IJE TRANSACTIONS B: Applications Vol. 31, No. 5 (May 2018) 792-798    Article in Press

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M. Akbarzadeh, M.Zandrahimi and E. Moradpour
( Received: October 03, 2017 – Accepted in Revised Form: April 01, 2018 )

Abstract    In this investigation, MoSx/Cr coatings were deposited by direct-current magnetron sputter onto Ck45 (AISI 1045) plain carbon steel substrates. The MoSx/Cr ratio in the coatings was controlled by sputtering the composite targets. The chemical characterization was performed using EDX (energy dispersive X-ray analysis); the structural characterization was accomplished by X-ray diffraction (XRD) studies. The mechanical properties of coatings were analyzed by nanoindentation experiments. The tribological behavior of the coatings was investigated using the pin on disc test at room temperature. MoSx/Cr coatings with Cr atomic percentage of 13% was found to possess the optimum wear resistance and durability. The MoSx/Cr coatings showed a maximum hardness of 12.5 GPa at a dopant content of 13 at.% Cr. Moreover, the films exhibited a steady state friction coefficient from 0.15 to 0.19 and the main wear mechanisms of the MoSx/Cr coating in air were abrasive, adhesive, and oxidation.


Keywords    MoSX/Cr coating; PVD; Tribological properties; Low Friction; Solid Lubricant.


چکیده    در این تحقیق پوشش­های MoSx/Cr به روش کندوپاش مغناطیسی جریان مستقیم روی زیرلایه فولاد کربنی سادهCk45 (AISI 1045)رسوب گردید. نسبت MoSx/Cr در پوشش­ها با تغییر ترکیب ماده­های هدف کنترل گردید. .ترکیب شیمایی پوشش‌ها با استفاده از طیف‌سنجی پراش انرژی پرتوایکس (EDX) و ساختار فازی با استفاده از پراش پرتوایکس(XRD)بررسی شد. با استفاده از آزمون نانو فرورونده خواص مکانیکی پوشش­ها مورد بررسی قرار گرفت. رفتار تریبولوژی پوشش با استفاده از آزمون پین روی دیسک در دمای اتاق ارزیابی شد. نتایج نشان داد که بالاترین پایداری و مقاومت سایشی با افزودنکروم به میزان 13 درصد حاصل می‌گردد. بالاترین میزان سختی پوشش با افزودن کروم به میزان 13 درصد اتمی ایجاد گردید. مقدار ضریب اصطکاک پوشش­ها از 15/0 تا 19/0 متغیر بود و سايش خراشان، چسبان و اکسیداسیون به‌عنوان مهم‌ترين مکانیزم­های حاکم بر سايش پوشش MoSx/Cr تعیین شد.


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