|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||219 Alumina/Silicon Carbide Nanocomposites: Microwave Sintering
||Argos Yoneda Colletti, Ruth H. G. A. Kiminami , Guido Link
|On-Site Speaker (Planned)
||Ruth H. G. A. Kiminami
Microwave processing of ceramics has gained much attention during last decades. Reasons for the growing interest in the use of microwave energy include rapid heating, enhanced densification and improved microstructure. The microwave sintering of Al2O3/SiC nanocomposites was studied. Basically, this study used mixtures of commercial Al2O3 and up to 5 wt% SiC powders from Sumitomo company. To improve the dispersion of the SiC powder, it was ultrasonically dispersed and freeze dried. The isostatically pressed powder samples were sintered in a 30 GHz microwave furnace by variation of process parameters. Sintered densities were measured using the Archimedes method, X-ray diffraction was used to check for the presence of extra phases and SEM to investigate the microstructures. Vickers hardness was determined in all samples. Only two hours at 1750ºC was necessary to produce 97% dense nanocomposites in a microwave and the Vickers hardness was improve with the addition of SiC.