Study On The New Type Of RE-Cr-Co-Cu Alloy Materials

Copper and copper alloy have good electric conductivity, thermal conductivity, corrosion resistance and other properties. With the rapid development of social economy, science and technology, higher requirements for the properties of copper and copper alloys are proposed. Copper alloys with high strength and high conductivity become the research focus because of the excellent physical and mechanical properties. The development tendency of copper alloy is the high hardness, high strength, high electric conduction, high thermal conductivity, high temperature resistance, good resistance to wear and corrosion. To develop copper alloys with excellent combination properties is one of issues urgently in need.Microalloying and composite metalizing can improve the strength and other properties of copper alloys on condition of keeping high conductivity. It is an effective technology for developing copper alloys. And in many kinds of strengthening methods, the copper alloy could have good strength and conductivity by the combination of solution strengthening and aging strengthening. This paper studied the microstructure, abrasion resistance and oxidation resistance of a new kind of RE-Cr-Co-Cu alloy. The combination technology of solution strengthening and aging strengthening and the corrosion resistance to acid rain of the aging alloy were discussed. It is expected to be a guide for engineering application.The microstructure and related properties of RE-Cr-Co-Cu alloy were detected by metalloscope, hardness testing and friction testing. The results showed that:the RE-Cr-Co-Cu alloy consists of CuCr solid solution and Co+Cr+X compounds. The skeleton is formed by CuCr solid solution arranged regularly. The micro hardness and abrasion resistance improved a lot because the Co+Cr+X compounds distributed uniformly in the matrix as reinforcements articles. As the friction coefficient is about0.19, the mass did not change with time. The mechanical properties has made a lot of improvement. High temperature oxidation experiments have been carried out at600±10℃. The results show that dense oxidation film can be formed and combined with the matrix at a lower oxidation rate. Thus the high temperature oxidation resistance is significantly improved. The RE-Cr-Co-Cu alloy was treated first by solution treatment at920±10℃and then aging treatment at500±10℃. The microstructure and properties of treated copper alloy were analyzed by metalloscope, hardness testing and EDS. The results show that grains refined after solution treatment; precipitated phase distributed more uniformly with small size and the microhardness improved a lot. The corrosion resistance and the corrosion behavior of aging RE-Cr-Co-Cu alloy in solution of acid rain which pH is4.5were studied by means of SEM and XRD. The results showed that the corrosion resistance is much better than the original. A dense corrosion layer was formed that insisted of CU2O.