بررسی رفتار خوردگی ایمپلنت Ti-6Al-4V پوشش داده شده با نانولایه تانتالوم برای کاربردهای پزشکی

مهندسی متالورژی و مواد

مقاله 4، دوره 27، شماره 2 - شماره پیاپی 14، شهریور 1395، صفحه 47-58   

نوع مقاله: علمی و پژوهشی

شناسه دیجیتال (DOI): 10.22067/ma.v27i2.30271

نویسندگان

محبوبه محمودی^{* 1}؛ پیمان محمودی هاشمی²؛ آرمان زارع بیدکی³

¹دانشگاه آزاد واحد یزد و داننشگاه علوم و تحقیقات یزد

²دانشگاه علوم و تحقیقات یزد

³دانشگاه آزاد واحد یزد

چکیده

در این تحقیق نانولایه تانتالوم با ضخامت nm200 به روش رسوب فیزیکی بخار (PVD) با پرتو الکترونی بر روی سطح زیرلایه Ti-6Al-4V به منظور بهبود خواص سطحی و خوردگی پوشش داده شد. میزان سختی و زبری سطح نمونه های بدون پوشش (Ti-6Al-4V) و نمونه های با پوشش تانتالوم (Ti-6Al-4V/Ta) تحت ارزیابی قرار گرفتند. سختی و زبری سطح نمونه ها پس از پوشش دهی نسبت به نمونه شاهد
(Ti-6Al-4V) به ترتیب از HV345 به HV371 و از µm055/0 به µm107/0 افزایش یافت. همچنین با انجام آزمون خوردگی در محلول فیزیولوژیکی هنک مشاهده گردید که چگالی جریان خوردگی در نمونه های Ti-6Al-4V/Ta در مقایسه با نمونه شاهد از μA/cm^2 9/1 به μA/cm^2 7/0 کاهش می یابد که بیانگر بهبود قابل توجه مقاومت به خوردگی تا دو برابر می باشد. پس از آزمون خوردگی با بررسی میزان رهایش یون های V، Al و Ti، غلظت عناصر آزاد شده پس از پوشش دهی به نصف میزان آن ها در قبل از پوشش دهی کاهش می یابد. نهایتاً، آزمون های پراش اشعه ایکس(XRD)، بررسی های میکروسکوپ الکترونی روبشی (SEM) و آنالیز عنصری (EDS) به ترتیب برای شناسایی فازها، بررسی مورفولوژی و تعیین در صد عناصر نمونه ها انجام گردید. نتایج نشان دادند که آلیاژ Ti-6Al-4V پوشش داده شده با تانتالوم با توجه به مقاومت خوردگی و خواص مکانیکی عالی گزینه مناسبی برای کاربرد در ایمپلنت های دندانپزشکی و ارتوپدی می باشد.

کلیدواژه‌ها

تانتالوم؛ Ti-6Al-4V؛ پرتو الکترونی؛ رسوب فیزیکی بخار (PVD)؛ مقاومت به خوردگی؛ زیست سازگاری؛ پوشش دهی

سایر فایل های مرتبط با مقاله

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