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首页> 外文期刊>Journal of Materials Engineering and Performance >The Influence of TiO2 Addition on the Modulus of Rupture of Alumina-Magnesia Refractory Castables
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The Influence of TiO2 Addition on the Modulus of Rupture of Alumina-Magnesia Refractory Castables

机译：TiO2添加量对氧化铝-镁质耐火浇注料断裂模量的影响

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摘要

The addition of TiO2 to alumina-magnesia refractory castables could accelerate the in situ spinel and calcium hexa-aluminate (CA(6)) formation and change the phase evolution, which will have direct effect on the overall modulus of rupture values. The cold (CMOR) and hot (HMOR) modulus of rupture, thermal expansion, and elastic modulus of alumina-magnesia refractory castables with different amounts of TiO2 were measured. The correlation of CMOR, theoretical strength, fracture toughness, and the fractal dimension of the fracture surface for these compositions were investigated. HMOR data were described using the model based on Varshni approach and Adam-Gibbs theory. The influence of TiO2 addition on the modulus of rupture of alumina-magnesia refractory castables was related to microcracks derived from expansive phase formation and pore filling or viscous bridging due to the presence of liquid phase at high temperature. The contribution of the above factors to the modulus of rupture for castables varied with the temperature.
机译：在氧化铝-镁质耐火浇注料中添加TiO2可以促进原位尖晶石和六铝酸钙（CA（6））的形成并改变相的演变，这将对整体断裂模量值产生直接影响。测量了不同TiO2含量的氧化铝-镁质耐火浇注料的冷（CMOR）和热（HMOR）断裂模量，热膨胀率和弹性模量。研究了这些组合物的CMOR，理论强度，断裂韧性和断裂表面的分形维数的相关性。使用基于Varshni方法和Adam-Gibbs理论的模型描述了HMOR数据。 TiO 2的添加对氧化铝-镁质耐火浇注料的断裂模量的影响与由于高温存在液相导致的膨胀相形成和孔填充或粘性桥接引起的微裂纹有关。上述因素对浇铸料的断裂模量的贡献随温度而变化。

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