Infiltration of molten ceramic into a fiber preform is limited by low viscosity of molten ceramics and by high temperature causing chemical interaction between the molten matrix and the dispersed phase (fibers). This process (similar to Liquid state fabrication of Metal Matrix Composites) is sometimes used for fabrication glass matrix composites.
Slurry Infiltration Process (SIP) involves the following operations:
Reactive Melt Infiltration Process (RMI) is used primarily for fabrication of silicon carbide (SiC) matrix composites (Fabrication of Ceramic Matrix Composites by Liquid Silicon Infiltration (LSI)). The process involves infiltration of carbon (C) containing preform with molten silicon (Si). Infiltration is usually capillary forced. Carbon of the impregnated preform reacts with liquid silicon, forming silicon carbide (SiC). Resulting matrix consists of silicon carbide and some residual silicon.
When liquid aluminum (Al) is used for infiltration of a preform in oxidizing atmosphere, alumina-aluminum (Al2O3 – Al) matrix is formed (Fabrication of Ceramic Matrix Composites by Direct Oxidation Process).
Polymer Infiltration and Pyrolysis (PIP) involves the following operations:
Matrices consisting of carbon, silicon carbide, silicon oxycarbide, silicon nitride and silicon oxynitride may be fabricated by PIP method.
The following materials are used as polymers in Polymer Infiltration and Pyrolysis method:
Polymer Infiltration and Pyrolysis method are simple low temperature methods, which allow production of intrinsic parts.