TY  - JOUR
AU  - Jamin, Christine
AU  - Rasp, Tobias
AU  - Kraft, Torsten
AU  - Guillon, Olivier
TI  - Constrained Sintering of Alumina Stripes on Rigid Substrates: Effect of Substrate Roughness and Coating
JO  - Journal of the American Ceramic Society
VL  - 98
IS  - 12
SN  - 0002-7820
CY  - Oxford [u.a.]
PB  - Wiley-Blackwell
M1  - FZJ-2016-02099
SP  - 3988 - 3995
PY  - 2015
AB  - Micromolding in capillaries has been used to fabricate alumina stripes on smooth (Ra = 0.5 nm) and rough substrates (Ra = 900 nm). Different lateral (10–500 μm) and vertical stripe dimensions (8–27 μm) were used to study the influence of substrate roughness (smooth and rough sapphire) and substrate material (platinum coated and plain sapphire) on sintering behavior. Alumina stripes experience edge delamination during sintering on a rigid substrate independent of substrate roughness. However, enhanced substrate roughness reduced delamination length by half and lowered lateral strains by up to 0.10. Grooves in the rough substrate were found to be responsible for this feature as they act as crack propagation barriers and generate local density minima. Accompanying discrete element simulations revealed a localized triaxial stress state at the grooves of a sinusoidal-shaped substrate interface as the main cause of the density minima. Platinum interlayers also resulted in reduced delamination by 40% in some stripe geometries while density was enhanced by 4% and lateral strains doubled in some geometries. Creep of the metal layer during sintering is thought to be the reason for this seemingly contradictory behavior.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000368076500059
DO  - DOI:10.1111/jace.13799
UR  - https://juser.fz-juelich.de/record/807068
ER  -