Production method of high-strength, high-conductivity and heat-resistant copper alloy

Abstract

The invention discloses a production method of a high-strength, high-conductivity and heat-resistant copper alloy, and belongs to the technical field of copper alloy machining. Accoding to the production method of high-strength, high-conductivity and heat-resistant copper alloy, the inner liner of a crystallizer adopted in the upper-induced continuous casting process is a carbon-carbon composite material so as to ensure the lubrication, high heat conduction and high temperature resistance properties; the temperature of the upper-induced continuous casting is 1180-1230 DEG C, the casting temperature is low so that the problem that molten liquid in the crystallizer is difficult to solidify and the crystallizer inner liner is worn during casting can be effectively avoided; the pressure of protective gas nitrogen in the liquid surface of an upper-induced furnace is controlled to be 0.2-0.7 atmosphere, so that the phenomenon of solid-liquid interface separation in the crystallizer is avoided, and a copper-chromium alloy product with larger weight and length is produced; according to the production method of the high-strength, high-conductivity and heat-resistant copper alloy, the cheapelement (Mg) is used for replacing the rare noble metal, and the mechanical property and the softening resistance property of the copper-chromium alloy are improved; and the production method is a non-vacuum and short-process preparation technology, the cost is low, and the production method is suitable for large-scale industrial production and has important economic and social significances.

Description

technical field [0001] The invention belongs to the technical field of copper alloy processing, and in particular relates to a production method of a high-strength, high-conductivity and heat-resistant copper alloy. Background technique [0002] With the rapid development of the electronics industry and high-speed railways, the demand for high-strength and high-conductivity copper alloys is increasing day by day, especially as the speed of high-speed railways increases to more than 350km / h, the copper alloys used in high-speed railway catenary lines are required to be as complete as possible within a span The line (1000mm), there is no solder joint in the middle, to ensure the safety of use, the cross-section is 150mm 2 Take the catenary wire as an example, plus the requirements of defense wire and hanging wire, the length of a single wire should be 1200m, and the weight of a single coil of the wire blank that needs to be prepared can reach 2.5 tons to meet the requirements,...

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Problems solved by technology

At present, the preparation process of copper-chromium alloy generally requires vacuum melting and casting to reduce oxidation and volatilization, and ensure that the product has a chemical composition that meets the requirements. The existing production methods of copper-chromium alloy mainly include: (1) Vacuum melting→extrusion process , due to the inherent structure of the vacuum induction furnace, its production method is limited to periodic products, and because the crucible capacity is fixed, the weight and length of a single piece of casting are limited to a certain extent, and its production cost is relatively high; (2) non- Vacuum melting→continuous casting→extrusion process, its disadvantage is that the composition of the alloy is difficult to control, because the continuous casting process adopts horizontal continuous casting or vertical semi-continuous casting, and the traditional mold lining is made of graphite material, chemical reactions often occur: C+Cr→Cr 23 C 6 , so that the inner surface of the crystallizer becomes rough, resulting in the interruption of the up-leading process, and it is impossible to produce copper-chromium alloy products with large weight and length

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