Study On The Friction And Wear Properties And The Thermal Deformace Of Copper Alloy

Recently, study on the wear resistance of copper alloy have become focus on the material field. In this paper, the methods of laser cladding and inlaid materials in soft based material are used to improve the wear resistance of copper alloy. And then the wear resistance microstructure and hardness have been investigated by the equipments of friction machine, scan electron microscope (SEM), optical microscope (OM) and hardness tester. Meanwhile, the hot deformation of particulate reinforced copper based material was investigated which provided useful reference for the processing of particulate reinforced copper based material .The experiment results show that properly choosing of cladding layer materials can make the cladding layer with homogeneous microstructure, fine, compact and well metallurgical bonding with the based material.The wear resistance of laser cladding samples are tested on the MMU-5G friction machine. The results show that the main wear mechanism of laser cladding were fatigue spalling and cutting. On the one hand, the wear rate increased with the increasing of load and speed. On the other hand, the variation of friction coefficient with loads was similar with the wear rate. But its changing with speeds was increasing at first and then decreasing.The wear-resistance varying with loads and speeds of material which inlaid with Zr-base metallic glass were experimentally studied on FALEX pin-disc-type apparatus. The experiment results show that the wear mechanism of these three kinds materials were different from each other. The adhesive wear was the main wear mechanism for copper. The adhesive wear and abrasive wear dominated the wear process of C/Cu composite material. The abrasive wear was found on the surface of inlaid materials.The hot deformation behavior of the particulate reinforced copper based material was investigated by using Gleeble-3500 dynamic testing machine. The results show that the hot deformation activity energy of the composite is 185 kJ/mol, apparent stress exponent is 3.6. This domain of strain rate from 0.3 to 10 s-1 and temperature form 800 to 900℃is unsafe which we must avoid.