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

نوع مقاله : علمی و پژوهشی

نویسندگان

• محبوبه محمودی ¹
• پیمان محمودی هاشمی ²
• آرمان زارع بیدکی ³

¹ دانشگاه آزاد واحد یزد و داننشگاه علوم و تحقیقات یزد

² دانشگاه علوم و تحقیقات یزد

³ دانشگاه آزاد واحد یزد

10.22067/ma.v27i2.30271

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

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عنوان مقاله [English]

Corrosion Behavior of Ti-6Al-4V Implant Coated with a Tantalum Nanolayer for Medical Applications

نویسندگان [English]

• mahboobeh mahmoodi ¹
• Peyman Mahmoodi Hashemi ²
• Arman Zare Bidaki ³

¹ Yazd Branch, Islamic Azad University, Yazd, Iran.

² Yazd Branch, Islamic Azad University, Yazd, Iran

³ Yazd Branch, Islamic Azad University, Yazd, Iran.

چکیده [English]

In this study, Ti-6A1-4V alloy was coated with a 200 nm thick tantalum nanolayer using physical vapor deposition method with electron beam in order to improve its surface and corrosion properties. The surface hardness and roughness of the control sample (Ti-6A1-4V) and those with tantalum coating (Ti-6Al-4V/Ta) were assessed. After coating, the surface hardness and roughness of the samples increased from 345 HV to 371 HV and from 0.055 µm to 0.107 µm, respectively. Moreover, the corrosion test in Hank's solution revealed that the corrosion current density of Ti-6Al-4V/Ta decreased from 1.9 µA/cm2 vs. 0.7 µA/cm2 for control sample. Following the corrosion test, the release rate of V, Al and Ti ions was examined. The results showed that the concentration of the released elements was halved after coating. Finally, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDS) were conducted to determine the phases, microstructures, and percentage of elements in the samples, respectively. The test results indicated that tantalum-coated Ti-6A1-4V alloy has desirable corrosion resistance and excellent mechanical properties and can thus be employed in dental and orthopedic implants.

کلیدواژه‌ها [English]

• Tantalum
• Ti-6A1-4V
• Electron Beam
• Physical Vapor Deposition
• Corrosion Resistance
• Biocompatibility
• Coating

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