Diamond abrasive tool and preparation method thereof

The invention belongs to the technical field of diamond abrasive tool manufacturing, and particularly relates to a diamond abrasive tool and a preparation method thereof. The preparation method of thediamond abrasive tool comprises the following steps of providing Ir-Ni- Ta-(B) high temperature amorphous alloy powder, MBD diamond powder and metal bond powder; uniformly mixing the Ir-Ni-Ta-(B) high temperature amorphous alloy powder, the MBD diamond powder and the metal bond powder together to obtain diamond abrasive powder; and filling a forming die with the diamond abrasive powder, and thenforming through ultrasonic vibration under a certain pressure to obtain the diamond abrasive tool. Under the action of ultrasonic vibration and pressure, a large amount of frictional heat is generatedat a powder interface instantaneously, and the instantaneous temperature of the interface is increased instantaneously, which promotes the atom flow and diffusion at the powder interface. Plastic rheology is easy to occur at t