The microstructure of SiC matrix composite materials produced by pressureless aluminum
melt infiltration at 950° was investigated. The oxygen containing phases fraction in silicon
carbide preform does not considerably change after soaking in molten aluminum due to the
formation of a dense flux film at the surface. It is established that during the direct infiltration
of aluminum from the melt into sintered SiC preform, several areas are observed: aluminum
saturated zone, transition zone, and a porous silicon carbide zone. The depth of the first …

The microstructure of Basalt matrix composite materials produced by pressureless aluminum
melt infiltration at 950° C was investigated. It is established that uniform elements distribution
is observed within the whole sample depth. Interestingly, aluminum content variation
considerably matches the hardness of the sample profile that is connected with alumina
phase presence. Sample color changes during temperature treatment due to phase
transitions were observed. The appearance of the hematite (Fe2O3) phase makes the initial …