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On high-temperature oxidation and protection of 2:17-type SmCo-based magnets
Peng, Xiao; Zhao, Hongbo; Wang, Xiaolan; Guo, Zhaohui; Li, Wei; Wang, Fuhui; xpeng@imr.ac.cn
2015
Source PublicationCORROSION REVIEWS
ISSN0334-6005
Volume33Issue:42433Pages:139-150
AbstractSm-2(Co,Cu,Fe,Zr)(17) are the best high-temperature permanent magnets because of their high Curie temperature (800 degrees C-850 degrees C). However, irreversible and unacceptable coercivity losses retard their use in applications at temperatures over 550 degrees C. The coercivity loss has been correlated with poor oxidation resistance at high temperatures. The current research progress on the effect of oxidation and its prevention, for 2:17-type magnets, is reviewed. Oxidation in air at 500 degrees C-700 degrees C causes the magnets to form three regions: (1) an external oxide scale mainly consisting of (CoxFe1-x)(3)O-4, (2) a thicker internal oxidation zone where the typical cellular precipitation (2:17R cell and 1:5H cell boundary) structure has been completely collapsed due to the Sm oxidation into Sm2O3, and (3) an oxidation-free zone where the cellular precipitates remain unchanged in lattice structure. No unacceptable coercivity loss is seen in the oxidation-free zone. Its thickness can be impressively increased within the magnets at high temperature, when they are covered with surface diffusion barriers for oxygen from the atmosphere, such as thin films of Cr2O3, Al2O3, and the metals with the ability to thermally grow these oxides.
description.department[peng, xiao ; zhao, hongbo ; wang, xiaolan ; wang, fuhui] chinese acad sci, inst met res, lab corros & protect, shenyang 110016, peoples r china ; [guo, zhaohui ; li, wei] cent iron & steel res inst, div funct mat, beijing 100081, peoples r china
KeywordCoating Coercivity High-temperature Magnet Magnetic Properties Oxidation
Funding OrganizationNational Basic Research Program of China, Ministry of Science and Technology [2010CB934604]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/75030
Collection中国科学院金属研究所
Corresponding Authorxpeng@imr.ac.cn
Recommended Citation
GB/T 7714
Peng, Xiao,Zhao, Hongbo,Wang, Xiaolan,et al. On high-temperature oxidation and protection of 2:17-type SmCo-based magnets[J]. CORROSION REVIEWS,2015,33(42433):139-150.
APA Peng, Xiao.,Zhao, Hongbo.,Wang, Xiaolan.,Guo, Zhaohui.,Li, Wei.,...&xpeng@imr.ac.cn.(2015).On high-temperature oxidation and protection of 2:17-type SmCo-based magnets.CORROSION REVIEWS,33(42433),139-150.
MLA Peng, Xiao,et al."On high-temperature oxidation and protection of 2:17-type SmCo-based magnets".CORROSION REVIEWS 33.42433(2015):139-150.
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