The effect of Carbon on Si to SiC ratio in Si-SiC composite from natural sand
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초록
Silicon-Silicon Carbide (Si-SiC) composite particles were synthesized by self-propagating high temperature synthesis (SHS)from a powder mixture of natural sand with activated carbon and magnesium (SiO2-C-Mg). The Si-SiC ratio in Si-SiCcomposites was manipulated via the carbon mole ratio in the precursor mixture were investigated using X-ray diffraction(XRD) and scanning electron microscopy (SEM). The results show that the carbon molar ratio in the precursor mixturesignificantly affects the Si to SiC ratio in Si-SiC composite. The intensity of SiC were increased with an increase carbon moleratio; the intensity of Si were gradually decreased and disappeared with a sufficient carbon amount consuming all of it. Thesynthesized product powders were leached in three steps with HCl: CH3COOH (1:1 v/v), 2M HCl and HF: H2O (1:1 v/v)solutions, respectively. The morphology showed SiC whisker. SiC whiskers have been one of the more popular reinforcingmaterials for both metal matrix composites and ceramic matrix composites, which can make these Si-SiC composites suitablefor use as reinforcing fillers.
Abstract
Silicon-Silicon Carbide (Si-SiC) composite particles were synthesized by self-propagating high temperature synthesis (SHS)from a powder mixture of natural sand with activated carbon and magnesium (SiO2-C-Mg). The Si-SiC ratio in Si-SiCcomposites was manipulated via the carbon mole ratio in the precursor mixture were investigated using X-ray diffraction(XRD) and scanning electron microscopy (SEM). The results show that the carbon molar ratio in the precursor mixturesignificantly affects the Si to SiC ratio in Si-SiC composite. The intensity of SiC were increased with an increase carbon moleratio; the intensity of Si were gradually decreased and disappeared with a sufficient carbon amount consuming all of it. Thesynthesized product powders were leached in three steps with HCl: CH3COOH (1:1 v/v), 2M HCl and HF: H2O (1:1 v/v)solutions, respectively. The morphology showed SiC whisker. SiC whiskers have been one of the more popular reinforcingmaterials for both metal matrix composites and ceramic matrix composites, which can make these Si-SiC composites suitablefor use as reinforcing fillers.
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