Abstract
To improve the dispersion of SiC nanowires in ceramic matrix, SiC/MgAl2O4 composite powders containing SiC nanowires were synthesized by combustion synthesis with Mg, Al, silica fume, carbon black as raw materials, while ferrocene was used as catalyst. The effects of Al/Mg (molar ratio) on the content and aspect ratio of SiC nanowires were studied. The mechanism of combustion reaction was investigated by combustion quenching method, and the growth mechanism of SiC nanowires was discussed. The results showed that the main phases of all specimens are SiC and spinel, and the content and aspect ratio of SiC nanowires increased firstly and then decreased with the increase of Al/Mg. The SiC nanowires showed the highest content (6.1%) and maximum aspect ratio (200) in the product when Al/Mg = 4. SiC and spinel generated in reaction zones, and the generation of SiC nanowires began at high temperature reaction zone. In addition, the growth mechanism of SiC nanowires was verified to be VLS and SLGS mechanism.
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