关键词: FeCrAl基体, 粘结料, 陶瓷涂层, 高温抗氧化, 抗热震性

Abstract: The effect of cementing materialsˊperformance on the properties of high-temperature oxidation-resistance ceramic coatings has been studied in detail through the analysis of oxidation-resistance and thermal shock-resistance of the coatings. These coatings were fused at 1300℃ in air, and applied to FeCrAl-matrix. The high-temperature cementing materials with good performance were optimized. Experimental result shows that Sample C owns the best performance among five cementing materials because of appropriate initial melting temperature, wider melting temperature range and higher thermal expansion coefficient. Meanwhile these performances of cementing materials are very important to the preparation of a good oxidation-resistance ceramic coatings. For the coating with Cr2O3, which was prepared by Sample C and Cr2O3, its high-temperature oxidation-resistance is about 62 times against FeCrAl-matrix at 1200℃ for 30 h in air; while that of the coating with MgO is about 16 times against FeCrAl-matrix accordingly. The properties of cementing materials were characterized, and the relationship between properties and structures of the coatings was investigated by means of thermal state microscope and high-temperature dilatometer, etc.

Key words: FeCrAl-matrix, ceramic coatings, high-temperature cementing materials, high-temperature oxidation- resistance, thermal shock-resistance