Development of the Advanced TBC for High Efficiency Gas Turbine

Abstract:

Since 2004, Mitsubishi has been pursuing a 1,700°C gas turbine as part of the Japanese National Project [1][2]. One of the most important key technologies for the target is thermal barrier coatings (TBCs) which are capable of improving cooling efficiency of hot parts. With increasing the turbine inlet temperature, TBCs surface temperature is also rising up. In addition, the temperature gradient through TBCs thickness must steepen as a result of keeping metal temperature. Both have a significant effect on durability such as spallation and erosion of TBCs. To evaluate these issues, thermal cycle test and hot erosion test were introduced. After the screening of those component tests, the advanced TBCs coated in the first unit of M501J were verified at our pilot plant called T-point. Sound condition for row 1 blades and vanes had been confirmed after over 3 year operation.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 1980-1986
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.1980
• Online since: November 2016
• Authors: Taiji Torigoe*, Yoshifumi Okajima, Ikuo Okada, Junichiro Masada, Keizo Tsukagoshi
• Keywords: Erosion Test, Gas Turbine, Thermal Barrier Coatings (TBCs), Thermal Cycle Test

References

[1] Tsukagoshi, K. et al, 2007, Development of 1700ºC Class Gas Turbine Technology, Mitsubishi Technical Review, Vol44, No1.

[2] Ito, E. et al., 2007, Development of Key Technologies for the Next Generation Gas Turbine, ASME Turbo Expo 2007 GT2007- 28211.

DOI: 10.1115/gt2007-28211

[3] Torigoe T. et al., 1993, Zirconia TBC Application in Power Generating Gas Turbine", Proceedings of ASM 1993 Materials Congress Materials Week, 93, Oct. 17-21, pp.131-134.

[4] Ohara M., Takakashi K., Torigoe T., Yamaguchi K., 1999, Long-term Field Experience of Thermal Barrier Coating for Heavy Duty Gas Turbine", Proceeding of the International Gas Turbine Congress 1999 Kobe, IGTC, 99Kobe TS-76, pp.821-824.

[5] Torigoe, T. et al., 2011, Development of Advanced Thermal Barrier Coating for the Next Generation Gas Turbine, IGTC2011-180, Proceedings of the International Gas Turbine Congress 2011 Osaka, Nov. 13-18.

[6] Yuri M. et al., 2013, Development of 1600°C-Class High-efficiency Gas Turbine for Power Generation Applying J-Type Technology, Mitsubishi Heavy Industries Technical Review, Vol. 50, No. 3, pp.1-10.