Production of Ceramics Based on the Y2O3–ZrO2–HfO2 System for Casting Molds

Resumo

The potential of the Y₂O₃–ZrO₂–HfO₂ system for synthesizing the casting mold ceramic of the composition 15 mol % Y₂O₃ : 60 mol % ZrO₂ : 25 mol % HfO₂ was investigated. The effect of technological parameters on the morphology and main properties of ceramic molds produced by investment casting using the ceramic of the above composition was studied, and the basic recommendations for the further development of their production technology were considered. It was determined that a high-refractory casting mold stable to 2773 K can be obtained by conventional investment casting, in which the solid-phase sintering of the ceramic does not rule out the simultaneous combination with the synthesis of the chosen ternary solid solution of the composition 15 mol % Y₂O₃ : 60 mol % ZrO₂ : 25 mol % HfO₂, acting as a high-temperature binder.