lin, Chung Kwei

AU - Chen, Giin Shan

AU - Chen, Jium Shyong

AU - Chin, Tsung Shune

AU - Lee, Pee Yew

PY - 2001/11

Y1 - 2001/11

N2 - Iron nitrides were manufactured by mechanical alloying of Fe2.33N and Fe powder mixtures at starting compositions of Fe12N2 and Fe16N2 and annealed in air at 200 and 240°C. It was found that the supersaturated nanocrystalline α-Fe solid solution phase was produced after MA, and iron nitrides were formed after heat treatment. The saturation magnetization (σ) of the heat-treated powders is higher than those of the as-milled powders. The σ values for the specimens heat treated at 200°C are higher than those heat treated at 240°C, and the highest value among all of the samples is 218 e.m.u./g which is obtained by annealing of as-milled Fe12N2 powders in air at 200°C for 6 hours. The possible existence of the α"-Fe16N2 phase is responsible for the high saturation magnetization in mechanically alloyed Fe16N2 and Fe12N2 powders.

AB - Iron nitrides were manufactured by mechanical alloying of Fe2.33N and Fe powder mixtures at starting compositions of Fe12N2 and Fe16N2 and annealed in air at 200 and 240°C. It was found that the supersaturated nanocrystalline α-Fe solid solution phase was produced after MA, and iron nitrides were formed after heat treatment. The saturation magnetization (σ) of the heat-treated powders is higher than those of the as-milled powders. The σ values for the specimens heat treated at 200°C are higher than those heat treated at 240°C, and the highest value among all of the samples is 218 e.m.u./g which is obtained by annealing of as-milled Fe12N2 powders in air at 200°C for 6 hours. The possible existence of the α"-Fe16N2 phase is responsible for the high saturation magnetization in mechanically alloyed Fe16N2 and Fe12N2 powders.

KW - Heat treatment

KW - Iron nitrides

KW - Mechanical alloying

KW - Saturation magnetization

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Characterization of iron nitride powders formed by mechanical alloying and atmospheric heat treatment techniques

Abstract

Keywords

ASJC Scopus subject areas

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