Composite Zircon Ceramics Based on Raw Materials Activated by Ammonium Bifluoride

The results of studies of the synthesis processes of baddeleyite-zircon ceramics based on fluorinated plasmadissociated and natural zircon are presented. It was found that to obtain densely sintered ceramics based on fluorinated natural zircon, the introduction of CaO is required to stabilize free ZrO2 in the composition of the ceramics. The introduction of Y2O3 into the composition of ceramics based on plasma-dissociated zircon makes it possible to reduce the sintering temperature from 1600 to 1500 °C. It is difficult to obtain ceramics based on plasmadissociated zircon with a high degree of fluorination due to the formation of an excessive amount of ZrF4.