The invention provides a method for reusing a sintered reclaimed NdFeB material. According to the method for reusing the sintered reclaimed NdFeB material, the sintered reclaimed NdFeB material becomes a
powder material with a certain
granularity after breaking,
hydrogen decrepitation, sieving, mixing and crushing through an air
stream mill are conducted, a Pr-Nd or Nd
rare earth nanometer additive is added to the sieved
powder material through a jet-propelled method in an
argon atmosphere, and then the sieved
powder material and the additive are evenly mixed;
magnetic field orientation forming, isostatic pressing and
sintering are conducted on the sampled powder material, so that a sintered sample is formed, then performance detection is conducted on the sintered sample, according to a sample detection result and the
performance requirement, 0-60 wt% of powder of a relevant grade is added, even mixing is conducted, and after
magnetic field orientation forming, isostatic pressing and
sintering are conducted on the mixture, a NdFeB finished product is formed. According to the method for reusing the sintered reclaimed NdFeB material,
roasting and remelting are not needed, it is only required that
rare earth nanometer powder is directly added to reclaimed powder and evenly mixed with the reclaimed powder, and then the product can be prepared according to a conventional technology; in this way, the technology process is simple, task time is shortened,
energy consumption is reduced, the amount of used
rare earth is reduced by 50% relatively, and the
coercivity is increased by 15%-20% relatively; due to the effect of the rare earth nanometer additive,
liquid phase mobility is improved during
sintering,
magnet consistency is improved, the sintering temperature is lowered, and sintering time is shortened.