Ultrahigh purity oxygen-free copper and method for producing the same

By using a repeated purification method under near-equilibrium solidification conditions in a vacuum environment and gradually reducing the lifting speed of the heating hood, impurity elements in the copper melt are separated, solving the problem of preparing high-purity oxygen-free copper in the existing technology and realizing the preparation of ultra-high purity oxygen-free copper with high purity and low oxygen content.

CN119530549BActive Publication Date: 2026-07-03CHINALCO LUOYANG COPPER PROCESSING CO LTD
View PDF 4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-14
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies struggle to efficiently prepare high-purity oxygen-free copper, especially in large-scale integrated circuits and large-size displays. Conventional methods suffer from high production costs and operational difficulties, which affect the properties of copper.

Method used

In a vacuum environment, under near-equilibrium solidification conditions, the purity of copper is gradually improved by repeatedly purifying the molten copper, gradually reducing the lifting speed of the heating hood, separating the impurity elements in the precipitated solid phase and the remaining liquid phase, and finally preparing ultra-high purity oxygen-free copper.

Benefits of technology

The preparation of ultra-high purity oxygen-free copper with high density and low oxygen content has been achieved, with a purity of 5N~6N, oxygen content <2ppm, and hydrogen content <1ppm. This avoids defects such as ingot inclusions and is simple and reliable to operate.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The application relates to ultrahigh-purity oxygen-free copper and a preparation method thereof. In the preparation method, first, cathode copper is added into a graphite crucible of an electric vacuum high-temperature purification furnace to be melted into a copper liquid; second, after the copper liquid is kept warm, a heating cover of the electric vacuum high-temperature purification furnace is slowly lifted upwards, the copper liquid in the graphite crucible is slowly solidified from the bottom, and the solution is completely solidified; then, the solidified ingot is taken out, the two ends of the ingot are cut off, and the remaining ingot after cutting is repeatedly processed according to the first two steps, and the ultrahigh-purity oxygen-free copper ingot is obtained after 3-5 cycles; the prepared ultrahigh-purity oxygen-free copper has a purity of 5N-6N, an oxygen content of <2ppm and a hydrogen content of <1ppm. The application is simple and reliable, can control the copper content of the prepared ingot according to different application directions, and has low gas content, good compactness and low oxygen content.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Method for simultaneously crystallizing and purifying powdery magnesium fluoride

    CN116988153A

  • Method for preparing 5N high-purity copper through electron beam reduction induced directional solidification

    CN117418123A

  • Production of cast ingot of high-purity copper single crystal

    JP1993078195A

  • High-purity single crystal copper and its production and production unit therefor

    JP1998007491A