Engenharia Química

URI Permanente desta comunidade

http://repositorio.ufes.br/handle/10/17472
Programa de Pós-Graduação em Engenharia Química

Centro: CCAE
Telefone: (28) 3552 8719
URL do programa: http://www.engenhariaquimica.alegre.ufes.br/pos-graduacao/PPEQ

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Navegando Engenharia Química por Autor "Borges Junior, Luiz Antônio"

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    Produção de cerâmica de revestimento utilizando resíduos de rochas ornamentais provenientes do tear de fio diamantado
    (Universidade Federal do Espírito Santo, 2017-07-25) Gomes, Tiago Marvila; Neves, Mirna Aparecida; Borges, Simone Pereira Taguchi; Borges Junior, Luiz Antônio; Guimarães, Damaris
    Brazil is one of the largest producers of dimension stones in the world. Besides the economic advantages brought by the sector, there is also the generation of significant amount of fine solid wastes. The composition of these wastes shows the possibility of using them in several products, such as in manufacture of ceramic coating. The aim of this work was to use dimension stone waste from the diamond wire loom for production of ceramic coating. Compositions were prepared containing 40%, 50% and 60% of waste in the ceramic base, which were characterized regarding to the crystalline phase, particle size distribution and plasticity. Ceramic plates were sintered at 1100 °C and analyzed concerning to density, linear shrinkage and water absorption. Glazes were prepared with 40, 45 e 50 % of waste. Using these glazes and the base ceramic, ceramic coating were prepared and analyzed visually regarding to adhesiveness and chemical attack. Wettability test was carried out using the Sessile Drop method, that evolve the fusion of glazed proof bodies with 3 mm x 3 mm x 3 mm on sintered red ceramic with 30 mm x 30 mm x 5 mm. The contact angle was measured during fusion of the glazed material and the results were treated through factorial 22 analysis. The results indicate that the studied compositions have potential for industrial applications, presenting water absorption values close to 10%, contact angles - of the glaze in the base ceramic - smaller than 45° and a good adherence of the ceramic coating.
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    Utilização de resíduo de rochas ornamentais para produção de cerâmica de revestimento
    (Universidade Federal do Espírito Santo, 2017-02-21) Oliveira, Gabrielly Sandrine de; Borges, Simone Pereira Taguchi; Borges Junior, Luiz Antônio; Barañano, Audrei Giménez; Guimarães, Damaris
    Brazil is among the main producers of natural stones. The extraction and processing of granites and marbles generates an enormous quantity of fine waste, from their extraction to the polishing. In this work, the dimension stones waste of diamond multi-wire machine was used in the engobe and glaze for application as a coating ceramic, because it has similar composition and granulometry to clay (basic constituent of these ceramics). After chemical characterization of the dimension stones waste and clay, some additives (fluxes, dyes and stabilizers) were mixed with the waste, and the engobe and enamels were prepared in different proportions. These compositions were tested to coating the ceramics with 30 mm X 30 mm X 5 mm, in the single firing and double firing processing, aiming to obtain more uniform surface and better technological properties. The single firing presented better surface results, being thus reproduced in the base ceramics with 100 mm x 100 mm x 5 mm. These ceramics were analyzed for relative density, shrinkage, water absorption, chemical attack resistance, and abrasion resistance, in according to NBR ABNT 13818 standard. The ceramics after sintering showed some cracks and relative density of approximately 77.8%. The double firing ceramics presented 5.14 ± 0.44% of linear retraction, and the single firing ceramics presented 4.35 ± 0.44%, values close to the literature. The samples were classified as “Class A” for the chemical attack tests, considered as excellent resistance. It can be concluded with wear test that the ceramic coating produced is indicated for residences or areas where it is usually walked with slippers or bare feet, and this ceramic is classified as PEI 1.