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Microstructure and mechanical behavior of TiO₂-MnO-doped alumina/alumina laminates
Citation Link: https://doi.org/10.15480/882.3178
Publikationstyp
Journal Article
Date Issued
2021
Sprache
English
TORE-DOI
TORE-URI
Volume
104
Issue
2
Start Page
1047
End Page
1057
Citation
Journal of the American Ceramic Society 2 (104): 1047-1057 (2021)
Publisher DOI
Scopus ID
Publisher
Wiley-Blackwell
Tapes of TiO2-MnO-doped alumina (d-Al2O3) and pure alumina (Al2O3) were shaped via tape casting. Laminates with three different layer numbers and respective thicknesses were produced and sintered at 1200°C. The microstructure and mechanical behavior of laminates were investigated and compared to the respective monolithic references (d-Al2O3 and Al2O3). The use of dopants in alumina decreased the initial sintering temperature, leading to higher densification at 1200°C (~98% theoretical density (TD)) when compared to Al2O3 (~73% TD). The higher density was reflected in a higher Young's modulus and hardness for doped alumina. A region of diffusion of dopants in pure alumina layers was observed along the interface with doped layers. The mechanical strength of d-Al2O3 samples sintered at 1200°C was not statistically different from Al2O3 samples sintered at 1350°C. The strength of laminates composed of doped layers with undoped, porous interlayers did not change. Nevertheless, as the thickness of these porous interlayers increases, a loss of strength was observed. Monolithic references showed constant values of fracture toughness (KIC), ~2 MPa·m1/2, and linear crack path. On the other hand, KIC of laminates increases when the crack propagates from weak Al2O3 layers to dense d-Al2O3 layers.
Subjects
alumina laminates
laminate design
mechanical strength
R-curve
DDC Class
600: Technik
Publication version
publishedVersion
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