فرایند مکانوشیمیایی در مخلوط TiO2-Al-C برای تولید Al2O3-TiC

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

گروه مهندسی مواد، دانشکده فنی و مهندسی ، دانشگاه یاسوج، یاسوج، ایران

چکیده

مخلوطی از TiO2-Al-C با نسبت استوکیومتری تهیه و فرآیند آسیاکاری در یک آسیای سیاره‌ای در زمان‌های گوناگون انجام شد. نشانه‌ای از واکنش شیمیایی در نمونه پس از یک ساعت آسیاکاری مشاهده نشد اما نشانه یک پیک گرمازا در نتایج آزمون DTA در این مخلوط در دمای حدود 690 درجه سانتیگراد آشکار شد. نتایج آنالیز XRD نمونه های پس از آسیاکاری نشان داد واکنش شیمیایی درمخلوط با نسبت استوکیومتری از مدل MSR تبعیت می‌کند. افزایش زمان آسیاکاری به هفت ساعت منجر به ریز شدن اندازه ذرات شد و نشانه های آمورف شدگی فازها آشکار شد. در اثر گرمایش همدما نمونه پس از 5 ساعت آسیاکاری در اتمسفر آرگن در دمای 1000 درجه سانتیگراد به مدت یک ساعت ، فازهای Al2O3 و TiC (محصولات واکنش) به خوبی متبلور شدند. نشانه‌های این فازها نیز در الگوی XRDباقی مانده جامد پس از آزمون DTA مشاهد شدند. ارزیابی‌های ریز ساختاری نشان دهنده ریز شدن انداره ذرات در اثر آسیاکاری و تغییر مورفولوژی ریز ساختارها در اثر رخداد واکنش شیمیایی بود. محاسبه پارامتر شبکه‌ای فاز TiC در محصولات نهایی نشان داد در اثر فرایند گرمایش همدما، اندازه پارامتر شبکه‌ای تغییر یافته و به مقدار مرتبط به ترکیب استوکیومتری نزدیک می شود. محاسبات ترمودینامیکی برای مخلوط (TiO2-Al-C) انجام شد و واکنش‌های محتمل در این سیستم با استفاده از نرم افزار ترمودینامیکی HSC مورد بررسی قرار گرفت. ارزیابی‌های ترمودینامیکی با نتایج فازیابی در آزمون‌های آسیاکاری و گرمایش همدما مطابقت داشت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Mechanochemical Process in the TiO2-Al-C Mixture to produce Al2O3-TiC

نویسندگان [English]

  • Fatemeh Homayooni
  • Nader Setoudeh
  • Abbas Mohassel
  • Fatemeh Heidari
  • Mohammad Sajjadnejad
Materials Engineering Department, School of Engineering, Yasouj University, Yasouj, Iran
چکیده [English]

The mixture of TiO2-Al-C with stoichiometric ratio was prepared then ball milling process was done in a planetary ball mill in different times. The evidence of a chemical reaction was not detected in the 1 h milled sample however, the sign of an exothermic peak was detected at ~690ºC in the DTA results for this mixture. The XRD results of the as-milled samples indicated that the chemical reaction progresses as MSR model in the mixture with stoichiometric ratio. The decreasing of the particles size and the traces of amorphization were observed after increasing the milling time to 7 hours. The products of rection (i.e., Al2O3 and TiC) were well crystallized after isothermal heating of the 5 h milled sample at 1000 ºC for 1 h under argon atmosphere. The signs of these phases were also observed in the XRD patterns of the solid residues after DTA analysis. The evolution of the microstructures indicated the decreasing in the particle size due to ball milling and the change of morphology of the microstructure due to occurrence of chemical reaction. The assessments of the lattice parameter of the TiC in the final products indicated that the lattice parameter changes and reaches to amount of the stoichiometric composition due to isothermal heating. Thermodynamics assessments were done for the mixture of TiO2-Al-C and the feasibility of the reactions was studied using HSC thermodynamics software. The XRD results of the milled and the isothermally heated samples were accordance with the thermodynamics assessments.

کلیدواژه‌ها [English]

  • Key words: Aluminum oxide
  • Anatase
  • Ball milling
  • MSR reaction
  • Rutile
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