Properties and transpiration cooling performance of Cf/SiC porous ceramic composite

Transpiration cooling have gradually become the lead candidate for thermal protection technology of hypersonic vehicle also due to its excellent cooling performance. The porous medium with exceptional properties can further improve thermal protection capability and reliability of transpiration cooling. This paper investigates the preparation and properties of Cf/SiC f /SiC porous ceramic composite with low density and remarkable permeability, and probes the transpiration cooling performances of ceramic composites (mass ratio of silicon carbide particles and short chopped carbon fibers of 1:1) in the various heat flux conditions. The research results show that Cf/SiC f /SiC porous ceramic composites prepared by adding short chopped carbon fibers have uniform pore size distributions (3_20 mu m) and low densities (1.074 g/cm3 3 _ 1.377 g/cm3), 3 ), as well as outstanding wettability and permeability (6.07 x 10-- 8 mm2 2 _ 12.22 x 10-- 8 mm2). 2 ). Besides, The Cf/SiC f /SiC porous ceramic composites (mass ratio of 1:1) display excellent transpiration cooling performance, meanwhile a new interesting phenomenon that the water pressure difference increases with the rising of heat flow is discovered. Such studies can provide an essential reference for developing porous medium in transpiration cooling technology.