Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 12, Pages 3829-3843Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.03.060
Keywords
ZrB2-SiC; YB4; Oxidation; Oxyacetylene torch; ZrxY1-xO1.5+x/2
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Funding
- Slovak Grant Agency VEGA Project [2/0152/18]
- MVTS -ULTRACOM project
- Research & Innovation Operational Programme - ERDF [313021T081]
- [APVV-15-0540]
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The influence of YB4 and Y2O3 on densification, mechanical properties and oxidation performance of ZrB2-SiC (ZS) composite was studied. The oxidation tests were performed in static air up to temperature of 1650 degrees C for 1 h as well as under dynamic conditions of oxyacetylene torch at 2000 degrees C. Static oxidation of ZS led to the formation of protective silica-based glass on the surface. However, ablation tests showed absence of silica in ablation centre. Only dense zirconia layer was left on the top of ZS. Composites with Y-containing additives exhibited significantly inferior oxidation performance in static conditions, since severe spallation and deeper degradation of the material were observed. On the contrary, the depth of material degradation after ablation was comparable with ZS. Samples were covered by solid solution of zirconia and yttria. Due to very low vapor pressure, yttria-based oxidation products are of interest considering even higher application temperatures exceeding 2000 degrees C.
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