Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7886232 | Ceramics International | 2018 | 18 Pages |
Abstract
A composite-laminate formed by thick layers (~ 320â¯Âµm) of zirconia-toughened alumina (ZTA) with thin (~ 50â¯Âµm) interlayers of zirconia partially stabilized (Y-PSZ) has been fabricated by tape casting and pressureless sintering. Fracture behavior and strength has been investigated and compared to a “monolithic” reference, e.g. a stack of zirconia-toughened alumina (ZTA) without interlayers. The fracture behavior has been analysed using stable crack growth in V-notched specimens loaded in 3-point bending. The ZTA+Y-PSZ composite laminate presented a rising crack resistance with maximum values between 6 and 14â¯MPaâ¯m1/2. In contrast, the “monolithic” ZTA laminate shows a plateau R-curve behavior at 2.7â¯MPaâ¯m1/2. Several toughening mechanisms were identified in the ZTA+Y-PSZ composite laminate, such as, crack arrest/slow down, micro cracking and bifurcation. These toughening mechanisms are most likely caused by high tensile residual stresses that were estimated theoretically.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Diego Blaese, Tobias Benitez, Marcelo Barros, Hans Jelitto, Nahum Travitzky, Dachamir Hotza, Rolf Janssen,