کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7899219 1510142 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation on cristobalite crystallization in silica-based ceramic cores for investment casting
ترجمه فارسی عنوان
بررسی کریستالیزاسیون کریستوبالیت در هسته های سرامیکی بر پایه سیلیکا برای ریخته گری سرمایه گذاری
کلمات کلیدی
در محل کریستوبالیت، بلورسازی، اشباع، سیلیس فروخته شده هسته سرامیک،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
In this work, cristobalite crystallization and its effects on mechanical and chemical behaviour of injection moulded silica-based ceramic cores were investigated. In order to simulate casting process condition, the sintered samples at 1220 °C were also heated up to 1430 °C. Flexural strength test was carried out on both sintered and heat treated samples. Chemical resistance of the cores was evaluated by leaching the samples inside 43 wt% KOH solution at its boiling point. Phase evolution and microstructure were investigated by thermal analyses (DTA and DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical microscopy (OM). Results showed that cristobalite was crystallized on the surface of fused silica grains at about 1380 °C. Flexural strength of the sintered cores was decreased after simulated casting heat treatment due to cristobalite phase transformation. The formed cristobalite on the surface of fused silica grains dramatically decreased the leachability of ceramic cores.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 33, Issues 15–16, December 2013, Pages 3397-3402
نویسندگان
, , ,