Strength recovery behavior of machined Al2O3/SiC nano-composite ceramics by crack-healing

Machined alumina/15 vol% SiC nanocomposites with a semicircular groove were heat treated at various temperatures. The change of the local fracture stress at the bottom of the semicircular groove was investigated as a function of crack-healing temperature and time. By heating at 1400 C at 1 h, the ma...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2007, Vol.27 (10), p.3261-3267
Main Authors: OSADA, Toshio, NAKAO, Wataru, TAKAHASHI, Koji, ANDO, Kotoji, SAITO, Shinji
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Other materials
Physics
Specific materials
Structural ceramics
Technical ceramics
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Summary:Machined alumina/15 vol% SiC nanocomposites with a semicircular groove were heat treated at various temperatures. The change of the local fracture stress at the bottom of the semicircular groove was investigated as a function of crack-healing temperature and time. By heating at 1400 C at 1 h, the machined specimen was fractured not from the cracks introduced by the hard machining but from the other region. Thus, it was concluded that the machining cracks were completely healed by this heat treatment. The strength at room temperature and elevated temperature ( < 1300 C) of the healed machined sample exhibited the same levels as that of the healed polished sample. It can be shown that crack-healing is useful to increase the strength of machined ceramics economically. 23 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2006.11.080