کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1475081 | 991108 | 2012 | 6 صفحه PDF | دانلود رایگان |
In this paper we present a new route for the realization of crack-free zircon monoliths, at very low temperature (1200 °C). Zircon ceramics are for the first time synthesized from a mixture of preceramic polymers, consisting of silicone resins, filled with active nano-sized fillers, being ZrO2 nano-particles. The introduction of small quantities (up to 10 mol%) of TiO2 as a sintering aid, and of zircon micro-powders, as seeds, has been also considered. The additives demonstrated to be extremely effective in increasing the zircon yield, with a synergistic effect when used together. Moreover, an appropriate mixture of different preceramic polymers as SiO2 source was found to be critical for the obtainment of crack-free monoliths. This simple methodology demonstrated kinetic features comparable to those of sol–gel processes, but coupled with the possibility of an easy shaping of the desired ceramic before heat treatment.
Journal: Journal of the European Ceramic Society - Volume 32, Issue 11, August 2012, Pages 2819–2824