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wonder | 22 พย 53 - 16:32:05 |
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The crystalline phases identified in all the samples fired are quartz and mullite (Fig. 4). Quartz is  a residual mineral from the original raw materials, and mullite, formed during firing. Porcelain stoneware bodies generally contain a single mullite phase, 3Al2O3·2SiO2, evolution pathway: the dehydroxylated kaolin, metakaolin, transforms into a nonequilibrium unstable spinel type structure, which converts to mullite above 1075 °C [10] and [13]. For the compositions containing glass powder some modifications in intensity and position of the peaks in the
X-ray diffraction patterns indicate the presence of anorthite, and the
amount of which increases with increasing percentage of glass.
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