Zirconates as New Materials for Thermal Barrier Coatings
作者： Robert Vassen , Xueqiang Cao , Frank Tietz , Debabrata Basu , Detlev Stöver
DOI: 10.1111/J.1151-2916.2000.TB01506.X
关键词:
摘要: Zirconates with high melting points were investigated for application as materials for thermal barrier coatings at operating temperatures >1300°C. SrZrO3, BaZrO3, and La2Zr2O7 powders synthesized sintered to compacts with various levels of porosity. The sintering results indicated a promising low-sintering activity the materials. Thermal properties these dense determined. expansion coefficients slightly lower than those Y2O3-stabilized ZrO2 (YSZ); conductivities SrZrO3 BaZrO3 comparable or higher YSZ. La2Zr2O7 had conductivity. was not suitable application coating because phase transition between 700° 800°C. Mechanical (hardness, fracture toughness, Young’s modulus) samples determined by indentation techniques showed hardness modulus compared powders optimized plasma spraying. Plasma-sprayed produced characterized. cycling gas burner 1200°C massive attack coating, loss BaO. On other hand, excellent stability thermalshock behavior.
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