Method for evaluating brittleness of R-T-B rare earth permanent magnet

The invention provides an R-T-B rare earth permanent magnet brittleness evaluation method, which comprises the following steps: processing an R-T-B rare earth permanent magnet into magnetic sheets with the same shape and size, labeling the magnetic sheets, recording the initial weight of each magnetic sheet, flatly laying a certain number of magnetic sheets in the bottom of a container, fixing the magnetic sheets on an electromagnetic vibrator, and carrying out vibration test to obtain the brittleness of the R-T-B rare earth permanent magnet. The weight after vibration is measured, the brittleness of the R-T-B magnet is represented by calculating the ratio k of the weight loss amount of the magnetic sheet before and after vibration to the initial weight, and the larger the k value is, the larger the brittleness of the magnet is, and the more likely edge missing and corner falling are generated. According to the method, sample preparation is convenient, operation is easy, the defects that a traditional magnet