Mechanical and Physico-Chemical Characterization of Ceramic-Metal Composites (Kaolinite-Aluminium)


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Abstract


The present work focuses on the study of the process of preparation and characterization of ceramic–metal composites. All the samples have been prepared from Kaolin and Aluminium powder. According to the study, it is shown that the experimental conditions revealed the effect on the mechanical properties and microstructure of composites: (the strength pressure, the percentage Aluminium doped on the Kaolinitic matrix and the sintering temperature). Sintered products are characterized by Electron Scanning Microscopy (SEM), MAS-NMR, X-Ray diffraction, Infrared Spectroscopy (IR); these have revealed the formation of new phases such as Silicon (Si), Corundum (α-Al2O3) and Mullite. The results of mechanical characterization have shown that the composites are hard and tenacious. Moreover, compression resistance of the composites is 6 times higher than that of the Kaolin sintered in the same conditions. Indeed, the flexural strength measured at room temperature is found to fall as Aluminium percent is decreased. Microstructure of the sintered also depends on the Kaolin/Aluminium ratio
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Keywords


Composites; Mechanical and Physico-Chemical Properties; Microstructure; Nuclear Magnetic Resonance (NMR); Sintering

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