Thermal stability of Sm<sub>2</sub>Fe<sub>17</sub> alloy

DENG Gengfeng; SUN Guangfei; CHEN Jufang; FANG Keming

doi:10.13374/j.issn1001-053x.2007.04.018

Volume 29 Issue 4

Aug. 2021

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DENG Gengfeng, SUN Guangfei, CHEN Jufang, FANG Keming. Thermal stability of Sm2Fe17 alloy[J]. Chinese Journal of Engineering, 2007, 29(4): 390-393. doi: 10.13374/j.issn1001-053x.2007.04.018

Citation:

DENG Gengfeng, SUN Guangfei, CHEN Jufang, FANG Keming. Thermal stability of Sm₂Fe₁₇ alloy[J]. Chinese Journal of Engineering, 2007, 29(4): 390-393. doi: 10.13374/j.issn1001-053x.2007.04.018

DENG Gengfeng, SUN Guangfei, CHEN Jufang, FANG Keming. Thermal stability of Sm2Fe17 alloy[J]. Chinese Journal of Engineering, 2007, 29(4): 390-393. doi: 10.13374/j.issn1001-053x.2007.04.018

Citation:

DENG Gengfeng, SUN Guangfei, CHEN Jufang, FANG Keming. Thermal stability of Sm₂Fe₁₇ alloy[J]. Chinese Journal of Engineering, 2007, 29(4): 390-393. doi: 10.13374/j.issn1001-053x.2007.04.018

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Thermal stability of Sm₂Fe₁₇ alloy

doi: 10.13374/j.issn1001-053x.2007.04.018

1. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China;
2. Material and Chemical Engineering School, Jiangxi University of Science and Technology, Ganzhou 341000, China;
3. Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2006-01-29
Rev Recd Date: 2006-07-10

Available Online: 2021-08-16

Abstract

Abstract

The effects of particle size and heating rate on the thermal stability of Sm₂Fe₁₇ alloy were investigated by TG/DTA technique. Chemical reactions during the oxidation of Sm₂Fe₁₇ alloy were confirmed with XRD and TG/DTA results. The apparent activation energy of the oxidation of Sm₂Fe₁₇ alloy was calculated by the Kinssinger equation and the reaction mechanism was deduced. The results show that the thermal stability of Sm₂Fe₁₇ alloy decreases with the decrease in particle size; and the sooner the heating rate is, the higher temperature needs for Sm₂Fe₁₇ alloy being oxidized and the less thermal it gives out. Further studies indicate that the apparent activation energies of low-temperature oxidation and high-temperature oxidation of Sm₂Fe₁₇ alloy are 162 kJ·mol^-1 and 189.8 kJ·mol^-1, respectively.
- rare earth permanence magnet,
- thermal stability,
- activation energy,
- thermal analysis,
- X-ray diffraction analysis