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

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مواد پیشرفته در مهندسی
دوره 38، شماره 2
شهریور 1398
صفحه 35-53

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