| CHUN Dao-yong,WANG Rui-jun,YOU Xiao-ming,HE Qing,ZOU Han,LYU Yu-fen.Sintering Behaviour of Nanocrystalline 8％Yttria Stabilized Zirconia Powders at Various Temperatures[J],45(9):118-125 |
| Sintering Behaviour of Nanocrystalline 8％Yttria Stabilized Zirconia Powders at Various Temperatures |
| Received:March 17, 2016 Revised:September 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.09.019 |
| KeyWord:nanocrystalline 8% yttria stabilized zirconia powders high temperature heat treatment particle size phase transition grain growth activation energy |
| Author | Institution |
| CHUN Dao-yong |
Aircraft Engine Room of the Navy office in Guizhou, Guizhou , China |
| WANG Rui-jun |
Surface Engineering Research Institute, Chinese Academy of Agricultural Mechanization Sciences, Beijing , China |
| YOU Xiao-ming |
Surface Engineering Research Institute, Chinese Academy of Agricultural Mechanization Sciences, Beijing , China |
| HE Qing |
Surface Engineering Research Institute, Chinese Academy of Agricultural Mechanization Sciences, Beijing , China |
| ZOU Han |
Surface Engineering Research Institute, Chinese Academy of Agricultural Mechanization Sciences, Beijing , China |
| LYU Yu-fen |
Surface Engineering Research Institute, Chinese Academy of Agricultural Mechanization Sciences, Beijing , China |
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| Abstract: |
| Objective To obtain the temperature stability of nanocrystalline 8% yttria stabilized zirconia (8YSZ) and prevent the apparent decline of properties of the 8YSZ coating owing to the sintering behavior by investigating the changes of the grain size and the phase composition of the nanocrystalline 8YSZ powders. Methods The nanocrystalline 8YSZ powders with low impurity were prepared by co-precipitation method. Then they were sintered for 3~12 h at 900~1200 ℃ after low temperature calcination. Phase composition and morphology were analyzed by XRD and SEM. The average particle size after heat treatment was calculated by Scherrer formula. Grain growth activation energy was obtained by Arrhenius formula and then the grain growth mechanism was determined. Results Most powders kept amorphous after low temperature calcination pretreatment. After high temperature heat treatment, crystalline state was transformed and the phase of the powders changed to tetragonal. The activation energy was 42.638 kJ/mol at 900~1100 ℃, and 3.849 kJ/mol at 1100~1200 ℃. Conclusion It is primary tetragonal phase after high temperature heat treatment among the nanocrystalline 8YSZ powders which could retain the temperature stability and prevent apparent decline of coating property while the grain growth is controlled by surface diffusion at 900~1200 ℃. |
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