Ceramics-Silikáty 63, (1) 93 - 99 (2019) |
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PREPARATION OF ZrB₂ BY BORO/CARBOTHERMAL REDUCTION IN SPS DEVICE
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Cinert J. 1,2, Ctibor P. 1, Brožek V. 2, Bouda V. 1, Mastný L. 3
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1 Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University, Technicka 2, 166 27 Prague 6, Czech Republic
2 Institute of Plasma Physics, ASCR, Za Slovankou 3, 182 00 Prague 8, Czech Republic
3 University of Chemistry and Technology, Prague, Czech Republic, Technicka 5, 166 28 Prague 6, Czech Republic
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Keywords: Zirconium diboride, Zirconia, Boron carbide, Borothermal reaction, Carbothermal reaction, Spark plasma sintering (SPS)
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ZrB₂ ceramics were prepared by boro/carbothermal reduction, using spark plasma sintering (SPS). This technology allows to control and monitor the ongoing reduction reaction during the sintering of ZrO₂ and B₄C powder mixtures with graphite, leading to the production of ZrB₂. This work shows the effect of several parameters on the amount of produced ZrB₂. The results are compared with literature data. Sintering temperatures in the range 1400 - 1800 °C were chosen for the experiment. For example, after sintering at a temperature of 1800 °C, with a hold time of 15 min, the total amount of ZrB₂ produced from a powder mixture of stoichiometric ratio was more than 60 %. The porosity dropped with increasing sintering temperature to a final value of about 0.3 %. The number of pore sections per square unit dropped with the temperature as well. The final product is composed of very hard as well as rather soft components. |
 PDF (1.9 MB) |
doi: 10.13168/cs.2019.0001
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