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The present paper concerns the mechanical characterization of calcium aluminate cement and sand tapes prepared by tape casting, including ultrasonic measurements of Young's modulus at high temperature and evaluation of four point flexural behavior after heat treatments in the range of 20 to 1400 deg C. It is shown that dehydration strongly affects mechanical properties in the 400 to 900 deg C range, but that treatments at temperatures higher than 1200 deg C increase both Young's modulus and strength. By correlation with thermal and X-ray diffraction analyses, the evolutions of thermomechanical properties have been related to phase and microstructural changes when heating the material after hydration: conversion of hydrates and dehydration at low temperature, then, crystallization of C-A and C-A-S phases and finally sintering at the highest temperatures. In a last part, it is shown that the reinforcement by glass fibres enhances the mechanical properties, in particular in the temperature range of dehydration, and gives to the material a non-brittle behavior.
The present paper concerns the mechanical characterization of calcium aluminate cement and sand tapes prepared by tape casting, including ultrasonic measurements of Young's modulus at high temperature and evaluation of four point flexural behavior after heat treatments in the range of 20 to 1400 deg C. It is shown that dehydration strongly affects mechanical properties in the 400 to 900 deg C range, but that treatments at temperatures higher than 1200 deg C increase both Young's modulus and strength. By correlation with thermal and X-ray diffraction analyses, the evolutions of thermomechanical properties have been related to phase and microstructural changes when heating the material after hydration: conversion of hydrates and dehydration at low temperature, then, crystallization of C-A and C-A-S phases and finally sintering at the highest temperatures. In a last part, it is shown that the reinforcement by glass fibres enhances the mechanical properties, in particular in the temperature range of dehydration, and gives to the material a non-brittle behavior.
Thermomechanical characteristics of calcium aluminate cement and sand tapes prepared by tape casting
Thermomechanische Charakterisierungen von Calciumaluminatzement und Sandbändern, hergestellt durch Bandgießen
Journal of the European Ceramic Society ; 26 ; 3799-3808
2006
10 Seiten, 16 Bilder, 2 Tabellen, 10 Quellen
Article (Journal)
English
Calciumaluminatbinder , Zement , Sand , Band (Werkstoffkunde) , Bandgießen , Ultraschall , Young-Modul , Hochtemperatur , Biegeversuch , Wärmebehandlung (Materialbearbeitung) , Dehydratation , Biegefestigkeit , Röntgenbeugung , Differenzialthermoanalyse , Phasenzusammensetzung , Mikrogefüge , Hydratisieren , Kristallisation , Glasfaser , Verstärkung (Festigkeit) , Rasterelektronenmikroskopie
Calcium Aluminate Cement and Porcelain
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