Effects of trace amount of nanometric SiC additives with wire or particle shapes on the mechanical and thermal properties of alumina matrix composites

Jiraborvornpongsa, Noppasint; Imai, Masamitsu; Yoshida, Katsumi; Yano, Toyohiko

doi:10.1007/s10853-013-7511-6

Cited by 12 publications

(6 citation statements)

References 19 publications

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“…However, this unavoidably leads to the increase of power dissipation and great heat fluxes within a certain device, which reduces its service lifetime and reliability [1][2][3][4][5][6][7][8]. Although some ceramics possess the properties of high thermal conductivity and good electric insulation, it is hard to process them into satisfactory finished products as the ceramics are hard and brittle [9].…”

Section: Introductionmentioning

confidence: 99%

Sandwiched epoxy–alumina composites with synergistically enhanced thermal conductivity and breakdown strength

Wang

Yang

et al. 2017

J Mater Sci

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Development of polymer-based composites with simultaneously high thermal conductivity and breakdown strength has attracted considerable attentions owing to their important applications in both electronic and electric industries. In this study, we successfully design novel epoxy-based composites with nanoAl 2 O 3 /epoxy composite layer sandwiched between micro-Al 2 O 3 /epoxy composite layers, which show synergistically and significantly enhanced thermal conductivity and breakdown strength. Compared with the traditional composites, the bottleneck that both thermal conductivity and breakdown strength cannot be simultaneously enhanced can be overcome successfully. An optimized sandwiched alumina-epoxy composite with 70 wt% micro-Al 2 O 3 fillers in the outer layers and 3 wt% nano-Al 2 O 3 in the middle layer simultaneously displays a high thermal conductivity of 0.447 W m -1 K -1 (2.4 times of that of epoxy) and a high breakdown strength of 68.50 kV mm -1 , which is 6.3 % higher than that of neat epoxy (64.45 kV mm -1 ). The experimental results on the thermal conductivity of multi-layered alumina-epoxy composites were in well accordance with the theoretical values predicted from the series conduction model. This novel technique simultaneously improves thermal conductivity and breakdown strength, which is of critical importance for design of perspective composites for electronic and electric equipments.

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Section: Introductionmentioning

confidence: 99%

Sandwiched epoxy–alumina composites with synergistically enhanced thermal conductivity and breakdown strength

Wang

Yang

et al. 2017

J Mater Sci

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“…The nano-silicon carbide SiC was prepared via laser pyrolysis [9], starting from two gaseous reagents, silane SiH 4 and acetylene C 2 H 2 . Laser pyrolysis, which is classified as a vapour-phase synthesis of nanoparticles (NPs), permitted highly localized and fast heating (leading to a rapid nucleation) in a volume that could be limited to a few hundred mm 3 , followed by a fast quenching of the particle growth (in a few msec). As a result, the NPs, which had an average size ranging from 5 to 60 nm and narrow size distribution, were formed in the hot region.…”

Section: Syntheses Of the Nanocrystalsmentioning

confidence: 99%

“…In the last decade, building refractories have emerged as an important industrial sector [1]. In particular, this development concerns the improvement of thermo-physical properties through the identification of ad hoc formulations [2][3][4][5]. Indeed, on the market, new products compete against each other for the parameters that characterize the performances of refractories.…”

Section: Introductionmentioning

confidence: 99%

Properties of Nanocrystals-Formulated Aluminosilicate Bricks

Conciauro

Filippo

Carlucci

et al. 2015

Nanomaterials and Nanotechnology

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In the present work, seven different types of nanocrystals were studied as additives in the formulation of aluminosilicate bricks. The considered nanocrystals consisted of anatase titanium dioxide (two differently shaped types), boron modified anatase, calcium carbonate (in calcite phase), aluminium hydroxide and silicon carbide (of two diverse sizes), which were prepared using different methods. Syntheses aim to give a good control over a particle's size and shape. Anatase titania nanocrystals, together with the nano-aluminium hydroxide ones, were synthesized via microwave-assisted procedures, with the use of different additives and without the final calcination steps. The silicon carbide nanoparticles were prepared via laser pyrolysis. The nano-calcium carbonate was prepared via a spray drying technique. All of the nanocrystals were tested as fillers (in 0.5, 1 and 2 wt. % amounts) in a commercial aluminosilicate refractory (55 % Al2O3, 42 % SiO2). They were used to prepare bricks that were thermally treated at 1300 °C for 24 hours, according to the international norms. The differently synthesized nanocrystals were added for the preparation of the bricks, with the aim to improve their heat-insulating and/or mechanical properties. The nanocrystals-modified refractories showed variations in properties, with respect to the untreated aluminosilicate reference in heat-insulating performances (thermal diffusivities were measured by the “hot disk” technique). In general, they also showed improvements in mechanical compression resistance for all of the samples at 2 wt. %. The best heat insulation was obtained with the addition of nano-aluminium hydroxide at 2 wt. %, while the highest mechanical compression breaking resistance was found with nano-CaCO3 at 2 wt. %. These outcomes were investigated with complementary techniques, like mercury porosimetry for porosity, and Archimedes methods to measure physical properties like the bulk and apparent densities, apparent porosities and water absorption. The results show that the nano-aluminium hydroxide modified bricks were the most porous, which could explain the best heat-insulating performances. There is a less straightforward explanation for the mechanical resistance results, as they may have relations with the characteristics of the pores. Furthermore, the nanoparticles may have possible reactions with the matrix during the heat treatments.

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“…16 In experimental respect, Na et al studied the influence of particle shape on composite magnetostrictive properties. 17 Ahmad et al 18 and Jiraborvornpongsa et al 19 studied the influence of particle shape on the mechanical and thermal properties of composites. Uddin et al studied the influence of particle shape and size on the hardness and electrical properties of composites.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Particle Shapes on Strength and Damage Properties of Metal Matrix Composites

Qing¹

2015

j nanosci nanotechnol

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The influence of the distribution of particle shapes, locations and orientations on the mechanical behavior of the particle reinforced Metal-Matrix Composite (MMC) is studied through finite element (FE) method under different loading conditions in this investigation. The FE-model with multi-particle is generated through the random sequential adsorption algorithm, with the particles treated respectively as elastic-brittle circular, regular octagon and hexagon and square shape. Ductile failure in metal matrix, brittle fracture of particles and interface debonding are taken into account during the simulations. 2D cohesive element is applied to simulate the debonding behavior of interface. The damage models based on the stress triaxial indicator and maximum principal stress criterion are developed to simulate the ductile failure of metal matrix and brittle cracking of particles, respectively. Simulation results show that the interface debonding dominates the failure process under the loading, while the damage in particle grows at slowest rate compared with those in matrix and interface.

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Effects of trace amount of nanometric SiC additives with wire or particle shapes on the mechanical and thermal properties of alumina matrix composites

Cited by 12 publications

References 19 publications

Sandwiched epoxy–alumina composites with synergistically enhanced thermal conductivity and breakdown strength

Sandwiched epoxy–alumina composites with synergistically enhanced thermal conductivity and breakdown strength

Properties of Nanocrystals-Formulated Aluminosilicate Bricks

The Influence of Particle Shapes on Strength and Damage Properties of Metal Matrix Composites

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