Resumo

FUENTES GUERRERO, UBEIMAR; PARRA VARGAS, CARLOS A  e  SARMIENTO SANTOS, ARMANDO. GLOW DISCHARGE PROCESSING OF THE YBa₂Cu₃O_7-d PEROVSKITE. Dyna rev.fac.nac.minas [online]. 2011, vol.78, n.169, pp.201-205. ISSN 0012-7353.

The abnormal glow discharge applied to the sintering process is a technique recently used for processing both metallic and ceramic materials. This represents a decrease in the time required for sintering and lower energy consumption. These two facts are due to the reactive species generated in the plasma and because the heating is done directly by the bombardment of ions and neutral atoms on the surface of the sample, which is usually placed on the cathode discharge. In this paper we use the abnormal glow discharge of low pressure as an alternative method for the sintering step of the ceramic YBa₂Cu₃O_7-d. The physical properties of samples sintered in glow discharge were compared with the properties of samples sintered in resistive furnace, which is commonly used for production of such materials. Then, a structural analysis is carried out by XRD and microstructural analysis by SEM of YBa₂Cu₃O_7-d samples, which were sintered by the two methods. The experimental results allowed to establish a similar structure for both cases and a lower surface porosity in the samples sintered by plasma. In addition, in the plasma sintering process, the samples show a slight contamination of the surface. The contamination is produced due to sputtering of cathode material of the discharge and can be easily removed by mechanical methods (sanding).

Palavras-chave : Perovskites; Sintering; Glow Discharge..

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