研究目的
To explore the effect of temperature and additive content on the morphology of synthesized silicon carbide and the impurity removal order on product purity using carbothermal reduction method.
研究成果
The study successfully prepared 3C-SiC powders at low temperatures using carbothermal reduction method. The addition of Nb improved the morphology and crystallinity of SiC. The optimal conditions were found to be at 1500℃ with 1% Nb content. Removing SiO2 first, then C, was effective in purifying the product.
研究不足
The study focuses on the effect of temperature and additive content on SiC morphology and impurity removal order, but does not explore other potential additives or alternative methods for SiC preparation.
1：Experimental Design and Method Selection:
The carbothermal reduction method was used with silica fume as silicon source, glucose as carbon source, and metal niobium as additives.
2：Sample Selection and Data Sources:
Silica fume powder, glucose, and Nb were used with the carbon silicon ratio of 1:
3：List of Experimental Equipment and Materials:
Tubular furnace, ball mill, hydrofluoric acid (HF), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectrometer, Scanning Electron Microscope (SEM).
4：Experimental Procedures and Operational Workflow:
The slurry was prepared by ball-milling, dried, and then heated in a tubular furnace under nitrogen atmosphere to prepare precursor. The precursor was then treated under vacuum for carbothermal reduction.
5：Data Analysis Methods:
XRD for phase composition and crystallinity, FT-IR for chemical bonds, SEM for microstructures.
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