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Oxidation resistance of ZrB₂‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid

Petry, Nils‐Christian ; Ulrich, Anke Silvia ; Feng, Bo ; Ionescu, Emanuel ; Galetz, Mathias Christian ; Lepple, Maren (2022)
Oxidation resistance of ZrB₂‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid.
In: Journal of the American Ceramic Society, 2022, 105 (8)
doi: 10.26083/tuprints-00021533
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Oxidation resistance of ZrB₂‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: Wiley
Journal or Publication Title: Journal of the American Ceramic Society
Volume of the journal: 105
Issue Number: 8
DOI: 10.26083/tuprints-00021533
Corresponding Links:
Origin: Secondary publication DeepGreen

The focus of the present work is the investigation of the influence of polymer‐derived ceramics, used as sintering aids for preparing ZrB₂‐based monoliths, on their high‐temperature oxidation behavior. For the preparation of the monoliths, ZrB₂ powder was coated with polymer‐derived SiCN, SiZrCN, or SiZrBCN and subsequently densified via hot‐pressing at temperatures as low as 1800°C. To investigate the oxidation kinetics, thermogravimetric analysis (TGA) was performed at 1300°C in synthetic air with exposure times of 50 and 100 h. A detailed study of the materials oxide scale and subsurface microstructure was conducted using optical microscopy, electron probe microanalysis, scanning electron microscopy, and X‐ray diffraction. The experimental findings were compared to thermodynamic equilibrium calculations using the CALPHAD method, which led to a better understanding of the oxidation mechanism. In comparison to the literature data of ZrB₂–SiC, the results show improved oxidation resistance for all three investigated materials. The formation of gaseous species during oxidation, in particular CO, CO₂, B₂O₃, and SiO, within the oxide scale of the monoliths was rationalized via CALPHAD calculations and used to explain the oxidation behavior and kinetics and also the formation of bubbles in the subsurface region of the oxidized specimens.

Uncontrolled Keywords: oxidation resistance, polymer precursor, thermodynamics, thermogravimetry
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-215330
Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 11 Department of Materials and Earth Sciences > Material Science
Date Deposited: 01 Jul 2022 11:58
Last Modified: 19 Sep 2022 11:28
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21533
PPN: 499013328
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