Magnetic-aligned, magnetite-filled epoxy composites with enhanced thermal conductivity

Gąska, Karolina; Kmita, Grzegorz; Rybak, Andrzej; Sekuła, Robert; Goc, Kamil; Kapusta, Cz.

doi:10.1007/s10853-014-8809-8

Cited by 38 publications

(35 citation statements)

References 28 publications

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“…The thermal conductivity was measured under high vacuum (10 -6 Torr) under a steady state not only at room temperature, but also as a function of temperature, starting from cryogenic temperatures, specifically 2 K. The control software uses a special algorithm to optimize measurements parameters, such as heat pulse duration, heater current, and frequency. A more detailed description of the PPMS measuring method can be found in the literature [11,31]. The obtained core-shell powders, namely (Al 2 O 3 @AlN) and (SiO 2 @Si 3 N 4 ), and their composites were characterized by means of scanning electron microscopy (SEM) Nova NanoSEM 200, which was used for detailed observation of the surface microstructures of fillers and obtained composites.…”

Section: Measurement Methodsmentioning

confidence: 99%

“…The understanding of the thermal properties of thermally conducting composites has been the subject of numerous theoretical and experimental studies [4,[7][8][9][10][11]. A huge potential was emphasized in relation to composites filled with high thermally conductive materials as they can improve significantly the effective thermal conductivity of whole system.…”

Section: Introductionmentioning

confidence: 99%

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Functional composites with core–shell fillers: I. Particle synthesis and thermal conductivity measurements

Rybak

Gąska

2015

J Mater Sci

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Filled epoxy composites are broadly used in electronic and power devices as an electrical insulation. It is of importance to achieve efficient heat dissipation in such devices due to fact that thermal properties have a strong influence on their proper operation. For this reason, the modification of standard filler materials, such as silica or alumina, can give a promising solution. In this work, a novel core-shell material has been proposed and manufactured by means of a carbothermal reduction and nitridation process. The obtained fillers are made of a standard material which is covered by the high thermally conductive shell. The synthesized fillers were characterized by means of X-ray diffraction, and scanning electron microscopy coupled with elemental analysis. The composite samples based on epoxy resin filled with the manufactured coreshell fillers have been investigated in order to determine their effective thermal conductivity. The obtained composite samples exhibited a significant improvement in the thermal conductivity, represented by a 63 % relative increase. The obtained results show the potential for the novel core-shell fillers to be applied for the electrical insulation with the enhanced thermal conductivity.

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Section: Measurement Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functional composites with core–shell fillers: I. Particle synthesis and thermal conductivity measurements

Rybak

Gąska

2015

J Mater Sci

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“…It is shown that such a procedure leads to the ordering of filler particles along the local direction of the magnetic field. In result, thermal conductivity can be improved by more than 100 % compared to the composite with randomly oriented filler grains obtained without the assistance of magnetic field [6,7].…”

Section: Introductionmentioning

confidence: 99%

Influence of magnetic field-aided filler orientation on structure and transport properties of ferrite filled composites

Goc

Gąska

Klimczyk

et al. 2016

Journal of Magnetism and Magnetic Materials

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“…Thermal conductivity can also be improved through the addition of greater amounts of the filler into composites based on epoxy resin [6,7]. With higher packing and proper arrangement of filler particles, there is a higher possibility that heat transfer paths may be created in the composite [15], resulting in better heat dissipation. However, it must be remembered that the thermal conductivity of composites based on epoxy resin filled with non-metallic particles, is realized by phonon conduction.…”

Section: Introductionmentioning

confidence: 99%

An Investigation into the Influence of Filler Silanization Conditions on Mechanical and Thermal Parameters of Epoxy Resin-Fly Ash Composites

et al. 2016

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The insulation material of electronic devices should offers high thermal conductivity whilst retaining suitable mechanical properties. Epoxy resin is an example of a material that is commonly used by industry for electronic insulation, despite the fact that neither the thermal conductivity nor the mechanical properties are particularly satisfying. These properties can be enhanced by incorporating filler, with silica flour representing the most popular filler. An economically appealing solution is to replace silica flour with fly ash as filler material, however it must be remembered that compatibility of fly ash and epoxy resin is not ideal. In order to improve the coupling between these two materials, fly ash particles covered with [3-(2-Aminoethylamino)propyl]trimethoxysilane were obtained with six different conditions of the silanization process, where the amount of silane, the temperature and the time of the reaction were changed. The presence of the silane layer was confirmed via Fourier Transform Infrared Spectroscopy, Thermogravimetric Analysis and Scanning Electron Microscopy. The mechanical properties, including tensile strength, Young Modulus and fracture toughness, as well as the thermal conductivity of the final samples were investigated. In the case of composites with silanized fillers, all of the mechanical properties were improved, and an enhancement of thermal conductivity was observed for several composites. Moreover, the differences in coupling between the silanized fly ash and the untreated fly ash, and the epoxy matrix were precisely recorded by means of SEM. The presented studies confirm that an effective silanization process can significantly improve the properties of composites, while also verifying the usefulness of waste material. The results highlight that fly ash may be utilized to create a more economically affordable insulation material.

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Magnetic-aligned, magnetite-filled epoxy composites with enhanced thermal conductivity

Cited by 38 publications

References 28 publications

Functional composites with core–shell fillers: I. Particle synthesis and thermal conductivity measurements

Functional composites with core–shell fillers: I. Particle synthesis and thermal conductivity measurements

Influence of magnetic field-aided filler orientation on structure and transport properties of ferrite filled composites

An Investigation into the Influence of Filler Silanization Conditions on Mechanical and Thermal Parameters of Epoxy Resin-Fly Ash Composites

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