A method for preparing a non-inclusion high-purity copper rod

By adding a ceramic filter cover and introducing refining gas at the bottom of the crystallizer, combined with liquid level monitoring, the problem of impurities inside the copper rod was solved, and high-purity copper rods were prepared to meet the needs of high-end applications.

CN122425171APending Publication Date: 2026-07-21SHANGHAI JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI JIAOTONG UNIV
Filing Date
2026-03-27
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The copper rods produced by the existing upward continuous casting process have quality problems such as surface oxidation, internal slag inclusions and hollowness, which make it difficult to meet the stringent requirements of the high-end semiconductor and target material industries. In particular, they are prone to arc initiation, bubbles or thin film defects during high-temperature vacuum welding or high-energy sputtering.

Method used

By adding a tubular ceramic filter cover at the bottom of the crystallizer, combined with the refining gas inlet and liquid level monitoring device at the bottom of the smelting furnace, impurities are filtered through the siphon effect. Combined with ceramic or alloy sizing sleeves to replace graphite sleeves, the oxygen content is controlled to be less than 10 ppm and the hydrogen content to be less than 2 ppm, ensuring the purity of the copper rod.

Benefits of technology

It significantly improves the cleanliness and yield of copper rods, prevents inclusions caused by graphite friction, ensures that copper rods do not generate bubbles in high-temperature environments, and provides high-quality, high-performance substrates.

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Abstract

The application relates to the technical field of copper alloy, in particular to a preparation method of a non-inclusion high-purity copper rod, which has the technical scheme as follows: electrolytic copper is melted in a smelting furnace, then charcoal is covered, and then refining gas is introduced to cover the surface of the electrolytic copper with graphite scales and monitor the liquid level; the liquid ceramic cover is used for siphon filtration; a ceramic tube or alloy copper tube is used as a sizing sleeve to reduce slag inclusion; and an up-drawing continuous casting process is used to draw the high-purity copper rod; the application adds a tubular ceramic filter cover, uses the siphon principle to uniformly distribute the pressure of the copper melt entering the crystallizer, reduces the instantaneous suction of the copper melt, prevents the graphite scales and oxidized dross from entering the crystallizer, can prevent bubbles from entering the forming area, replaces the graphite sleeve in the traditional crystallizer with a ceramic tube or alloy copper tube, completely eliminates secondary slag inclusion pollution caused by graphite friction, greatly improves the yield of high-quality oxygen-free copper rods, and provides high-quality base materials for the manufacturing of high-performance target materials and heat sinks.
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