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Short-process preparing method for high-strength and high-conduction Cu-Cr-Ag alloy

A cu-cr-ag, short-process technology, applied in the field of non-ferrous metal processing, can solve the problems of complex solution treatment operation, control of alloy microstructure and performance stability, and influence on alloy properties, so as to eliminate the need for solution quenching treatment process, Improved softening resistance and controllable degree of recrystallization

Active Publication Date: 2018-07-13
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the production process, the solution treatment operation is complicated, which not only consumes a lot of energy and increases the production cost, but also, the solution treatment under high temperature conditions can easily cause severe oxidation of the alloy surface, resulting in material loss and affecting the properties of the alloy. In addition, the quenching process The alloy is required to be cooled rapidly in a short period of time, otherwise it will be difficult to obtain effective supersaturated solid solubility. However, copper alloy products produced on a large scale, such as long-length wires, heavy coils and strips, are limited by their own shape and size. It is difficult to obtain the same cooling rate in each part of the alloy, especially there is a significant difference in cooling rate between the head and the tail, the surface and the core, which causes the difficulty of controlling the stability of the alloy structure and properties, and severely limits the aging strengthening of Cu-Cr. -Scale production and application of Ag alloy

Method used

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  • Short-process preparing method for high-strength and high-conduction Cu-Cr-Ag alloy
  • Short-process preparing method for high-strength and high-conduction Cu-Cr-Ag alloy
  • Short-process preparing method for high-strength and high-conduction Cu-Cr-Ag alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1. According to the alloy composition: 0.3 wt.% Cr, 0.08 wt.% Ag, 0.02 wt.% Mg, and the balance is Cu. Among them, pure silver is selected for silver, pure magnesium is selected for magnesium, Cu-Cr intermediate alloy is selected for chromium, and pure copper is used to fill up the remaining copper. Put the raw materials into the intermediate frequency induction furnace for melting, and use an appropriate amount of dehydrated carbon powder as the covering agent. Specific smelting process: Put pure copper into an intermediate frequency induction furnace for smelting, use dehydrated carbon powder as a covering agent, and the melting temperature is 1200-1250°C, first add pure silver and pure Mg for smelting, its main function is to prevent the Cr element Excessive burning to avoid the difference in Cr element content in different parts of the long-length alloy product, keep it at 1250°C for 10min, then add Cu-Cr master alloy, and keep it at 1200°C for 8min. On-line t...

Embodiment 2

[0039] Step 1. According to the alloy composition: 0.7 wt.% Cr, 0.08 wt.% Ag, 0.02 wt.% Mg, and the balance is Cu. Among them, pure silver is selected for silver, Cu-Cr intermediate alloy is selected for chromium, and the remaining copper is filled with pure copper. The raw materials are put into a medium frequency induction furnace for melting, and an appropriate amount of dehydrated charcoal powder is used as a covering agent, and the melting temperature is 1200-1250°C. Specific smelting process: put pure copper into an intermediate frequency induction furnace for smelting, use dehydrated carbon powder as a covering agent, and the melting temperature is 1200~1250°C, first add pure silver and pure Mg for smelting, keep at 1250°C for 10 minutes, then Add Cu-Cr master alloy and keep it at 1200°C for 8min. On-line testing of ingredients, supplementing raw materials until they meet ingredient requirements.

[0040] Step 2: Prepare a Φ14 mm Cu-Cr-Ag alloy billet conforming to th...

Embodiment 3

[0047] Step 1. According to the alloy composition: 0.7 wt.% Cr, 0.08 wt.% Ag, 0.02 wt.% Mg, and the balance is Cu. Among them, pure silver is selected for silver, Cu-Cr intermediate alloy is selected for chromium, and the remaining copper is filled with pure copper. The raw materials are put into a medium frequency induction furnace for melting, and an appropriate amount of dehydrated charcoal powder is used as a covering agent, and the melting temperature is 1200-1250°C. Specific smelting process: put pure copper into an intermediate frequency induction furnace for smelting, use dehydrated carbon powder as a covering agent, and smelt at a temperature of 1200-1250°C. Add Cu-Cr master alloy and keep it at 1200°C for 8min. On-line testing of ingredients, supplementing raw materials until they meet ingredient requirements.

[0048] Step 2: Prepare a Φ14 mm Cu-Cr-Ag alloy billet conforming to the design composition by upward continuous casting, and the upward temperature is 1200...

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Abstract

The invention provides a non-solid-solution treatment short-process preparing method for a high-performance Cu-Cr-Ag alloy. A Cu-Cr-Ag alloy rod billet is prepared and obtained through up-drawing continuous casting, and the up-drawing temperature is 1200-1250 DEG C; multi-pass drawing is conducted; aging is conducted; and final drawing is conducted. The supersaturated solute atomic concentration is obtained through the fast-cooling process of up-drawing continuous casting, solid solution treatment is not conducted, solute atoms are promoted to precipitate directly through matching of subsequent drawing and the aging technology, the recrystallization degree is controlled synchronously to retain a certain machining hardening effect, and through strengthening mechanisms of solid-solution strengthening, aging precipitation phase strengthening and cold work hardening, and the purpose of preparing the high-strength and high-conduction softening-resisting Cu-Cr-Ag alloy can be achieved without solid solution treatment. The tensile strength of materials can reach 500-755 MPa, the conductivity is 70-85% IACS, the elongation is 1-14%, and the softening temperature can reach 550-600 DEG C. The short-process preparing method has the characteristics of the short process, high efficiency and low energy consumption, and the prepared Cu-Cr-Ag alloy can meet the practical application demand ofthe fields such as semiconductors and rail traffic.

Description

technical field [0001] The invention belongs to the field of nonferrous metal processing, and in particular relates to a short-flow method for preparing high-performance Cu-Cr-Ag alloy wires. Background technique [0002] Due to their excellent electrical and thermal conductivity, copper and its alloys are widely used in rail transit, aerospace, energy and power, electronic appliances and other fields, such as contact wires for high-speed rail and lead frame materials for semiconductors. The mechanical properties of pure copper are low, and it is difficult to meet the requirements for the mechanical properties of materials in the above fields. The study found that the strength of the alloy can be significantly improved by adding alloying elements, heat treatment and plastic deformation. However, in most cases, as the strength increases, the electrical conductivity of the material decreases, and the strength-conductivity relationship is inverted. Therefore, it is difficult ...

Claims

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Application Information

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IPC IPC(8): C22C9/00C22C1/03C22F1/08
CPCC22C1/03C22C9/00C22F1/08
Inventor 袁大伟陈辉明谢伟滨张建波汪航杨斌
Owner JIANGXI UNIV OF SCI & TECH
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