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Sintering and Mechanical Properties of Yttria‐Doped Tetragonal ZrO 2 Polycrystal/Mullite Composites
Author(s) -
Ishitsuka Masayuki,
Sato Tsugio,
Endo Tadashi,
Shimada Masahiko
Publication year - 1987
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.1151-2916.1987.tb05653.x
Subject(s) - mullite , materials science , composite material , thermal shock , thermal expansion , sintering , fracture toughness , yttria stabilized zirconia , toughness , tetragonal crystal system , ceramic , cubic zirconia , phase (matter) , chemistry , organic chemistry
Yttria‐doped tetragonal ZrO 2 polycrystal (Y‐TZP)lmullite composites were sintered at 1450° to 1500°C in air to disperse rodlike mullite grains at the grain boundary of Y‐TZP and the mechanical and thermal properties were investigated. The aspect ratios of mullite grain were >2. High fracture strength of 1000 MPa and fracture toughness of 12 MPa·m 1/2 were obtained by dispersing <20 vol% of mullite into Y‐TZP. The thermal expansion coefficient of Y‐TZP/mullite composites decreased with increasing mullite content. The thermal shock resistance of Y‐TZP was greatly improved by dispersion of rodlike mullite grains.