研究目的
Investigating the variations in material structure of N-SiC side lining for reduction pots, focusing on porosity gradients and their implications for corrosion resistance.
研究成果
The processing of N-SiC refractory materials involves a positive volume effect from the silicon-nitrogen reaction, leading to porosity reduction. Exothermal effects cause temperature gradients, resulting in porosity and silicon nitride concentration variations from the surface to the middle of the shapes. The porosity of the green shape influences these gradients in the finished material. These structural variations may impact corrosion resistance, but direct correlations are not clear, necessitating further research on corrosion and oxidation resistance in different parts of the material.
研究不足
The study relies on standard industrial samples and methods, which may not capture all variations in production. Correlations between corrosion resistance and material properties (e.g., porosity, phase ratios) are not fully established, and further investigations are needed. The analysis is limited to existing materials without experimental manipulation of processing parameters.
1：Experimental Design and Method Selection:
The study analyzed standard industrial N-SiC side lining refractories to understand porosity gradients and material composition variations. Standard methods were used for property determination, and chemical composition was analyzed using wet chemistry and XRD.
2：Sample Selection and Data Sources:
Standard industrial N-SiC refractories were used as samples.
3：List of Experimental Equipment and Materials:
Equipment included tools for porosity, density, and strength measurements; wet chemistry setup; XRD equipment; and LECO analyzer for Nitrogen and Oxygen determination. Materials were the N-SiC refractory samples.
4：Experimental Procedures and Operational Workflow:
Samples were analyzed for properties (porosity, density, strength) using standard methods. Chemical composition was determined via wet chemistry (for SiC, Si, SiO2, CaO, Fe2O3, Al2O3) and XRD (for SiC, Si, SiO2, Si3N4, Si2ON2, α-Si3N4, β-Si3N4). Nitrogen and Oxygen were measured using the LECO method.
5：4). Nitrogen and Oxygen were measured using the LECO method. Data Analysis Methods:
5. Data Analysis Methods: Data from different methods were compared for consistency, and porosity gradients and phase ratios were analyzed statistically.
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