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- DAI Wenbin
- School of Materials and Metallurgy, Northeastern University
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- WANG Xinli
- School of Materials and Metallurgy, Northeastern University
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- ZHAO Peng
- School of Materials Science and Engineering, University of Science and Technology Liaoning
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- ZHAO Lin
- China First Heavy Industries
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- YU Jingkun
- School of Materials and Metallurgy, Northeastern University
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抄録
The microstructure of 1 mol % calcia-doped yttria under different sintering condition was investigated, and the thermal shock resistance of yttria with and without additive was compared in present work. The results showed that by adding 1 mol % calcia, the sinterability of yttria is greatly improved and the sample can be sintered as low as 1300°C. Increasing heating temperature and prolonging soaking time are beneficial to form coarse grains with lots of closed pores in calcia-added sample at temperatures higher than 1500°C. By theoretical analysis, it is known that because of the solid solution of Ca2+, defects are generated in the yttria lattice, and the activation energy for diffusion is decreased. Therefore, the grain boundary mobility of yttria is accelerated and closed pores are left inside coarse grains when pores cannot move with yttria grain boundaries anymore. The water quench test reveals that the non-additive sample heated at 1500°C has the highest thermal shock resistance and it cannot be utilized under high temperature in industry. On the contrary, the calcia-doped sample has superior thermal shock resistance by the effect of closed pores, and it might be utilized to melt and cast high purity titanium and its alloys through vacuum induction melting (VIM) process.
収録刊行物
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 119 (1388), 314-318, 2011
公益社団法人 日本セラミックス協会
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詳細情報 詳細情報について
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- CRID
- 1390282680262695424
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- NII論文ID
- 130000662364
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- NII書誌ID
- AA12229489
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- ISSN
- 13486535
- 18820743
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- NDL書誌ID
- 11033486
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可