تولید، مشخصه‌یابی ساختاری و ارزیابی خواص مغناطیسی پوششهای نانوساختار آهن- کبالت- تنگستن تهیه شده به روش آبکاری الکتریکی
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوینزهرا غافری 1 , شهریار شرفی 2 , محمد ابراهیم بحرالعلوم 3
1 - دانشجوی دکترای مهندسی مواد دانشگاه شهید باهنر کرمان
2 - استاد بخش مهندسی مواد دانشگاه شهید باهنر کرمان
3 - استاد بخش مهندسی مواد دانشگاه شیراز
کلید واژه: نانوساختار, آبکاری الکتریکی, خاصیت مغناطیسی, آهن-کبالت-تنگستن,
چکیده مقاله :
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.
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.
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