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- W2904652202 abstract "Abstract Porous Si3N4-bonded SiC ceramics with high porosity were prepared by the reaction-sintering method. In this process, Si3N4 was synthesized by the nitridation of silicon powder. The X-ray diffraction (XRD) indicated that the main phases of the porous Si3N4-bonded SiC ceramics were SiC, α-Si3N4, and β-Si3N4, respectively. The contents of β-Si3N4 were increased following the sintering temperature. The morphology of Si3N4 whiskers was investigated by scanning electron microscope (SEM), which was shown that the needle-like (low sintering-temperature) and rod-like (higher sintering-temperature) whiskers were formed, respectively. From low to high synthesized temperature, the highest porosity of the porous Si3N4 bonded SiC ceramic was up to 46.7%, and the bending strength was ~11.6 MPa. The α-Si3N4 whiskers were derived from the reaction between N2 and Si powders, the growth mechanism was proved by Vapor–Solid (VS). Meanwhile, the growth mechanism of β-Si3N4 was in accordance with Vapor–Solid–Liquid (VSL) growth mechanism. With the increase of sintering temperature, Si powders were melted to liquid silicon and the α-Si3N4 was dissolved into the liquid then the β-Si3N4 was precipitated successfully." @default.
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- W2904652202 date "2019-04-01" @default.
- W2904652202 modified "2023-09-23" @default.
- W2904652202 title "Preparation and characterization of porous Si3N4-bonded SiC ceramics and morphology change mechanism of Si3N4 whiskers" @default.
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- W2904652202 doi "https://doi.org/10.1016/j.ceramint.2018.12.060" @default.
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