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اثر سیلسیم بر تشکیل ترکیبات بین فلزی آلومیناید تیتانیوم از AlوTiO2 | ||
مهندسی متالورژی و مواد | ||
دوره 34، شماره 1 - شماره پیاپی 29، فروردین 1402، صفحه 47-58 اصل مقاله (1.37 M) | ||
نوع مقاله: علمی و پژوهشی | ||
شناسه دیجیتال (DOI): 10.22067/jmme.2023.79696.1086 | ||
نویسندگان | ||
راضیه خوشحال* 1؛ سید وحید علوی نژاد خلیل آباد2 | ||
1گروه مهندسی مواد دانشگاه صنعتی بیرجند | ||
2گروه مهندسی عمران، دانشگاه صنعتی بیرجند | ||
چکیده | ||
در این مقاله سعی شد تا تاثیر افزایش سیلسیم بر واکنشهای تولید ترکیبات آلومیناید تیتانیم از مواد اولیه TiO2 و Al بررسی شود. سیلسیم از یک طرف دارای یوتکیتک با آلومینیم است و میتواند دمای ذوب آن را کاهش دهد که این امر به دلیل تعیین کننده بودن مرحله ذوب آلومینیم در تشکیل ترکیبات آلومیناید تیتانیم اثرگذار باشد. از طرف دیگر به دلیل تولید ترکیب Ti5Si3 قادر است در افزایش مقاومت به اکسیداسیون ترکیبات و کامپوزیتهای حاوی آلومیناید تیتانیم موثر باشد. لذا در این تحقیق سعی شد با افزودن مقادیر متفاوتی از سیلسیم پودری به مواد اولیه پودری TiO2 وAl و حرارت دادن آن در دمای ºC950 بررسی شود که آیا افزودن سیلسیم پودری میتواند به تشکیل فاز مقاوم در برابر اکسیداسیون Ti5Si3 کمک کند. همچنین این فاز در چه نسبتی از مواد اولیه و با چه مورفولوژی ایجاد میشود. نتایج نشان داد که وقتی سیلسیم در مقادیر کم به سیستم افزوده میشود (نسبت 1/0) نه تنها تاثیر مثبتی بر انجام واکنشها ندارد که جلوی تشکیل ترکیبات آلومیناید تیتانیم را نیز میگیرد. با بیشتر شدن درصد آن هم به تشکیل این ترکیبات آلومیناید تیتانیم میکند و هم منجر به تشکیل فاز Ti5Si3 میشود (نسبت 28/0). این فاز با بیشتر شدن درصد سیلسیم از مورفولوژی گسسته به حالت پیوسته تغییر فرم پیدا میکند (نسبت 6/0). با افزایش بیشتر میزان سیلسیم (نسبت 1)، فاز TiSi2 تشکیل میشود که با ساختار رشتهای شکل در سراسر نمونه پراکنده میشود. | ||
کلیدواژهها | ||
آلومیناید تیتانیم؛ سیلسیم؛ ترکیبات بین فلزی؛ مکانیزم | ||
مراجع | ||
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