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Obtaining complex‐shaped oxide ceramic composites via ionotropic gelation
Author(s) -
Almeida Renato S. M.,
Pereira Tamires F. S.,
Tushtev Kamen,
Rezwan Kurosch
Publication year - 2019
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/jace.15990
Subject(s) - materials science , composite material , ceramic , cubic zirconia , porosity , ceramic matrix composite , fracture toughness , flexural strength , suspension (topology) , toughness , fiber , oxide , metallurgy , mathematics , homotopy , pure mathematics
In this communication, we present a new processing method for obtaining oxide ceramic composites based on the ionotropic gelation technique. Nextel 610 fiber fabrics were infiltrated by an alumina‐zirconia suspension with a total solid content of 50 vol% and alginate as the binder. Subsequently, the suspension was slowly cross‐linked by adding Al 3+ cations and transferred to a gel state. The gelled fabric layers could be easily cut, stacked and shaped, as well as joined to other ceramic materials and composites. Furthermore, the fiber content could be adjusted by pressing the layers together. In summary, the composites produced with this technique presented a very good fiber bundle infiltration, matrix with fine porosity and excellent mechanical properties. Nextel 610/alumina‐zirconia composites sintered at 1200°C for 1 hour showed bending strength of 306 MPa, interlaminar shear strength of 9.8 MPa and nominal fracture toughness of 13.6 MPa m 0.5 .