تولید سرامیک نانولایه‌ای Ti3SiC2

فراتی‌راد, حمزه; قنادی‌مراغه, محمد; بهاروندی, حمید رضا

نوع مقاله : مقاله پژوهشی

نویسندگان

پژوهشکده‌ی مواد و سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی

چکیده

ترکیبات سه‌تایی نانولایه‌ی Ti₃SiC₂، یک گروه جدید از مواد هستند که ویژگی‌های فلزها و سرامیک‌ها را نشان می‌دهند. Ti₃SiC₂ شبیه فلزها، هدایت حرارتی و الکتریکی بالا، مقاومت بالا در برابر شوک حرارتی، سختی پایین و ماشین‌پذیری خوبی را نشان می‌دهد. همچنین Ti₃SiC₂ مشابه یک سرامیک مدول یانگ بالا، استحکام در دمای بالا و مقاومت در برابر اُکسایش خوبی دارند. در این مقاله، قطعات Ti₃SiC₂ از طریق مذاب خورانی مایع سیلیکون به درون پیش‌سازه‌هایی از پودر TiC سنتز می‌شود. قرص سیلیکون به شکل منبع فلز مذاب، بالای نمونه‌ها قرار داده می‌شود. ترکیب اولیه را می‌توان با فرمول 3TiC_/1.3Si نشان داد. تشکیل فاز و ریزساختار با XRD و SEM مجهز به آنالیز عنصری EDS بررسی شد. نتایج نشان داد که پیش‌سازه‌ی TiC، به منظور سنتز مکس فاز با Si وارد واکنش میشود و در کنار مکس فاز ناخالصی SiC، در سطح مقطع نمونه‌ها ظاهر می‌شود. همچنین مشخص شد که ترکیب نمونه‌ها به زمان مذاب خورانی به شدت وابسته است و با افزایش مدت زمان، Ti₃SiC₂ به ترکیب TiC تجزیه می‌شود.

کلیدواژه‌ها

20.1001.1.17351871.1396.38.1.7.5

عنوان مقاله [English]

Production of Ti3SiC2 Nanolayered Ceramic

نویسندگان [English]

H Foratirad
M Ghanadi Maragheh
H. R Baharvandi

چکیده [English]

The nanolayered ternary compound Ti₃SiC₂ is a representative of those materials that exhibit the characteristics of both metals and ceramics. Similar to metals, Ti₃SiC₂ shows high electrical and thermal conductivity, high thermal shock resistance, ductility and good machinability. Further, similar to a ceramic, Ti₃SiC₂ has a high Young’s modulus, as well as, high temperature strength and oxidation resistance. In this paper, T₃SiC₂ bulks have been synthesized by infiltrating Si liquid into a porous preform composed of solid TiC powders. Silicon pellets were placed on the top of the precursor pellets as the liquid source. The starting compositions can be represented by the formula 3TiC/1.3Si. The phase formation and microstructure were investigated by the X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with an energydispersive spectroscopy (EDS) system. The results demonstrated that the TiC preform could react with Si in order to MAX phase synthesis and SiC impurities appeared in the cross section of the samples. It is found that the compositions of the samples strongly depended on the time of infiltration. Moreover, an increase in the time, decomposed Ti₃SiC₂ into TiC compound.

کلیدواژه‌ها [English]

Titanium Carbide
Ti3SiC2 MAX Phase
Gelcasting
Infiltration

مراجع

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مجله علوم و فنون هسته ای

تولید سرامیک نانولایه‌ای Ti3SiC2

مراجع

مراجع

دوره 38، شماره 1 - شماره پیاپی 79
خرداد 1396
صفحه 63-74

تولید سرامیک نانولایه‌ای Ti3SiC2

مراجع

مراجع

دوره 38، شماره 1 - شماره پیاپی 79خرداد 1396صفحه 63-74

دوره 38، شماره 1 - شماره پیاپی 79
خرداد 1396
صفحه 63-74