| Title |
Fabrication and Physical Properties of ZrO₂(m)-Al₂O₃/ZrO₂(t)-Al₂O₃ Structural Ceramics |
| Authors |
Jae-Sung Park ; Ju-Tae Park ; Jung-Rang Park |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2010.24.4.140 |
| Keywords |
Monoclinic ; Tetragonal ; Electrical Conductivity ; Sintered Density ; Vickers Hardness ; Thermal Shock |
| Abstract |
The effects of the addition of either monoclinic ZrO₂(ZrO₂(m)) or tetragonal ZrO₂(ZrO₂(t)) containing 5.35[wt%] Y₂O₃ on the physical properties and electrical conductivity of Al₂O₃ were investigated. The addition of ZrO₂(m) and ZrO₂(t) increased sintered density of Al₂O₃. The Vickers hardness also increased as addition of ZrO₂(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 ZrO₂(t) improved the hardness of Al₂O₃-ZrO₂ systems and the ZrO₂(m) addition showed the better effect on the thermal shock property of Al₂O₃-ZrO₂ systems than that of the ZrO₂(t) addition. Above 15[wt%] addition of ZrO₂(t), the electrical conductivity is gradually increased with increasing applied voltage but not effects by addition of ZrO₂(m). |