Article

Oxidation and Crack Healing Behavior of a Fine‐Grained <scp> <scp>Cr</scp> </scp> <sub>2</sub> <scp> <scp>AlC</scp> </scp> Ceramic

Shibo LiCenter of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044 ChinaLiou XiaoCenter of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing 100044 ChinaGuiming SongDepartment of Materials Science and Engineering Delft University of Technology Mekelweg 2 Delft 2628 CD The NetherlandsXiaomin WuFaculty of Aerospace Engineering Delft University of Technology Kluyverweg 1 Delft 2629 HS The NetherlandsWim G. SloofDepartment of Materials Science and Engineering Delft University of Technology Mekelweg 2 Delft 2628 CD The NetherlandsSybrand van der ZwaagFaculty of Aerospace Engineering Delft University of Technology Kluyverweg 1 Delft 2629 HS The Netherlands

2013en

ABI

Abstract

This work reports the oxidation and crack healing behavior of a fine‐grained (~2 μm) Cr 2 AlC MAX phase ceramic. The oxidation behavior was investigated in the temperature range 900°C–1200°C for times up to 100 h. The material showed a good oxidation resistance, owing to the formation of a dense and thin α‐ Al 2 O 3 layer. The microstructure, composition and thickness of the oxide scale were characterized. Its oxidative crack healing behavior as a function of temperature, healing time, and initial crack size was studied systematically. The material showed excellent healing behavior. The main crack healing mechanism is the filling of the crack by oxides well adhering to the crack faces. The crack geometry before and after healing was characterized by X ‐ray tomography. Three‐point bend tests showed the dependence of strength recovery at 1100°C as a function of initial crack length and healing time.

Identifiers

DOI: 10.1111/jace.12170

Citations and references

Cited by 20 references

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