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首页> 外文期刊>Journal of thermal analysis and calorimetry >Enhancing the crystallization phenomena and strength of porcelain stoneware: the role of CaO
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Enhancing the crystallization phenomena and strength of porcelain stoneware: the role of CaO

机译：Enhancing the crystallization phenomena and strength of porcelain stoneware: the role of CaO

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摘要

Limestone was used to modify the fluxing action of two potash feldspars (a pure potash feldspar and a soda-potash feldspar) labeled P and C, respectively, in the formulation of porcelain stoneware based on Cameroonian raw materials. The effect of limestone addition (0-10 mass%) was investigated in the range of sintering temperature between 1125 and 1300 degrees C. Characterization of sintered samples including thermal behavior (DTA, TG and dilatometry test), phase evolution, densification parameters, flexural strength, morphology as well as pores structure was investigated in details. The maximum flexural strength (138 MPa) was obtained at 1175 degrees C with P series (7 mass% addition of limestone) and at 1200 degrees C (122 MPa) for C series. The maximum density (approximate to 3.1 g cm(-3)) and lower water absorption (approximate to 0%) were obtained at 1200 degrees C. Mullite and anorthite were identified as main crystalline phases. Starting from 1175 degrees C and mostly at 1200 degrees C, the two series compositions (with 7 mass% addition) presented a self-glazing phenomenon which gave them significant brightness and high aesthetic quality; these properties were accomplished only at 1300 degrees C for reference samples with no lime addition (P0 and C0). A proper addition of limestone (3-7 mass%) with potash feldspar significantly reduced the sintering temperature (similar to 150 degrees C) and permits the production of high strength (122-138 MPa), low energy and sustainable porcelain stoneware.

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