Evaluation of Thermal Shock Damage in Ceramic Disks Heated under Constant Heat Flux Conditions
Evaluation of Thermal Shock Damage in Ceramic Disks Heated under Constant Heat Flux Conditions
复制标题
恒定热通量条件下加热陶瓷盘的热冲击损伤评估
DOI：
10.2109/jcersj.103.494
复制
发表时间：
1995
影响因子：
1.1
通讯作者：
M. Takatsu
中科院分区：
文献类型：
--
作者：
Y. Mizutani;T. Nishikawa;Takamitsu Fukui;M. Takatsu
在恒定热流条件下，从外部加热的陶瓷圆盘的热冲击损伤进行了评估，从破碎的试样。测量了圆盘试样径向温度分布，计算了热断裂应力和热断裂能。断裂工作的标本估计从断裂表面的总面积，和弹性应变能计算从n次方函数拟合的测量温度分布在断裂。两种类型的陶瓷用于实验;氧化铝陶瓷具有较高的强度、弹性和热导率，云母陶瓷具有较低的强度、弹性和热导率。热断裂试样的断裂功与弹性应变能有一定的相关性，约占总弹性应变能的三分之一。此外，根据陶瓷的抗热震损伤性能，断裂能随温度分布而变化。因此，采用加热圆盘试样进行热震试验是评价陶瓷抗热震损伤性能的有效方法。
Thermal shock damage in ceramic disks heated from outside under constant heat flux conditions was evaluated from fragmentation of fractured specimens. Temperature disturibution in disk specimens in radial direction were measured to evaluate the thermal fracture stress and thermal fracture energy. Work-of-fracture of the specimen was estimated from the total area of the fractured surface, and the elastic strain energy was calculated from the nth-power functional fitting of measured temperature distributions at fracture. Two types of ceramics were used for the experiments; alumina ceramic having higher strength, elasticity and thermal couductivity, and mica ceramics having lower strength, elasticity and thermal conductivity. Work-of-fracture in thermal fractured specimens had a mutual relation with elastic strain energy, and corresponded to approximately one third of the total elastic strain energy. Furthermore, according to the thermal shock damage resistance of ceramics, the fracture energy varied with temperature distribition. Therefore, thermal shock test by heating disk specimens is effective to evaluate the thermal shock damage resistance of ceramics.