Preparation of ZrB2 by boro/carbothermal reduction in SPS device

0503656 - ÚFP 2020 RIV CZ eng J - Journal Article
Cinert, Jakub - Ctibor, P. - Brožek, Vlastimil - Bouda, V. - Mastný, L.
Preparation of ZrB2 by boro/carbothermal reduction in SPS device.
Ceramics - Silikáty. Roč. 63, č. 1 (2019), s. 93-99. ISSN 0862-5468. E-ISSN 1804-5847
R&D Projects: GA ČR GB14-36566G
Institutional support: RVO:61389021
Keywords : zirconium diboride * zirconia * boron carbide * borothermal reaction * carbothermal reaction * spark plasma sintering (SPS)
OECD category: Ceramics
Impact factor: 0.820, year: 2019
Method of publishing: Open access
https://www.irsm.cas.cz/materialy/cs_content/2019_doi/Cinert_CS_2019_0001.pdf

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.
Permanent Link: http://hdl.handle.net/11104/0295467