Development of engobe coatings based on alkaline kaolins

Khomenko, Olena; Datsenko, B. M.; Sribniak, Nataliia; Nahornyi, Mykola; Tsyhanenko, Liudmyla

doi:10.15587/1729-4061.2019.188126

Cited by 4 publications

(3 citation statements)

References 20 publications

(19 reference statements)

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“…Engobe coatings qualitatively selected to the ceramic base, in addition to decorative, perform a protective function. It implies reducing the porosity of products by creating a dense outer layer [4], which slows down the destruction of their structure under the influence of environmental factors.…”

Section: Introductionmentioning

confidence: 99%

Designing engobe coatings for ceramic bricks

Khomenko

Tsyhanenko

et al. 2023

EEJET

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This paper reports research into the development of compositions of engobe coatings for ceramic bricks and investigating the influence of technological production factors on their physical and mechanical properties. The results of this work make it possible to solve the task of expanding the range and improving the operational properties of building ceramics. The data obtained have made it possible to establish physicochemical processes occurring during the formation of the phase composition and structure of engobe coatings. This has revealed the possibilities for designing engobe for various types of ceramic bricks, which differ in technological parameters of production and operational properties. The charge compositions were designed in a three-component system "refractory clay – quartz sand – cullet", taking into account the possibility of their practical implementation in large-tonnage production. It has been established that the most important condition for obtaining high-quality products is the correlation of shrinkage and temperature coefficients of linear expansion of the ceramic shard and engobe coating. To prevent various defects, these indicators should vary by no more than 10 %. The crystal-phase composition of engobe is represented by b-quartz and a small amount of devitrite, which are evenly distributed in a vitreous dense layer of coating on the surface of the ceramic shard. Distinctive features of the results relate to the fact that a solution to the problem of designing engobe coatings for ceramic bricks has been proposed and the physicochemical bases of production have been highlighted. This paper also suggests ways to achieve coordination of finely dispersed coatings with coarse-grained ceramic masses by shrinkage and thermal processes. The results reported here could be applied in typical production of face, clinker, and in some cases – ordinary brick or ceramic stone with firing temperatures of 950–1150 °C

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Section: Introductionmentioning

confidence: 99%

Designing engobe coatings for ceramic bricks

Khomenko

Tsyhanenko

et al. 2023

EEJET

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“…Recently, special attention has been paid to decorative properties of ceramic bricks. The most common methods of construction products decoration are engobe coatings [3] and volumetric coloring [4].…”

Section: Introductionmentioning

confidence: 99%

Peculiar Features of Formation of the Phase Composition of Black Clinker Ceramics

Khomenko

Sribniak

Ivchenko

et al. 2023

Period. Polytech. Chem. Eng.

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This paper examines the peculiarities of the phase composition of black clinker bricks based on the ceramic masses of Kerameya enterprise (Sumy, Ukraine). The principles of charge choice are given considering the ratio of coloring oxides Fe2O3, CoO, MnO2, Mn3O4 and CuO. We found that the phase composition of black clinker bricks after firing at 1100 °С is mainly represented by quartz, microcline, mullite, residues of biotite, as well as hematite and hausmannite as the coloring phases, and also small amounts of cuprite. To produce black ceramic bricks on the basis of clay composition, we need to take 13.5 wt% elements with the ratio of Mn: Fe: Ti: Cu equal to 4.2: 7.7: 0.5: 1.1. Such ceramic mass is already used to produce ceramic clinker bricks with water absorption of 5%, mechanical compressive strength of more than 35 MPa and frost resistance of more than 150 freezing and thawing cycles.

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“…The production of engobe coatings for ceramic tiles is a rather complex process and largely depends on the choice of raw materials for the composition of the engobe. The main determining factors for raw materials are availability and relatively affordable cost for multi-tonnage production [17]. Traditionally, the basic raw materials used in the production of engobe coatings are clay, kaolin, quartz, and feldspar [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of SiO2/Al2O3 ratio on the whiteness of ceramic tile engobes with low zircon content

Varışli,

Taşkıran,

Öztürk

et al. 2023

Cerâmica

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Micronized zircon (ZrSiO 4 ) is used as an opacifier in the production of engobes, opaque glazes, and floor tile bodies. Elevated price levels incentivize researchers to develop alternative engobe formulations with reduced zircon ratios. In this study, new engobes with low zircon content were developed with varying SiO 2 -Al 2 O 3 mixtures. The effect of the SiO 2 /Al 2 O 3 ratio on the performance and opacity of the wall and floor tile engobes was investigated. It has been observed that the amount of zircon in the sample compositions could be reduced up to 40% by optimizing the refractoriness-water absorption balance of the engobe with the SiO 2 /Al 2 O 3 ratio while keeping the opacity in the preferred levels. The color difference (∆E) value relative to the standard surface was below 1, which is acceptable for visual perception for all the samples. Other measurements such as water absorption and firing shrinkage of the floor tile samples were found to be compatible with the standard composition. Keywords: ceramic, engobe, opacifier, SiO 2 /Al 2 O 3 ratio, tile, zircon.

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Development of engobe coatings based on alkaline kaolins

Cited by 4 publications

References 20 publications

Designing engobe coatings for ceramic bricks

Designing engobe coatings for ceramic bricks

Peculiar Features of Formation of the Phase Composition of Black Clinker Ceramics

Effect of SiO2/Al2O3 ratio on the whiteness of ceramic tile engobes with low zircon content

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