Hot pressing of nanocrystalline zinc oxide compacts: Densification and grain growth during sintering |
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Authors: | Mehdi Mazaheri S.A. Hassanzadeh-TabriziS.K. Sadrnezhaad |
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Affiliation: | Materials and Energy Research Center, P.O. Box: 14155-4777, Tehran, Iran |
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Abstract: | Sintering behavior of nanocrystalline zinc oxide (ZnO) powder compacts using hot pressing method was investigated. The sintering conditions (temperature and total time) and results (density and grain size) of two-step sintering (TSS), conventional sintering (CS) and hot pressing (HP) methods were compared. The HP technique versus CS was shown to be a superior method to obtain higher final density (99%), lower sintering temperature, shorter total sintering time and rather fine grain size. The maximum density achieved via HP, TSS and CS methods were 99%, 98.3% and 97%, respectively. The final grain size of samples obtained by HP was greater than that of TSS method. However, the ultra-prolonged sintering total time and the lower final density (88 ks and 98.3%) are the drawbacks of TSS in comparison with the faster HP (17 ks and 99%) method. |
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Keywords: | A. Hot press A. Grain growth D. ZnO Densification |
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