Preparation of zirconia granules with a low molecular weight dispersant
| Autor: | Fariba Zerafati, Hudsa Majidian, Leila Nikzad |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Processing and Application of Ceramics, Vol 14, Iss 2, Pp 154-160 (2020) |
| Druh dokumentu: | article |
| ISSN: | 1820-6131 2406-1034 |
| DOI: | 10.2298/PAC2002154Z |
| Popis: | In the present work, different conditions, such as PVA content as a high molecular weight polymer, Dolapix CE64 level with a lower molecular weight and pH adjusted by HCl, were investigated for the preparation of the yttria-stabilized zirconia (YSZ) granules from nanosized YSZ particles. It was found that the suspension prepared at pH = 4 and with 0.1 wt.% Dolapix CE64 has a reasonable value of viscosity for spray drying. The morphology of granules and their cross-sections were characterized through microstructural observation. The flowability of the prepared granules and the Hausner ratio were also evaluated. The results indicated that the addition of only 0.1 wt.% of PVA binder and the use of Dolapix can produce the YSZ granules with good flowability. Replacement of PAA by Dolapix has the benefits of achieving uniform granules with a dense shell layer, decreasing the amount of binder and accelerating the feeding rate of suspensions. The mechanism of the solid and hollow granule formation by a low molecular weight dispersant was suggested. |
| Databáze: | Directory of Open Access Journals |
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