تأثیر لایه پلاتین و روش آلومینایزینگ بر زبری سطح سوپرآلیاژ پوشش داده شده توسط پلاتین- آلومیناید

نویسندگان

1 1. مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر تهران

2 2. سازمان پژوهش‌های علمی- صنعتی ایران، پژوهشکده مهندسی مواد و انرژی‌های نو

چکیده

در این پژوهش، تغییرات زبری سطح سوپرآلیاژ Rene80 پوشش­داده شده توسط پلاتین آلومیناید، تحت تأثیر مشخصه­ های ریزساختار و ترکیب شیمیایی پوشش بررسی شده است. بدین منظور لایه پلاتین با ضخامت­ های 2، 4، 6 و 8 میکرومتربه‌روش رسوب­دهی الکتریکی ایجاد و سپس پوشش نفوذی آلومینیم به دو روش دما بالا- اکتیویته پایین و دما پایین- اکتیویته بالا روی سطح اعمال شد. در ادامه عملیات حرارتی پیرسازی روی آلیاژ پوشش­دار انجام گرفت. نتایج بررسی­ های ساختاری توسط میکروسکوپ الکترونی و آنالیز پراش اشعه ایکس، نشان­دهنده وجود ساختار سه لایه­ ای در تمامی ضخامت­ ها از پلاتین و در دو روش آلومینایزینگ بود. زبری سطح در سه مرحله و بعد از 1- اعمال لایه پلاتین 2- عملیات حرارتی این لایه و 3- فرایند آلومینایزینگ و پیرسازی، اندازه­گیری شد. نتایج بیانگر رابطه مستقیم افزایش زبری سطح با افزایش ضخامت پلاتین و ضخامت نهایی پوشش بوده است، به نحوی که کمترین زبری در ضخامت دو میکرومتر از پلاتین و در حالت اکتیویته پایین- دما بالا به میزان 6/2 میکرومتر و بیشترین زبری سطح در ضخامت 8 میکرومتر از پلاتین و در حالت اکتیویته بالا- دما پایین و به میزان 8/8 میکرومتر مشاهده شد.

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Platinum Layer and Aluminizing Process on Surface Roughness of Coated Superalloy by Pt-Al

نویسندگان [English]

  • M. Barjesteh 1
  • K. Zangeneh Madar 1
  • S. M. Abbasi 1
  • K. Shirvani 2
1 1. Metallic Materials Research Center, Malek Ashtar University of Technology (MUT), Tehran, Iran.
2 2. Department of Advanced Materials and New Energies, Iranian Research organization for Science and Technology (IROST), Tehran, Iran.
چکیده [English]

In this study, the effect of platinum-aluminide coating parameters on surface roughness of nickel-based superalloy Rene®80 was evaluated. For this purpose, different thicknesses of Pt-layer (2, 4, 6 and 8µm) were plated on the Samples. Then diffusion aluminide coating in two types, high tempeature-low activity and low temperature-high activity was performed. The results of structural investigations by scanning electron microscope and X-Ray diffraction indicated a three-zone structure of coating in all thicknesses of platinum layer, as well as in the two methods of aluminizing. Surface roughness of coatings was measured in three steps: 1-after Pt plating, 2-after Pt diffusion, and 3-after aluminizing and final aging. The results showed that the thickness of Pt and the final thickness of the coating   directly affected the surface roughness. The minimum surface roughness was created by high temperature low activity with 2µ of Pt-layer (2.6μm) and the maximum of surface roughness was obtained in low-temperature high activity with 8µ of the Pt-layer (8.8 μm).

کلیدواژه‌ها [English]

  • Rene80
  • Platin-Aluminide
  • Coating Microstructure
  • surface roughness
1. Safari, J., Nategh, S., and Sims, C. T., “On the Heat Treatment of Rene-80 Nickel-Base Superalloy”, Journal of Materials Processing Technology, Vol. 17, pp. 240-250, 2006.
2. Streiff, R., “Protection of Materials by Advanced High Temperature Coatings, Primary lecture”, Journal de Physique IV, Vol. 3, No. 9, pp. 17-42, 1993.
3. Shahriari, F., Ashrafizadeh, F., and Saatchi, A., “Formation Mechanism of Titanium Diffusion Coating on Nickel-Based Superalloy B-1900”, Journal of Advanced Materials in Engineering, Vol. 31, No. 2, pp. 13-22, 2012.
4. Esin, V., Maurel, V., Breton, P., Koster, A., and Selezneff, S., “Increase in Ductility of Pt-Modified Nickel Aluminide Coating with High Temperature Ageing”, Acta Materialia, Vol. 105, pp. 505-518, 2016.
5. Liya, Y., Hongfei, C., Bin, L., Guang, Y., Hongjie, L., and Yanfeng, G.,“Effect of Pt Content on Initial TGO Formation and Available Al Reserve of PtAl Coatings During Thermal Cycling”, Surface & Coatings Technology, Vol. 337, pp. 82-89, 2018.
6. Liya, Y., Hongfei, C., Guang, Y., Bin, L., and Yanfeng, G.,“Oxidation Behavior of Hf-Modified Platinum Aluminide Coatings During Thermal Cycling”, Progress in Natural Science: Materials International, Vol. 28, pp. 34-39, 2018.
7. Das, D. K., Singh V., and Joshi, S. V.,“Effect of Prealuminizing Diffusion Treatment on Microstructural Evolution of High-Activity Pt-Aluminide Coatings”, Metallurgical and Materials Transaction A, Vol. 31 A, No. 8, pp. 2037-2047, 1999.
8. Rafiee, H., Arabi, H., and Rastegari, S.,“Effects of Temperature and Al-Concentration on Formation Mechanism of an Aluminide Coating Applied on Superalloy In738LC Through a Single Step Lowactivity Gas Diffusion Process”, Journal of Alloys and Compounds, Vol. 505, pp. 206-212, 2010.
9. Wang, Y. Q., and Sayre, G., “Factors Affecting the Microstructure of Platinum-Modified Aluminide Coatings During a Vapor Phase Aluminizing Process”, Surface and Coatings Technology, Vol. 203, pp. 1264-1272, 2009.
10. Yin, J., Cai, W., Zheng, Y., and Zhao, L.,“Effects of Pt Thickness on PtSi Formation and Film Surface Morphology”, Surface and Coating Technology, Vol. 198, pp. 329-334, 2005.
11. Metal Standards & Specifications for Investment Castings,General Electric (GE) Aircraft Engines pecification, C50TF28. Issue S17, p. 1, 1996.
12. Rose, I., and Whittington, C., Nickel Plating Handbook, Nickel Institute, Belgium, p. 15, 2014.
13. Baumgartner, M. E., and Raub, Ch. J., “The Electrodeposition of Platinumand Platinum Alloys”, Platinum Metals Rev, Vol. 32, pp. 188-197, 1988.
14. Rashidghamat, A., Shirvani, K., and Firouzi, S., “Electrodeposition of Platinum on Nickel-Base Superalloy Rene-80”, EFC Workshop on Solutions for High Temperature Corrosion Protection in Energy Conversion System, EFCEventNo. 321, DECHEMA-House, Frankfurt, Germany, 24, 2009.
15. Skinner, P. E., “Improvements in Platinum Plating a New Generation of Electroplating Bathes”, Platinum Metals Rev, Vol. 33, pp. 102-105, 1989.
16. Yavorska, M., and Sieniawski, J., “Effect of Diffusion on Platinum Coatings Deposited on the Surface of Nickel Based Superalloy by the Electroplating Process”, Archives of Materials Science and Engineering, Vol. 45, No. 1, pp. 56-60, 2010.
17. Shirvani, K., Firouzi, S., and Rashidghamat A., “Microstructures and Cyclic Oxidation Behaviour of Pt-free and Low-Pt NiAl Coatings on the Ni-Base Superalloy Rene-80”, Corrosion Science, Vol. 55, pp. 378-384, 2012.
18. Bose, S., High Temperature Coating Book, 2nd ed. Oxford: Butterworth-Heinemann, p. 77, 2017.
19. Krishna, G. R., Das D. K. and Singh, V.,“Role of Pt Content in the Microstructural Development and Oxidation Performance of Pt–Aluminide Coatings Produced using a High-Activity Aluminizing Process”, Materials Science and Engineering A, Vol. 251, pp. 40-47, 1998.
20. ASTM E3-11, Standard Guide for Preparation of Metallographic Specimens, ASTM Committee, 2011.
21. ASTM E883 – 11, Standard Guide for Reflected-Light Photomicrography, ASTM Committee, 2011.
22. DIN 4768, Determination of Values of Surface Roughness Parameters Ra, Rz, Rmax, 1990.
23. Warnes, B. M., Dushane N. S., and Cockerill, J. E., “Cyclic Oxidation of Diffusion Aluminide Coatings on Cobalt Base Superalloys”, Surface and Coatings Technology, Vol. 148, No. 2, pp. 163-170, 2001.
24. Chen, S., Ke, F., Zhou, M., and Bai, Y., “Atomistic Investigation of the Effects of Temperature and Surface Roughness on Diffusion Bonding Between Cu and Al”, Acta Mater. Vol 55, pp. 3169-3175, 2007.
25. Masina, C. J., “Annealing Effects on Pt Coating Morphology”, Ph.D Thesis, University of Zulzland, 2009.
26. ASM Handbook, Surface Engineering, Vol. 5, p. 1767, 2000.
27. Pedraza, F., Kennedy, A. D., Kopecek, J., and Moretto, P., “Investigation of the Microstructure of Platinum-Modified Aluminide Coatings”, Surface and Coatings Technology, Vol. 200, No. 12, pp. 4032-4039, 2006.
28. Kiruthika, P., and Paul A., “A Pseudo-Binary Interdiffusion Study in the β-(Ni,Pt)Al Phase,” Philosophical Magazine Letters, Vol. 95, pp. 138-144, 2015.
29. Zhang, Z. X., Jiang , H., Russell , A. M., Skrotzki, W., Müller, E., Schneider, R., Gerthsen, D., and Cao, G. H., “Microstructural Evolution and Phase Transformation in the Liquid-Solid Al/Ni Diffusion Couple”, Philosophical Magazine, pp. 1-18, 2019.
30. Boone, D. H., Deb, P., Purvis, L. I., and Rigney, D. V., “Surface Morphology of Platinum Modified Aluminide Coatings”, Journal of Vacuum Science & Technology A, Vol. 3, No. 6, pp. 2557-2563, 1985.

تحت نظارت وف ایرانی