Abstract:
The Fe‒C (0.8%C) raw materials were pressed and molded by powder metallurgy technology. The influence of end-face friction and wear condition on the PV limit of Fe‒C (0.8%C) moulding specimens was investigated. The results show that, under the conditions of 6.8 g/cm
3 compact density and 200 N/(10 min) loading amplitude, when the friction speed is 0.2~0.8 m/s, the limit PV increases with the increase of friction speed. When the friction speed is 0.8 m/s, the limit PV reaches the maximum of 5.17 MPa·m·s
‒1. When the friction speed reaches 1.0 m/s, the biting can easily occur. Under the conditions of 6.8 g/cm
3 compact density and 0.4 m/s friction speed, when the loading amplitude is 200~500 N/(10 min), the maximum limit PV is 4.73 MPa·m·s
‒1. Under the same friction speed, the smaller the loading amplitude, the closer the PV test result is to the true PV value. Under the conditions of 0.4 m/s friction speed and 200 N/(10 min) loading amplitude, when the compact density is 5.9~6.5 g/cm
3, the PV value remains unchanged, all being 4.31 MPa·m·s
‒1. When the compact density is 6.8 g/cm
3, the limit PV is 4.59 MPa·m·s
‒1, which increases slightly, mainly related to the roughness of the grinding mark surface.