Novel Deposition of Columnar Y 3 Al 5 O 12 Coatings by Electrostatic Spray‐Assisted Vapor Deposition

A novel and cost‐effective electrostatic spray‐assisted vapor deposition (ESAVD) was used to deposit Y 3 Al 5 O 12 (YAG) coatings. Polycrystalline single‐phase Y 3 Al 5 O 12 coatings were synthesized using the ESAVD method in an open atmosphere at 650°C, and then annealed at 700°–900°C for 1 h. The ESAVD process involves the decomposition and chemical reactions of charged aerosol in vapor phase. The low‐temperature coating deposition characteristics of the ESAVD process using a suitable sol precursor decreases the reaction and crystallization temperatures for forming Y 3 Al 5 O 12 coatings. The microstructure of the Y 3 Al 5 O 12 coating prepared using the ESAVD method is columnar and such strain‐resistance microstructure could be useful for thermal barrier coating applications.