نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 دانشجوی دکترا، دانشکده مهندسی مواد و متالورژی، دانشگاه صنعتی امیرکبیر، تهران، ایران
2 دانشیار، دانشکده مهندسی مواد و متالورژی، دانشگاه صنعتی امیرکبیر، تهران، ایران
3 استاد، پژوهشکده فناوری نانو و مواد پیشرفته، پژوهشگاه مواد و انرژی، کرج، ایران
چکیده
آلیاژهای تیتانیم و به‌ویژه Ti-6Al-4V کاربرد وسیعی در زیست‌پزشکی و ساخت کاشتنی‌ها دارند. همچنین تلاش‌های زیادی می‌شود تا با پوشش دادن این آلیاژ با هیدروکسی آپاتیت به عنوان یک ماده زیست سازگار، خواص مطلوب‌تری از نظر استخوان زایی و یکپارچگی بیشترکاشتنی با بافت زمینه حاصل شود. از سوی دیگر خواص مکانیکی پوشش به‌دست آمده نیز از اهمیت زیادی برخوردار بوده و هرچه به خواص استخوان نزدیک‌تر باشد، مطلوب‌تر خواهد بود. یکی از روش‌های نوین برای تعیین خواص مکانیکی لایه های نازک و پوششها نانوفروروندگی است که مورد توجه محققین می‌باشد. دراین پژوهش پوشش‌های کامپوزیتی و مرتبه‌ای حاوی HA/Ti بر روی زیرلایه آلیاژ Ti-6Al-4V به‌روش پوشش دهی مکانیکی اعمال شده وساختار میکروسکوپی سطح مقطع آنها با میکروسکوپ الکترونی روبشی SEM وخواص مکانیکی آنها شامل مدول الاستیک و سختی با روش نانو فروروندگی تعیین و مقایسه گردید. نتایج حاکی از آن بود که مدول الاستیک و سختی در پوشش مرتبه ای (مدول 4.7 ± 36.6 و سختی 0.94 گیگاپاسکال) بیشتر از پوشش کامپوزیتی (مدول 8.5 ± 13.3 و سختی 0.26 گیگاپاسکال) بوده و از یکنواختی بسیار بیشتری برخوردار است. علت این موضوع با توجه به تصاویر SEM سطح مقطع پوششها، به تخلخل بیشتر و ناصافی سطح پوشش کامپوزیتی غیرگرادیانی مربوط می‌باشد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Effect of Graded Coating on the Nanoindentation Properties of HA/Ti Composite Coatings Synthesized by Mechanical Coating Technique on Ti-6Al-4V Substrate
نویسندگان [English]
- Mahmood Jalali Bidakhavidi 1
- Hamid Omidvar 2
- Ali Zamanian 3
1 PhD candidate, Department of Materials and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
2 Associate Professor, Department of Materials and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic),Tehran, Iran
3 Professor, Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, Karaj, Iran
چکیده [English]
Titanium alloys, notably Ti-6Al-4V, are widely used in biomedical and implant manufacturing. Further, many efforts are made to coat this alloy with hydroxyapatite as a biocompatible ceramic material, to obtain more favorable properties in terms of osteogenesis and greater integration of the implant with the host tissue. Moreover, the mechanical properties of the coating are very important and the closer it is to the properties of bone, the more desirable it will be. One of the new methods for determining the mechanical properties of thin layers and coatings is nanoindentation, which is of interest to researchers. In this research, composite and graded coatings containing HA/Ti were deposited on Ti-6Al-4V substrate by mechanical coating technique and their cross-sectional structure was determined and compared by scanning electron microscope (SEM). Their mechanical properties including elastic modulus and hardness were also studied by nanoindentation method. The results indicated that the elastic modulus and hardness of the graded coating (modulus 36.6 ± 4.7 and hardness 0.94 GPa) is higher and more uniform than the composite coating (modulus 13.3 ± 8.5 and hardness 0.26 GPa). According to the SEM images of the cross-section of the coatings, the reason is greater porosity and roughness of the non-graded composite coating.
کلیدواژه‌ها [English]
- Mechanical Coating Technique (MCT)
- Hydroxyapatite (HA)
- Ti-6Al-4V Alloy
- Functionally Graded Coating (FGC)
- Nanoindentation
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