Based on the analysis of the working condition requirements for jet engine nozzles, this paper offers the manufacturing process technology for making a ceramic thermal barrier coating system by plasma spraying. The coating system consists of three layers: a bondcoat of Ni20Cr to improve the adhesion between the substrate and ceramic topcoats; a second layer of NiCrAlY to reduce the stress caused by the difference in the thermal expansion between the topcoats; two thermal barrier topcoats of ZrO₂-8Y₂O₃. The experimental results show a good adhesion on 41.8 MPa between the substrate and the coating layer. The coating system is resistant to a constant thermal test at 1750^oC and a thermal shock test at 1800^oC-600^oC.

This paper presents a part of the results published in the National Science and Technology Conference on Mechanical - Transportation Engineering in 2016.

Keywords:Thermal barrier coating, plasma thermal spray, jet engine nozzles, ZrO₂-8Y₂O₃