SmCo High Temperature Permanent Magnetic Materials with High Properties and Good Oxidation Resistance

AN Shizhong; ZHANG Tianli; JIANG Chengbao

doi:10.7527/S1000-6893.2014.0143

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2014 , Vol. 35 >Issue 10: 2794 - 2801

DOI: https://doi.org/10.7527/S1000-6893.2014.0143

Articles

SmCo High Temperature Permanent Magnetic Materials with High Properties and Good Oxidation Resistance

AN Shizhong ,
ZHANG Tianli ,
JIANG Chengbao

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School of Materials Science and Engineering, Beihang University, Beijing 100191, China

Received date: 2014-04-25

Revised date: 2014-07-07

Online published: 2014-07-12

Supported by

National Natural Science Foundation of China (51071010, 91016006)

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Abstract

Permanent magnetic materials capable of operating at high temperature up to 500 ℃ are required in aerospace field and modern industry. SmCo alloys are candidates for high temperature permanent magnets because of their high curie temperature, strong magnetocrystalline anisotropy field and high saturation magnetization field. However, the service temperature of commercial 2:17-type SmCo alloys cannot exceed 300 ℃. Our research focuses on 2:17-type SmCo high temperature permanent magnetic materials, 1:7-type nanocrystalline SmCo high temperature permanent magnetic materials and their oxidation protection. 2:17-type SmCo permanent magnets capable of operating at 500 ℃ and 550 ℃ are developed; anisotropy is achieved in the 1:7-type nanocrystalline SmCo alloys, 1:7-type nanocrystalline SmCo alloys show good stability of structure and magnetic properties at 500 ℃; and alloying and surface modification can effectively improve the oxidation resistance of the SmCo magnets.

Key words： permanent magnetic materials; SmCo alloys; high temperature; coercivity; oxidation resistance

Cite this article

AN Shizhong , ZHANG Tianli , JIANG Chengbao . SmCo High Temperature Permanent Magnetic Materials with High Properties and Good Oxidation Resistance[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(10) : 2794 -2801 . DOI: 10.7527/S1000-6893.2014.0143

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