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http://dx.doi.org/10.3740/MRSK.2005.15.12.780

Crack Healing Behavior with Healing Temperature in Si3N4/SiC Composite Ceramics  

Song, Oh-Sung (Department of Materials Scienced and Engineering, University of Seoul)
Ando, Kotoji (Department of Energy and Safety Engineering, Yokohama National University)
Takahashi, Koji (Department of Energy and Safety Engineering, Yokohama National University)
Nakao, Wataru (Department of Energy and Safety Engineering, Yokohama National University)
Ryu, Ji-Ho (Division of Automobile, Ajou Motor College)
Publication Information
Korean Journal of Materials Research / v.15, no.12, 2005 , pp. 780-785 More about this Journal
Abstract
To investigate the microcrack healing behavior of $Si_3N_4-20wt\%SiC-8wt\%Y_2O_3$ composite ceramics(SNCY8), we observe the crack length evolution a! the time of 20, 40, 60 minutes with in-situ optical microscopy by varying healing temperature of $800\~1200^{\circ}C$. Crack healing obviously occurred as heating temperature and time increased. We proposed a simple model of effective diffusion based on the crack length evolution with healing condition, and determined the effective diffusion coefficient as Our result implies that we may predict the healing ability quantitatively with temperature and time in structural ceramics through the effective diffusion coefficient model.
Keywords
crack healing; healing temperature; diffusion coefficient; surface crack;
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