This invention discloses a method for preparing composite materials using a combination of
slurry circulation
filtration and impregnation
pyrolysis, belonging to the field of ultra-high temperature
ceramic matrix
composite material preparation technology. Ultra-high temperature ceramics (UHTC) are introduced into the interior of a carbon
fiber preform through
slurry circulation
filtration, followed by the preparation of C / SiC-UHTC composite materials using a precursor impregnation
pyrolysis process. Specific steps include: preparing a stable UHTC
slurry; establishing a circulation
filtration system; slurry circulation filtration / impregnation; preparing a PCS precursor solution; and precursor impregnation
pyrolysis. This invention establishes a slurry circulation filtration
system and optimizes the slurry impregnation process. Compared with traditional slurry impregnation methods, this method enhances slurry stability, maximizes the uniform distribution and
penetration depth of the
ceramic phase within the preform, and improves reaction efficiency and cost-effectiveness. Combined with precursor impregnation pyrolysis, the
composite material is further densified, reducing the material preparation cycle and obtaining a dense, uniformly distributed, high-strength,
ablation-resistant, and oxidation-resistant C / SiC-UHTC
composite material.