Journal of Advanced Materials and Technologies

Journal of Advanced Materials and Technologies

Interface Thermal Stability Diffusion Aluminide and Silicon Aluminide Coatings with Ni-Based Superalloy GTD- 111

Authors
Korosh Shirvani 1
Hojatolah Esmaili 2
1 Iranian Research Organization for Science and Technology (IROST), Department of Advanced Materials and New Energies, Tehran, Iran.
2 Department of Materials Engineering, Najafabad Branche, Islamic Azad University, Isfahan, Najafabad, Iran.
10.30501/jamt.2637.70305
Abstract
Thermal stability of aluminide coatings are affected by chemical and phase changes of the coating and
coating/substrate interface. In this paper the coating thickness and structure stabilities within interfaces of both simple
and silicon-modified aluminide coatings with GTD-111 superalloy substrate were investigated. The coatings were
prepared by high-activity pack aluminizing and slurry aluminizing, respectively. Thermal stability test was conducted in
950 ˚C for 1000 h. Microstructural changes of the coatings during high temperature exposure were characterized by
optical and scanning electron microscopes. The results indicated that the substrate/coating interfaces in both coatings
comprised of two diffusion layers of PID and SID during 100-1000 h of the high-temperature exposure. However, it
was found that Si has a minor effect on the phase morphology and widening of the PID and SID in the aluminide
coatings.
Keywords
Thermal Stability
Aluminide Coating
Silicon
Interface
Ni-Based Superalloy GTD - 111
  1. J.R. Davis, ASM Specialty Handbook: Heat Resistant Materials, ASM International, USA, 1997.
  2. S. Bose, High Temperature Coatings, utterworth-Heinemann, USA, 2007.
  3. Y. Tamarin, Protective Coatings for Turbine Blades, ASM International, USA, 2002.
  4. Q. Wu, R.B Yang, Y.X Wu, S.S Li, Y. MA and S.K Gong, A comparative study of four modified Al coatings on Ni3Al-based single crystal superalloy, Progress in Natural Science: Materials International, 21 (2011) 496-505.
  5. R. Marveh, C. Duret, R. Pichoir, Pack cementation process, Materials Science and technology 2 (1986) 201-206.
  6. A. Firouzi and K. Shirvani, The structure and high temperature corrosion performance of medium-thickness aluminide coatings on nickel-based superalloy GTD-111, Corrosion. Science. 52 (2010) 3579-3585.
  7. K. Shirvani, M. Saremi, A. Nishikata and T. Tsuru, The Effect of Silicon on cyclic Oxidation behavior of Aluminide coatings on Superalloy In-738LC, Material Science Forum, 461 (2004) 335-339.
  8. K. Shirvani, M. Saremi, A. Nishikata and T. Tsuru, Electrochemical study on hot corrosion of Si-modified aluminide coated In-738LC in Na2SO4-20 wt. % NaCl melt at 750 °C, Corrosion Science 45 (2003) 1011-1021.
  9. K. Shirvani, M. Saremi, A. Nishikata and T. Tsuru, The Role of Silicon on Microstructure and High Temperature Performance of Aluminide Coating on Superalloy In-738LC, Material Transactions, JIM 43 (2002) 2622-2627.
  10. K. Shirvani, S. Mastali, A. Rashidghamat, H. Abdollahpour, The effect of silicon on thermal shock performance of aluminide-thermal barrier coatings, Corrosion Science, 75 (2013) 142-147.
  11. L. Singheiser, H.W. Grunling and K. Schneider, Chemical compability of coated systems at high temperature, Surface and Coating Technology, 42 (1990) 101-117.
  12. G.S. Young, D.L. Deadmore, An Experimental Low Cost Silicon/Aluminide High Temperature Coating for Superalloys, Thin Solid Films, 73 (1980) 373-378.
  13. A.B Smith, A Kempster and J Smith, Vapour aluminide coating of internal cooling channels, in turbine blades and vanes. Surface and Coatings Technology 120 (1999) 112-117.
  14. Y.H. Zhang, D.M. Knowles and P.J. Withers, Microstructural development in Pt-aluminide coating on CMSX-4 superalloy during TMF, Surface and Coating Technology 107 (1998) 76-83.

 

 

 

 

 

 

 

 

 

 

 

         

                                                                           

 

 

 

 

 

 

 

 

 

 

 

Journal of Advanced Materials and Technologies
Volume 4, Issue 3
Autumn 2015
Pages 33-37

  • Receive Date 08 August 2015
  • Revise Date 08 November 2015
  • Accept Date 14 November 2015