Preparation method of non-vacuum downward-casting copper-zirconium alloy slab ingot

Abstract

The invention discloses a preparation method of a non-vacuum downward-casting copper-zirconium alloy slab ingot. The preparation method comprises the following steps: S1, carrying out burdening: weighing required raw materials according to percentage; S2, carrying out smelting: installing an electrolytic copper plate into a furnace, adding a covering agent, a copper-magnesium alloy, titanium and rare earth Re in sequence for smelting after the copper plate is molten, preparing molten copper for discharging after smelting is finished, and keeping the temperature of the molten copper at 1,200-1,300 DEG C; S3, adding the alloy: sealing a tundish with a cover plate, starting a heating device, discharging the molten copper, pouring the molten copper into the tundish, calculating a copper-zirconium alloy according to 5-10% of burning loss, and adding the copper-zirconium alloy into the tundish at intervals; and S4, performing continuous casting: performing downward-casting through a slab ingot crystallizer pipe. By adopting the preparation method, the problem that zirconium cannot be continuously added during the preparation of the copper-zirconium alloy is solved, and the problem that the uniformity of zirconium in a substrate is difficult to ensure is solved in a preparation process, so that a final material has uniform performance, the preparation requirement is met, and the material has high reproducibility.

Description

Technical field [0001] The invention relates to the technical field of alloy manufacturing, in particular to a method for preparing a copper-zirconium alloy slab without vacuum. Background technique [0002] Copper-zirconium alloy is a high-conductivity, medium-strength copper alloy. It has the same electrical conductivity as oxygen-free copper and an excellent balance of strength and heat resistance. Its main characteristics are electrical conductivity and thermal conductivity. The rate reaches 95% IACS. It has 20% higher strength than pure copper, excellent heat resistance, non-magnetic, and is widely used in IC lead frames, transistor lead frames, various semiconductor packaging heat dissipation materials, automotive terminals, connectors, Junction boxes, conductive parts requiring large currents, etc. [0003] Since the solubility of zirconium in copper at 972°C is 0.12wt%, it is easy to oxidize at high temperatures, with low yield and uneven distribution in the copper matrix....

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Problems solved by technology

[0003] Since the solubility of zirconium in copper at 972°C is 0.12wt%, it is easy to oxidize at high temperature, and the yield is low and the distribution in the copper matrix is ​​uneven. Vacuum melting and casting of copper-zirconium alloys is widely used at home and abroad, but large-tonnage ingots cannot be produced, which restricts the mass production and use of this alloy.

[0004] The existing copper-zirconium alloy production methods are batching, furnace loading, vacuum melting, vacuum casting, and cooling out of the furnace; vacuum induction melting and pouring are used to produce hundreds of kilograms of ingots, and the production time of a single furnace is long, the production efficiency is low, and the production cost is high. It cannot meet the requirements of large ingots, and the vacuum furnace cannot be continuously added zirconium, which makes it difficult to ensure the uniformity of zirconium in the matrix, and the final material properties are not uniform and cannot meet the requirements; therefore, a new type of copper-zirconium alloy is required. Preparation method to optimize the solution to the above-mentioned problems

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