Modeling and Simulation of the Effect of the Firing Curve on the Linear Shrinkage of Ceramic Materials: Laboratory Scale and Industrial Scale

Cargnin, Maykon; Souza, Selene M.A. Guelli U. de; Souza, Antônio Augusto Ulson de; Noni, Agenor De

doi:10.1590/0104-6632.20150322s00002876

Cited by 11 publications

(10 citation statements)

References 9 publications

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“…In the Terra Alta clays (Fig. 3), the shrinkage increases slowly up to a temperature comprised between 1050 °C (HS kaolin) and 1200 °C (PnB kaolin), followed by an abrupt increase produced by the appearance of a liquid phase [4]. This increase facilitates the water circulation and penetration into the pores and finally, closes the porosity; as a consequence, the water absorption decreases steeply.…”

Section: Thermal Propertiesmentioning

confidence: 97%

“…Kaolinitic materials have acquired an increasing importance by the use of ceramics in new industrial applications [1,2] in addition to the classical uses. Determining the optimal firing temperature for a clay is essential to produce quality ceramics to use not more energy than is strictly necessary, thus the mechanical properties of the fired clays deepen on these temperatures [3,4]. The firing conditions are critical parameters to define the colour in ceramics, which is one of the hardest problems in the ceramic industry [5].…”

Section: Introductionmentioning

confidence: 99%

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Thermal behaviour of ceramics obtained from the kaolinitic clays of Terra Alta, Catalonia, Spain

Garcı́a-Vallés

Cuevas

Alfonso

2021

J Therm Anal Calorim

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The thermal properties and evolution of mineralogy and colour of kaolinitic clay from the Terra Alta region were studied. The mineralogy of these materials consists mainly of kaolinite (13–27 mass%) and quartz (48–86 mass%). Minor illite, hematite, K-feldspar and calcite also occur. The linear expansion and absorption curves were used to predict the optimal firing temperature of the raw clays. During firing, from 1100 °C the water absorption decreases steeply, due to an increase in liquid phase, which penetrates into the pores and close the porosity. At this temperature, the firing shrinkage increases progressively. The fired clays are mainly composed of quartz, cristobalite and mullite, with minor hematite and rutile. Mullite starts to appear at 1050–1100 °C. SEM observations show that porosity decreases with the firing temperature. The colour properties were measured in the raw clays and in the fired bricks at different temperatures. The lightness, L*, is lower in the fired test pieces respect to the natural clays. This colour varies according to the hematite content, being from white to reddish in the fired samples.

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Section: Thermal Propertiesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Thermal behaviour of ceramics obtained from the kaolinitic clays of Terra Alta, Catalonia, Spain

Garcı́a-Vallés

Cuevas

Alfonso

2021

J Therm Anal Calorim

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“…Worldwide, in most modern large-scale advanced ceramic tile industries the production is already carried out through the rapid sintering cycle process in roller kilns [17]. Small-scale common clay ceramic industries, however, still use dry pressing conformation process, typical of their traditional practice for bricks production [17,18]. The implementation of the rapid sintering was consolidated since the 80's in the sector of ceramic tiles and sanitary wares [19].…”

Section: Introductionmentioning

confidence: 99%

Heating rate effect during sintering on the technological properties of Brazilian red ceramics

Guimarães¹,

Delaqua²,

Azevedo³

et al. 2022

Int J Adv Manuf Technol

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Unbalanced energy consumption in the production of ceramic artifacts is responsible for considerable undesirable impacts, such as increased emissions of polluting gases, excessive consumption of fuel materials, land degradation and unpredictable nancial costs. By contrast, the practice of optimizing the ceramic sintering, which in associated with ring of high temperature, can result in increased productivity and reduced production costs preserving an environmentally friendly production system. Moreover, it allows further improvements in the quality of the nal product. This work compares the effect of different sintering cycles, with heating rates of 2, 15 and 30°C/min, on the technological properties of a Brazilian industrial clay ceramic body. Initially the clay ceramic specimens was characterized in terms of mineralogical, chemical and physical properties. Specimens were prepared by extrusion and red at temperatures of 800, 900 and 1000°C. The evaluated properties by standard tests were water absorption, post-ring linear shrinkage and exural strength. It was found that owing to sintering carried out at higher heating rates, red ceramic products with superior technological properties were obtained. This is an unprecedented conclusion for common clay ceramics produced in Brazil. Based on the promising obtained results it is evidenced, in a clear and detailed way, the bene ts of rapid sintering cycle application for conventional brick production.

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“…Modeling and numerical simulation have been used to describe the thermal and structural mechanical behavior of ceramic tiles during the firing stage. Simulation to determine the final size of ceramic tiles was studied by De Noni and Cargnin et al . Cantavella, De Noni Junior et al, and Dal Bó et al .…”

Section: Introductionmentioning

confidence: 99%

Effect of specimen geometry on kinetics of thermal decomposition of minerals in porous ceramic tiles

Cargnin

Kammer

Souza

et al. 2019

Int J Applied Ceramic Tech

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Porous ceramic tiles are used as covering for indoor vertical surfaces in buildings. Clay and limestone are the starting raw materials. The firing step consolidates the product's properties in the manufacturing process. In this step several reactions occur, among them are the dehydroxylation of the clay minerals and decomposition of the carbonates. This study determined the kinetics parameters associated with the decomposition of these 2 minerals. Two different methods of samples preparation were investigated. In the first method, 60 mg of a spray‐dried powder was submitted to analysis in traditional thermogravimetric equipment. In the second method, compacted specimens with dimensions of 80 × 20 × 2.5 mm³ and a mass of 7 g, compacted at 25 MPa, were submitted to analysis using customized thermogravimetric apparatus. The curves were obtained for 6 different heating rates between 2.5 and 20 K min−1. The activation energy, the pre‐exponential factor of the specific velocity equation, and the reaction mechanism were determined. Depending on the methods and compaction degree the activation energy varies from 177.0 to 224.7 kJ mol−1 and from 188.5 to 230.2 kJ mol−1 for kaolinite and calcium carbonate, respectively. For accurate measurement of the activation energy, the heat transfer needs to be considered for each particular experimental configuration.

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Modeling and Simulation of the Effect of the Firing Curve on the Linear Shrinkage of Ceramic Materials: Laboratory Scale and Industrial Scale

Cited by 11 publications

References 9 publications

Thermal behaviour of ceramics obtained from the kaolinitic clays of Terra Alta, Catalonia, Spain

Thermal behaviour of ceramics obtained from the kaolinitic clays of Terra Alta, Catalonia, Spain

Heating rate effect during sintering on the technological properties of Brazilian red ceramics

Effect of specimen geometry on kinetics of thermal decomposition of minerals in porous ceramic tiles

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