OPTIMIZED PREPARATION PARAMETERS OF UNIDIRECTIONALLY C-FIBER-REINFORCED GLASS-CERAMICS OF THE SYSTEMS MAS AND BMAS

For reinforcement with high strength C fibres, the optimized preparati on parameters of two glass ceramics in the system MgO-Al2O3-SiO2 (MAS) and BaO-MgO-Al2O3SiO2 (BMAS) were investigated. The optimized prepara tion is related mainly to the mechanical properties of composites havi ng a high portion of crystalline matrix microstructure. As a first ste p, the temperature ranges were determined at which the glass matrix cr ystallizes to a high degree. The optimized mechanical properties of th e composites were obtained by systematic variation of the temperature- pressure profile for the densification of the prepregs. The best resul ts were obtained by densifying the composition of each composite in th e glass temperature region, T-g, before the matrix started to crystall ize. Optima mechanical properties exist also for composite fibre conce ntrations observed in the range of 31-33 vol%.