Authors:F. Genel Ricciardiello, D. Minichelli, and G. Parasporo
The recovery of metals is the process of softening without crystallization in the mechanical stressed pieces and is well characterized
by DSC measurements at temperatures < 600C. The present investigation was undertaken to detect similar effects also in traditional
ceramics. Several ceramic samples, coming from different productions, were thermally analyzed by DSC and the presence, in
the most stressed samples, of an exothermic peak at about 350C, was detected, confirming the presence of recovery in the
ceramics too. However, owing to the complex structures of these materials, at present no mathematical model could be introduced.
Authors:V. Nastro, D. Vuono, M. Guzzo, G. Niceforo, I. Bruno, and P. De Luca
The aim of this paper is to characterize some raw
materials used for ceramics material production. Five samples of clay have
been analyzed. It has been carried out a patterned sampling in a quarry in
Rosarno (South Italy).
properties on clay samples are determined. Test pieces have been prepared
and physical properties after firing are determined by DSC thermal analysis,
XRD analysis and X-ray fluorescence. It is important to note the high amount
of Fe2O3. The mixture principally
contains quartz, illite and oligoclase. It has been observed the colour and
the shape after firing: predominant colour is red. In this case the clay has
been used in mixtures covered with glazes. The colour of internal clay is
hidden by opaque of glazes. The analysed raw materials can be used in a slip
for single fired red tiles. The A2sp clay produces best ceramics at 1000C.
Authors:P. Bowen, M. Daglish, G. Frenzer, J. -F. Ricard, and Y. Wyser
Aluminate sodalite ceramics, (Sr8Al12O24)(CrO4)2) — SACR, have been prepared from solution spray-dried precursors. The spray drying of a mixed aqueous nitrate solution gave an anhydrous powder which was thermally decomposed in air at 1350 °C to give a crystalline SACR powder with a median volume diameter of 4–6 μm. The SACR powder was dry pressed and sintered to >90% density. The yellow SACR powder showed two phase transitions between 10 and 45 °C with a 25 ° intermediate phase region indicative of a low defect concentration in the crystalline structure. A colour change observed in the sintered ceramic (changing to a mixed green/yellow) and a narrowing of the phase transition region (15–40 °C) are discussed. Dielectric measurements were consistent with the presence of two extrinsic ferroelectric transitions at 17 and 35 °C.
Authors:J. Rincon, M. Romero, C. Díaz, V. Balek, and Z. Malek
The silica waste originating from a geothermal power plant in Mexico was investigated with the aim of finding its applicability
as a raw secondary material for ceramics production. The thermal behaviour of the original silica waste (containing NaCl and
KCl from marine brine) and of the purified silica was characterized by means of DTA/TG, emanation thermal analysis (ETA) and
thermodilatometry (TD). The reactivity of the purified silica waste mixed with CaCO3 (1.8 mass%) was characterized by means of ETA, DTA and TG. The microstructures and phase compositions of the final products
prepared by heating in air were tested by means of X-ray diffraction and of scanning electron microscopy coupled with electron
probe X-ray microanalysis. The thermal analysis methods allowed determination of the optimal conditions for thermal treatment
of the silica waste in order to obtain partly sintered porous materials for use as refractory bricks.
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Authors:V. A. Drebushchak, L. N. Mylnikova, and T. N. Drebushchak
Thermal analysis is used for the characterization of ceramics for several decades. In contemporary ceramic industry, thermal analysis allows one to investigate the quality of row materials (clays, minerals, and
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