铁铬铝基高温抗氧化陶瓷涂层粘结料优化

Optimization of Cementing Materials Used in High-temperature Oxidation-resistance Ceramic Coatings for FeCrAl-matrix

从高温涂层的抗氧化性、热震性研究入手,详细探讨了粘结料的始熔温度、熔融温度范围以及热膨胀系数对敞开体系1300oC下熔烧制备FeCrAl基高温(1200oC)抗氧化陶瓷涂层性能的影响,优化出具有良好性能的高温(1200oC)粘结料.研究结果表明,具有合适的始熔温度、熔融温度范围和较高热膨胀系数的高温粘结料是制备性能优良的陶瓷涂层的基础.实验中采用了热态显微镜、高温热膨胀仪等测试手段对粘结料性能进行了表征,揭示了涂层性能与结构之间的关系.

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 1300oC 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 1200oC 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.