Al2O3抗热震陶瓷的研究进展

为了增进对Al₂O₃抗热震陶瓷发展动态的了解,为Al₂O₃抗热震陶瓷的制备提供设计依据,针对Al₂O₃抗热震陶瓷的常用抗热震性测试方法,Al₂O₃陶瓷微观结构、表面条件、尺寸对抗热震性的影响,利用第二相法提高Al₂O₃陶瓷抗热震性的可行性,以及多孔Al₂O₃抗热震陶瓷的研究进展等方面进行了评述.在Al₂O₃陶瓷中添加ZrO₂、稀土化合物、低热膨胀系数组元或高热导率组元等可以改善Al₂O₃陶瓷的抗弯强度、断裂韧性、弹性模量等力学性能和(或)热膨胀系数、热导率等热学性能,从而起到提高Al₂O₃陶瓷抗热震性能的作用.叠层Al₂O₃复合抗热震陶瓷将成为今后的一个研究方向.

Research progress in Al2O3 thermal shock resistant ceramics

In order to better understand the development trend of Al₂O₃ thermal shock resistant ceramics and to provide design consideration for the preparation of Al₂O₃ thermal shock resistant ceramics, the commonly used thermal shock resistance test methods for the Al₂O₃ thermal shock resistant ceramics, the influence of microstructures, surface conditions and geometric dimensions of Al₂O₃ ceramics on the thermal shock resistance, the feasibility of second phase method to improve the thermal shock resistance of Al₂O₃ ceramics and the research progress on porous Al₂O₃ thermal shock resistant ceramics, were reviewed. Through the addition of ZrO₂, rare earth compounds, low thermal expansion coefficient components or high thermal conductivity components, some mechanical properties of Al₂O₃ ceramics, e. g. bending strength, fracture toughness and elastic modulus, can be enhanced, and as well as(or)the thermal properties of Al₂O₃ ceramics, such as thermal expansion coefficient and thermal conductivity, so as to improve the thermal shock resistance of Al₂O₃ ceramics. Furthermore, laminated Al₂O₃ composite thermal shock resistant ceramics will become a research direction in the future.