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http://dx.doi.org/10.5207/JIEIE.2010.24.4.140

Fabrication and Physical Properties of ZrO2(m)-Al2O3ZrO2(t)-Al2O3 Structural Ceramics  

Park, Jae-Sung (영남이공대학 전자정보계열)
Park, Ju-Tae (영남이공대학 전자정보계열)
Park, Jung-Rang (영남이공대학 전자정보계열)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.24, no.4, 2010 , pp. 140-148 More about this Journal
Abstract
The effects of the addition of either monoclinic $ZrO_2(ZrO_2(m))$ or tetragonal $ZrO_2(ZrO_2(t))$ containing 5.35[wt%] $Y_2O_3$ on the physical properties and electrical conductivity of $Al_2O_3$ were investigated. The addition of $ZrO_2$(m) and $ZrO_2$(t) increased sintered density of $Al_2O_3$. The Vickers hardness also increased as addition of $ZrO_2$(t) increased going through a maximum at 20[wt%] and the hardness of the specimens was found to be dependent on the sintered density. The addition of $ZrO_2$(t) improved the hardness of $Al_2O_3-ZrO_2$ systems and the $ZrO_2$(m) addition showed the better effect on the thermal shock property of $Al_2O_3-ZrO_2$ systems than that of the $ZrO_2$(t) addition. Above 15[wt%] addition of $ZrO_2$(t), the electrical conductivity is gradually increased with increasing applied voltage but not effects by addition of $ZrO_2$(m).
Keywords
Monoclinic; Tetragonal; Electrical Conductivity; Sintered Density; Vickers Hardness; Thermal Shock;
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