طراحی ترکیب شیمیایی یک نوع پوشش از آلیاژ چند جزئی بر پایه زیرکونیوم با ساختار شیشه‌ای بر روی زیر لایه فولاد زنگ نزن ۳۱۶ به روش مگنترون اسپاترینگ

محورهای موضوعی : روش ها و فرآیندهای نوین در تولید

حسین شفیعی ^{1 *} , امیر سیف‌الدینی ² , سعید حسنی ³ , علی عبیداوی ⁴

1 - دانشکده مهندسی معدن و متالورژی، دانشگاه یزد.
2 - دانشکده مهندسی معدن و متالورژی، دانشگاه یزد.
3 - دانشکده مهندسی معدن و متالورژی، دانشگاه یزد.
4 - دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان.

تاریخ دریافت : 1403/05/03 تاریخ پذیرش : 1403/06/10 تاریخ انتشار : 1404/02/10

کلید واژه: لایه‌ نازک شیشه‌های فلزی فولاد زنگ نزن ۳۱۶ ساختار آمورف,

چکیده مقاله :

اعمال پوشش‌هایی با ساختار آمورف بر روی ابزارها و تجهیزات پزشکی می‌تواند باعث بهبود رفتار زیست سازگاری آنها گردد. یکی از این پوشش‌ها، پوشش‌های لایه‌نازک شیشه فلزی پایه زیرکونیوم می‌باشد. هدف از انجام این پژوهش طراحی یک آلیاژ جدید هفت جزئی با ساختار شیشه‌ای بر پایه زیرکونیوم و اعمال آن بر روی فولاد زنگ نزن ۳۱۶ (مورداستفاده برای ابزارهای جراحی) می‌باشد. مطالعات نشان می‌دهد عناصری همچون مس و نقره و حتی آلومینیوم در این ساختار شیشه‌ای باعث ایجاد خاصیت آنتی باکتریال، کروم باعث افرایش مقاومت به خوردگی و سیلیسیم و بور باعث افزایش تمایل به آمورف شدن ساختار می‌گردند. پس از بررسی‌های ترمودینامیکی در زمینه پیش‌بینی امکان آمورف شدن ساختار و کاهش احتمال تشکیل هرگونه فاز کریستالی در پوشش ایجاد شده و محاسبه فاکتور عدم تطابق، ابتدا آلیاژی با ترکیب شیمیایی Zr₃₀Cu₂₀Al₁₀Ag₁₀Cr₁₀Si₁₀Br₁₀ طراحی شد. در مرحله بعد عناصر موردنظر با نسبت استوکیومتری لازم، توزین و سپس با استفاده از یک آسیاب گلوله­ای با همدیگر مخلوط شدند. سپس با استفاده از دستگاه تف جوشی به کمک قوس پلاسما،SPS، تارگتی با ترکیب شیمیایی موردنظر تولید شد. در ادامه با بکار گیری تارگت تولید شده در دستگاه پوشش دهی نوع کندو پاش (مگنترون اسپاترینگ)، لایه‌های نازکی از آلیاژ مذکور با دو ضخامت مختلف بر روی زیر لایه فولاد ۳۱۶ ایجاد شدند. بررسی‌های انجام شده حاکی از موفقیت‌آمیز بودن آلیاژ طراحی شده در حصول به یک ساختار کاملاً آمورف می‌باشد. علاوه بر عدم وجود ساختار کریستالی، یکنواختی پوشش، همگن بودن ترکیب شیمیایی در نقاط مختلف، پیوستگی بسیار خوب با زیر لایه از دیگر ویژگی‌های پوشش تولید شده می‌باشد. لذا می‌توان گفت اعمال آن بر روی ابزارهای فولادی بیو پزشکی می‌تواند باعث افزایش رفتار زیست سازگاری آنها گردد.

چکیده انگلیسی:

Applying coatings with amorphous structure on medical tools can improve their biocompatibility behavior. One of these coatings is Zr-based thin film metal glass coatings. The purpose of this research is to design a novel seven-component alloy with a Zr-based glass structure and apply it to 316 stainless steel (used for surgical instruments). Studies show that elements such as copper, silver and even aluminum in this glass structure create antibacterial properties, Cr increases corrosion resistance, and silica and boron increase the tendency of the structure to become amorphous. After thermodynamic investigations in predicting the possibility of amorphous structure and reducing the possibility of forming any crystalline phase in the coating and calculation of the misfit factor, first an alloy with the chemical composition of Zr₃₀Cu₂₀Al₁₀Ag₁₀Cr₁₀Si₁₀Br₁₀was designed. The elements were weighed with the required stoichiometric ratio, and then they were mixed using a mechanical ball mill. Then, using SPS, Spark Plasma Sintering system, a target with the desired chemical composition was produced. Next, by using the target produced in a Magnetron Sputtering coating machine, thin layers of the alloy with two different thicknesses were applied on the 316 steel substrate. The investigations carried out indicate the success in obtaining a completely amorphous structure. In addition to the absence of any crystalline structure, the uniformity of the coating, the homogeneity of the chemical composition, a very good connection with the substrate are other characteristics of the produced coating. Therefore, it can be said that its application on biomedical steel tools can increase their biocompatibility behavior.

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