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A Study on the Alumina Ceramic Composite Dispersed With the Zirconia  

Park, Jae-Sung (Dept. of Electronic & Information Engineering, YNC)
Lee, Yeong-Sin (Dept. of Electronic & Information Engineering, YNC)
Publication Information
전자공학회논문지 IE / v.49, no.2, 2012 , pp. 1-8 More about this Journal
Abstract
The effects of the addition of either monoclinic $ZrO_2(pure)$ or tetragonal $ZrO_2$ containing 5.35wt% $Y_2O_3(Y-TZP)$ on the mechanical properties and thermal shock resistance of $Al_2O_3$ ceramics were investigated. The addition of $ZrO_2$(m) and Y-TZP increased sintered density of $Al_2O_3$. The Vickers hardness also increased as the volume fraction of Y-TZP increased going through a maximum at 20wt%. The hardness of the specimens was found to be dependent on the sintered density. The higher volume fraction of either $ZrO_2(m)$ or Y-TZP resulted in the higher fracture toughness of the composite was. This result may be taken as evidence that toughening of $Al_2O_3$ can be achieved by not only the transformation toughening but microcrack toughening of $ZrO_2$. The thermal shock property for $Al_2O_3-ZrO_2$ composites was improved by increasing the volume fraction of monoclinic $ZrO_2(pure)$. The grain size increased as the volume fraction of $ZrO_2$ did.
Keywords
Al2O3-ZrO2; Al2O3-TZP; Alumina; Composite; fracture toughness;
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