The invention discloses
polishing solution for a hard disk magnetic head and a preparation method thereof. The
polishing solution is mainly prepared from
diamond abrasive particles, a dispersing agent, a
corrosion inhibitor, a phase transfer
solvent, an
oil phase medium
regulator and a
hydrocarbon solvent, wherein the average particle size of the
diamond abrasive particles is 30 to 150nm, the
particle size distribution of the particles is 20 to 300nm, and the length-
diameter ratio of the particles is 1.0 to 2.0. The preparation method comprises the following steps of: mixing
diamond powder and a surface modifier,
grinding, removing impurities, and grading to obtain suspension
slurry; adding the phase transfer
solvent into the suspension
slurry, and stirring and dispersing the
system; removing fine particles and coarse particles in the phase transfer
solvent system by grading to ensure that the
particle size distribution and concentration of the diamond
abrasive particles meet the requirements; and transferring to the
hydrocarbon solvent, adding the
oil phase medium
regulator, the dispersing agent and the
corrosion inhibitor, and uniformly stirring to obtain the
polishing solution for the hard disk magnetic head. The polishing solution prepared by the method has high suspension stability and dispersion uniformity, and high polishing efficiency during polishing, and a
machined surface has high quality.