Effect of Doping Aluminum Oxide and Cobalt Oxide on the Mechanical and Optical Properties of Sintered Zirconia
碩士 === 國立臺灣科技大學 === 機械工程系 === 95 === Tetragonal zirconia polycrystal (TZP, ZrO2-3mol%Y2O3) was doped with cobalt oxide (0.5, 1.0, or 1.5 wt％) and aluminum oxide (0.5, 1.0, or 1.5 wt％) by a solution coating method in the powder state. After sintering the pressed specimens in air at 1430 degC, the rel...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/38jaq3 |
| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 95 === Tetragonal zirconia polycrystal (TZP, ZrO2-3mol%Y2O3) was doped with cobalt oxide (0.5, 1.0, or 1.5 wt％) and aluminum oxide (0.5, 1.0, or 1.5 wt％) by a solution coating method in the powder state. After sintering the pressed specimens in air at 1430 degC, the relative density of the sintered specimens could be enhanced for the specimens having the approximately equivalent molar ratios of cobalt oxide and aluminum oxide, due to the formation of a spinel phase. The mechanical properties of the doped TZP were only slightly affected by the dopants. A minor fraction of monoclinic phase of larger grain was induced if the doping concentration of cobalt oxide was higher than that of aluminum oxide, while the grain size of zirconia became slightly smaller if the doping concentration of aluminum oxide was higher than that of cobalt oxide. The color of the doped TZP became dark blue if the concentration of cobalt oxide was high, but became royal blue if the relative abundance of the spinel phase of cobalt oxide and aluminum oxide was high. A high doping concentration of aluminum oxide could reduce the reflection ratio of visible light spectrum.
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