Comparison and Analysis of Sodium Silicate and Epoxy Bonded NdFeB Magnets

Sodium silicate bonded and epoxy bonded magnetic NdFeB materials are fabricated, respectively. The magnetic properties, temperature coefficient, heat-corrosion and compressive strength of both bonded magnets are investigated. Results reveal that sodium silicate bonded magnet has a similar comprehens...

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Published inMaterials Science Forum Vol. 852; pp. 136 - 141
Main Authors Liu, Wei Qiang, Yin, Yu Xia, Yue, Ming, Hu, Rui Jin, Zhen, Zhi Chao
Format Journal Article
LanguageEnglish
Published Pfaffikon Trans Tech Publications Ltd 01.04.2016
Subjects
Bonding
Bonding strength
Coefficients
Compressive strength
Curie temperature
Magnetic properties
Magnets
Materials research
Materials science
Mechanical properties
Plasma sintering
Polymers
Sodium silicates
Compressive Strength
Sodium Silicate
Heat-Corrosion
Bonded NdFeB Magnet
Epoxy
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Summary:Sodium silicate bonded and epoxy bonded magnetic NdFeB materials are fabricated, respectively. The magnetic properties, temperature coefficient, heat-corrosion and compressive strength of both bonded magnets are investigated. Results reveal that sodium silicate bonded magnet has a similar comprehensive property to epoxy bonded one. Compared to the epoxy bonded magnets, the sodium silicate bonded NdFeB has better temperature coefficient between 20 and 100 °C. The α value of the sodium silicate bonded NdFeB is-0.127 %/°C while the β value is-0.275 %/°C between 20 and 200 °C. DSC thermogram shows that sodium silicate as a bonder in magnet could exist at a higher temperature (above 1000 °C), which is far bigger than the curie point of NdFeB magnet powder. The weight gains of sodium silicate bonded magnet obtained in heat-corrosion resistance test are smaller than those of epoxy bonded one. Compressive strength test shows that sodium silicate bonded magnet has a larger compressive strength (35 MPa) than that of epoxy bonded magnet (27 MPa). Compared to the epoxy, the sodium silicate as bonder in the bonded magnet shows more compact. As a result, the sodium silicate bonded NdFeB bears better magnetic properties, temperature coefficient, heat-corrosion resistant and compressive strength.
Bibliography:Selected, peer reviewed papers from the China Functional Material Technology and Industry Forum CFMTIF 2015, October 30th - Novemnber 1th, 2015
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ISBN:9783038357551
3038357553
ISSN:0255-5476
1662-9752
1662-9752
DOI:10.4028/www.scientific.net/MSF.852.136