نویسندگان
1 استادیار، پژوهشکده سرامیک، پژوهشگاه مواد وانرژی
2 دانشیار، پژوهشکده سرامیک، پژوهشگاه مواد وانرژی
3 استادیار، پژوهشکده فناوری نانو و مواد پیشرفته، پژوهشگاه مواد وانرژی
4 استادیار، پژوهشکده نیمه هادیها، پژوهشگاه مواد وانرژی
چکیده
در این مطالعه اثر فعالسازی مکانیکی روی مکانیزم سنتز و سینتر همزمان کامپوزیت B4C-TiB2 در نسبت مولی 1:1 از مواد اولیه عنصری (بور، تیتانیوم و گرافیت) مورد بررسی قرار گرفت. آسیاکاری مخلوط مواد اولیه در زمانهای 0 تا 12 ساعت انجام شد. زمان های 0، 3 و 8 ساعت جهت فرایند سینتر با جرقه پلاسما (SPS) انتخاب شدند. مکانیزم تشکیل این دو فاز حین سنتز، همچنین چگالی، ریزساختار نمونه های سنتز و سینتر شده مورد بررسی قرار گرفت. نتایج نشان داد که آسیاکاری مخلوط مواد اولیه نقش مهمی در دما و زمان تبدیل واکنشگرها به محصول دارد ولی تغییری در مکانیزم تشکیل آنها با توجه به شرایط اعمالی SPS ندارد. مکانیزم تشکیل هردو فاز در هر سه زمان انتخاب شده نفوذ حالت جامد بود به طوریکه اولین فاز شناسایی شده TiB بوده که به تدریج بهTiB2 تبدیل میشود و در ادامه فاز B4C تشکیل می گردد. ریزساختار پودرهای سنتز شده پس از پایان یافتن واکنش ها نشان داد که پس از 8 ساعت آسیاکاری مخلوط مواد اولیه پودر نانومتری سنتز می شود. هچنین فعالسازی مکانیکی موجب تغییراتی در ریزساختار و چگالی قطعات نهایی می شود. به طوریکه چگالی قطعات به دست آمده از 0/82 % برای پودر آسیا نشده به 3/94 % برای مخلوط اولیه آسیا شده برای 8 ساعت میرسد. این حالت منطبق با به دست آمدن ریزترین ریزساختار (کمتر از 500 نانومتر ) بود.
کلیدواژه‌ها
عنوان مقاله [English]
The Synthesis mechanism of B4C-TiB2 composite with spark plasma sintering
نویسندگان [English]
- L. Nikzad 1
- T. Ebadzadeh 2
- M.R. Vaezi 3
- S. A. Tayebifard 4
1 Ceramic department, Materials and Energy Research Center
2 Ceramic department, Materials and Energy Research Center
3 Nanotechnology and advanced materials department, Materials and Energy Research Center
4 Semiconductor department, Materials and Energy Research Center
چکیده [English]
The influence of mechanical activation by ball milling (BM) of Ti, B and graphite powders mixture on the synthesis of B4C-TiB2 (1:1 mole ratio) composite by Spark Plasma Sintering (SPS) is investigated. The milled powders at 0, 3 and 8 h were chosen for investigation of synthesis mechanism, density and microstructure of powder and dense products. Results showed the milling influence on temperature and time of reactants conversion to products, but it does not have any effect on mechanism of synthesis. The synthesis process occurs through a solid-state diffusion mechanism where the first crystalline phase formed is TiB, which is gradually converted to TiB2, while the formation of B4C takes place subsequently. Investigation showed that with using 8 h milled reactant; nanostructure composite powder could be obtained. As a consequence of the mechanical treatment up to 8h, SPS product density increases from about 82% to 94% of the theoretical value. Correspondingly, a material with homogeneous phase distribution and grain submicron size is obtained.
کلیدواژه‌ها [English]
- Boron carbide
- Titanium diboride
- Spark Plasma Sintering
- Synthesis
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