Method of non-vacuum melting and casting copper-chromium-zirconium alloy

Abstract

The invention relates to a method for non-vacuum melting and casting a copper-chromium-zirconium alloy. The method comprises the steps of drying an oven, loading a copper-containing raw material and a covering agent in a hearth of a melting furnace, melting the copper-containing raw material into copper water; (2) pulverizing chromium metal powder into particles with the particle size of 3-5 mm, putting the particles in a fire-resistant container, sealing the container, pressing the fire-resistant container into the copper water to make the chromium metal particles completely released into the copper water, and keeping a temperature of the hearth at 1,300-1,400 DEG C; (3) wrapping a zirconium metal by a copper foil, pressing the zirconium metal wrapped by the copper foil in the copper water rapidly, keeping the temperature of the hearth at 1,250-1,350 DEG C for 5-10 minutes, shutting down the furnace and slagging off; and (4) adjusting the temperature of the hearth to 1,200-1,300 DEG C, transferring a melt in the melting furnace into a casting ladle, and casting the melt. The method provided by the invention is simple in operation and low in cost, has small oxidation loss of the chromium metal and the zirconium metal, and can be produced in large-scale.

Description

Technical field [0001] The invention belongs to the technical field of non-ferrous metal processing and manufacturing, and specifically relates to a method for non-vacuum melting and casting of a copper-chromium-zirconium alloy. Background technique [0002] The chemical composition of the copper-chromium-zirconium alloy is 0.5% to 1.2% chromium, 0.05% to 0.25% zirconium, and the balance is copper. Copper-chromium-zirconium alloy has high strength and good electrical and thermal conductivity. Since it was invented in the United States, it has been widely used in high-strength and high-conductivity fields. It is currently the only high-strength, high-conductivity lead frame material that can meet the performance requirements of VLSI circuits. The tensile strength of copper-chromium-zirconium alloy: Rm≥600Mpa, electrical conductivity: λ≥80%I ACS, it also has a recrystallization temperature as high as 500℃. [0003] The primary problem in the industrial production of copper-chromium...

AI Technical Summary

Problems solved by technology

But this method also has many disadvantages: 1. small production capacity, difficult to form large-scale production; 2. high production cost; 3. low production efficiency, difficult to produce large-scale materials; certain impact; ⑤ poor market competitiveness

Although this method can reduce oxidation burning loss, it needs a protective gas device, and self-made or purchased protective gas will increase the production cost; the addition of metal chromium in the form of a master alloy requires the preparation of a copper-chromium master alloy first, which will also increase production. cost; in addition; the gate is opened at the bottom of the induction furnace, one is that safety issues cannot be guaranteed, and the other is that it is possible to conduct a small amount of experiments as an experimental device, but it cannot meet the requirements for large-scale industrial production