Due to superior properties such as specific strength, hardness, chemical stability, corrosion resistance, and oxidation resistance even at high temperatures, silicon carbide (SiC) ceramics and especially, SiC-based ceramic matrix composites (CMCs) have been expected to be applied for industries in particular for aircraft engines. A lot of manufacturing process have been developed for CMCs such as chemical vapor infiltration (CVI), polymer impregnation and pyrolysis (PIP), melt infiltration (MI), reaction sintering (RS) and liquid phase sintering (LPS). CVI and LPS have advantage in terms of high temperature mechanical properties and neutron irradiation resistance due to highly crystalline SiC and limited impurities. But CVI is high cost. LPS requires pressure which may limit shape flexibility and increase cost. The objective of this work is to develop SiCf/SiC composites by LPS without pressure. Monolithic SiC materials were fabricated for optimization of matrix of pressureless LPS (PLPS) SiCf/SiC composites.
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