Fused calcium zirconate for refractory applications
Fused calcium zirconate for refractory applications
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DOI：
10.1016/j.jeurceramsoc.2013.07.008
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发表时间：
2013-12
影响因子：
5.7
通讯作者：
S. Schafföner;C. Aneziris;H. Berek;J. Hubálková;A. Priese
中科院分区：
文献类型：
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作者：
S. Schafföner;C. Aneziris;H. Berek;J. Hubálková;A. Priese
本文研究了电弧熔炼法制备致密CaZrO_3，并与固相合成CaZrO_3进行了比较。熔融CaZrO 3的孔隙率明显低于固态合成材料，但由于电弧熔炼过程中部分CaO的蒸发，CaO/ZrO 2的化学计量比略小于1，形成了立方相ZrO 2作为第二相。为了确定局部相分布，除了积分XRD之外，还用EBSD研究了材料。陶瓷的振动抛光产生了优异的EBSD图案。熔融材料的模压圆柱体导致低至14.3%的孔隙率。从25 °C到1000 °C的线性热膨胀系数为10.45 × 10− 6 K −1。较大坩埚的冷等静压导致15.9- 16.5%的较高孔隙率。EBSD分析和冷等静压坩埚可用于钛熔体的腐蚀试验。
This article investigates dense CaZrO3produced by electric arc melting and compares it to solid state synthesized CaZrO3. The fused CaZrO3had a considerable lower porosity than the solid state synthesized material, however due to evaporation of some CaO during the electric arc melting the stoichiometric ratio of CaO/ZrO2was slightly smaller than one, resulting in the formation of cubic ZrO2as a second phase. To determine the local phase distribution the materials were investigated with EBSD in addition to integral XRD. The vibration polishing of the ceramics resulted in excellent EBSD patterns. Die pressed cylinders of the fused material led to a porosity as low as 14.3%. The linear thermal expansion coefficient from 25 °C to 1000 °C was 10.45 × 10−6K−1. The cold isostatic pressing of larger crucibles resulted in higher porosity of 15.9–16.5%. The EBSD analysis and the cold isostatic pressed crucibles can be applied in corrosion tests for titanium melts.