بررسی تأثیر مقدار و منبع کربن بر سنتز نانوساختار Ti2AlC به روش سنتز خود احتراقی دما بالا

محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین

آزاده کریمی ¹ , حمیدرضا بهاروندی ² , حسین عبدی زاده ³

1 - دانشجوی کارشناسی ارشد مهندسی مواد، دانشگاه آزاد اسلامی واحد تهران جنوب، تهران، ایران
2 - دانشیار، مجتمع مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران
3 - استاد، دانشکده مهندسی متالورژی و مواد، دانشگاه تهران، ایران

تاریخ دریافت : 1394/08/27 تاریخ پذیرش : 1396/11/09 تاریخ انتشار : 1396/09/01

کلید واژه: مکس فاز, Ti2AlC, سنتز خود احتراقی دما بالا, منبع کربن,

چکیده مقاله :

در این پژوهش کاربید سه گانه Ti₂AlC با استفاده از مخلوط پودرهای Ti، Al و C به روش سنتز خود احتراقی دما بالا تولید گردید. به‌منظور بررسی تاثیر متغیرهای درصد مولی و نوع منبع کربن در میزان سنتز نانوساختار Ti₂AlC از دو ترکیب C5/0:Al2:Ti2 و C1:Al2:Ti2 و از سه منبع کربن گرافیت، کربن فعال و کربن سیاه استفاده شد. پس از آن که پودرها با نسبت های مورد نظر مخلوط شدند، تحت فرایند SHS  قرار گرفتند. در ادامه به منظور بررسی ترکیب فازی و مشاهده ریزساختار آنالیز پراش اشعه X و میکروسکوپ الکترونی روبشی مورد استفاده قرار گرفت. در نهایت مشخص شد که بیش‌ترین مقدار Ti₂AlC سنتز شده معادل 74% وزنی محصولات، مربوط به نمونه‌ای با ترکیب C5/0:Al2:Ti2 است که در آن از کربن فعال برای تأمین کربن استفاده شده است. همچنین مشاهده شد که با افزایش کربن از 5/0 به 1 درصد مولی در مواد اولیه، درصد وزنی مکس فاز Ti2AlC در محصولات واکنش به‌شدت کاهش می‌یابد.

چکیده انگلیسی:

       In this study, Ti2AlC ternary carbide by mixing of Ti, Al and C powders and by self-propagating high temperature combustion synthesis method has been synthesized. 2Ti:2Al:1C and 2Ti:2Al:0.5C compounds and carbon sources such as graphite, activated carbon and carbon black were used in order to evaluate the variables of composition and carbon source in the synthesis of Ti2AlC Max phase. First, the primary powders were weighed. Then, the supposed mixed powders were dry grinded for 3 hours. Then, they have been formed in pills under 80 MPa pressure. After applying the self-propagating high temperature combustion synthesis process on the samples, X-ray diffraction analysis and field emission transmission electron microscopy were used to study the phase composition and to observe the microstructure, respectively. Ultimately, determined the maximum amount of synthesized Ti2AlC Max phase was 74 Wt. % and it is related to the sample with 2Ti:2Al:0.5C compound in which the activated carbon is used to provide carbon. Also it was observed that with an increase of 0.5 to 1 mole percent of carbon in the raw materials, weight percent of Ti2AlC MAX phase in the reaction products sharply reduced.

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