https://scholars.lib.ntu.edu.tw/handle/123456789/74254
Title: | Dissolution of Yttrium Ions and Phase Transformation of 3Y-TZP Powder in Aqueous Solution | Authors: | Ho, Fang-Yuan Wei, Wen-Cheng J. |
Issue Date: | 1999 | Journal Volume: | 82 | Journal Issue: | 6 | Start page/Pages: | 1614-1616 | Source: | Journal of the American Ceramic Society | Abstract: | In order to understand the reactions of yttria-containing zirconia powder in aqueous solution, the dissolution behavior of yttrium and the formation of the monoclinic (m) phase of the Y-TZP powder were investigated. The tests were conducted in aqueous solution at temperatures up to 95°C. The results showed that the reaction order of yttrium dissolution from the surface of TZP powder is 5-9, and the activation energy is about 8.4 kJ/mol. However, the value of the reaction order is different from that (0.96-1.20) of the formation of m-phase. However, the yttrium dissolution of the slurries with the addition of 2 mol% dispersant (D-134) was reduced greatly to an extremely low (<2 ppm) level up to 24 h at the testing temperatures. The results also showed that the amounts of m-phase formation were nearly the same for the powders in the slurries with or without D-134 addition. The decrease of yttrium content in the presence of D-134 and the formation of the m-phase of the TZP powder were not closely related. The degradation mechanism, or the formation of m-phase, should not be directly related to the dissolution of yttrium ions from a zirconia surface. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/95369 https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032625273&doi=10.1111%2fj.1151-2916.1999.tb01971.x&partnerID=40&md5=0d5e591f2468923111f2ffe39d2aff4d |
ISSN: | 00027820 | SDG/Keyword: | Activation energy; Ceramic materials; Dissolution; Phase transitions; Powders; Solutions; Surfaces; X ray diffraction analysis; Yttrium; Monoclinic phase; Yttria containing zirconia; Zirconia |
Appears in Collections: | 材料科學與工程學系 |
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