Abstract: This invention is directed to the fabrication of SiC fiber reinforced, ceramic matrix composite articles exhibiting superior high temperature oxidative stability, those articles comprising:(a) a glass-ceramic matrix wherein alkali metal and/or alkaline earth metal aluminosilicate crystals constitute the predominant crystal phase;(b) a fiber reinforcing phase comprising SiC fibers coated with an alkali metal and/or alkaline earth metal sheet silicate entrained within said glass-ceramic matrix; and(c) a borosilicate glass phase dispersed as an intergranular glass within said glass-ceramic matrix, said borosilicate glass phase generally being present in an amount sufficient to provide an intergranular glass phase therein.