اثر افزودن سیلیسیم بر رفتار مکانیکی و خوردگی پوشش کاربید تانتالم تولید شده به روش کندوپاش مگنترونی

محورهای موضوعی : خوردگی و حفاظت مواد

علیرضا حسینی ¹ , میناسادات امامیان ² , مصطفی علیشاهی ³

1 - عضو هیئت علمی/گروه مهندسی مواد و پلیمر، دانشکده فنی و مهندسی، دانشگاه حکیم سبزواری
2 - گروه مهندسی مواد و پلیمر، دانشکده فنی و مهندسی، دانشگاه حکیم سبزواری، سبزوار، ایران
3 - دانشگاه حکیم سبزواری

تاریخ دریافت : 1400/11/24 تاریخ پذیرش : 1400/02/20 تاریخ انتشار : 1401/10/01

کلید واژه: پوشش, سختی, خوردگی, کندوپاش مگنترونی, تانتالم,

چکیده مقاله :

در این پژوهش پوشش‌های Ta، TaC و TaSiC به روش کندوپاش مگنترونی غیرواکنشی لایه‌نشانی شده و خواص ساختاری، ریزساختاری، مکانیکی و خوردگی بررسی شده است. نتایج XRD نشان دادند که پوشش Ta ساختار کریستالی تانتالم α، پوشش TaC ساختار کریستالی TaC0.6 و پوشش TaSiC ماهیت شبه‌آمورف از خود نشان دادند. در این ارتباط، پوشش Ta ریزساختاری ستونی با زبری بالا و تنش پسماند کششی از خود نشان داد، در حالی‌که افزودن کربن و سیلیسیم به پوشش سبب فشرده‌شدن ریزساختار، کاهش زبری سطح و تغییر ماهیت تنش پسماند از کششی به فشاری شد. همچنین نتایج آزمون نانوفرورونده نشان داد که افزودن کربن به پوشش تانتالم باعث افزایش حدود چهار برابری سختی پوشش می‌شود، ولی افزودن سیلیسیم به پوشش TaC سختی پوشش را اندکی کاهش می‌دهد. مطالعات خوردگی نشان داد همه پوشش‌ها نسبت به زیرلایه ST37 ماهیتی کاتدی از خود نشان دادند که می‌تواند منجر به خوردگی گالوانیک شود. علاوه بر این نتایج خوردگی نشان داد که پوشش Ta بازده حفاظتی به میزان ٪9/78 برای فولاد ساده کربنی را به همراه دارد و افزودن کربن و سیلیسیم به پوشش سبب افزایش بازده حفاظتی به مقادیر ٪1/90 و ٪5/95 به ترتیب برای پوشش‌های TaC و TaSiC می‌شود .در این ارتباط نقش این عناصر در فشردگی پوشش و کاهش مسیرهایی که محلول خورنده می‌تواند به زیرلایه برسد، کلیدی تشخیص داده شد.

چکیده انگلیسی:

In this study, Ta, TaC and TaSiC coatings have been deposited by a non-reactive magnetron sputtering method, and their structural, microstructural, mechanical, and corrosion properties have been investigated. XRD results revealed the presence of α-Ta and TaC0.6 phase structures in the Ta and TaC coatings, respectively. However, the TaSiC coating showed a quasi-amorphous structure. Additionally, the Ta coating showed a columnar microstructure with rough topography and tensile residual stress, while the addition of carbon and silicon resulted in the compactness and smoothness and domination compressive residual stress in the TaC and TaSiC coatings. Nanoindentation results showed that the addition of carbon to the Ta coating increased the hardness by four times, however the addition of silicon to the TaC coating had an adverse effect on the hardness of the coating. The corrosion studies revealed that the coatings have a cathodic nature with respect to the ST37 substrate, making the samples susceptible to galvanic corrosion. Furthermore, the addition of carbon and silicon was found to improve the corrosion resistance of the coatings by increasing the coating compactness and decreasing the density of open porosities.

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