Relation between oxidation microstructure and the maximum energy product loss of a Sm2Co17 magnet oxidized at 500 ℃

doi:10.1088/1674-1056/20/12/127502

Abstract The oxidation microstructure and maximum energy product (BH)_max loss of a Sm(Co_0.76, Fe_0.1, Cu_0.1, Zr_0.04)₇ magnet oxidized at 500 ℃ were systematically investigated. Three different oxidation regions were formed in the oxidized magnet: a continuous external oxide scale, an internal reaction layer, and a diffusion zone. Both room-temperature and high-temperature (BH)_max losses exhibited the same parabolic increase with oxidation time. An oxygen diffusion model was proposed to simulate the dependence of (BH)_max loss on oxidation time. It is found that the external oxide scale has little effect on the (BH)_max loss, and both the internal reaction layer and diffusion zone result in the (BH)_max loss. Moreover, the diffusion zone leads to more (BH)_max loss than the internal reaction layer. The values of the oxidation rate constant k for internal reaction layer and oxygen diffusion coefficient D for diffusion zone were obtained, which are about 1.91 × 10^-10 cm²/s and 6.54 × 10^-11 cm²/s, respectively.

Keywords: Sm₂Co₁₇ magnet maximum energy product loss internal reaction layer diffusion zone

Received: 22 June 2011
Revised: 22 July 2011
Accepted manuscript online:

PACS:	75.50.Ww	(Permanent magnets)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	81.65.Mq	(Oxidation)
	66.30.-h	(Diffusion in solids)

Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2010AA03A401), the National Natural Science Foundation of China (Grant No. 51071010), the Aviation Foundation of China (AFC) (Grant No. 2009ZF51063), and the Fundamental Research Funds for the Central Universities.

Cite this article:

Liu Li-Li(刘丽丽) and Jiang Cheng-Bao(蒋成保) Relation between oxidation microstructure and the maximum energy product loss of a Sm₂Co₁₇ magnet oxidized at 500 ℃ 2011 Chin. Phys. B 20 127502

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Relation between oxidation microstructure and the maximum energy product loss of a Sm2Co17 magnet oxidized at 500 ℃

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Relation between oxidation microstructure and the maximum energy product loss of a Sm₂Co₁₇ magnet oxidized at 500 ℃