Effects of Monoclinic ZrO₂ with Different Particle Size on Properties of Zirconia Refractories

Abstract:

The zirconia refractories were prepared using partially stabilized zirconia grain and monoclinic zirconia powder as the matrix, partially stabilized zirconia particles as the aggregate, and phenolic resin as the binder, and four sizes of monoclinic zirconia powder (D₅₀=1 μm, 3 μm, 6 μm, 10 μm) were used as additives. Besides, an improved specimen was prepared using a specific monoclinic zirconia powder as additive. Properties of specimens with different sizes of m-ZrO₂ powders were researched, including apparent porosity, bulk density, cold modulus of rupture, pore size distribution. Moreover, phase composition and microstructure were analyzed. The results show that, particle size of monoclinic zirconia powders greatly affect the sintering of materials. The specimens with finer m-ZrO₂ powder have lower porosity, higher bulk density and cold modulus of rupture, and the grain boundaries of zirconia particles were fuzzy, showing that the matrix of the specimens were almost sintered completely. While in specimens using coarser m-ZrO₂ powder, the grain boundaries of zirconia particles were clear, showing that the matrix of the specimens were not sintered completely.. Though finer monoclinic zirconia powder promoted the sintering of materials in the test, it had negative impact on the microporus structure, for large pores were observed in the specimen with fine m-ZrO₂ powder. Finally, the improved specimen with promoted sintering and optimized microstructure as well as phase composition was obtained by using specific monoclinic zirconia powder as additive.

• Periodical: Advanced Materials Research (Volumes 335-336)
• Pages: 721-727
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.335-336.721
• Online since: September 2011
• Authors: Hong Gang Sun, Shuang Zhi Yan, Peng Tao Li, Qing Hua Tan, Ai Jun Wu
• Keywords: Microstructure, Monoclinic Zirconia, Particle Size, Pore Size Distribution, Porous Microstructure, Zirconia Refractories

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