Rheological and dynamic mechanical properties of polymer-bonded magnets based on Sm2Co17 and polyamide-12

Qadeer, Muhammad Ifran; Savage, S. J.; Gedde, Ulf W.; Hedenqvist, Mikael S.

doi:10.1007/s10853-014-8460-4

Cited by 11 publications

(2 citation statements)

References 32 publications

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“…Moving to Figure 4b, the relationship between η* and ɷ within diverse NdFeB/TPU/SAG samples is illustrated. The addition of the mass of magnetic fillers fairly increased the η* of the samples due to the formation of a gel‐like structure at high filler loading, with a possible yield point that needs to be overcome for deformation to occur 40 . Strikingly, the trend of η* variation aligns between the NdFeB/TPU/SAG and modified TPU samples upon SAG incorporation.…”

Section: Resultsmentioning

confidence: 88%

Tensile and heat resistance behavior of modified thermoplastic polyurethane elastomer in anisotropic neodymium‐iron‐born bonded magnet

Qu,

Wu,

et al. 2023

J of Applied Polymer Sci

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The emergence of anisotropic neodymium‐iron‐boron (NdFeB)‐bonded magnets with high energy density and freedom of shape design is effective in minimizing the dimensions and mass of electric motors. However, limitations in mechanical strength and heat resistance at elevated temperatures hinder their further application. To overcome these challenges, we present a novel approach to enhance the tensile strength and heat resistance of the NdFeB‐bonded magnet involving the modification of thermoplastic polyurethane (TPU) through the melt‐mixing method with a styrene–acrylonitrile‐glycidyl methacrylate terpolymer (SAG) modifier and engineered TPU was then employed in fabricating NdFeB‐bonded magnets via calendering molding. The microstructure of the magnets exhibited aligned NdFeB particles due to mechanical stress during calendering molding, which results in anisotropy. Interestingly, the magnetic properties of bonded magnets based on modified TPU remain almost the same compared to their unmodified counterparts, showcasing a maximum energy product of around 12 MGOe. The mechanical tests demonstrated a maximum 32.4% increase in the tensile strength of bonded magnets based on modified TPU. A progressive shift to a higher temperature (100 to 120°C) of magnet samples fractured occurs in the heat resistance measurement of the bonded magnets based on modified TPU, meaning improvement in heat resistance of NdFeB bonded magnets.

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Section: Resultsmentioning

confidence: 88%

Tensile and heat resistance behavior of modified thermoplastic polyurethane elastomer in anisotropic neodymium‐iron‐born bonded magnet

Qu,

Wu,

et al. 2023

J of Applied Polymer Sci

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“…Therefore, researchers have paid more attention to improve working temperature of bonded magnets by developing heat-resistant bonder. For instance, polyamide-12 [6], polycarbonate [7], nylon 66 [8], polyamide 6 [9] have been widely used. However, these polymers used as bonders cannot resist higher temperature above 150 o C [10].…”

Section: Introductionmentioning

confidence: 99%

Comparison and Analysis of Sodium Silicate and Epoxy Bonded NdFeB Magnets

Yin

Liu

et al. 2016

MSF

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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.

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Non leaching biomimetic antimicrobial surfaces via surface functionalisation of cellulose nanofibers with aminosilane

et al. 2016

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Rheological and dynamic mechanical properties of polymer-bonded magnets based on Sm2Co17 and polyamide-12

Cited by 11 publications

References 32 publications

Tensile and heat resistance behavior of modified thermoplastic polyurethane elastomer in anisotropic neodymium‐iron‐born bonded magnet

Tensile and heat resistance behavior of modified thermoplastic polyurethane elastomer in anisotropic neodymium‐iron‐born bonded magnet

Comparison and Analysis of Sodium Silicate and Epoxy Bonded NdFeB Magnets

Non leaching biomimetic antimicrobial surfaces via surface functionalisation of cellulose nanofibers with aminosilane

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