کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10626511 989686 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Porcellanite-CaCO3 high temperature reaction: phases, microstructure, microhardness
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Porcellanite-CaCO3 high temperature reaction: phases, microstructure, microhardness
چکیده انگلیسی
The characteristics of reaction phases, microstructure and microhardness of thermally fused powder mixtures of porcellanite and limestone batched in various proportions have been studied after firing at 1200 °C. X-ray diffraction and scanning electron microscopy were employed in phase and microstructure investigation, respectively. Formed as thermo-chemical reaction products, morphologically flat, thin, randomly orientated plates of 3CaO·Al2O3·2SiO2 and 2CaO·Al2O3·SiO2 embedded in molten 3CaO·2SiO2 characterized the microstructure of compositions originally containing 60 and 70% porcellanite. In contrast, and consistent with XRD phase identification, the microstructures of the mixtures originally containing 75% and higher porcellanite featured predominantly 3CaO·2SiO2-bonded particulate and/or dendritic and fibrous mullite. Retained in compositions originally containing ≥50% porcellanite, remnant unreacted free silica featured microstructurally as fine dispersed rounded particles. For the compositions which fused sufficiently strongly and homogeneously to facilitate indentation hardness testing (50-90% porcellanite), Vickers microhardness increased through maximum then gradually decreased with increasing porcellanite content.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 31, Issue 6, 2005, Pages 839-844
نویسندگان
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