اثر سیلسیم بر تشکیل ترکیبات بین فلزی آلومیناید تیتانیوم از AlوTiO2

نوع مقاله : علمی و پژوهشی

نویسندگان

• راضیه خوشحال ¹
• سید وحید علوی نژاد خلیل آباد ²

¹ گروه مهندسی مواد دانشگاه صنعتی بیرجند

² گروه مهندسی عمران، دانشگاه صنعتی بیرجند

10.22067/jmme.2023.79696.1086

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

موضوعات

• متالورژی استخراجی

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عنوان مقاله [English]

The effect of silicon on the formation of titanium aluminide intermetallic compounds from Al and TiO2

نویسندگان [English]

• Razieh Khoshhal ¹
• Seyed Vahid Alavi Nezhad Khalil Abad ²

¹ Department of Materials and Metallurgical Engineering, Birjand University of Technology, Birjand, Iran.

² Department of Civil Engineering, Birjand University of Technology

چکیده [English]

In this article, an attempt was made to investigate the effect of the addition of silicon on the titanium aluminide compound formation from TiO2 and Al raw materials. Silicon has a eutectic with aluminum and can reduce its melting temperature, which can have effective impact on the formation of titanium aluminide compounds. On the other hand, due to the production of Ti5Si3 compound, it can be effective in increasing the oxidation resistance of compounds and composites containing titanium aluminide. With this aim in mind, the present paper has strove to determine the impact of this element on the formation of titanium aluminides and the type of titanium silicide phases by adding different amounts of silicon to TiO2 and Al raw materials. The key findings emerged, showed that when silicon is added to the system in small amounts (0.1), it not only does not have a positive effect on the reactions, it also prevents the formation of titanium aluminide compounds, but with an increase in its percentage (0.28), it also causes the formation of these titanium aluminide compounds and leads to the formation of Ti5Si3 phase. This phase changes from a discrete morphology to a continuous state as the percentage of silicon increases (0.6). With a further increase in the amount of silicon (1), the TiSi2 phase is formed, which is dispersed throughout the sample with a string-like structure.

کلیدواژه‌ها [English]

• Titanium aluminide
• Silicon
• Intermetallic compounds
• Mechanism

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