THEORY, PRODUCTION TECHNOLOGY, AND PROPERTIES OF POWDERS AND FIBERS

The effect of mineralizing agent AlF₃on microstructural rebuilding and phase transformation that occurs during heat treatment in the range 600–1000°C for powder of the composition ZrO₂― 7 mole% CeO₂― 1 mole% Y₂O₃is studied. The original nanocrystalline powder is prepared by high-temperature hydrolysis and sol-gel technology. It is established that during heat treatment there is decomposition of the solid solution based on T-ZrO₂by a eutectoid reaction with formation of M-ZrO₂and Ce₂Zr₃O₁₀.The compound Ce₂Zr₃O₁₀is retained under these conditions at 1000°C. Anisotropic crystals of different chemical composition (M-ZrO₂, Ce₂Zr₃O₁₀, α-Al₂O₃)form within the sintered matrix of a solid solution based on T-ZrO₂.