Effect of slurry on preparation of carbon fiber fabric reinforced silicon carbide ceramic matrix composite by melt infiltration

Abstract

In order to solve the forming difficulty of the ceramic matrix composites used as the aeroengine complex components, carbon fiber fabric was used as the reinforcement, two different slurries, with or without powder additives, were taken to form the carbon fiber fabric reinforced silicon carbide composites via slurry-casting and melt infiltration technology. The process adaptability of the two slurries in the slurry-casting and melt infiltration process were explored, and corresponding basic properties of the composites were investigated. The results show that the viscosity of the two slurries is moderate during the slurry-casting process, and they could keep the station for more than 3-5 hours at the setting temperatures, which could obtain dense and uniform polymer matrix composites. After being carbonized at 900 ℃, the porosity of the solidified sample synthesized via slurries with or without powder is 39.6% and 31.3%, the residual carbon ratio is 24% and 76%, and the average diameter of pore is 0.068 μm and 0.069 μm, respectively. The carbon fiber fabric-reinforced silicon carbide composite prepared with powder-added slurry has lower porosity of 3.54% and higher bending strength of 162 MPa, which meets the application requirements of aeroengine static components.

Keywords

• carbon fiber fabric reinforced silicon carbide composites
• ceramic matrix composites
• slurry-casting mi
• forming process