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The Effect of SiC Content on Microstructure and Microwave Heating Rate of h-BN/SiC Ceramics Fabricated by Spark Plasma Sintering

1
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
2
Beijing Key Laboratory of Metal Material Characterization, Beijing 100081, China
3
The NCS Testing Technology Co., Ltd., Beijing 100081, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(12), 1909; https://doi.org/10.3390/ma12121909
Received: 24 May 2019 / Revised: 7 June 2019 / Accepted: 11 June 2019 / Published: 13 June 2019
Hexagonal boron nitride/silicon carbide (h-BN/SiC) ceramics were fabricated by a spark plasma sintering (SPS) method. Phase and microstructure of ceramics were characterized and observed, respectively, using the X-ray diffraction, scanning electron microscope and electron probe microanalysis. The effect of molar ratios of SiC to h-BN on the microstructure, relative density, hardness, thermal conductivity, and the heating rate by microwaves on the ceramics were investigated. The results showed that the orientation of flake-like h-BN was significantly influenced by SiC content in h-BN/SiC ceramics. With the increasing of SiC content, the h-BN flakes gradually became an isotropic distribution from the preferred orientation aligning in a SPS pressure direction. The relative density of h-BN/SiC ceramics was 97.6 ± 0.9% at a molar ratio of SiC to h-BN of 40/60 mol%. The preferential orientation of h-BN flakes contributed to a relatively high thermal conductivity along the SPS pressure direction, which was beneficial to increasing the heating rate of h-BN/SiC ceramics in microwave fields. View Full-Text
Keywords: hexagonal boron nitride (h-BN); silicon carbide (SiC); spark plasma sintering (SPS); microwave heating hexagonal boron nitride (h-BN); silicon carbide (SiC); spark plasma sintering (SPS); microwave heating
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MDPI and ACS Style

Lun, H.; Zeng, Y.; Xiong, X.; Zhao, L.; Li, D.; Ye, Z.; Qian, T. The Effect of SiC Content on Microstructure and Microwave Heating Rate of h-BN/SiC Ceramics Fabricated by Spark Plasma Sintering. Materials 2019, 12, 1909.

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