Effect of Nitrogen Atmosphere on the Densification of a 3-mol%-Yttria-Doped Zirconia |
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| Authors: | Yeong-Kyeun Paek Jung-Ho Ahn Gyeung-Ho Kim Suk-Joong L Kang |
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| Affiliation: | Department of Materials Science and Engineering, Andong National University, Andong Kyungbuk 760–749, Korea;Nanomaterials Research Center, Korea Institute of Science and Technology, Seoul 136–791, Korea;Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Taejon 305–701, Korea |
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| Abstract: | The densification behavior of a 3-mol%-Y2O3-doped ZrO2 (3Y-ZrO2) has been investigated under N2 and O2 atmospheres. Powder compacts have been sintered at 1550° and 1400°C for various times. The density of the specimen sintered at 1550°C is higher in N2 than in O2, while the contrary result is obtained in the case of the specimen sintered at 1400°C. Such results can be explained in terms of nitrogen solubility and oxygen vacancy in a ZrO2 matrix. Because nitrogen solubility into the ZrO2 increases with an increase in heat-treatment temperature, leading to the formation of oxygen vacancy, the densification rate becomes higher. The present study thus shows evidence of nitrogen solubility into the ZrO2 and its role on the densification behavior of 3Y-ZrO2. |
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| Keywords: | zirconia: yttria stabilized nitrogen densification phase transformations |
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