Porous α-Al2O3 thermal barrier coatings with dispersed Pt particles prepared by cathode plasma electrolytic deposition

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2016, Vol.23 (1), p.92-101
• Main Authors: Wang, Peng, He, Ye-dong, Deng, Shun-jie, Zhang, Jin
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Cathodes; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coatings; Composites; Corrosion and Coatings; Diffusion rate; Electrodeposition; Glass; High temperature; Materials Science; Mechanical properties; Metallic Materials; Natural Materials; Oxidation; Oxidation resistance; Spallation; Stress relaxation; Substrate inhibition; Surfaces and Interfaces; Thermal barrier coatings; Thermal insulation; Thermal resistance; Thin Films; Tribology; 分散; 制备; 多孔性; 氧化铝; 电解沉积法; 等离子体; 粒子; 陶瓷热障涂层
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-016-1215-2

Porous α-Al2O3 thermal barrier coatings （TBCs） containing dispersed Pt particles were prepared by cathode plasma electrolytic deposition （CPED）. The influence of the Pt particles on the microstructure of the coatings and the CPED process were studied. The prepared coatings were mainly composed of α-Al2O3. The average thickness of the coatings was approximately 100 μm. Such single-layer TBCs ex- hibited not only excellent high-temperature cyclic oxidation and spallation resistance, but also good thermal insulation properties. Porous α-Al2O3 TBCs inhibit further oxidation of alloy substrates because of their extremely low oxygen diffusion rate, provide good thermal insu- lation because of their porous structure, and exhibit excellent mechanical properties because of the toughening effect of the Pt particles and because of stress relaxation induced by deformation of the porous structure.