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Solid-Solution Effects on the High-Temperature Oxidation Behavior of Polymer-Derived (Hf,Ta)C/SiC and (Hf,Ti)C/SiC Ceramic Nanocomposites

Wen, Qingbo ; Riedel, Ralf ; Ionescu, Emanuel (2019)
Solid-Solution Effects on the High-Temperature Oxidation Behavior of Polymer-Derived (Hf,Ta)C/SiC and (Hf,Ti)C/SiC Ceramic Nanocomposites.
In: Advanced Engineering Materials, 21 (5)
doi: 10.1002/adem.201800879
Article, Bibliographie

Abstract

In the present study, two concepts to improve the oxidation resistance at high‐temperatures of ceramic nanocomposites consisting of 85–90 vol% SiC, 5–8 vol% group IV metal carbides (i.e., HfC, TaC), and 5–7 vol% carbon are introduced and discussed. First improvement concept relates to the passivation of the samples upon short‐term oxidation at 1400 °C (30 min). This is a critical step, especially with respect to silica formation, which is relatively sluggish at temperatures lower than 1000–1200 °C. Moreover, solid‐solution metal carbides (Hf,Ta)C and (Hf,Ti)C are shown to be clearly more oxidation resistant than the binary HfC and TaC phases. Whereas, the solid‐solution effect contributes to a significant improvement of the short‐term oxidation resistance of the studied nanocomposites, the passivation of the materials prior exposure of high‐temperature oxidation conditions provides a remarkably improved long‐term behavior thereof. Possible mechanisms involved in the oxidation processes of (Hf,Ta)C/SiC and (Hf,Ti)/SiC ceramic nanocomposites are highlighted and critically assessed.

Item Type: Article
Erschienen: 2019
Creators: Wen, Qingbo ; Riedel, Ralf ; Ionescu, Emanuel
Type of entry: Bibliographie
Title: Solid-Solution Effects on the High-Temperature Oxidation Behavior of Polymer-Derived (Hf,Ta)C/SiC and (Hf,Ti)C/SiC Ceramic Nanocomposites
Language: English
Date: May 2019
Publisher: Wiley VCH, Weinheim, Germany
Journal or Publication Title: Advanced Engineering Materials
Volume of the journal: 21
Issue Number: 5
DOI: 10.1002/adem.201800879
URL / URN: https://doi.org/10.1002/adem.201800879
Abstract:

In the present study, two concepts to improve the oxidation resistance at high‐temperatures of ceramic nanocomposites consisting of 85–90 vol% SiC, 5–8 vol% group IV metal carbides (i.e., HfC, TaC), and 5–7 vol% carbon are introduced and discussed. First improvement concept relates to the passivation of the samples upon short‐term oxidation at 1400 °C (30 min). This is a critical step, especially with respect to silica formation, which is relatively sluggish at temperatures lower than 1000–1200 °C. Moreover, solid‐solution metal carbides (Hf,Ta)C and (Hf,Ti)C are shown to be clearly more oxidation resistant than the binary HfC and TaC phases. Whereas, the solid‐solution effect contributes to a significant improvement of the short‐term oxidation resistance of the studied nanocomposites, the passivation of the materials prior exposure of high‐temperature oxidation conditions provides a remarkably improved long‐term behavior thereof. Possible mechanisms involved in the oxidation processes of (Hf,Ta)C/SiC and (Hf,Ti)/SiC ceramic nanocomposites are highlighted and critically assessed.

Uncontrolled Keywords: hafnium carbide, high‐temperature oxidation, passivation, solid solution, ultrahigh‐temperature ceramic nanocomposites
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: 23 Jan 2019 08:10
Last Modified: 29 May 2019 05:17
PPN:
Funders: Financial support from the German Science Foundation (DFG; Bonn, Germany) was gratefully acknowledged., Financial support from the &D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning) and NST (National Research Council of Science & Technology) of Republic of Korea (Grant: CMIP‐13‐4‐KIMS) were gratefully acknowledged.
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