Chevalier Jérôme, Deville Sylvain, Münch Etienne, Jullian Romain, Lair Frédéric
Department of Research into the Metallurgy and Physical Properties of Materials, National Institute of Applied Sciences, Associate Research Unit 5510, 69621 Villeurbanne Cedex, France.
Biomaterials. 2004 Nov;25(24):5539-45. doi: 10.1016/j.biomaterials.2004.01.002.
The isothermal tetragonal-to-monoclinic transformation of 3Y-TZP ceramics sintered at two different temperatures (1450 degrees C and 1550 degrees C) and duration (2 and 5h) is investigated at 134 degrees C in steam. Particular attention is paid to the presence of a cubic phase and its effect on isothermal aging. Sintering at 1550 degrees C can result in a significant amount of large cubic grains in the specimens, that have a detrimental impact on aging resistance, especially for the first stage of the aging process. Cubic grains appear to be enriched in yttrium, which in turn leads to a depletion of yttrium in the neighboring tetragonal grains. These grains will act as nucleation sites for tetragonal-to-monoclinic transformation. Even for specimens sintered at lower temperature, i.e. 1450 degrees C, the presence of a cubic phase is expected from the phase diagram, leading to a significant effect on aging sensitivity.
研究了在134℃蒸汽环境下，在两种不同温度（1450℃和1550℃）以及不同时长（2小时和5小时）烧结的3Y-TZP陶瓷的等温四方相向单斜相转变。特别关注立方相的存在及其对等温时效的影响。在1550℃烧结会导致试样中出现大量大尺寸立方晶粒，这对耐老化性有不利影响，尤其是在时效过程的第一阶段。立方晶粒似乎富含钇，这反过来又导致相邻四方晶粒中的钇耗尽。这些晶粒将作为四方相向单斜相转变的形核位点。即使对于在较低温度（即1450℃）烧结的试样，根据相图预计也会存在立方相，从而对时效敏感性产生显著影响。
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