بررسی اثر شدت فعال‌سازی مخلوط پودری TiO2-Al در سنتز مایکروویوی کامپوزیت TiAl/Al2O3

نوع مقاله : علمی و پژوهشی

نویسندگان

1 دانشگاه علم وصنعت ایرن

2 دانشگاه علم و صنعت ایران

3 دانشگاه علم وصنعت ایران

چکیده

در این تحقیق کامپوزیت TiAl/Al2O3 از طریق فعال‌سازی مکانیکی مخلوط پودری TiO2-Al و گرمایش مایکروویوی بدست آمد. مخلوط پودری اولیه پس از آسیاکاری به صورت قرص‌های استوانه‌ای شکل فشرده شد و سپس تحت گرمادهی مایکروویو قرار گرفت. از آنالیزهای پراش پرتو ایکس و میکروسکوپ الکترونی جهت بررسی ساختاری نمونه‌ها پس از سنتز استفاده شد. اثر شدت فعال‌سازی بر زمان اشتعال نمونه‌ها و ترکیب فازی کامپوزیت سنتز شده مورد بررسی قرار گرفت. همچنین درصد حجمی فازهای تشکیل شده با استفاده از الگوی پراش پرتو ایکس و نرم‌افزار محاسبه شد. نتایج تشکیل محصول کامپوزیتی و حضور فاز TiAl و ذرات آلومینا را تأیید کرد. فاز غالب تشکیل شده در نمونه‌ها آلومینا با مقدار حدود 75-65 درصد حجمی و مقدار ترکیب بین‌فلزی تیتانیم آلومیناید بین 30-18 درصد حجمی متغیر بود. همچنین معلوم شد که افزایش شدت فعال‌سازی زمان اشتعال را ابتدا کاهش و سپس افزایش می‌دهد. در شرایط بهینه با زمان اشتعال 27 ثانیه، محصول کامپوزیتی از ساختار یکنواخت‌تر و با تخلخل کمتری برخوردار بوده و شامل 2/23% :TiAl و 6/69% :Al2O3 می‌باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Milling Intensity of TiO2-Al Powder Mixture on Microwave Synthesis of TiAl/Al2O3 Composite

نویسندگان [English]

  • Parisa Radmehr 1
  • Alireza Zakeri 2
  • Somaye Alamolhoda 3
1 Iran University of Science and Technology (IUST)
2 Iran University of Science and Technology (IUST)
3 Iran University of Science and Technology (IUST).
چکیده [English]

In this research, TiAl/Al2O3 composite was synthesized from mechanically activated TiO2-Al powder mixtures using microwave heating. The powder mixtures were heated in a microwave oven after milling and pressing into cylindrical tablets. The effect of mechanical activation intensity was evaluated on the ignition time and the resultant reaction products. XRD and SEM analysis were used for evaluation of the synthesized samples. Moreover, the volume percent of the formed phases was calculated from XRD patterns using Maud software. The results confirmed that the composites mainly consist of TiAl and dispersed Al2O3 particles. The dominant phase is Al2O3 with 65-75 vol.% and the amount of TiAl phase varies from 18 to 30 vol.%. The results revealed that with increasing the intensity of activation, the ignition time first decreased and then increased. At optimum condition with an ignition time of 27 s, the composite structure is more uniform and less porous and it consists of 23.2% TiAl and 69.6% Al2O3.

کلیدواژه‌ها [English]

  • Titanium Aluminide/Alumina Composite
  • Combustion Synthesis
  • mechanical activation
  • Microwave Heating

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