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Zhang, Yong
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Publications (5/5 displayed)
- 2022The effect of grain size on the internal oxidation of Sm2Co17-type permanent magnetscitations
- 2017Field Deployment of Printed Carbon Nanotube Gas Sensor Arrays for Natural Gas Leak Detection
- 2016Quench sensitivity of Al-Mg-Si and Al-Zn-Mg-Cu alloys. Part 2: predictive modelling
- 2016Quantitative analysis of quench sensitivity of 7xxx alloys by using small angle X-ray scattering
- 2014Lattice-mismatched GaInP LED devices and methods of fabricating same
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article
The effect of grain size on the internal oxidation of Sm2Co17-type permanent magnets
Abstract
This work has examined the influence of grain size in sintered Sm<sub>2</sub>(Co,Fe,Cu,Zr)<sub>17</sub>-type permanent magnets on the growth of an internal oxidation zone (IOZ). Two magnets of similar composition but with average grain sizes of 46 μm and 170 μm respectively, were exposed to temperatures of 500 °C in air for times up to 1000 h. Overall, the smaller grained magnet showed a reduced growth rate of the IOZ (∼39.01 μm<sup>2</sup>h<sup>−1</sup>) compared to the larger grained magnet (∼48.95 μm<sup>2</sup>h<sup>−1</sup>) and a smaller irredeemable loss in Br (3.11%) after 1000 h. However, growth rate of the IOZ is shown to depend on the growth direction, in respect to the crystallographic c-axis of the matrix phase. The smaller grain size was shown to be most effective at retarding the growth of IOZ under surfaces parallel to the c-axis. It is proposed therefore, that a smaller grained sintered magnet may be the microstructure of choice for use in demanding, high temperature applications, where a protective coating is not always a possibility, such as a high-performance electrical machine with a surface mount PM rotor. Orientation of the exposed face must also be considered to minimise the resultant magnetic induction loss caused by oxidation.