Síntese e caracterização estrutural de pigmentos cerâmicos a base de cromita por método químico

• Autor(a) principal: Rangel, José Hilton Gomes
• Data de Publicação: 2012
• Outros Autores: Pereira, Edilson Batista S., Gonçalves Júnior, Paulo Roberto Garcês, Oliveira, Marcelo Moizinho, Vasconcelos, Jomar Sales, Silva, Elson Longo da [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www2.ifrn.edu.br/ojs/index.php/HOLOS/article/view/990; http://hdl.handle.net/11449/123451
• topic: espinélio; Cromita de cobre; Pigmento inorgânico; Pechini; Spinels; Chromite Copper; Inorganic Pigment; Pechini

The ceramic pigments are colored inorganic substances that during the process of dispersion in the ceramic glazes and subsequent calcination, are stable against physical and chemical attack. Therefore, they are crystalline compounds applied in the ceramic industry for coloring vitreous base. In this study, the Pechini method was used for obtaining the pigment CuCr2O4 with heat treatment at the temperatures of 800, 900 and 1000 ° C. The powder pigments were characterized on their structural, morphological and colorimetric aspects. The thermal analysis conducted on an amorphous precursor in a TG / DTA indicates the weight loss in the entire temperature range investigated, with characteristic exothermic peak of the elimination of the organic composition of the precursor around 300°C. The development of the crystalline phases were investigated by XRD, using a diffractometer with Cu Ka radiation and graphite monochromator, where it was observed the presence of crystalline phases corresponding to Cr2O3 and CuCr2O4.The measurements of the specific surface area of the powders pigments were carried out in an equipment Micromeritcs, model ASAP 2000, using N2 as gas of adsorption/desorption. The colorimetric measurements of the pigments were made in a colorimeter Gretac Macbeth Color-eye spectrophotometer 2180 / 2180UV in CIELAB standards. Based on the obtained results, it can be verified the thermal stability of the powder pigments of green coloration, which enables it as an alternative to the materials currently used in the manufacture of ceramic tiles.