Abstract
• Mullite whiskers on the surface of SiC ceramics prepared by molten salts reactions. • SEM images show mullite whiskers with nanometer diameters and micrometer lengths. • Chemical reaction process was demonstrated by TG–DSC–MS–FTIR coupling analysis. Mullite whiskers coating on the surface of SiC ceramics was fabricated by chemical reactions between the SiC ceramic substrate and molten salts (Al 2 (SO 4 ) 3 + Na 2 SO 4 ), which greatly improved the oxidation resistance of the porous SiC ceramic. Scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, Fourier transform-infrared spectroscopy and high resolution transmission electron microscopy were employed to characterize the structural morphology and phase compositions of the modified porous SiC. The results show that the surface of SiC ceramic was covered by dense mullite whiskers with nanometer-sized (100–300 nm) diameters and micrometer-sized (10–20 μm) lengths. The molten salts chemical reactions were firstly proposed and demonstrated by thermo gravimetric (TG) analyzer coupled with mass spectrometry (MS) and fourier transform infrared spectrometry (FTIR).
Published Version
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