Magnetic and Mechanical Properties of Strontium Ferrite and Nd-Fe-B Rubber Bonded Permanent Magnets

Przybylski, Marek; Ślusarek, B.; Bednarczyk, Tomasz; Chmiel, Grzegorz

doi:10.12693/aphyspola.136.685

Cited by 13 publications

(7 citation statements)

References 6 publications

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“…These particles do not have a coating. However, these particles are used as a raw material for NBR (nitrile butadiene-rubber)-bound permanent magnets in different applications [21]. For this reason, NBR is chosen as matrix, which was also done in previous studies with CIP [22].…”

Section: Methodsmentioning

confidence: 99%

Inductive and magnetorheological properties of soft and hard magnetic fillers in elastomers

Šimić,

Lang,

Klüppel

2023

Smart Mater. Struct.

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Magnetorheological elastomers are smart materials, that have great potential for many technical applications like intelligent semi-active dampers or energy harvesting applications. We investigate soft- and hard-magnetic filler types in typical technical elastomers under cyclic deformation regarding their influence on the electromagnetic induction and magnetic switching-ability of the compounds. The effect of vulcanization in an external magnetic field is considered leading to anisotropic samples with aligned filler particles. It is found that the soft magnetic fillers show a higher switching-ability compared to hard magnetic fillers in anisotropic samples, which is related to hysteretic and slow magnetization behaviour of hard magnetic fillers. This also leads to a negative switching effect or softening of the samples if the direction of the magnetic field is opposite to that during vulcanization, suggesting rotational motion of the particles in dependence of the outer field. The stress values and mechanical hysteresis are generally higher for the anisotropic samples, both for soft and hard magnetic fillers. This is found for quasistatic and dynamic excitations at different frequencies and can clearly be related to the alignment of particles. Nevertheless, the energy harvesting ability seems to be widely independent of this since no significant different inductive properties are found for isotropic and anisotropic samples. The possibility of a combined magnetorheological and energy harvesting application is discussed.

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Section: Methodsmentioning

confidence: 99%

Inductive and magnetorheological properties of soft and hard magnetic fillers in elastomers

Šimić,

Lang,

Klüppel

2023

Smart Mater. Struct.

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“…After all, the magnetic properties of composites depend on amount of the included magnetic powders [7,21].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…It is known that the magnetic properties of bonded magnets mainly depend on the species and content of the included magnetic powders [7]. For a given kind of magnetic particles, the higher magnetic properties of bonded magnets require higher content of the magnetic fillers [8], which used to greatly reduce the flowability of the compounds during manufacturing and affect the distribution of the additives as well.…”

Section: Introductionmentioning

confidence: 99%

Injection moldable, self-healable, and recyclable rubber-bonded NdFeB magnets with the magnetic particulates content up to 90 wt%

Cao

Zhu

Rong

et al. 2023

Adv Compos Hybrid Mater

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To apply the facile injection molding technique commonly used in thermoplastics processing to rubber-bonded magnets, typical highly filled thermosetting composites, an approach based on Diels-Alder (DA) chemistry is proposed by the authors. In the proof-of-concept experiments, the oligomers of hydroxyl-terminated polybutadiene rubber are successively functionalized by furyl and trifluoromethyl, and the magnetic NdFeB particles are modified by maleimide. By taking advantage of reversible DA reaction, crosslinkages are established among the treated polybutadiene oligomers and NdFeB particles. The composite exhibits very low viscosity due to de-crosslinking when heated to retro-DA reaction temperature, which provides the highly filled system with necessary thermal processibility. In addition, the fluorine groups of the rubber phase are aggregated surrounding the particulate fillers allowing for well separation of the latter in the melt state. During the subsequent cooling, the DA bonds are re-built up in the rubber and at the particles/rubber interface, respectively, offering the robustness of traditional thermosets. As a result, the polybutadiene-bonded magnets with NdFeB content up to 90 wt% can be injection molded and possess rather high magnetic properties, mechanical properties, self-healability and recyclability. The present work combines the merits of thermoplastics and thermosets, and satisfies the contradictory requirements of high filling, efficient manufacturing and balanced performance of functional polymer composites.

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“…Przybylski et al have developed strontium ferrites and Nd-Fe-B elastomer-bonded compounds. 6 These compounds have been magnetically and mechanically characterized. As filler, the strontium ferrite of the company Toda and the isotropic Nd-Fe-B of the company Magnequench were used.…”

Section: Introductionmentioning

confidence: 99%

Development of Nd-Fe-B rubber-bonded permanent magnets: Magnetic and mechanical characterization

Yaagoubi

Schwegler

2021

Journal of Elastomers & Plastics

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In this work, the mechanical and magnetic properties of a new Nd-Fe-B filled Hydrogenated nitrile butadiene rubber (HNBR) mixtures are investigated. The mass fraction of the magnetic particles was specifically modified to determine the magnetic and mechanical property trends. The particles have isotropic properties, so no magnetic fields are used for particle orientation during vulcanization. Increasing the filler concentration of the Nd-Fe-B powder leads to a reduction of the tensile strength and an increase in density, elongation at break and hardness of the mixture. The vulcanization times of the compound at different vulcanization levels show hardly any differences by changing the degree of filling. By increasing the filler content from 67% to 80%, the viscosity of the compound increases by a factor of 1.41, which has a strong influence on the processability of the material. Increasing the filling degree of the powder leads to an increase in remanence and the coercivity field strength HcB. For the coercivity field strength HcJ, hardly any change is detected due to the variation in filling level.

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Magnetic and Mechanical Properties of Strontium Ferrite and Nd-Fe-B Rubber Bonded Permanent Magnets

Cited by 13 publications

References 6 publications

Inductive and magnetorheological properties of soft and hard magnetic fillers in elastomers

Inductive and magnetorheological properties of soft and hard magnetic fillers in elastomers

Injection moldable, self-healable, and recyclable rubber-bonded NdFeB magnets with the magnetic particulates content up to 90 wt%

Development of Nd-Fe-B rubber-bonded permanent magnets: Magnetic and mechanical characterization

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