بررسی اثر حضور آلومینیوم اضافی در مخلوط پودری TiO2-Al و نوع ماده جاذب در ساخت ریزموجی کامپوزیت TiAl/Al2O3

نویسندگان

دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران

چکیده

در این پژوهش کامپوزیت  TiAl/Al2O3به­روش فعال­سازی مکانیکی مخلوط پودری TiO2-Al و گرمایش ریزموجی (مایکروویو) به‌دست آمد. مخلوط پودری اولیه به‌همراه مقادیر مختلف آلومینیوم اضافی آسیاب‌کاری و پس از فشرده­سازی به‌شکل قرص­های استوانه­ای، تحت گرمایش ریزموجی قرار گرفت. اثر میزان آلومینیوم اضافی و هم‌چنین نوع ماده کمکی جاذب امواج ریزموج (گرافیت و کاربید سیلیسیم) بر زمان اشتعال نمونه‌ها و ترکیب فازی کامپوزیت ساخته­شده مورد بررسی قرار گرفت. از تحلیل‌های XRD و SEM برای بررسی محصولات ساخته شده استفاده شد. نتایج تحلیل­های فازی نشان داد که بدون حضور آلومینیوم اضافی در مخلوط پودری اولیه، فاز TiAl به‌مقدار بسیار کم تشکیل می‌شود و به‌جای آن فاز Ti3Al شکل می­گیرد، در حالی­که با حضور 10 درصد وزنی آلومینیوم اضافی، می­توان به فاز TiAl دست یافت. هم‌چنین نتایج نشان داد که دفن کردن قرص نمونه در پودر گرافیت نسبت به­قرار دادن آن میان دو بلوک کاربید سیلیسیم، موجب ساخت سریع­تر کامپوزیت با تکرارپذیری بالاتر می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Excess Al in TiO2-Al Powder Mixture and Susceptor Material on Microwave Synthesis of TiAl/Al2O3 Composite

نویسندگان [English]

  • P. Radmehr
  • A. Zakeri
  • S. Alamolhoda
Department of Metallurgical and Materials Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

In this research, TiAl/Al2O3 composite was synthesized from mechanically activated TiO2-Al powder mixtures using microwave heating.The initial powder mixtures were mechanically activated and pressed into cylindrical tablets and then heated in a microwave oven. The effect of different amounts of excess Al and microwave susceptor material (SiC or graphite) on the ignition time and the resultant reaction products were evaluated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis were used for characterization of the synthesized samples. XRD patterns revealed that when there was no excess Al in the initial powder mixture, the main resulting intermetallic phase would be Ti3Al with negligible amounts of TiAl, while with 10 wt% excess Al, TiAl phase could be formed in the composite product.The results also showed that microwave synthesis took place faster and more reproducible when samples were packed in the graphite powder than when placed between two SiC blocks.

کلیدواژه‌ها [English]

  • Titanium Aluminide-Alumina composite
  • Combustion synthesis
  • Microwave heating
  • Microwave susceptor
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