Thermal properties of AlN polycrystals obtained by pulse plasma sintering method

Rutkowski, Paweł; Kata, Dariusz

doi:10.1007/s40145-013-0059-8

Cited by 15 publications

(7 citation statements)

References 10 publications

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“…The diffraction peaks of -SiC and graphite phases in the composite can be detected. Besides, AlYO 3 phase is also found, which was probably derived from the eutectic reaction of Al 2 O 3 and Y 2 O 3 to facilitate the sintering process [34,35]. Significant differences are shown in two principle directions of the composite.…”

Section: Phase Composition and Microstructurementioning

confidence: 97%

Continuous SiC skeleton reinforced highly oriented graphite flake composites with high strength and specific thermal conductivity

et al. 2022

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Highly oriented graphite-based composites have attracted great attention because of their high thermal conductivity (TC), but the low mechanical properties caused by the inhomogeneous distribution and discontinuity of reinforcements restrict the wide applications. Herein, continuous SiC ceramic skeleton reinforced highly oriented graphite flake (SiC/GF) composites were successfully prepared by combining vacuum filtration and spark plasma sintering. The effect of SiC concentration on the microstructure, flexural strength, and thermophysical properties of the composites was investigated. The GF grains in the composites exhibited high orientation with a Lotgering factor of > 88% when the SiC concentration was ⩽ 30 wt%, and the SiC skeleton became continuous with the SiC concentration reaching 20 wt%. The formation of continuous SiC skeleton improved the flexural strength of the composites effectively while keeping the TC in a high level. Especially, the composites with 30 wt% SiC exhibited the flexural strength up to 105 MPa, and the specific TC reaching 0.118 W·m2·K−1·kg·1. The composites with excellent flexural strength and thermophysical properties showed significant promise for thermal management applications.

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Section: Phase Composition and Microstructurementioning

confidence: 97%

Continuous SiC skeleton reinforced highly oriented graphite flake composites with high strength and specific thermal conductivity

et al. 2022

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“…Beryllium oxide ceramics with high thermal conductivity (250 W•m −1 •K −1 ) and good shock resistance, also occupy a priority status in the heat dissipation substrate. Although high purity beryllium oxide ceramics are very safe, the powders of beryllium oxide are highly toxic, which hampers their further development [3,4]. It is of great significance to develop the ceramic substrate material with excellent comprehensive performance.…”

Section: Introduction mentioning

confidence: 99%

Improvement in mechanical properties in AlN-h-BN composites with high thermal conductivity

et al. 2021

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It is possible to improve the machinability of aluminum nitride-hexagonal boron nitride (AlN-h-BN) ceramics while maintaining high strength and high thermal conductivity. The composite ceramics with 0–30 wt% BN as secondary phase were prepared by hot pressed sintering, using yttrium oxide (Y2O3) as sintering aid. The phase composition, density, microstructure, mechanical properties, thermal conductivity, and dielectric properties were investigated. The sintering additives were favorable to purify the grain boundaries and improve densification, reacting with oxide impurities on the surface of raw material powder particles. The optimum BN content improved the flexural strength and fracture toughness of composite ceramics with 475 MPa and 4.86 MPa·m1/2, respectively. With increasing the amount of BN, the thermal conductivity and hardness of composites gradually decreased, but the minimum value of thermal conductivity was still 85.6 W·m−1·K−1. The relative dielectric constant and dielectric loss tangent of the samples ranged from 6.8 to 8.3 and from 2.4 × 10−3 to 6.4 × 10−3, respectively, in 22–26 GHz.

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“…AlN, as an important III-V semiconductor material, has attracted great attention because of its high thermal conductivity, high electrical resistance, wide band gap, low dielectric constant, and low thermal expansion coefficient [1,2]. Based on these excellent properties, it has good application prospects in terms of electronic substrates, packaging materials, heat sinks and field-emission devices [3][4][5][6]. Recently, spherical AlN particles with micrometer size have shown significant promise for applications in raw materials for electronic substrates and fillers for packaging materials owing to their good fluidity and dispersity [7,8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

Wei

et al. 2020

Preprint

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Spherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature and long soaking time, which lead to the high cost and limit the wide application of the products. Herein, nearly spherical AlN particles with the average size of 2.5 μm were successfully synthesized via an in-situ combustion synthesis method. The effect of N 2 pressure, NH 4 Cl content and Al particle size on the combustion reaction procedure, phase composition and microstructure of the products was systematically investigated. The results showed that the decreased N 2 pressure, increased NH 4 Cl content and Al particle size led to the decreasing of combustion temperature and speed, which further affected the morphology of the products. As a result, low N 2 pressure (0.2 MPa), a small amount of NH 4 Cl (0.5 wt%) and fine Al particles (~2.5 μm) contributed to a moderate combustion temperature and facilitated the formation of nearly spherical AlN particles. In addition, based on the gas-releasing assisted quenching experiments and thermo-kinetic analysis, a two-step growth mechanism for the nearly spherical AlN particles was rationally proposed. The present method shows the advantages of low cost and high efficiency for preparing nearly spherical AlN particles, which can be used as raw materials for electronic substrates and fillers for packaging materials.

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Thermal properties of AlN polycrystals obtained by pulse plasma sintering method

Cited by 15 publications

References 10 publications

Continuous SiC skeleton reinforced highly oriented graphite flake composites with high strength and specific thermal conductivity

Continuous SiC skeleton reinforced highly oriented graphite flake composites with high strength and specific thermal conductivity

Improvement in mechanical properties in AlN-h-BN composites with high thermal conductivity

Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

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