بررسی خواص پوشش MoS2-Cr ایجاد شده توسط فرایند پراکنش مگنترونی DC

نویسندگان

1 1. دانشکده مهندسی مواد و متالوژی، دانشگاه شهید باهنر کرمان

2 2. دانشکده مهندسی مواد، دانشگاه تربیت مدرس

چکیده

- دی سولفید مولیبدن (MoS2) یکی از رایج‌ترین پوشش‌های روانکار جامد است. در این تحقیق پوشش­‌های کامپوزیتی MoS2-Cr به‌روش کندوپاش مغناطیسی جریان مستقیم، روی فولاد AISI1045 عمال شد. نسبت کروم در پوشش با استفاده از تارگت‌های مختلف کنترل شد. پوشش‌ها با استفاده از پراش پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی (SEM)، طیف‌سنجی پراش انرژی پرتو ایکس (EDX) و نانوفرورونده و نانوخراش مشخصه‌یابی شد. نتایج نشان داد که ضخامت و سختی پوشش‌های ایجاد شده به‌ترتیب 6 میکرومتر و 1300-850 ویکرز بود. حضور کروم در پوشش MoSx باعث بهبود چسبندگی و افزایش سختی پوشش می‌شود. میزان بلورینگی ساختار با افزایش میزان کروم کاهش می‌یابد. مقدار بهینه افزودن کروم برای ایجاد بهترین خواص سایشی پوشش‌های MoS2-Cr، 13 درصد اتمی تعیین شد. سایش ورقه‌ای و تریبوشیمی و خراشان با مکانیزم خیش ریز به‌عنوان مهم‌ترین مکانیزم‌های حاکم در سایش پوشش تعیین شد.

کلیدواژه‌ها


عنوان مقاله [English]

An Investigation Into the Properties of MoS2-Cr Coatings Produced by DC Magnetron Sputtering

نویسندگان [English]

  • M. Akbarzadeh 1
  • M. Zandrahimi 1
  • E. Moradpour 2
چکیده [English]

Molybdenum disulfide (MoS2) is one of the most widely used solid lubricants. In this study, MoS2-Cr composite coatings were deposited onto AISI 1045 steel substrates by direct-current magnetron sputtering. The MoS2/Cr ratio in the coatings was controlled by sputtering the composite targets. The coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and nano-indentation and nano-scratch techniques. The tribological behavior of the coatings was investigated using the pin-on-disc test at room temperature. The results showed that the thickness and the hardness of the coating were 6 µmand 850-1300 HV, respectively. The degree of the crystallization of the composite coatings was enhanced with increasing the Cr contents. The incorporation of Cr into MoSx coatings resulted in the considerable improvement of coating adhesion and hardness. The optimum doping level for MoS2-Cr coatings to show the best tribological propertie was 13 atomic percent. The main wear mechanisms of the coating were delamination, tribochemical and abrasive micro cracking

کلیدواژه‌ها [English]

  • Molybdenum disulfide
  • Solid lubricant coating
  • Physical vapor deposition. Wear behavior
  • Friction coefficient
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