| Full text | |
| Author(s): |
S. Cava
[1]
;
E. Longo
[2]
;
C. A. Paskocimas
[3]
;
J. A. Varela
[4]
;
A. Tasca
[5]
;
T. Mendonça
[6]
;
C. G. Herter
[7]
;
J. C. Barbosa Jr.
[8]
Total Authors: 8
|
| Affiliation: | [1] Universidade Federal de São Carlos. Departamento de Química. Laboratório Interdisciplinar de Eletroquímica & Cerâmica - Brasil
[2] Universidade Federal de São Carlos. Departamento de Química. Laboratório Interdisciplinar de Eletroquímica & Cerâmica - Brasil
[3] Universidade Estadual Paulista. Instituto de Química - Brasil
[4] Universidade Estadual Paulista. Instituto de Química - Brasil
[5] White Martins Gases Industriais
[6] White Martins Gases Industriais
[7] White Martins Gases Industriais
[8] Eliane Revestimentos Cerâmicos
Total Affiliations: 8
|
| Document type: | Journal article |
| Source: | Cerâmica; v. 46, n. 298, p. 56-60, 2000-06-00. |
| Abstract | |
In the single firing process for the production of ceramic tiles, the appearance of the "black core" defect occurs under determined conditions of raw materials and parameters of the industrial process. It was then decided to investigate the effects of an oxygen enriched atmosphere for minimizing the occurrence of defects such as "black core", with the goal of reducing the firing cycle. A complete physical and chemical characterization of the used raw materials was carried out. Raw material samples were fired in an electrically heated laboratory kiln of the chamber type. It presents controlled atmosphere and is able to simulate the fast firing process. Flows of pure oxygen and/or of oxygen blends were continuously introduced into the kiln, using two different methods. The tendency for eliminating the "black core" was assessed by measuring the ratio between the "black core" volume and the overall volume of the sample. The results, obtained upon the use of the proposed method of oxygen addition, show that the effect of the oxygen enriched atmosphere follows the equations determined by the kinetic models of the oxi-reduction reactions, which in this case determines the pattern of elimination of the "black core" defect as a function of the atmosphere modified by the oxygen introduced into the kiln. This indicates that besides improving the quality of the final product, it is possible to increase the productivity, reducing the firing cycle. (AU) | |