Formation of high-temperature crystalline phases in ceramic from illite clay and dolomite

Sedmale, Gaida Maruta; Šperberga, Ingunda; Sedmalis, Uldis-Jānis; Valančius, Zenonas

doi:10.1016/j.jeurceramsoc.2005.10.012

Cited by 37 publications

(15 citation statements)

References 2 publications

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“…The <2 µm fraction indicates the predominance of illite (65% and 55% for AR and BO, respectively). In general, the illitic clays are frequency used for ceramic products [17]- [20]. TM is kaolinic-illitic clay, with minor amounts of chlorite (~10%) ( Table 1).…”

Section: Xrd Analysesmentioning

confidence: 99%

Identification and Ceramic Application of Some Tunisian Clays

Mahmoudi¹,

Srasra²,

Zargouni³

2015

OALib

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Mineralogy, chemistry, and plasticity of the raw clay materials, outcropping in different Tunisian domains were studied. These clays constitute the only mineral resource of the ceramic industries in Tunisia, and are exploitable at eight quarries. Powder X-ray diffraction analysis revealed that illite and kaolinite are the major mineral phases. However, other clay minerals, such as illite/ smectite mixed-layer, and chlorite are also present. The associated minerals detected in powdered materials are: quartz, calcite, feldspar and, dolomite. These raw materials are marly clays with 6% -14% CaO, represented essentially by calcite; they show the greatest relative amount of Na2O + K 2 O (~3.5%) and iron-oxide (~6%). The plasticity index and liquid limit of crude samples do not exceed 22% and 42%, respectively. This indicates that these clays belong to the zone of illitic clays, classified in the low to moderate plastic domain. The analysis will be used to find appropriate applications for traditional ceramic. In addition, this paper shows that the ceramic defects observed in the pieces manufactured from these Tunisian clays are lamination, cracks, and lower mechanical and bending strength. Some solutions are assured to avoid these ceramic defects.

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Section: Xrd Analysesmentioning

confidence: 99%

Identification and Ceramic Application of Some Tunisian Clays

Mahmoudi¹,

Srasra²,

Zargouni³

2015

OALib

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“…The disappearance and the neomineralisation of mineral bodies, such as the formation of wollastonite, gehlenite and anorthite is the subject of many works (e.g., Cultrone et al, 2001;Mansur and Mansur, 2003;Aras, 2004;Sousa and Hollanda, 2005;Cultrone et al, 2005;Ferrari and Gualtieri, 2006;Jordán et al, 2008;Jordán et al, 2009;Mahmoudi et al, 2010;Pardo et al, 2011). The influence of the heating rate on phase transformation and mullite formation is devoted by Castelein et al, 2001;Tulyaganov et al, 2002;Sedmale et al, 2006;Sahnoun et al, 2008). It's clear that the firing stage is important and decisive in the manufacturing of ceramic bodies, but this step is preceded by a drying stage, which can influence and affect the later stages of production (Tarì and Ferreira, 1998;Tarì et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Optimisation of Drying Parameters of Ceramic Bodies

Mahmoudi¹,

Srasra²,

Zargouni³

2014

American Journal of Geoscience

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This study deals with the mineralogical, physico-chemical and geotechnical analyses of representative Aptian clays in the north-east of Tunisia. X-ray diffraction reveals a predominance of illite (50-60 wt.%) associated to kaolinite and interstratified illite/smectite. The accessory minerals detected in raw materials are quartz, calcite and Na-feldspar. The average amounts of silica, alumina and alkalis are 52, 20 and 3.5 wt.%, respectively. The contents of lime and iron vary between 4 and 8 wt.%. Physical analyses show that the cation exchange capacity is 34.1-45.7meq/100g of air-dried clay. The plasticity test shows medium values of plasticity index (16-a28 wt.%). The linear drying shrinkage is weak (less than 0.99 wt.%) which makes these clays adapt to fast drying. The firing shrinkage and the expansion are limited. A lower firing and drying temperature can be translated into significant energy savings. Currently, these clays are used in the industrial process for the manufacturing of the earthenware tiles. For the better exploitation of the materials and improvement of production conditions, a mathematical formalism is established for the drying parameters. The regression models relate drying shrinkage (d), bending strength after drying (b) and residual moisture (r) with the moisture (m) and the pressing pressure (p).

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“…It has been established [1] that mullite-zirconia ceramic may be prepared from mixed starting compositions, including g-Al 2 O 3 , silica-gel, ZrO 2 mon, Y 2 O 3 with addition of 7.75 -8.75 wt.% illite clay, promoting sintering and formation of a mullite phase at lower temperatures [2]. On the other hand, the importance is indicated in [3,4] of the degree of grinding of the starting powders.…”

Section: Introductionmentioning

confidence: 99%

Effect of ceramic powder fineness on mullite-zirconium ceramic properties

2011

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Results are provided for a study of the development of high-temperature mullite-zirconium ceramic with use of activated ceramic powders prepared by grinding for different times with addition of illite clay, and from pure oxide powders. It is shown that increased activity and amorphicity of ground particles considerably promotes formation of mullite phase at 1200°C, and also transition of the monoclinic modification of ZrO 2 to tetragonal, particularly with an increase in firing temperature. It is proposed that as a result of rapid "freezing" the structure retains the high-temperature modification of ZrO 2 , having a tendency with slow ceramic cooling to transform into the monoclinic modification.

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Formation of high-temperature crystalline phases in ceramic from illite clay and dolomite

Cited by 37 publications

References 2 publications

Identification and Ceramic Application of Some Tunisian Clays

Identification and Ceramic Application of Some Tunisian Clays

Simultaneous Optimisation of Drying Parameters of Ceramic Bodies

Effect of ceramic powder fineness on mullite-zirconium ceramic properties

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