Preparation of Yttria with Elongated Grains and Micro-Pores

Abstract:

The effect of 1mol% calcia additive on sintering of yttria was investigated, and a yttria with elongated grains and micro-pores was developed in present work. The results showed that in calcia added samples heated at 1600°C, calcia contained yttria solid solution grains were formed and distributed among pure yttria grains. With the prolonging soaking time, they were concentrated into rod- or plate-like elongated grains and some of them were embedded into pure coarse yttria grains. Furthermore, in calcia added samples, grain growth was much faster and lots of micro-pores were left in coarse pure yttria grains. Water quench test revealed that thermal shock resistance of calcia added sample was greatly improved by elongated grains and micro-pores.

• Periodical: Advanced Materials Research (Volumes 197-198)
• Pages: 425-428
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.197-198.425
• Online since: February 2011
• Authors: Wen Bin Dai, Xin Li Wang, Peng Zhao, Jing Kun Yu
• Keywords: Calcia, Elongated Grains, Micro-Pore, Thermal Shock Resistance, Yttria

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