تولید، مشخصه‌یابی ساختاری و ارزیابی خواص مغناطیسی پوشش‌های نانوساختار آهن- کبالت- تنگستن تهیه شده به روش آبکاری الکتریکی

فصلنامه علمی - پژوهشی مواد نوین

مقاله 4، دوره 7، شماره 25، مهر و آبان 1395، صفحه 31-44   

نوع مقاله: مقاله پژوهشی

نویسندگان

زهرا غافری^{* 1}؛ شهریار شرفی²؛ محمد ابراهیم بحرالعلوم³

¹دانشجوی دکترای مهندسی مواد دانشگاه شهید باهنر کرمان

²استاد بخش مهندسی مواد دانشگاه شهید باهنر کرمان

³استاد بخش مهندسی مواد دانشگاه شیراز

تاریخ دریافت: 18 مهر 1395،  تاریخ پذیرش: 18 مهر 1395 

چکیده

در این تحقیق پوشش­های نانوساختار آهن-کبالت-تنگستن به روش آبکاری جریان مستقیم بر روی زیر لایه مسی حاصل شد. نتایج نشان داد که چگالی جریان پوشش­دهی و نیز ترکیب شیمیایی محلول بر خواص مغناطیسی و ساختاری اثرگذار است. مورفولوژی پوشش­های بدست آمده از دو حمام آبکاری متفاوت بوده و با افزایش چگالی جریان آبکاری مقدار فاز fcc موجود در ساختار دو فازی fcc+bcc کاهش یافت. مشاهده شد که پارامترهای آبکاری تاثیر چشمگیری بر روی تغییرات اندازه دانه نداشته و اندازه دانه پوشش­ها کمتر از 20 نانومتر گزارش شد. با افزایش چگالی جریان، رسوب­دهی تحت کنترل نفوذ درآمده و مقدار تنگستن رسوب­کرده و در نتیجه میکروسختی پوشش­ها کاهش یافت. با توجه به نتایج حاصل از پراش پرتو ایکس (XRD) و نیز مغناطش سنج نمونه لرزان  (VSM)می­توان تغییرات گسترده در مقدار وادارندگی را به تغییرات فازی در این پوشش­ها مربوط دانست.

کلیدواژه‌ها

خاصیت مغناطیسی؛ آبکاری الکتریکی؛ نانوساختار؛ آهن-کبالت-تنگستن

عنوان مقاله [English]

Fabrication, Structural Characterization and Magnetic Properties of Nanostructure Fe-Co-W Coatings Prepared by Electrodeposition

نویسندگان [English]

Z. Ghaferi¹؛ S. Sharafi²؛ M. E. Bahrololoom³

چکیده [English]

In this research, nanocrystalline FeCoW alloy coatings were electrodeposited on copper substrate. The results showed that current density and bath composition can affect structural and magnetic properties. However, surface morphology changed due to bath composition. Furthermore, by increasing current density, the amount of fcc phase decreased in fcc+bcc double phase structure. It was observed that deposition parameters didn’t change the grain size of the coatings efficiently, and this parameter was lower than 20 nm for all the cases. Due to the diffusional phenomenon that take places at higher current densities, the amount of deposited tungsten decreased, and thus lower microhardness values were reported. By comparing XRD and VSM data, it was assumed that the extensive change in the coercivity is related to the phase structure in these alloys.

کلیدواژه‌ها [English]

Magnetic property, Electrodeposition, Nanostructure, Fe−Co−W

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