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〈논문〉SiO₂ 콜로이달 첨가에 의한 Si₃N₄ 복합 세라믹스의 Morphology
남기우(K. W. Nam),박승원(S. W. Park),김종순(J. S. Kim),안석환(S. H. Ahn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Surface morphology of Si₃N₄ composite ceramics has been studied as functions of heat-treatment temperature and additive SiO₂. Additive SiO₂ colloidal and SiO₂ colloidal coating on crack could significantly increase the bending strength. Crack healing temperature decreased 300 K by additive TiO₂. Bending strength of specimen with additive SiO₂ is higher than that of non-additive SiO₂. Moreover, bending strength of specimen with SiO₂ colloidal coating is much higher that of non-coating 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 with SiO₂ colloidal, at 1,273 K were healed completely but both of 1,573 K exist crack. This was made by evaporation of SiO₂ at high temperature. Crack-healing materials of Si₃N₄ composite ceramics is crystallized Y₂Si₂O?, Y₂Ti₂O? and SiO₂. A large amount of Si and O, and little C were detected by EPMA. Si and a increase but C decreases according to heat treatment temperature. Specimens with additive SiO₂ were more detected Si and a than that of non-additive SiO₂. Specimen with SiO₂ colloidal coatings were much more detected O.