Influence of the zirconia transformation on the thermal behavior of zircon-zirconia composites
作者： Nicolas M. Rendtorff , Gustavo Suarez , Yoshio Sakka , Esteban F. Aglietti
DOI: 10.1007/S10973-011-1906-X
关键词: Tetragonal crystal system 、 Materials science 、 Ceramic 、 Composite material 、 Ceramic matrix composite 、 Monoclinic crystal system 、 Cubic zirconia 、 Thermal expansion 、 Endothermic process 、 Diffusionless transformation
摘要: During a heating–cooling cycle, zirconia (ZrO2) undergoes martensitic transformation from monoclinic to tetragonal structure phases, which presents special hysteresis loop in the dilatometry curve at temperatures between 800 and 1100 °C. Monoclinic (m-ZrO2) particles reinforced ceramic matrix composites not always present this behavior. In order elucidate fact series of zircon–zirconia (ZrSiO4–ZrO2) have been obtained by slip casting characterized. The final properties were also correlated with content (0–30 vol.%). influence (m–t) well-dispersed grains composite on thermal behavior was analyzed. Thermal evaluation carried out; correlation expansion coefficients showed deviation mixing rule applied. A observed reversible dilatometric enough (≥10 vol.%). Over threshold is area. evaluated addition. When detected m–t temperature slightly influenced (due previously decrease material stiffness) similar reported literature. reverse (cooling) strongly decreased matrix. DTA results are consistent analysis, but technique more reliable results. Particularly endothermic be easily even when only m-ZrO2 product slight dissociation zircon during processing pure material.
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