Production method for r-t-b-based sintered magnet

A method for producing a sintered R-T-B based magnet, comprising:

• a step of providing a sintered R-T-B based magnet;
• and
• a step of performing a heat treatment at a sintering temperature of the sintered R-T-B based magnet or lower, while an RLM alloy powder (where RL is Nd and/or Pr;
• M is one or more elements selected from among Cu, Fe, Ga, Co, Ni and Al), and an RH compound powder (where RH is Dy and/or Tb;
• and the RH compound is an RH fluoride and/or an RH oxyfluoride) are present on a surface of the sintered R-T-B based magnet, wherein,
• at least the RH compound is allowed to be present in the form of a sheet compact containing an RH compound powder and a resin component;
• the RLM alloy contains RL in an amount of 50 at % or more, and a melting point of the RLM alloy is equal to or less than a temperature of the heat treatment;
• and
• the heat treatment is performed while the RLM alloy powder and the RH compound powder are present on the surface of the sintered R-T-B based magnet at a mass ratio of RLM alloy:
• RH compound=9.6:0.4 to 5:5.