標題: Oxygen diffusivities in mullite/zirconia composites measured by O-18/O-16 isotope exchange and secondary ion mass spectrometry
作者: Ko, Hong-Da
Lin, Chien-Cheng
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-Feb-2008
摘要: Oxygen diffusivities in mullite/zirconia composites were measured by O-18/O-16 isotope exchange and secondary ion mass spectrometry. They exhibited a wide range of values from 10(-21) to 10(-10) m(2)/S at temperatures between 1000 and 1350 C in the composites with 0 to 80 vol% zirconia. At a fixed temperature, oxygen diffusivities m high-zirconia composites were larger by at least eight orders of magnitude than those in low-zirconia composites. The percolation threshold occurred between 30 and 40 vol% zirconia, where oxygen diffusivities dramatically changed. There was a clear tendency of the activation energies of oxygen diffusion in composites to decrease with increasing zirconia contents. The large oxygen diffusivities in the high-zirconia composites were attributed to the interconnected channels of zirconia from the microstructural aspect.
URI: http://dx.doi.org/10.1557/jmr.2008.0073
http://hdl.handle.net/11536/9746
ISSN: 0884-2914
DOI: 10.1557/jmr.2008.0073
期刊: JOURNAL OF MATERIALS RESEARCH
Volume: 23
Issue: 2
起始頁: 353
結束頁: 358
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