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Oxidation and Crack Healing Behavior of a Fine‐Grained Cr 2 AlC Ceramic
Author(s) -
Li Shibo,
Xiao Liou,
Song Guiming,
Wu Xiaomin,
Sloof Wim G.,
Zwaag Sybrand
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12170
Subject(s) - microstructure , materials science , ceramic , composite material , oxide , phase (matter) , metallurgy , chemistry , organic chemistry
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.