Evaluation of properties and thermal stress field for thermal barrier coatings

来源期刊：中南大学学报(英文版)2008年第z2期

论文作者：王良 齐红宁 杨晓光 李旭

文章页码：367 - 371

Key words：thermal barrier coatings； thermal conductivity； elastic modulus； temperature field； stress field

Abstract: In order to get thermal stress field of the hot section with thermal barrier coating (TBCs), the thermal conductivity and elastic modulus of top-coat are the physical key properties. The porosity of top-coat was tested and evaluated under different high temperatures. The relationship between the microstructure (porosity of top-coat) and properties of TBCs were analyzed to predict the thermal properties of ceramic top-coat, such as thermal conductivity and elastic modulus. The temperature and stress field of the vane with TBCs were simulated using two sets of thermal conductivity data and elastic modulus, which are from literatures and this work, respectively. The results show that the temperature and stress distributions change with thermal conductivity and elastic modulus. The differences of maximum temperatures and stress are 6.5% and 8.0%, respectively.