Abstract Gaseous products released during the oxidation of SiC at 1700 °C lead to serious degradation of SiC castables. Ti combined with Si and carbon black are added to improve the mechanical behavior and oxidation resistance of SiC castables in this study. The mechanical behavior, isothermal oxidation, microstructure, and thermodynamic analysis are used to evaluate the properties of SiC castables. The result shows that SiC castables with more Ti exhibit better degradation resistance at high temperature oxidation atmosphere. The preferential oxidation of metal Ti to TiO2 reduces the oxidizing gases and increases the content of SiO (g) in the matrix, which is beneficial for the generation of SiC fibers; in turn, this reinforces the mechanical behavior. In addition, a certain amount of TiO2 dissolves into SiO2 glass following the decrease in viscosity. TiO2 is not only more difficult to volatilize than SiO2, but also can decrease the viscosity of SiO2 glass to improve the mobility of the liquid, which is good for healing the pores on the surface and protecting the inner SiC from being oxidized; this improves the mechanical properties and oxidation resistance.

中文翻译：

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Ti与Si、C结合对等离子气化炉用SiC浇注料力学性能和抗氧化性能的影响

摘要 SiC 在 1700 °C 氧化过程中释放出的气体产物会导致 SiC 浇注料严重降解。在本研究中，添加 Ti、Si 和炭黑以改善 SiC 浇注料的力学性能和抗氧化性。使用力学行为、等温氧化、微观结构和热力学分析来评估 SiC 浇注料的性能。结果表明，含Ti较多的SiC浇注料在高温氧化气氛下表现出更好的抗降解性。金属Ti优先氧化成TiO2，减少了氧化气体，增加了基体中SiO(g)的含量，有利于SiC纤维的生成；反过来，这加强了机械行为。此外，随着粘度的降低，一定量的 TiO2 溶解到 SiO2 玻璃中。TiO2不仅比SiO2更难挥发，而且可以降低SiO2玻璃的粘度，提高液体的流动性，有利于愈合表面的气孔，保护内部的SiC不被氧化；这提高了机械性能和抗氧化性。