بررسی تأثیر فعال سازی مکانیکی و سرعت گرمایش بر تشکیل کامپوزیت نانوساختار NiAl-Al2O3 به روش سنتز احتراقی

محورهای موضوعی : سنتز مواد

مریم بیهقی ¹ ( عضو هیات علمی )

تاریخ دریافت : 1396/03/28 تاریخ پذیرش : 1396/06/21 تاریخ انتشار : 1396/06/01

کلید واژه: کامپوزیت, سنتز احتراقی, مواد نانوساختار, NiAl, Al2O3,

چکیده مقاله :

در این مقاله، تأثیر فعال‌سازی مکانیکی و سرعت افزایش دما (20 و °C/min40) بر رخداد واکنش‌ها در فرآیند سنتز کامپوزیت نانوساختار NiAl/Al2O3 از مخلوط پودری Ni، NiO و Al در گرمایش از 20 تا °C1300 مورد بررسی قرارگرفت. برای بررسی واکنش‌های رخ دهنده در نمونه‌ها، آنالیز دیفرانسیلی حرارتی، پراش سنجی اشعه ایکس و میکروسکوپی الکترونی روبشی انجام شد. در گرمایش نمونه‌های پودری بدون فعال‌سازی، واکنش گرمازای احیای NiO با Al و تشکیل فازهای Ni-Al در حضور آلومینیم مذاب رخ داد، درحالی‌که در اثر فعال‌سازی مکانیکی این واکنش‌ها در حالت جامد و در دمای پایین‌تر و به صورت مجزا از هم اتفاق افتاد. با کاهش سرعت گرمایش، واکنش‌ها در دمای پایین‌تر و به صورت تفکیک شده انجام شد. مکانیزم پیشنهادی برای رخداد واکنش‌ها در حین گرمایش پودر فعال‌سازی مکانیکی شده مطرح شد. واژه‌های کلیدی: کامپوزیت، مواد نانوساختار، سنتز احتراقی، NiAl، Al2O3، فعال‌سازی مکانیکی، آسیاکاری مکانیکی، نرخ گرمایش

چکیده انگلیسی:

Investigation of influences of mechanical activation and heating rate on nanostructured NiAl-Al2O3 composites formation by combustion synthesis Abstract The paper investigates influence of mechanical activation and heating rate (20°C/min and 40°C/min) on reactions occurrence in combustion synthesis process of nanostructured NiAl-Al2O3 composites by heating of Ni, NiO and Al powder mixture from 20°C to 1300°C. To study reactions occurrence, differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized. By heating the sample without mechanical activation, exothermic reaction of NiO reduction by Al and Ni-Al intermetallic phases production happened in the presence of molten Al; while mechanical activation caused occurrence of these reactions at lower temperatures and separately. By decrement in heating rate, reactions happened separately at lower temperatures. A mechanism for reactions occurrence during heating of mechanically activated sample is proposed. Keywords Composite, Nanostructured Materials, Combustion Synthesis, NiAl, Al2O3, Mechanical Activation, Mechanical Milling, Heating Rate

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