نوع مقاله : مقاله کامل پژوهشی
نویسندگان
گروه مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه ملایر، ملایر، ایران.
چکیده
آلیاژ نایتینول (NiTi) به دلیل در بر برداشتن خواصی همانند انعطاف انعطاف پذیری فوق فوق العاده با کرنش زیاد قابل بازگشت، اثرحافظه داری ، ویژگی‌های میرایی بالا، مقاومت خوردگی و زیست سازگاری خوب، دارای کاربرد وسیعی در ساخت قطعات پزشکی و بایو مواد، همانند استنت ها، ایمپلنت های ارتوپدی و ابزارهای جراحی است. اما یکی از مهمترین مشکلات آلیاژ نایتینول، آزاد شدن یون‌های نیکل ناشی از تخریب سطح نمونه است، که این یون می‌تواند به عنوان بازدارنده در فرایندهای آنزیمی موثر در سنتز پروتیین و تکثیر سلول دخالت نماید. اعمال پوشش و کاشت یونی از مهمترین روش ها جهت بهبود سطحی و رفتار زیستی آلیاژ NiTi است. در این تحقیق بهبود سطحی از طریق کربن دهی به وسیله فرایند کاشت یونی پلاسمایی (CPIII) بر روی سطح آلیاژ NiTi صورت گرفته و سپس رفتار نانومکانیکی پوشش بوسیله توسط میکروسکوپ نیروی اتمی (AFM) و روش های نانودندانه گذاری و نانو نانوخراش و رفتار خوردگی به وسیله آزمون پلاریزاسیون در محلول 5/0 مولار نمک طعام مورد بررسی قرار گرفته است. نتایج بیانگر سطح کاملا همگن، یکنواخت و عاری از نواقص سطحی با عمق کاشت یونی کربن در حدود 50 نانومتر همراه با کاهش میانگین زبری سطحی از 34 به 25 نانومتر است. فرایند کاشت یونی منجر به افزایش سختی و مدول الاستیک به ترتیب 7/80 و 8/21 درصد، کاهش ضریب اصطکاک متوسط از 21/0 به 16/0 و باعث غالب بودن مکانیزم سازوکار سایش برشی همراه با افزایش 85 درصدی بازده مقاومت به خوردگی گردیده است.
کلیدواژه‌ها
عنوان مقاله [English]
Investigation Nano-Mechanical Properties of NiTi alloy Modified by Carbon Plasma Immersion Ion Implantation
نویسندگان [English]
- Ali Shanaghi
- Zahra Ahmadian
- Ali Reza Souri
Department of Materials Engineering, Faculty of Engineering, University of Malayer, Malayer, Iran.
چکیده [English]
Due to ultra-high flexural flexibility, shape memory effect, high damping properties, corrosion resistance and good biocompatibility, the nitinol alloys (NiTi) are widely used in the manufacture of medical and biocompatible materials, such as stent, orthopedic implants and surgical instruments. But one of the most important problems of NiTi alloy is the release of nickel ions due to the destruction of the surface, which these ions can interfere with the enzymatic processes involved in protein synthesis and cell proliferation. The applied coating and ion implantation is one of the most important methods for improving the surface and behavior of the NiTi alloy. In this study, surface of NiTi alloy was modified by carbon plasma immersion ion implantations (CPIII). Then nanomechanical properties of coating were surveyed by atomic force microscopy (AFM) with nano-indentation, nano-scratch methods, and also corrosion behavior was investigated by polarization test in 0.5 M NaCl solution. The results indicate a completely homogeneous, uniform and free surface imperfection with a carbon ion implantation depth of about 50 nm, and decreased average surface roughness from 34to 25 nm. The ion implantation process resulted in increasing the hardness and elastic modulus of 80.7% and 21.8%, respectively, and reducing the average friction coefficient from 0.21 to 0.16, and also making dominant the shear wearing mechanism, with a 85% increase in corrosion resistance efficiency.
کلیدواژه‌ها [English]
- Carbonizing
- Plasma immersion ion implantation
- NiTi alloy
- Nano-mechanical properties
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