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Sintering Behavior of Gehlenite, Part II. Microstructure and Mechanical Properties
Author(s) -
Jia Dechang,
Kriven Waltraud M.
Publication year - 2007
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.1551-2916.2007.01835.x
Subject(s) - gehlenite , materials science , fracture toughness , ceramic , sintering , composite material , microstructure , fractography , vickers hardness test , indentation , mineralogy , chemistry , phase (matter) , organic chemistry
A self‐toughened gehlenite (2CaO·Al 2 O 3 ·SiO 2 or “C 2 AS”) ceramic with randomly distributed platelet grains was prepared by the organic steric entrapment (PVA) route. The gehlenite ceramic had a density of 2.698–2.875 g/cm 3 , corresponding to a relative density of 90%–96%. The platelet gehlenite grains had an average thickness of 3.6±0.8 μm and a width of 12.9±3.7 μm, respectively, with an average aspect ratio of 3.6. The three‐point bending strength, fracture toughness, and Young's modulus attained were 142.1±12.1 MPa, 2.32±0.12 MPa·m 1/2 , and 108±6.8 GPa, respectively. Fractography as well as Vickers indentation crack propagation profiles showed that crack deflection, crack blunting, and pinning effects due to the randomly distributed platelet grains were considered to be responsible for the good mechanical properties of the gehlenite ceramic.