Fabrication of porous SiC mat for radiation heater by controlling rheology of polycarbosilane

摘要

Combustion properties such as flame stability and flame structure include CO and NO_x emissions in a gas-radiation heater are affected by controlling the optical thickness, scattering properties, fuel gas permeability and thermal conductivity of the porous radiant plate because combustion happens inside and surface of a radiant plate in the form of free flame and combustion energy is transferred to the plate making an infra-red radiation. Fibrous radiant plate have been developed to make efficient radiant systems for uniform heating of object surface with complete and clean combustion and the promising one is porous SiC fiber mat which having a high specific surface area and a high radiation efficiency due to its black colored body In this study, we have investigated an efficient way of forming porous SiC fiber mat from a simple in-situ process using a melt blown process and subsequent bonding of the melt blown fibers together by the curing and pyrolysis under the minimum amount of applied pressure. The thermal and mechanical properties of SiC mat were investigated related to the rheology and the radiation effect was also investigated for the application in a gas fired radiation burner.