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In Situ Synthesis of Yttria‐Stabilized Tetragonal Zirconia Polycrystal Powder Containing Dispersed Titanium Carbide by Selective Carbonization
Author(s) -
Liu Jifu,
Li Jianbao,
Wang Houliang,
Huang Yong
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb01970.x
Subject(s) - carbonization , materials science , yttria stabilized zirconia , carbide , cubic zirconia , tetragonal crystal system , chemical engineering , coprecipitation , titanium , carbon fibers , powder diffraction , zirconium carbide , sintering , nuclear chemistry , metallurgy , composite material , ceramic , crystal structure , crystallography , scanning electron microscope , chemistry , composite number , engineering
Reaction thermodynamics was utilized to analyze the selective carbonization conditions of ZrO 2 ‐TiO 2 ‐Y 2 O 3 ultrafine powder and to define the temperature range of the selective carbonization. The ZrO 2 ‐TiO 2 ‐Y 2 O 3 powder was prepared by coprecipitation from a solution containing Zr 4+ , Ti 4+ , and Y 3+ . The powder was selectively carbonized at 1350°, 1450°, 1550°, and 1650°C, respectively, for 2 h under argon atmosphere with sucrose as the carbon source. The resulting product was analyzed by X‐ray diffraction. The experimental results indicated that the ZrO 2 ‐TiO 2 ‐Y 2 O 3 powder could be selectively carbonized in situ at 1450°C to form a carbonized powder which was composed of TiC and t ‐ZrO 2 . It was also found that zirconium carbide could be formed at 1550°C, which is much lower than the carbonization temperature of ZrO 2 defined by thermodynamics.