Effect of Aluminum Content in Pack Cementation Mixture on Microstructure and Cyclic Oxidation Performance of Zr-modified Aluminide Coatings

Subject Areas : journal of New Materials

ایمان Khakpour ¹ , R. Soltani ² , M. Heydarzadeh Sohi ³

1 - دانشجوی کارشناسی ارشد، دانشگاه تهران، پردیس دانشکده های فنی، دانشکده مهندسی متالورژی و مواد
2 - استادیار ، دانشگاه تهران، پردیس دانشکده های فنی، دانشکده مهندسی متالورژی و مواد
3 - استاد ، دانشگاه تهران، پردیس دانشکده های فنی، دانشکده مهندسی متالورژی و مواد

Received: 2016-07-26 Accepted : 2016-07-26 Published : 2016-04-20

Keywords: cyclic Oxidation, Bond Coat, modified Aluminide Coatings, pack cementation, Zirconium,

Abstract :

      A suitable bond coat to control the spallation is recommended for increasing service life of the coatings. Using modified aluminide coatings as a bound coat has become a common approach nowadays. In this work, a zirconium modified nickel aluminide coating was formed by pack cementation process and the effect of the percentage of aluminum in Al-Cr alloy, which was used as the source of aluminum in coating process, was studied. ZrOCl2.8H2O and alumina were also used as activator and filler material, respectively. Cyclic high-temperature oxidation test was carried out at 1100 °C. Each cycle was consisted of one hour heating in furnace and 10 minutes cooling in the air. Microstructures of the coatings were investigated by means of SEM. EDS analyses were carried out to specify chemical composition of different layers of the coating. Phase analysis was examined by XRD. The results confirmed that the coatings produced by high activity of aluminum source, showed higher resistance to cyclic high-temperature oxidation.

References:

1- Y. Tamarin, Protective coatings for turbine blades: ASM International (OH), 2002.

2- N. Birks, G. H. Meier, and F. S. Pettit, Introduction to the high temperature oxidation of metals: Cambridge University Press, 2006.

3- S. Bose, High temperature coatings: Butterworth-Heinemann, 2007.

4- ف. تلاتری، م. جعفر هادیان فرد، ر. امینی، م. علیزاده، "مشخصه یابی و بررسی خواص دی الکتریک الکتروسرامیک های نانوبلور پایه اکسید نیکل سنتز شده، به روش آلیاژسازی مکانیکی" مجله مواد نوین، دوره ۴، شماره ۱۴، صفحه ۵۴-۴۱، زمستان ۱۳۹۲."

5- S. Hwang and P. Shen, "Microstructures and crystallographic relationships in aluminized coatings on IN713LC and MAR-M247," Materials Science and Engineering, vol. 94, pp. 243-250, 1987.

6- Z. Xiang, J. Burnell-Gray, and P. Datta, "Aluminide coating formation on nickel-base superalloys by pack cementation process," Journal of Materials Science, vol. 36, pp. 5673-5682, 2001.

7- Z. Zhan, Y. He, L. Li, H. Liu, and Y. Dai, "Low-temperature formation and oxidation resistance of ultrafine aluminide coatings on Ni-base superalloy," Surface and Coatings Technology, vol. 203, pp. 2337-2342, 2009.

8- B. Gupta, A. Sarkhel, and L. Seigle, "On the kinetics of pack aluminization," Thin Solid Films, vol. 39, pp. 313-320, 1976.

9- M. Hetmańczyk, L. Swadźba, and B. Mendala, "Advanced materials and protective coatings in aero-engines application," Journal of Achievements in Materials and Manufacturing Engineering, vol. 24, pp. 372-381, 2007.

10- M. S. A. Littner, "Performance and thermal stability of Pt-modified Al-diffusion coatings for superalloys under cyclic and isothermal conditions" Materials at High Temperatures, vol. 22, pp 411-420, 2005.

11- A. J. Hickl and R. W. Heckel, "Kinetics of phase layer growth during aluminide coating of nickel," Metallurgical and Materials Transactions A, vol. 6, pp. 431-440, 1975.

12- X. Ma, Y. He, D. Wang, and J. Zhang, "Superior high-temperature oxidation resistance of a novel Al2O3–Y2O3/Pt laminated coating," Applied Surface Science, vol 258, pp. 4733–4740, 2012.

13- P. Hou and J. Stringer, "The effect of reactive element additions on the selective oxidation, growth and adhesion of chromia scales," Materials Science and Engineering: A, vol. 202, pp. 1-10, 1995.

14- S. Hamadi, M. P. Bacos, M. Poulain, A. Seyeux, V. Maurice, and P. Marcus, "Oxidation resistance of a Zr-doped NiAl coating thermochemically deposited on a nickel-based superalloy," Surface and Coatings Technology, vol. 204, pp. 756-760, 2009.

15- D. Li, H. Guo, D. Wang, T. Zhang, S. Gong, and H. Xu, "Cyclic Oxidation of β-NiAl with Various Reactive Element Dopants at 1200 °C," Corrosion Science, vol 66, pp. 125-135, 2012.

16- P. Y. Hou and K. Priimak, "Interfacial segregation, pore formation, and scale adhesion on NiAl alloys," Oxidation of Metals, vol. 63, pp. 113-130, 2005.

17-P. Y. Hou and V. Tolpygo, "Examination of the platinum effect on the oxidation behavior of nickel-aluminide coatings," Surface and Coatings Technology, vol. 202, pp. 623-627, 2007.

18- D. Lees, "On the reasons for the effects of dispersions of stable oxides and additions of reactive elements on the adhesion and growth-mechanisms of chromia and alumina scales-the “sulfur effect”," Oxidation of metals, vol. 27, pp. 75-81, 1987.

19- P. Fox, D. Lees, and G. Lorimer, "Sulfur segregation during the high-temperature oxidation of chromium," Oxidation of metals, vol. 36, pp. 491-491, 1991.

20- W. Gao, Developments in high temperature corrosion and protection of materials: Elsevier, 2008.