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Significant improvement of high-temperature oxidation resistance of HfC/SiC ceramic nanocomposites with the incorporation of a small amount of boron

Wen, Qingbo and Yu, Zhaoju and Riedel, Ralf and Ionescu, Emanuel (2020):
Significant improvement of high-temperature oxidation resistance of HfC/SiC ceramic nanocomposites with the incorporation of a small amount of boron.
In: Journal of the European Ceramic Society, (10), 40. Elsevier, pp. 3499-3508, ISSN 0955-2219, e-ISSN 1873-619X,
DOI: 10.1016/j.jeurceramsoc.2020.03.067,
[Online-Edition: https://www.sciencedirect.com/science/article/abs/pii/S09552...],
[Article]

Abstract

Oxidation behavior of boron-containing HfC/SiC nanocomposites (SHBC) at temperatures up to 1500 degrees C and with exposure time up to 100 h was investigated. Two strategies to improve the oxidation resistance of the HfC/SiC ceramics are proposed. First concept involves the incorporation of a small amount of boron (ca. 0.6 wt.%) into the nanocomposite via a single-source-precursor approach, which contributes significantly to the enhancement of its oxidation resistance. Parabolic oxidation rate constants of 10(-3) to 10(-4) mg2/(cm(4) h) at 1300 - 1500 degrees C were measured for SHBC and were several orders of magnitude lower than those recorded for boron-free HfC/SiC. The second improvement concept is realized via passivation of the samples upon short-term oxidation at 1400 degrees C, providing an excellent oxidation resistance over a wide temperature range. This is a crucial step especially when considering the poor oxidation behavior of HfC and the sluggish formation of protective silica scale at moderate temperatures.

Item Type: Article
Erschienen: 2020
Creators: Wen, Qingbo and Yu, Zhaoju and Riedel, Ralf and Ionescu, Emanuel
Title: Significant improvement of high-temperature oxidation resistance of HfC/SiC ceramic nanocomposites with the incorporation of a small amount of boron
Language: English
Abstract:

Oxidation behavior of boron-containing HfC/SiC nanocomposites (SHBC) at temperatures up to 1500 degrees C and with exposure time up to 100 h was investigated. Two strategies to improve the oxidation resistance of the HfC/SiC ceramics are proposed. First concept involves the incorporation of a small amount of boron (ca. 0.6 wt.%) into the nanocomposite via a single-source-precursor approach, which contributes significantly to the enhancement of its oxidation resistance. Parabolic oxidation rate constants of 10(-3) to 10(-4) mg2/(cm(4) h) at 1300 - 1500 degrees C were measured for SHBC and were several orders of magnitude lower than those recorded for boron-free HfC/SiC. The second improvement concept is realized via passivation of the samples upon short-term oxidation at 1400 degrees C, providing an excellent oxidation resistance over a wide temperature range. This is a crucial step especially when considering the poor oxidation behavior of HfC and the sluggish formation of protective silica scale at moderate temperatures.

Journal or Publication Title: Journal of the European Ceramic Society
Number: 10
Publisher: Elsevier
Uncontrolled Keywords: Polymer-derived ceramic nanocomposites; High-temperature oxidation; Silicon carbide; Hafnium carbide; UHTCs DIBORIDE-SILICON-CARBIDE; ZIRCONIUM DIBORIDE; HAFNIUM CARBIDE; ZRB2-SIC COMPOSITES; C/C COMPOSITES; BEHAVIOR; CARBON; KINETICS; PRECURSOR; ADDITIONS
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 14 May 2020 06:11
DOI: 10.1016/j.jeurceramsoc.2020.03.067
Official URL: https://www.sciencedirect.com/science/article/abs/pii/S09552...
Projects: Technische Universitat Darmstadt, National Natural Science Foundation of China, Grant Number 51872246, Alexander von Humboldt Foundation, German Research Foundation (DFG), Grant Number IO 64/14-1
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