| [Zhao Changyu,Liu Ying,Zhao Wei,Hou Henan and Li Jun.Effect of Low-Pressure Sintering on Microstructure and Service Stability of NdFeB Magnets[J].Rare Metal Materials and Engineering,2023,52(1):74~80.] |
| Effect of Low-Pressure Sintering on Microstructure and Service Stability of NdFeB Magnets |
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| Received:March 07, 2022 Revised:April 11, 2022 |
| DOI： |
| Key words: low-pressure-sintered NdFeB magnet microstructure temperature stability corrosion resistance |
| Foundation item:四川省攀西试验区关键技术与发展项目(No. 2018KJT0040)； 四川大学工科共性学科特色方向（No.2020SCUNG201） |
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| Abstract: |
| The internal relationship between the microstructure and service stability of NdFeB magnets was investigated. Results show that the NdFeB magnets after low-pressure sintering have significantly finer grains and more uniform distribution of the Nd-rich phase among the grains, which is beneficial to obtain smaller coercivity temperature coefficients of magnets, thereby improving the temperature stability. Compared with that of the magnets after vacuum sintering, the coercivity temperature coefficient of low-pressure-sintered magnets is reduced from -0.488%/°C to -0.472%/°C. However, the flow of the Nd-rich phase from the triangular grain boundary to the main phase intergranular area promotes the formation of complete network structure, which degrades the corrosion resistance of the magnets. The low-pressure-sintered magnets show more serious corrosion mass loss after immersion in 3.5wt% NaCl solution, presenting a stronger corrosion tendency. |
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