The Impact of Cyclic Oxidation in Dissociated Air on the Mechanical Properties of Freeze-Cast ZrB2/MoSi2 Ceramics
Ludovic Charpentier, Eric Bêche, Hervé Glénat, Álvaro Sández-Gómez, Pedro Miranda
TL;DR
This study examines how ZrB2/MoSi2 ceramics withstand high-temperature oxidation, finding that they are suitable for reusable thermal shields below 1800 K.
Contribution
The paper provides new insights into the oxidation behavior and mechanical degradation of ZrB2/MoSi2 ceramics under cyclic high-temperature conditions.
Findings
At 1800 K, ZrB2/MoSi2 forms a protective silica-based oxide layer with semi-parabolic oxidation kinetics.
At 2150 K, the material shows continuous linear oxidation and significant mechanical degradation.
Nanoindentation revealed that oxidation weakens the material, suggesting a temperature limit for reusability.
Abstract
Creating reusable thermal shields would decrease our carbon footprint by eliminating the need for the reapplication of single-use ablative alternatives. Our previous investigations identified ultra-high-temperature ZrB2 with 20 vol.% MoSi2 ceramics as a promising candidate for the fabrication of reusable thermal shields. Therefore, in this study, this material was exposed to cyclic oxidation at 1800 and 2150 K in dissociated air in order to investigate how it might withstand multiple terrestrial re-entries. At 1800 K, we observed semi-parabolic oxidation kinetics with the growth of a protective oxide layer, the silica-based composition of which was determined using XRD and SEM (coupled with EDS). More dramatic damage was observed at 2150 K, with continuous linear oxidation kinetics seen. Cross-section hardness measurements using nanoindentation revealed that the oxidized part of the…
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Taxonomy
TopicsAdvanced ceramic materials synthesis · Advanced materials and composites · Nuclear Materials and Properties