High-Temperature Stiffness and Damping Measurements to Monitor the Glassy Intergranular Phase in Liquid-Phase-Sintered Silicon Carbides

Detailed stiffness and internal friction (Q−1) versus temperature curves were obtained for liquid‐phase‐sintered silicon carbides using advanced resonant beam analysis up to 1400°C. As‐sintered materials display a stable Q−1‐peak near 1100°C, superimposed on an increasing background. The change of s...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2005-08, Vol.88 (8), p.2152-2158
Main Authors: Roebben, Gert, Van der Biest, Omer, Sciti, Diletta, Bellosi, Alida, Sarbu, Corneliu, Lauwagie, Tom
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Damping
Exact sciences and technology
Friction
Glass
Miscellaneous
Silicon carbide
Sintering
Structural ceramics
Technical ceramics
Temperature effects
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Description
Summary:Detailed stiffness and internal friction (Q−1) versus temperature curves were obtained for liquid‐phase‐sintered silicon carbides using advanced resonant beam analysis up to 1400°C. As‐sintered materials display a stable Q−1‐peak near 1100°C, superimposed on an increasing background. The change of stiffness associated with the damping peak is quantitatively related to the amount of matter in pockets of the amorphous intergranular phase in which the refractory SiC matrix grains are embedded. The successful removal of the amorphous pockets by annealing at 1900°C is deduced from the disappearance of the damping peak and confirmed with transmission electron microscopy.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2005.00373.x