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http://dx.doi.org/10.3795/KSME-A.2009.33.7.652

Room Temperature Strength and Crack Healing Morphology of Si3N4 Composite Ceramics with SiO2 Colloidal  

Nam, K.W. (부경대학교 신소재공학부)
Kim, J.S. ((주)엔지텍)
Lee, H.B. (부경대학교 대학원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.33, no.7, 2009 , pp. 652-657 More about this Journal
Abstract
Strength characteristics of $Si_3N_4$ composite ceramics has been studied as functions of heat-treatment temperature and additive $SiO_2$. $SiO_2$ colloidal could significantly increase the bending strength. Crack healing temperature decreased 300 K by additive $TiO_2$. Bending strength of specimen added $SiO_2$ is higher than that of non-added $SiO_2$. Moreover, bending strength of specimen with $SiO_2$ colloidal coating is much higher that of non-coated specimen. In in-situ observation, crack-healed specimen at 1,573 K shows phenomenon like a fog on the surface. By SPM, both crack-healed specimen, non-coating and coating of $SiO_2$ colloidal, at 1,273 K were healed completely but both of 1,573 K exist crack. This was made by evaporation of $SiO_2$ at high temperature. Crack-healing materials of $Si_3N_4$ composite ceramics is crystallized $Y_2Si_2O_7$, $Y_2Ti_2O_7$ and $SiO_2$. A large amount of Si and O, and little C were detected by EPMA. Si and O increase but C decreases according to heat treatment temperature. Specimens with additive $SiO_2$ were more detected Si and O than that of non-additive $SiO_2$. Specimen with $SiO_2$ colloidal coatings were much more detected O.
Keywords
$Si_3N_4$ Composite Ceramics; $SiO_2$ Colloidal; Hybride Binder; In-Situ; Crack-Healing; Morphology;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 1
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