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Effect of Low-Pressure Sintering on Microstructure and Service Stability of NdFeB Magnets

College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China

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Sichuan Province Key Technology and Development Program of Panxi Experimental Area (2018KJT0040); Sichuan University Engineering Common Discipline Project (2020SCUNG201)

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    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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[Zhao Changyu, Liu Ying, Zhao Wei, Hou Henan, 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.]
DOI:10.12442/j. issn.1002-185X.20220178

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  • Received:March 07,2022
  • Revised:April 11,2022
  • Adopted:April 26,2022
  • Online: February 09,2023
  • Published: February 08,2023