In this study, thermal radiation was employed for sintering silicon carbide foams that achieved a gradient porous structure. The simultaneous use of graphite and carbon fiber reinforced carbon composite (C-f/C) radiators resulted in an axial temperature gradient of similar to 600 degrees C along the cylindrical sample, as confirmed by both numerical simulation and experimental measurement. By sintering the cylinder top at 1600 degrees C for 5 min, the porous SiC body achieved an axial pore size gradient from similar to 106 +/- 36 mu m to similar to 250 +/- 84 mu m and an open porosity from 41.4 to 79.8 vol%. This work indicates the potential of sintering by intense thermal radiation technique for rapid manufacturing functionally graded materials through asymmetric assembly of thermal radiators.