Formation of thermal barrier coatings using Zr-Y salt pyrolysis in Ar-He-H2 plasma

About the authors:

Riat R. Faizullin, Postgraduate Student, Department of Mechanics of Multiphase Systems, Tyumen State University
Aleksandr B. Shabarov, Dr. Sci. (Tech.), Professor, Honored Scientist of the Russian Federation, Professor of the Department of Applied and Technical Physics, Institute of Physics and Technology, University of Tyumen; a.b.shabarov@utmn.ru; eLibrary AuthorID, ORCID, ResearcherID, ScopusID

Abstract:

An experimental set-up has been designed and manufactured. Samples with heat protective ceramic coating have been obtained at the set-up by injecting in Ar-He-H2 plasma ZrO2-Y2O3 precursor. Spray coating modes have been established. The results of thermal-cycle testing in 1000С-11500С(15 min)-1000С cycle mode showed the advantage of the obtained coatings over the traditional plasma one by 40%. The authors assume that ZrO2-Y2O3 precursor alloying with rare earth metal oxides will increase the operating temperature of the coating. The injection of ZrO2 — 7%Y2O3 precursor in plasma was performed with air atomizing burner. During spray coating, the surface temperature of the samples did not exceed 700-7500С. The characteristic surface texture of the thermal barrier coating is shown in Fig.4. The study of the coating microstructure by means of JEOL JSM6510LV electron microscope showed existence of ZrO2+7%Y2O spherical particles, particles with full and partial penetration, fusion and cross-sectional microcracks. Prior to TBC formation the samples were covered with PKH-27YU7SZI (ПКХ-27Ю7С3И) 170 µm metal heat-proof layer using a traditional plasma method. Thermal-diffusion vacuum annealing at a temperature of 10500С was executed during 4 hours.

References:

1. Mubojadzhan, S.A. Protection Coating for Hot-gas-path HGP. «Vse materialy. Jenciklopedicheskij spravochnik» — «All materials. Encyclopedic reference book», 2011. № 4. 17 p. (in Russian).

2. Mubojadzhan, S.A., Egorova, L.P., Gorlova, D.S., Kos'min, A.A. Thermal Protection Coating for HGP Large Machine Parts of Advanced Turbine Jets. Aviacionnye materialy i tehnologii — Aircraft materials and technologies, 2005. № 4. 8 p. (in Russian).

3. Tamarin, Ju.A., Kachanov, E.B. Electron-beam Technology of Applying Thermal Protection Coating. Novye tehnologicheskie processy i nadezhnost' GTD , CIAM — Modern process industries and reliability of HGP, Central Institute of Aviation Motors, 2008. Issue 7. Pp. 144-158. (in Russian).

4. Baldaev, L.H., Vahalin, V.A., Borisov, V.N. Geotermicheskoe napylenie: uchebnoe posobie [Geothermal evaporation: textbook]. М.: Market DS, 2007. 344 p. (in Russian).

5. Tamarin, Ju.A., Kachanov, E.B. Properties of Thermal Protection Coatings Applied by Means of Electron-beam technology. Novye tehnologicheskie processy i nadezhnost' GTD, CIAM — Modern process industries and reliability of HGP, Central Institute of Aviation Motors, 2008. Issue 7. Pp. 125-144. (in Russian).

6. Xianliang JIANG, Chunbo LIU, Feng LIN. Overview on the Development of Nanostructured Thermal // J. Mater. Sci. Technol., 2007. Vol. 23. № 4. P. 454.

7. Fajzullin, R.R., Tolmachev, I.M., Aksenov, A.N. Formation of Thermal Protection Coatings on Turbine Blades by Zr-Y salt pyrolysis in low-temperature plasma [Formirovanie teplozashhitnyh pokrytij lopatok turbin metodom piroliza solej Zr-Y v nizkotemperaturnoj plazme]. Mat-ly nauchnoj konferencii IMENIT-2012 (Proc. of scientific conf. Institute of mathematics, natural Sciences and information technologies — 2012). Tyumen, 2012. Pp. 40-43. (in Russian).

8. Jordan, E.H., Gell, M. Nano Crystalline Ceramic and Ceramic Coatings Made by Conventional and Solution Plasma Spray // University of Connecticut Storrs. CT 06269 USA. P. 13.

9. Hengbei Zhao, Fengling Yu, Ted D. Bennett, Haydn N.G. Wadley. Morphology and thermal conductivity of yttria-stabilized zirconia coatings // Acta Materialia 54 (2006). Pp. 5195-5207.

10. Jordan, E.H., Gell, M., Bonzani, P., Chen, D., Basu, S., Cetegen, B., Wu, F. Making Dense Coatings with the Solution Precursor Plasma Spray Process // Inframat Corporation. Farmington CT USA. Pp. 1-4.

11. Bhatia, T., Ozturk, A., Liangde Xie, Jordan, E. H. and Baki M. Cetegen, Gell, M., Xinqin Ma, Nitin P. Padture. Mechanisms of ceramic coating deposition in solution-precursor plasma spray // Materials Research Society J. Mater. Res., Vol. 17, №. 9, Sep 2002. Pp. 2363-2372.

12. Nicholls, J.R., Lawson, K.J., Johnston, A., Rickerby, D.S. Low Thermal Conductivity EB-PVD Thermal Barrier Coatings, High Temperature Corrosion 5 (Editors: R.Streiff, I.J. Wright, R.Krutenat, M.Caillet, A. Cailerie), Trans Tech Publication, 2001. Pp. 595-606.