標題: Reaction between titanium and zirconia powders during sintering at 1500 degrees C
作者: Lin, Kun-Lin
Lin, Chien-Cheng
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-Jul-2007
摘要: Zirconia-titanium (ZrO2-Ti) composites have been considered potential thermal barrier graded materials for applications in the aerospace industry. Powder mixtures of Ti and 3 mol% Y2O3 partially stabilized ZrO2 in various ratios were sintered at 1500 degrees C for 1 h in argon. The microstructures of the as-sintered composites were characterized by X-ray diffraction and transmission electron microscopy/energy-dispersive spectroscopy. Ti reacted with and was mutually soluble in ZrO2, resulting in the formation of alpha-Ti(O, Zr), Ti2ZrO, and/or TiO. These oxygen-containing phases extracted oxygen ions from ZrO2, whereby oxygen-deficient ZrO2 was generated. For relatively small Ti/ZrO2 ratios, specimens with <= 30 mol% Ti, TiO were formed as oxygen could be sufficiently supplied by excess ZrO2. For the specimens with >= 50 mol% Ti, lamellar Ti2ZrO was precipitated in alpha-Ti(Zr, O), with no TiO being found. Both m-ZrO2-x and t-ZrO2-x were found in specimens with <= 50 mol% Ti; however, only c-ZrO2-x was formed in the specimen with 70 mol% Ti. As ZrO2 was gradually dissolved into Ti, yttria was retained in ZrO2 because of the very limited solubility of yttria in alpha-Ti(O, Zr) or TiO. The concentration of retained yttria and the degree of oxygen deficiency in ZrO2 increased with the Ti content. The complete dissolution of ZrO2 into Ti was followed by the precipitation of Y2Ti2O7 in the specimen with 90 mol% Ti.
URI: http://dx.doi.org/10.1111/j.1551-2916.2007.01708.x
http://hdl.handle.net/11536/10656
ISSN: 0002-7820
DOI: 10.1111/j.1551-2916.2007.01708.x
期刊: JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume: 90
Issue: 7
起始頁: 2220
結束頁: 2225
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