Investigation of microstructure and properties of Fe-Co-Cu pre-alloyed powder sintered diamond drill bit matrix with varying particle sizes
Sintered bodies were prepared using the hot pressing sintering process from Fe-Co-Cu pre-alloyed powders of varying particle sizes.The densification,Rockwell hardness,three-point bending strength,micro-structure of the two sintered bodies of different particle sizes,and interface morphology between sin-tered body and diamond were comparatively analyzed.Furthermore,cutting experiments were conducted to as-sess the cutting speed,tool life,and diamond exposure of drill bits prepared using pre-alloyed powders with varying particle sizes to further investigate their performance disparities.The results indicate that the sin-tered body of DB-02,prepared with pre-alloyed powder of finer particle size,exhibits higher density(96.9％)and improved toughness(with a bending strength of 1 355.7 MPa).The modified tool design also results in enhanced retention force on the diamond,leading to improved cutting efficiency,extended tool lifes,and a maximum diamond exposure height of 154.2 μm during cutting experiments.
Fe-Co-Cu pre-alloyed powderdensitybending strengthdiamond drill bitcutting test
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