نوع مقاله: مقاله کامل پژوهشی

نویسندگان

1 دانشجوی دکتری مهندسی مواد، مرکز تحقیقات مواد پیشرفته و فرآوری مواد معدنی، دانشکده مهندسی مواد، دانشگاه صنعتی سهند

2 دانشیار، مرکز تحقیقات مواد پیشرفته و فرآوری مواد معدنی، دانشکده مهندسی مواد، دانشگاه صنعتی سهند

3 دانش‌آموختة کارشناسی ارشد مهندسی شناسایی و انتخاب مواد مهندسی،مرکز تحقیقات مواد پیشرفته و فرآوری مواد معدنی، دانشکده مهندسی مواد، دانشگاه صنعتی سهند

10.22041/ijbme.2012.13119

چکیده

در این پژوهش، پوشش کامپوزیتی هیدروکسی‌آپاتیت/ نانولولة کربنی با استفاده از رسوب‌دهی الکتروفورتیک بر روی آلیاژ NiTiدر دمای اتاق تشکیل شد. سوسپانسیون پایدار با اضافه کردن 4 گرم پودر هیدروکسی‌آپاتیت و 1 درصد وزنی نانولولة کربنی به 50 میلی‌لیتر n- بوتانول آماده شد. از تری اتیلن آمین نیز به عنوان پراکنده‌ساز در تهیه سوسپانسیون استفاده شد. مشخصه‌یابی سطحی، استحکام چسبندگی، پایداری و زیست‌فعالی پوشش کامپوزیتی بررسی شدند.  نتایج آزمون EDXسطح پوشش کامپوزیتی، توزیع یکنواخت نانولولة کربنی را در سرتاسر پوشش نشان می‌دهد. همچنین استحکام چسبندگی پوشش کامپوزیتی MPa24 اندازه‌‌گیری شد. نمودارهای بد و نایکوئیست نشان می‌دهند که پایداری شیمیایی نمونه‌های دارای پوشش کامپوزیتی بیشتر از پوشش هیدروکسی‌آپاتیت خالص و نمونه بدون پوشش است. پوشش کامپوزیتی مقاومت خوردگی زیرلایه NiTiرا بیشتر از پوشش هیدروکسی‌آپاتیت خالص افزایش می‌دهد. آزمون زیست فعالی برون تنی در محلول SBFنشان می‌دهد که حضور نانولولة کربنی در پوشش کامپوزیتی تأثیر منفی در توانایی شکل‌گیری و رشد آپاتیت ندارد.  

کلیدواژه‌ها

عنوان مقاله [English]

Bioactive HA/CNTs composite Coatings on the NiTi implants

نویسندگان [English]

  • Vida Khalili 1
  • Jafar Khalil Allafi 2
  • Hosein Maleki Ghaleh 3

1 Ph.D Student, Research Center for Advanced Materials and Mineral Processing, Faculty of Materials Engineering, Sahand University of Technology

2 Associate Professor, Research Center for Advanced Materials and Mineral Processing, Faculty of Materials Engineering

3 M.Sc, Research Center for Advanced Materials and Mineral Processing, Faculty of Materials Engineering

چکیده [English]

In this study, a hydroxyapatite/carbon nanotubes composite was coated at room temperature on NiTi shape memory alloy (SMA) through electrochemical deposition using stable suspension which was prepared by adding 4 g natural hydroxyapatite powder and 1 wt. % CNTs to 50 ml n-butanol. Suspension was stabilized using triethylenamine as dispersant. Surface characteristics, adhesion strength, stability and bioactivity of the composite coating were subsequently studied. EDX examination of the composite coating surface revealed homogeneous dispersion of carbon nanotubes all over coating. Also, the bonding strength of composite coating was found to be about 24 MPa. Compared to NiTi sample coated with hydroxyapatite and coated with hydroxyapatite/carbon nanotubes, the bode and nyquist plots of NiTi samples with hydroxyapatite/carbon nanotubes composite coating suggested that the composite coating was chemically more stable and provided corrosion resistance for NiTi SMA. In-vitro bioactivity test in SBF showed that the presence of CNTs in HA/CNTs composite coating does not have negative effect on ability of apatite formation.

کلیدواژه‌ها [English]

  • composite coating
  • Hydroxyapatite
  • NiTi substrate
  • Carbon nanotubes
  • electrophoretic deposition

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