Rare earth nitride dispersion strengthened titanium-doped copper alloy and preparation method thereof

Abstract

The invention discloses a rare earth nitride dispersion strengthening titanium-doped copper alloy and a preparation method thereof. The copper alloy is composed of copper, rare earth nitride and titanium. The copper alloy comprises, by mass, 70%-80% of copper, 0.1%-8% of rare earth nitride and the balance titanium. The method comprises the following steps: blowing rare earth nitride particles into a copper melt, stirring until the rare earth nitride particles are uniformly mixed, spraying titanium powder into a copper alloy melt, cooling the copper alloy melt, carrying out pressure casting to obtain a green body sample, and carrying out degassing and thermal aging treatment on the green body. The copper alloy prepared by the invention has the characteristics of high hardness, high wear resistance and high electric conductivity and heat conductivity.

Description

technical field [0001] The invention belongs to the technical field of copper-titanium alloys, in particular to a rare earth nitride dispersion-strengthened titanium-doped copper alloy with high hardness, high wear resistance, high electrical and thermal conductivity, and certain ductility and a preparation method thereof. Background technique [0002] Copper-titanium alloy has high strength, high hardness, heat resistance, wear resistance, high electrical conductivity, excellent fatigue resistance and good ductility. It is widely used in the electronics industry and is used in a large amount. Commonly used in the manufacture of various cables and wires, motors and transformers, switches, and printed circuit stencils. [0003] At present, copper-titanium alloys are mainly prepared by vacuum melting and powder metallurgy. [0004] When vacuum smelting is used, due to the large difference in the density of titanium and copper, the added titanium powder particles cannot be eve...

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Problems solved by technology

[0004] When vacuum smelting is used, due to the large difference in density between titanium and copper, the added titanium powder particles cannot be evenly distributed in the copper melt during the smelting process, and it is easy to form composition segregation, which affects the fatigue resistance of alloy products;

[0005] When adopting vacuum consumable electric arc furnace melting technology, a large-tonnage hydraulic press must be used to prepare consumable electrodes before smelting. The process is cumbersome and the utilization rate of residual titanium is low.

When producing large-scale copper-titanium alloy ingots, low-density and high-density inclusions cannot be effectively removed, and the above-mentioned process can only be used to produce round ingots; in order to eliminate element segregation, most of the final products must be remelted, which seriously reduces the Product production efficiency;

[0006] When the method of powder metallurgy is used to prepare, due to the reduction of the particle diameter of the reinforcing phase powder, the ball milling method is usually used for mechanical mixing, but the above method cannot make the powder particles uniform, resulting in a decrease in the mechanical properties of the alloy material; and in mechanical mixing During the process, oxygen and iron pollutants will be introduced into the alloy powder, and the pollutants have a great impact on the strength of the alloy sample and its electrical and thermal conductivity; the method of preparing copper-titanium alloy by powder metallurgy, due to its technological limitations, Not suitable for the production of large-scale copper alloy products

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