تأثیر اتمسفر بر خواص ساختاری و مکانیکی پوشش تیتانیم‌نیترید لایه نشانی‌شده روی آلیاژ حافظه‌دار نیکل-تیتانیم به روش پلاسمای فوکوس از نوع مدر

نوع مقاله : مقاله پژوهشی

نویسندگان

مرکز تحقیقات مواد پیشرفته، دانشکده مهندسی مواد، دانشگاه صنعتی سهند، تبریز، ایران

چکیده

مقدمه و اهداف: آلیاژهای نیکل-تیتانیم سختی و خواص تریبولوژیکی ضعیفی دارند. در به‌کارگیری این آلیاژها برای کاربردهای پزشکی نظیر اتصالات مصنوعی مفصل استخوان‌ها، احتمال شل شدن ناشی از سایش وجود دارد. با ایجاد پوشش‌هایی نظیر تیتانیم نیترید می‌توان سختی، مقاومت سایشی و خوردگی سطوح را افزایش داد. تمرکز اصلی پژوهش بر این است که چگونه اتمسفر پوشش‌دهی می‌تواند نه تنها بر خواص مورفولوژیکی و ریزساختاری بلکه بر رفتار خورگی و مکانیکی پوشش‌ها تأثیر بگذارد. 
مواد و روش‌ها: این مطالعه، استفاده مؤثر از روش پلاسمای فوکوس چگال را برای رسوب پوشش‌های نیترید تیتانیم بر روی آلیاژهای حافظه‌دار در اتمسفرهای مختلف را نشان می‌دهد. اتمسفرهای مورد استفاده: (1) 50 درصد حجمی آرگون، 50 درصد حجمی نیتروژن و (2) 75 درصد حجمی آرگون، 25 درصد حجمی نیتروژن بودند. 
یافته‌ها: عملیات نیتروراسیون در شرایط ذکرشده، باعث افزایش سختی نمونه‌ها شده است. سختی متوسط در نمونه‌های 0.5N2-7 و 0.25N2-7 به‌ترتیب نزدیک به HV 459 و HV 410/5 به‌دست آمد. در فاصله‌ ثابت آند از سطح نمونه، با کاهش نسبت نیتروژن به کل گاز ورودی، میزان کندوپاش در محفظه افزایش یافته و به افزایش ضخامت پوشش منجر می‌شود. ضخامت پوشش در نمونه‌های 0.5N2-7 و 0.25N2-7 به‌ترتیب
µm 0/91 و  µm 1/75 به‌دست آمد.  
نتیجه‌گیری: تصاویر میکروسکوپی الکترونی روبشی از سطح پوشش‌ها نشان داد که فرایند نیتروژن‌دهی در محیط 75 درصد حجمی آرگون، 25 درصد حجمی نیتروژن، روش مؤثرتری برای جلوگیری از ترک خوردن سطح است. علاوه بر این، در این اتمسفر با کاهش نسبت نیتروژن به کل گاز ورودی، به افزایش ضخامت پوشش و بهبود رفتار خوردگی منجر شد.
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Atmospheric Influence on the Structural and Mechanical Properties of TiN Coating Deposited on NiTi Shape Memory Alloy via Mather-Type Dense Plasma Focus

نویسندگان [English]

  • Mahdiyeh Soltanalipour
  • Jafar Khalil-Allafi
Research Center for Advanced Materials, Faculty of Materials Engineering, Sahand University of Technology, P. O. Box, 51335-1996, Tabriz, Iran
چکیده [English]

Introduction and Objectives: Nickel-titanium alloys have poor hardness and tribological properties. There is a possibility of loosening caused by wear while using these alloys for medical applications such as artificial bone joints. The hardness, wear resistance, and corrosion resistance of the surfaces can be improved by deposition of coatings such as TiN. The study's main objective was to investigate how the deposition atmosphere affects the morphological and microstructural properties and the mechanical and corrosion behavior of the coatings.
Materials and Methods: This study demonstrates the effective use of the dense plasma focus method to deposit titanium nitride coatings onto nickel-titanium shape memory alloys in various atmospheric conditions. The atmospheres used were (i) 50 vol. % argon and 50 vol. % nitrogen, and (ii) 75 vol. % argon and 25 vol. % nitrogen.
Results: Nitriding process under the above-mentioned conditions increased the hardness of the samples. The average hardness of samples 0.5N2-7 and 0.25N2-7 were obtained to be ~ 459 HV and 410.5 HV, respectively. At a constant distance from the anode to the sample surface, with a decrease in the ratio of nitrogen to the total inlet gas, the sputtering rate in the chamber increases and leads to an increase in the coating thickness. The coating thickness of samples 0.5N2-7 and 0.25N2-7 were obtained to be 0.91 µm and 1.75 µm, respectively.
Conclusion: Scanning electron microscope images of the coating surfaces indicated that the nitriding process in the 75 vol. % argon and 25 vol. % nitrogen environment was more effective in preventing cracking. Additionally, lowering the nitrogen ratio in the atmosphere led to a higher sputtering rate within the chamber, contributing to an increase in coating thickness and improved corrosion resistance.

کلیدواژه‌ها [English]

  • Dense Plasma Focus
  • NiTi alloy
  • TiN coating
  • Structural properties
  • Corrosion behavior

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