The mechanical and thermal insulating properties of resin-derived carbon foams reinforced by K₂Ti₆O₁₃ whiskers

Reinforced carbon foam materials were produced with phenolic resole resin as precursor and K₂Ti₆O₁₃ whiskers as additives. Effects of the content of whiskers on microstructure, compressive strength and thermal properties of carbon foams were investigated. The results showed that the carbon foams had a spherical and closed cell structure, and the distribution of cells was relatively uniform. The specimens with less than 4wt% K₂Ti₆O₁₃ whiskers exhibited a higher compressive strength than neat foams. When the content exceeded 4wt%, the irregular openings on the cell walls revealed in microstructure images led to decrease in compressive strength. The thermal conductivity went down with increasing the content of whiskers as expected, which ranged from 0.24 to 0.40Wm^-1K^-1 at room temperature.