Application of silicon brass pre-alloyed powder in diamond tools

The silicon brass pre-alloyed powder with 0.4% Ce by mass was prepared by gas-water coupling atomization method. The dense sintered body were obtained by hot pressing sintering at 680~720 ℃. The hardness of the sintered body is HRB 62~65 tested by Rockwell hardness tester, and the bending strength is 530~550 MPa tested by the universal testing machine. The microstructure of the sintered body is consisted of the brass phase (α phase) and the vermicular and flower-like dispersed silver gray (β′ + γ) phases observed by scanning electron microscope. The diamond cutting segment for granites were prepared by the mixed powders of iron powder + copper powder + zinc powder + 20% silicon brass pre-alloyed powder by mass. Compared with the cutting segment prepared by the elemental powders (iron powder + copper powder + zinc powder), the hardness of the cutting segment prepared by the mixed powders with silicon brass pre-alloyed powder increases by 22% and the bending strength decreases by 8%. The sharpness and service life of the cutting segment with silicon brass pre-alloyed powder were improved, and the matrix was characterized by the reduction of abrasive inclusions and a large number of chip removal grooves.