تولید، مشخصه‌یابی ساختاری و ارزیابی خواص مغناطیسی پوششهای نانوساختار آهن- کبالت- تنگستن تهیه شده به روش آبکاری الکتریکی
الموضوعات : 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
الکلمات المفتاحية: نانوساختار, آبکاری الکتریکی, خاصیت مغناطیسی, آهن-کبالت-تنگستن,
ملخص المقالة :
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.
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