Nanoscale composites based on Al2O3 AND SiC prepared by electroconsolidation method
2020
Gevorkyan, E., Ukrainian State Univ. of Railway Transport, Kharkiv (Ukraine) | Rucki, M., Kazimierz Pulaski Univ. of Technology and Humanities in Radom (Poland) | Vovk, R., V. N. Karazin Kharkiv National Univ. (Ukraine) | Chishkala, V., V. N. Karazin Kharkiv National Univ. (Ukraine)
In the paper, preparation and characteristics of nanoscale composites based on mixtures of Al2O3 with additions of SiC up to 50 wt % are described. In the experiments, electroconsolidation of powdered ceramic materials was performed in different proportions at temperatures between Tsint = 1400 and 1800 ºC during 2, 3 or 4 minutes. The sintered samples were analysed in the terms of grain growth, grain dispersion and material densification related to the sintering parameters (time and temperature) and proportion of powders. One of the most important findings was that the nanodispersed SiC supported better densification. It was demonstrated that the prolonged sintering time caused decrease of small dispersed particles, while larger particles increased in number. The obtained density of sintered material was higher than that recently reported, but achieved at substantially lower energy consumption and cheaper equipment.
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