تحلیل حرارتی و فازی فرآیند خود احتراقی آلومینوترمیک در سیستم Al-Fe2O3-Cr2O3-NiO

نوع مقاله : علمی و پژوهشی

نویسندگان

• سعید سلطانی ¹
• مهدی کلانتر ¹
• محمد رضا پهلوان شمسی ²

¹ بخش مهندسی مواد و متالورژی، دانشکده معدن و متالورژی، دانشگاه یزد

² دانشگاه فنی و حرفه ای میبد

10.22067/jmme.2023.78953.1081

چکیده

روش سنتز احتراقی خود پیشرونده­ی دما بالا به خصوص برای سیستم‌های آلومینوترمیک یک روش نوین برای ساخت انواع ترکیبات بین فلزی، سرامیک ها و کامپوزیت­ها با نقطه­ی ذوب و سختی بالا در مقیاس تحقیقاتی و نیمه صنعتی است. در این مطالعه نمونه مخلوط های پودری همگن سازی شده به نسبت مورد نظر در سیستم‌های آلومینوترمیک  Al-Fe₂O₃، Al-Cr₂O₃، َAl-Cr₂O₃-Si، Al-Fe₂O₃-Cr₂O₃-NiO و Fe₂O₃-NiO مورد آزمون آنالیز حرارتی قرار گرفته و سپس تجزیه و تحلیل ترکیب فازی (تفرق اشعه ایکس) نمونه و مقایسه آنها با یکدیگر انجام گرفته است. نتایج نشان می‌دهد که وارد کردن آلومینیم در مخلوط اولیه آلومینوترمیک اضافه بر مقدار استوکیومتری باعث تشکیل ترکیبات بین­فلزی آلومیناید آهن و آلومیناید کروم به‌عنوان فازهای ثانویه در پوشش کامپوزیتی می­شود. علاوه براین با حضور سیلیسیم در مخلوط اولیه آلومینوترمیک ترکیبات سیلیساید کروم به جای آلومیناید کروم تشکیل می‌شود. در سیستم Al-Fe₂O₃-Cr₂O₃-NiO فاز فلزی فولاد ضدزنگ با ترکیب Fe_0.7Cr_0.19Ni_0.11 و فاز سرامیکی Al₂O₃ شکل می‌گیرند. در صورتی که فقط اکسید نیکل و اکسید آهن در مخلوط پودری اولیه وجود داشته باشند فریت نیکل شکل می‌گیرد.

کلیدواژه‌ها

• فرآیند سنتز خوداحتراقی
• سیستم آلومینوترمیک Al-Fe2O3-Cr2O3-NiO
• آنالیز حرارتی
• آنالیز فازی

موضوعات

• سنتز مواد

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عنوان مقاله [English]

Thermal and phase analysis of aluminothermic self-propagation process in Al-Fe2O3-Cr2O3-NiO system

نویسندگان [English]

• Saeed Soltani ¹
• mahdi kalantar ¹
• mohmmadreza Pahlavanshamesi ²

¹ Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran.

² Technical university of Meybod

چکیده [English]

The high temperature self-progressive combustion synthesis method, especially for aluminothermic systems, is a new method for making all kinds of intermetallic compounds, ceramics and composites with high melting point and hardness. In this study, first the homogenized powder mixtures in the desired ratio in alumino-thermic systems of Al-Fe2O3-Cr2O3-NiO is subjected in differential thermal analysis process and then, the phase composition (X-ray diffraction) of the thermal analyzed samples has been investigated. The obtained results indicate the formation of intermetallic compounds of iron and chromium aluminide as secondary phases with the presence of excess aluminum over the stoichiometric values in the thermally analyzed samples. In addition, with the presence of silicon in the aluminothermic mixtures, chromium silicide compounds are formed instead of chromium aluminide. For the Al-Fe2O3-Cr2O3-NiO system, the metallic phase of stainless steel with a ratio of Fe0.7Cr0.19Ni0.11 and the ceramic phase of Al2O3.are formed. For the Fe2O3- NiO system, only nickel ferrite is formed.

کلیدواژه‌ها [English]

• Self-combustion synthesis process
• Alumino-thermic system of Al-Fe2O3-Cr2O3-NiO
• Thermal analysis
• Phase analysis

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