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بررسی اثر الکترولیت بر ریزساختار و ریخت‌شناسی پوشش‌های اکسایش الکترولیتی پلاسمایی روی تیتانیم

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دکتری، دانشکده مهندسی مواد و متالورژی، دانشگاه صنعتی امیرکبیر (پلی‌تکنیک تهران)، تهران، تهران، ایران

2 دانشیار، دانشکده مهندسی مواد و متالورژی، دانشگاه صنعتی امیرکبیر (پلی‌تکنیک تهران)، تهران، تهران، ایران

3 مرکز مطالعات و همکاری‌های علمی بین‌المللی، وزارت علوم، تحقیقات و فناوری، تهران، تهران، ایران

4 استاد، دانشکده مهندسی متالورژی و مواد، دانشگاه فنی استانبول، استانبول، استانبول، ترکیه

چکیده

لایه‌های سرامیکی متخلخل حاوی TiO2 به روش اکسایش الکترولیتی پلاسمایی (PEO) با استفاده از محلول‌های پایه هیدروکسید، استات و فسفات، روی تیتانیم سنتز شدند. تأثیر الکترولیت‌های مختلف بر آرایش فازها و ویژگی‌های ریزساختاری پوشش‌های سرامیکی به­وسیله پراش پرتو ایکس، میکروسکوپ الکترونی روبشی نشر میدانی و طیف‌سنجی پراش انرژی پرتو ایکس مورد بررسی قرار گرفت. نتایج نشان داد که استفاده از الکترولیت پایه هیدروکسید پتاسیم می‌تواند به یک ساختار ناهمگن منجر شود؛ در­حالی‌که لایه ایجادشده با استفاده از محلول پایه استاتی، دارای حفره‌های بزرگ یکنواخت در زمینه‌ای آمیخته از فازهای روتایل و تیتانات کلسیم است. استفاده از محلول پایه فسفاتی می‌توانست به تشکیل لایه متخلخل بهینه‌ای متشکل از آناتاز منتهی شود. نتایج سطح مقطع پوشش‌ها نشان داد که استفاده از محلول پایه استاتی منجر به تشکیل پوششی شامل دو لایه متفاوت می‌شود. در نهایت، سازوکار تشکیل پوشش و ریزساختار به‌دست‌ آمده با استفاده از الکترولیت پایه فسفاتی، مورد بحث قرار گرفت و به‌صورت نموداری نشان داده شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the Effect of Electrolyte on Microstructure and Morphology of the Plasma Electrolytic Oxidation Coatings on Ti

نویسندگان [English]

  • Elham Ahounbar 1
  • Seyed Mohammad Mousavi Khoei 2 3
  • Mustafa Ürgen 4

1 Ph. D., Department of Materials and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Tehran, Iran

2 Associate Professor, Department of Materials and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Tehran, Iran|Associate Professor, Department of Materials and Metallurgical Engineering, Amirkabir University

3 Associate Professor, Department of Materials and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Tehran, Iran|Associate Professor, Department of Materials and Metallurgical Engineering, Amirkabir University

4 Professor, Department of Metallurgical and Materials Engineering, Istanbul Technical University, Istanbul, Istanbul, Turkey

چکیده [English]

Abstract     The porous ceramic layers of TiO2 were synthesized on Titanium through Plasma Electrolytic Oxidation (PEO) process, using three different electrolytes including hydroxide-based, acetate-based, and phosphate-based solutions. The effects of utilizing different electrolytes on the phase arrangement and microstructural characteristics of the ceramic coatings were then studied using X-ray diffraction, field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The results showed that utilizing a KOH-based electrolyte can lead to a heterogeneous structure while the layer that is formed during the PEO process in the acetate-based electrolyte can provide large homogeneous pores in the matrix of rutile-TiO2 and CaTiO3 phases. Using the phosphate-based electrolyte could cause an optimum porous layer consists of anatase-TiO2. The results of cross-section of the samples showed that utilizing the acetate-based electrolyte can lead to formation of the PEO coating including two sublayers. The formation mechanism and microstructural outcome of using phosphate-based electrolyte were finally discussed and graphically illustrated.

کلیدواژه‌ها [English]

  • Titanium
  • Ceramic Coating
  • Plasma Electrolytic Oxidation
  • Phosphate-Based Electrolyte
  • Microstructure
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مواد و فناوری‌های پیشرفته
دوره 10، شماره 3
آذر 1400
صفحه 45-55
فایل ها
سابقه مقاله
  • تاریخ دریافت: 21 بهمن 1399
  • تاریخ بازنگری: 18 اردیبهشت 1400
  • تاریخ پذیرش: 08 آذر 1400
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