Sic纤维补强微晶玻璃复合材料显微结构研究

STUDIES ON THE MICROSTRUCTURE OF SiC FIBER REINFORCED GLASS-CERAMIC COMPOSITE

Mother glass of Li_2O-CaO-Al_2O_3-SiO_2 system glass-ceramic was used as the "precursor" for preparing SiC fiber reinforced composite. Introducing MgO to bind with the precursor, the mixture was sintered so as to form glass-ceramic matrix of composite.Such procedure can be used to adjust the expansion coefficient of the matrix, matching with the SiC fibers in composite. Xray diffraction analysis was carried out to identify the phases existing in the matrix and the microstructure was examined by TEM from replica. The morphology of the fractured surface was inspected by SEM. Based on the studies of microsturcture, an interpretation on the mechanical properties of the composite was given, then, the results were discussed. The experimental results were beneficial to the improvement of technology for the production of the composite, thus, a composite with excellent properties may be expected.