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Laser ablation behavior of Cf/SiHfBCN ceramic matrix composites

Luan, Xingang and Yuan, Jia and Wang, Jianqiang and Tian, Min and Cheng, Laifei and Ionescu, Emanuel and Riedel, Ralf (2016):
Laser ablation behavior of Cf/SiHfBCN ceramic matrix composites.
In: Journal of the European Ceramic Society, Elsevier Science Publishing, pp. 3761-3768, 36, (15), ISSN 09552219,
[Online-Edition: http://doi.org/10.1016/j.jeurceramsoc.2016.04.010],
[Article]

Abstract

The behavior of Cf/SiHfBCN composites upon laser ablation was investigated. The evolution of microstructure and phase composition of the composite was studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). It is found that the ablation mechanism and the microstructure evolution are mainly dependent on the local temperature which directly relies on the distance from the laser spot and the thermal conduction of the carbon fibers. Three regions with different ablation behavior are identified. In the center region, bubble-like structures consisting of HfO2, and SiHfxOy-based layers, cover the ends of the carbon fibers which retain their original shape despite their corrosion. Sheets consisting of HfCxOy and SiO2 as well as porous HfO2 and liquid SiO2 are generated in the transition region. The carbon fibers are well protected from oxidation in the two regions. SiO2 is produced and suppresses the further oxidation of the matrix in the fringe region.

Item Type: Article
Erschienen: 2016
Creators: Luan, Xingang and Yuan, Jia and Wang, Jianqiang and Tian, Min and Cheng, Laifei and Ionescu, Emanuel and Riedel, Ralf
Title: Laser ablation behavior of Cf/SiHfBCN ceramic matrix composites
Language: English
Abstract:

The behavior of Cf/SiHfBCN composites upon laser ablation was investigated. The evolution of microstructure and phase composition of the composite was studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). It is found that the ablation mechanism and the microstructure evolution are mainly dependent on the local temperature which directly relies on the distance from the laser spot and the thermal conduction of the carbon fibers. Three regions with different ablation behavior are identified. In the center region, bubble-like structures consisting of HfO2, and SiHfxOy-based layers, cover the ends of the carbon fibers which retain their original shape despite their corrosion. Sheets consisting of HfCxOy and SiO2 as well as porous HfO2 and liquid SiO2 are generated in the transition region. The carbon fibers are well protected from oxidation in the two regions. SiO2 is produced and suppresses the further oxidation of the matrix in the fringe region.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 36
Number: 15
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Laser ablation, Ablation mechanism, Cf/SiHfBCN, UHT CMCs
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Aug 2016 08:33
Official URL: http://doi.org/10.1016/j.jeurceramsoc.2016.04.010
Additional Information:

Preparation and Application of Ultra-high Temperature Ceramic Matrix Composites

Identification Number: doi:10.1016/j.jeurceramsoc.2016.04.010
Funders: The work is supported by the fund of 111 Project (B08040), the State Key Laboratory of Solidification Processing in NWPU (No. 135-QP-2015)., The authors also acknowledge the financial supports from the project supported by State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China and the project sponsored by SRF for ROCS, SEM., JY acknowledges financial support from China Scholarship Council (CSC) during his stay at TU Darmstadt., Financial support from the German Research Foundation (DFG, Bonn, Germany) is gratefully acknowledged.
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