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

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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.
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Document Type: Research Article

Affiliations: 1: National Institute for Materials Physics, Bucharest-Magurele, Romania 2: Department of Metallurgy and Materials Engineering, K. U. Leuven, Belgium 3: CNR-IRTEC, Research Institute for Ceramics Technology, Faenza, Italy 4: Department of Mechanical Engineering, K. U. Leuven, Belgium

Publication date: 01 August 2005

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