The friction and wear properties of interpenetrating phase composites (IPC) SiC3D/Al sliding against graphite/SiC (G/SiC) composites were investigated using a sub-scale brake dynamometer. The testing conditions included a braking pressure of 1.25 MPa and an initial braking speed (IBS) of 200−350 km/h in a braking process of high-speed train according to the scale-conversion rules. The tribo-couple materials were characterized using scanning electron microscopy (SEM), X-ray diffractometry (XRD), and energy-dispersive X-ray spectrometry (EDS). (nhnhanh)