Structure Control And Composite Reinforcement Of Coal-tar Pitch-based Carbon Foam

In order to solve the problem of nonuniform pore structure,low compressive strength and high preparing cost,a series of coal-tar mesophase pitch-based carbon foam serials with high compressive strength were prepared by self-bubbling method,the effect mechanism of PAN-based carbon fibers’one dimensional structure and mesocarbon microbeads’spherical structure on the compressive strength were studied;coal-tar pitch with high softening point was used to prepare a series of carbon foam at nearly atmospheric pressure in order to develop the application of carbon foam as thermal insulation material in the energy-saving building.The main experimental results or conclusions are summarized as follows:1) The enhance mechanism of carbon fibers and mesocarbon microbeads were pullout effect and nail effect,the enhance effect of mesocarbon microbeads was better,when carbon foam was prepared at600℃/7.5MPa using coal-tar mesophase pitch mixed with40wt%MCMB as material,the compressive strength was24.29MPa;2) Coal-tar pitch with high softening point was modified by toluene extraction,then carbon foam with uniform pore structure was prepared at nearly atmospheric pressure, the pore size was200-300μm,the composition distribution of coal-tar pitch with high softening point was as follows:TS:14.2%,TI-QS:20.9%,QI:64.9%;3) Large size carbon foam with uniform pore structure was prepared at nearly atmospheric pressure using modified coal-tar pitch with high softening point as material,the pore size was100～350μm,the carbon foam size was Φ200x200mm.This work promoted the industrialization process of carbon foam.