Copper alloy with high strength, high electrical conductivity, and high wear resistance and preparation method thereof

Abstract

The present invention provides a copper alloy with high strength, high electrical conductivity, and high wear resistance and a preparation method thereof. The copper alloy includes 0.7 to 1.5 wt % of Cr, 0.2 to 0.6 wt % Zr and Hf, and Cu as balance. The present invention further discloses a preparation method of the copper, and the method includes the following steps: conducting hot-rolling and then solution treatment, removing a surface oxidation layer, and successively conducting first rolling, first aging treatment, second rolling, and second aging treatment. In the present invention, the preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance can effectively avoid mutual interference between hard second phase particles and alloying elements, and the copper alloy with high strength, high electrical conductivity, and high wear resistance prepared by using the method has excellent wear resistance and mechanical properties.

1 . A copper alloy with high strength, high electrical conductivity, and high wear resistance, wherein the alloy comprises 0.7 to 1.5 wt % of Cr, 0.2 to 0.6 wt % Zr and Hf, and Cu as balance. 
     
     
         2 . The copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 1 , wherein the alloy comprises 0.8 to 1.2 wt % of Cr, 0.3 to 0.5 wt % Zr and Hf, and Cu as balance. 
     
     
         3 . The copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 1 , wherein in the alloy, the Cr element exists in the form of nano-precipitates Cr and submicron Cr particles. 
     
     
         4 . The copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 3 , wherein in the alloy, 50 to 70 wt % of the Cr element exists in a form of nano-precipitates Cr with face-centered cubic structure, and 30 to 50 wt % of the Cr element exists in a form of submicron Cr particles with body-centered cubic structure. 
     
     
         5 . A preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 1 , comprising the following steps:
 melting and casting according to the proportion; conducting hot-rolling and then solution treatment, wherein a solution temperature is 960 to 985° C., and a holding time is 0.5 to 1 h; and conducting water-cooling quenching;   removing a surface oxidation layer, and conducting first rolling, wherein a rolling deformation amount is 45 to 75%, and is reduced by 10% each pass, and a rolling temperature is −196 to 30° C.;   conducting first aging treatment, wherein an aging temperature is 400 to 450° C., and an aging time is 120 to 150 min;   conducting second rolling, wherein a rolling deformation amount is 15 to 45%, and is reduced to less than 10% each pass, a rolling temperature is −196 to 30° C., and a total rolling deformation amount of the first rolling and the second rolling is 80 to 95%; and   conducting second aging treatment, wherein an aging temperature is 400 to 500° C., and an aging time is 150 to 360 min.   
     
     
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         10 . A preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 2 , comprising the following steps:
 smelting raw materials according to a proportion; conducting hot-rolling and then solution treatment, wherein a solution temperature is 960 to 985° C., and a holding time is 0.5 to 1 h; and conducting water-cooling quenching;   removing a surface oxidation layer, and conducting first rolling, wherein a rolling deformation amount is 45 to 75%, and is reduced by 10% each pass, and a rolling temperature is −196 to 30° C.;   conducting first aging treatment, wherein an aging temperature is 400 to 450° C., and an aging time is 120 to 150 min;   conducting second rolling, wherein a rolling deformation amount is 15 to 45%, and is reduced to less than 10% each pass, a rolling temperature is −196 to 30° C., and a total rolling deformation amount of the first rolling and the second rolling is 80 to 95%; and   conducting second aging treatment, wherein an aging temperature is 400 to 500° C., and an aging time is 150 to 360 min.   
     
     
         11 . A preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 3 , comprising the following steps:
 smelting raw materials according to a proportion; conducting hot-rolling and then solution treatment, wherein a solution temperature is 960 to 985° C., and a holding time is 0.5 to 1 h; and conducting water-cooling quenching;   removing a surface oxidation layer, and conducting first rolling, wherein a rolling deformation amount is 45 to 75%, and is reduced by 10% each pass, and a rolling temperature is −196 to 30° C.;   conducting first aging treatment, wherein an aging temperature is 400 to 450° C., and an aging time is 120 to 150 min;   conducting second rolling, wherein a rolling deformation amount is 15 to 45%, and is reduced to less than 10% each pass, a rolling temperature is −196 to 30° C., and a total rolling deformation amount of the first rolling and the second rolling is 80 to 95%; and   conducting second aging treatment, wherein an aging temperature is 400 to 500° C., and an aging time is 150 to 360 min.   
     
     
         12 . A preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 4 , comprising the following steps:
 smelting raw materials according to a proportion; conducting hot-rolling and then solution treatment, wherein a solution temperature is 960 to 985° C., and a holding time is 0.5 to 1 h; and conducting water-cooling quenching;   removing a surface oxidation layer, and conducting a first rolling, wherein a rolling deformation amount is 45 to 75%, and is reduced by 10% each pass, and a rolling temperature ranges from −196 to 30° C.;   conducting a first aging treatment, wherein an aging temperature is 400 to 450° C., and an aging time ranges from 120 to 150 min;   conducting a second rolling, wherein a rolling deformation amount is 15 to 45%, and is reduced to less than 10% each pass, a rolling temperature is −196 to 30° C., and a total rolling deformation amount of the first rolling and the second rolling is 80 to 95%; and   conducting a second aging treatment, wherein an aging temperature is 400 to 500° C., and an aging time is 150 to 360 min.   
     
     
         13 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 5 , wherein in the first rolling, the rolling deformation amount is 50 to 65%, and is reduced by 10% each pass, and the rolling temperature is −150 to 25° C. 
     
     
         14 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 10 , wherein in the first rolling, the rolling deformation amount is 50 to 65%, and is reduced by 10% each pass, and the rolling temperature is −150 to 25° C. 
     
     
         15 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 11 , wherein in the first rolling, the rolling deformation amount is 50 to 65%, and is reduced by 10% each pass, and the rolling temperature is −150 to 25° C. 
     
     
         16 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 12 , wherein in the first rolling, the rolling deformation amount is 50 to 65%, and is reduced by 10% each pass, and the rolling temperature is −150 to 25° C. 
     
     
         17 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 5 , wherein in the first aging treatment, the aging temperature is 400 to 425° C., and the aging time is 120 to 130 min. 
     
     
         18 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 10 , wherein in the first aging treatment, the aging temperature is 400 to 425° C., and the aging time is 120 to 130 min. 
     
     
         19 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 11 , wherein in the first aging treatment, the aging temperature is 400 to 425° C., and the aging time is 120 to 130 min. 
     
     
         20 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 12 , wherein in the first aging treatment, the aging temperature is 400 to 425° C., and the aging time is 120 to 130 min. 
     
     
         21 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 5 , wherein in the second rolling, the rolling deformation amount is 25 to 40%, and is reduced to less than 10% each pass, the rolling temperature is −196 to 30° C., and the total rolling deformation amount of the first rolling and the second rolling is 85 to 92%. 
     
     
         22 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 10 , wherein in the second rolling, the rolling deformation amount is 25 to 40%, and is reduced to less than 10% each pass, the rolling temperature is −196 to 30° C., and the total rolling deformation amount of the first rolling and the second rolling is 85 to 92%. 
     
     
         23 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 11 , wherein in the second rolling, the rolling deformation amount is 25 to 40%, and is reduced to less than 10% each pass, the rolling temperature is −196 to 30° C., and the total rolling deformation amount of the first rolling and the second rolling is 85 to 92%. 
     
     
         24 . The preparation method of the copper alloy with high strength, high electrical conductivity, and high wear resistance according to  claim 5 , wherein in the second aging treatment, the aging temperature is 425 to 475° C., and the aging time is 280 to 360 min.