The mechanical properties and microstructure of SiC–AlN particulate composite

Pan, Yubai; Qiu, Jian-Hui; Morita, Mikio; Tan, Shuang‐Jie; Jiang, Daqing

doi:10.1023/a:1004381827254

Cited by 31 publications

(8 citation statements)

References 2 publications

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“…However, ASC20, ASC30, and ASC50 specimens are a mixture of intergranular and transgranular fractures; images (c), (d) and (e) show tiny and flake grain existing in ceramics which can be ascribed to SiC and the number of flaky grains gradually increases. This result suggests that the formation of AlN–SiC solid solutions freeze the microstructure as the solid solutions primarily took place at the outer rim of the AlN grains, which penetrates into the centre of it [30]. Figure 4 shows the elemental distribution of the polished and hot-etched surfaces of the ASC50 sample.…”

Section: Resultsmentioning

confidence: 99%

Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

Wang

Liu

et al. 2019

Advances in Applied Ceramics

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Highly dense AlN-SiC composites with various SiC additions (0-50 wt-%) were fabricated at 1800°C by plasma activated sintering. The effect of SiC addition on structural, thermal and dielectric properties as well as microwave absorbing performance of the composites was investigated. The thermal conductivity decreases with increasing SiC addition, from 68.7 W (m K) −1 for 0 wt-% SiC to 19.38 W (m K) −1 for 50 wt-% SiC. On the contrary, the permittivity and dielectric loss increase gradually, from 7.6-8.5 to 22-26.7 and from 0.02-0.1 to 0.2-0.53, respectively. AlN-SiC composite with better thermal and dielectric properties in 30 wt-% SiC, whose thermal conductivity and dielectric loss are found to be 24.88 W (m K) −1 and 0.15-0.74, respectively. Furthermore, the composite exhibits microwave absorbing performance with the minimum reflection loss (RL) of −16.5 dB at 15.5 GHz and the frequency range of 2.6 GHz for RL below −10 dB (90% absorption).

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Section: Resultsmentioning

confidence: 99%

Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

Wang

Liu

et al. 2019

Advances in Applied Ceramics

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“…Subsequently, Al deposits at the surface of SiC particles and reacts with N 2 to form a thin layer of AlN [reaction ]. This thin layer of AlN restricts the growth of SiC particles, leading to the formation of fine AlN–SiCss grains . Finally, various polytypes morphology of AlN–SiCss transform into a final uniform AlN–SiCss by the diffusion‐controlled transformation through a layer‐displacement mechanism …”

Section: Resultsmentioning

confidence: 99%

Two‐Step Carbothermal Synthesis of AlN–SiC Solid Solution Powder Using Combustion Synthesized Precursor

et al. 2014

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In the present work, a two-step carbothermal reduction method is employed to prepare the AlN-SiC solid solution (AlN-SiCss) powders by using a combustion synthesized precursor. The precursor is prepared by low-temperature combustion synthesis (LCS) method using a mixed solution of aluminum nitrate, silicic acid, polyacrylamide, glucose, and urea. The synthesized LCS precursor exhibits a porous and foamy uniform mixture of Al 2 O 3 + SiO 2 + C consisting of flaky particles. The carbothermal reduction in the LCS precursor is carried out in two steps. First, the precursors are calcined at 1600°C in argon for 3 h. Subsequently, the precursors are further calcined at 1600°C-1900°C in nitrogen for 3 h. The results indicate that the precursor calcined at and above 1850°C in nitrogen for 3 h yields the single-phase AlN-SiCss powders. The synthesized AlN-SiCss powder exhibits nearspherical particles with diameter of 200-500 nm. The experimental and thermodynamical results reveal that the formation of AlN-SiCss occurs via the diffusion of AlN into SiC by virtue of formation of a highly defective b 0 intermediate during the second step reaction.

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“…Subsequently, Zangvil and Ruh 6 presented a tentative AlN–SiC phase diagram. AlN–SiC solid solutions have potential applications as not only structural materials 7–10 but also new functional materials 11–15 . However, it is difficult to fabricate dense 2H AlN–SiC solid solutions due to the high covalence and low diffusion coefficients of AlN and SiC.…”

Section: Introductionmentioning

confidence: 99%

Use of Post‐heat Treatment to Obtain a 2H Solid Solution in Spark Plasma Sintering‐Processed AlN–SiC Mixtures

Kobayashi

Tatami

Wakihara

et al. 2008

Journal of the American Ceramic Society

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Dense aluminum nitride-silicon carbide (AlN-SiC) solid solutions with a 2H structure were fabricated by the post-heat treatment of dense AlN-SiC composites fabricated by spark plasma sintering (SPS). The changes in the relative density, microstructure, and phases present were investigated for the compositions of 25 mol% AlN-75 mol% SiC (AlN 25), 50 mol% AlN-50 mol% SiC (AlN 50), and 75 mol% AlN-25 mol% SiC (AlN 75). The AlN-SiC composites fabricated by the SPS were dense ceramics with fine microstructures and composed of 2H and 6H AlN-SiC solid solutions. The AlN 50 samples heat treated at 22001C and the AlN 75 samples heat treated at 21001C were also dense ceramics and composed of only the 2H AlN-SiC solid solution. In contrast, the AlN 25 samples heat treated at 22001C were porous ceramics and composed of several AlN-SiC solid solutions (2H, 4H, 6H, and 15R), and the AlN 75 samples heat treated at 22001C were decomposed into an Al melt. Dense AlN-SiC solid solutions composed of only the 2H phase can be obtained by controlling the heat-treatment temperatures, except for the AlN 25 sample.T. Parthasarathy-contributing editor

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The mechanical properties and microstructure of SiC–AlN particulate composite

Cited by 31 publications

References 2 publications

Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

Structural, thermal and dielectric properties of AlN–SiC composites fabricated by plasma activated sintering

Two‐Step Carbothermal Synthesis of AlN–SiC Solid Solution Powder Using Combustion Synthesized Precursor

Use of Post‐heat Treatment to Obtain a 2H Solid Solution in Spark Plasma Sintering‐Processed AlN–SiC Mixtures

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