【摘要】 在不同热震温差下，研究了高铝纤维对铝硅质耐火材料的强度和裂纹形成及扩展的影响。利用海氏理论和（Ｇｒｉｆｆｉｔｈ断裂力学理论，推导出临界热震温差与裂纹扩展之间的解析式．研究认为：引入数量和长径比适宜的纤维，可在基体内形成大量微裂纹，而微裂纹增韧则是纤维增强耐火材料抗热震的主要机理之一更多还原

【Abstract】 Effect of alumina fiber on strength and crack forming and extending of Al2O3-SiO2 refractories after thermal shocked at different thermal shock temperature difference (△T) was researched. The relationship equation between critical thermal shock temperature difference (△Tc) and crack extending was deduced according to the Haise and Griffith fracture theory. The results show that adding proper amount fiber with suitable length/diameter ratio can form a lot of microcracks in the materials and, microcrack toughening is one of the main mechanisms that the thermal shock resistance of fiber -reinforced refractories is improved.更多还原