Effect of TiH₂ on structure and properties of Cu60Zn40 alloy metal bond

The effects of TiH₂ volume concentration and sintering temperature on the mechanical properties and microstructure of Cu60Zn40 binder were studied with Cu60Zn40 alloy powder as raw material and TiH₂ as additive. TiH₂ can activate sintering and the mechanical properties of Cu60Zn40 were improved. When the sintering temperature is 680 ℃ and the volume concentration of TiH₂ increases from 0 to 10%, the flexural strength increases from 225 MPa to 445 MPa while the impact strength increases from 28.3 kJ/m² to 54.3 kJ/m². When the sintering temperature is 560 ℃ and the volume concentration of TiH₂ increases from 0 to 5%, the hardness increases from 46 HRB to 88 HRB. The porosity increases with the increase of TiH₂ volume concentration. When the volume concentration of TiH₂ is 20%, the porosity is 6.2%. The addition of TiH₂ is beneficial to the grinding performance of Cu60Zn40 bonded diamond grinding tool. The wear ratio increases from 28.50 to 61.67 and that the surface burn of workpiece is reduced when volume concentration of TiH₂ increases from 0 to 10%.