Properties of carbon nano-tubes–Cf/SiC composite by precursor infiltration and pyrolysis process

Carbon nanotubes (CNTs) were introduced into the precursor infiltration and pyrolysis (PIP) carbon fiber reinforced silicon carbide matrix (Cf/SiC) composite via the infiltration slurry. The weight fraction of CNTs in the composite was 0.765‰. The fiber–matrix interface coating was prepared through chemical vapor deposition (CVD) process using methyltrichlorosilane (MTS). Effects of the CNTs on mechanical and thermal properties of the composite were evaluated by three-point bending test, single-edge notched beam (SENB) test, and laser flash method. Attributed to the introduction of the small quantity of CNTs, flexural strength and fracture toughness of the Cf/SiC composite both increased by 25%, and thermal conductivity at room temperature increased by 30%.

Research highlights
► Carbon nanotubes (CNTs) introduced into carbon fiber reinforced silicon carbide matrix (Cf/SiC) composite via the infiltration slurry.
► We quantitatively investigate the effects of small quantity CNTs on flexural strength, fracture toughness and RT thermal conductivity of 3D Cf/SiC composite.
► We combine the advantages of commercial grade CNTs and 3D Cf/SiC composite structure with a simple process; provide industry production basis for this composite.