By Wilson Acchar, Eduardo J. V. Dultra
This booklet proposes using espresso bagasse ash (CBA) waste as uncooked fabric for use in ceramic formulations. The procedure provided here's a strategy to a present ambiental challenge as CBA waste is discharged in excessive quantities in agriculture. The authors research the potencial of CBA as a cloth to replacement feldspar in tile production.
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Additional info for Ceramic Materials from Coffee Bagasse Ash Waste
As residue R1 is excessively hygroscopic, it is possible that the sample has absorbed significant amounts of water, especially in the region near the surface. The removal of this surface water due to the increase in temperature could have caused such initial contraction. From 200 °C, samples containing residue R1 are expanding, where a volumetric expansion peak can be observed due to allotropic shift of α-quartz to β-quartz around 573 °C and from this temperature, contraction begins to occur. It was observed that, at the temperature range from 573 to 858 °C, the contraction became more discrete in samples with © The Author(s) 2015 W.
Dilatometric analysis and X-ray diffraction after firing as well as the water absorption, porosity and bending strength values are described and compared with the Brazilian norms. 1 Dilatometric Analysis The dilatometric analysis is evaluated for expansion and contraction of sample as a function of temperature (heating) and time. Through the analysis of results, it is possible to determine the thermal expansion coefficient at different temperature ranges. 12. This information is important for evaluating the thermal cycle in the manufacture of ceramic products.
It is easy to perceive the similarity between the thermal analysis of clay and kaolin. This similar behavior confirms the results of the chemical and mineralogical composition of both materials. 98 °C is due to the allotropic transformation of α-quartz into β-quartz. This transformation was more noticeable in kaolin in relation to clay due to the greater amount of quartz present in the kaolin sample. 42 °C in the DTA curve refers to the formation of the Si–Al spinel, and is more evident in kaolin due to the greater amount of kaolinite present in kaolin in relation to clay.