Preparation method for oxygen-free copper tube for magnetron

A technology of oxygen-free copper tube and oxygen-free copper, which is applied to the cathode of magnetron and transit-time electron tube, etc., which can solve the problem that the oxygen content cannot be controlled and the oxygen content of copper tube cannot be satisfied. Advanced problems, to achieve the effect of excellent surface roughness, improved yield, and good electrical conductivity

Active Publication Date: 2012-07-25
江阴和宏特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting furnace process of vertical semi-continuous casting adopts the method of "casting from the bottom". During casting, the copper liquid has the opportunity to contact with oxygen, so the oxygen content cannot be controlled; for horizontal continuous casting, the melting and casting processes are separated in two Carried out on a single electric furnace, the melt also has the opportunity to contact oxygen during the converter, and the metal loss is also large
Therefore, these two processe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1. Smelting: Place the preferred 1# high-purity cathode copper in a cored power frequency induction furnace, raise the furnace temperature to melt into copper liquid, add lanthanum with a mass fraction of 0.012%, and keep the temperature of the copper liquid at 1160°C. The surface of the liquid is covered with a selected charcoal layer, the charcoal particle size is 45mm, and the thickness of the charcoal layer is 100mm, so that the copper liquid is always isolated from oxygen;

[0032] Step 2, upward continuous casting: insert the graphite crystallizer with pistil directly into the copper liquid to a depth of 23mm, the graphite crystallizer with pistil is cooled by induction cooling with water spacer, and the copper liquid is inside the graphite crystallizer with pistil Condensate into a solid, and the upper end of the solid is drawn by a drafting mechanism to make an oxygen-free copper hollow billet. This upward continuous casting can use 6 crystallizers to pull ...

Embodiment 2

[0044] Step 1, smelting: put the preferred 1# high-purity cathode copper in a cored power frequency induction furnace, raise the furnace temperature to melt into copper liquid, add lanthanum with a mass fraction of 0.013%, and keep the temperature of the copper liquid at 1170°C, the copper The surface of the liquid is covered with a selected charcoal layer, the charcoal particle size is 50mm, and the thickness of the charcoal layer is 110mm, so that the copper liquid is always isolated from oxygen;

[0045] Step 2, upward continuous casting: insert the graphite crystallizer with pistil directly into the copper liquid to a depth of 25mm, the graphite crystallizer with pistil is cooled by induction cooling with a water spacer, and the copper liquid is inside the graphite crystallizer with pistil Condensate into a solid, and the upper end of the solid is drawn by a drafting mechanism to make an oxygen-free copper hollow billet. This upward continuous casting can use 6 crystallize...

Embodiment 3

[0057] Step 1. Smelting: Place the preferred 1# high-purity cathode copper in a cored power frequency induction furnace, raise the furnace temperature to melt into copper liquid, add lanthanum with a mass fraction of 0.015%, and keep the temperature of the copper liquid at 1180°C. The surface of the liquid is covered with a selected charcoal layer, the charcoal particle size is 55mm, and the thickness of the charcoal layer is 120mm, so that the copper liquid is always isolated from oxygen;

[0058] Step 2. Upward continuous casting: insert the graphite crystallizer with pistils directly into the copper liquid to a depth of 28mm. The graphite crystallizer with pistils is cooled by induction cooling with a water spacer, and the copper liquid is inside the graphite crystallizer with pistils Condensate into a solid, and the upper end of the solid is drawn by a drafting mechanism to make an oxygen-free copper hollow billet. This upward continuous casting can use 6 crystallizers to ...

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Abstract

The invention relates to a preparation method for an oxygen-free copper tube for a magnetron. The preparation method is characterized in that the contents of copper and silver in a material of the oxygen-free copper tube is larger than or equal to 99.97%, and oxygen content is smaller than or equal to 0.001%. The preparation method includes following process steps: 1, smelting: placing number 1 high-purity cathode copper in a power frequency induction furnace with a core, raising the temperature of the furnace to smelt the cathode copper into copper liquid, adding lanthanum with the mass fraction ranging from 0.01% to 0.016% into the copper liquid, keeping the copper liquid at the temperature of 1170 +/-10 DEG , and covering a charcoal layer with the thickness ranging from 100mm to 120mm and the charcoal granularity ranging from 40mm to 60mm on the surface of the copper liquid; 2, upward continuous casting; 3, precise cold rolling; 4, recrystallization; 5, cold drawing forming; and 6,finishing. The oxygen content is low, electric conduction is excellent, yield is high, and metal loss is low.

Description

technical field [0001] The invention relates to a preparation method of an oxygen-free copper tube for a magnetron, belonging to the technical field of nonferrous metal processing. Background technique [0002] The basic principle of a microwave oven is to use a magnetron to convert electrical energy into microwave energy to achieve the purpose of heating food. Therefore, the magnetron, as the heart of a microwave oven, is made of high-precision, high-purity oxygen-free copper tubes. In the past, most of them relied on imports. And import prices are high, breaking the bottleneck of domestic microwave oven production, exploring new techniques and methods for the production of oxygen-free copper tubes for magnetrons, achieving engineering production of oxygen-free copper tubes, and improving the production efficiency and quality of oxygen-free copper tubes has become a hot topic . [0003] The traditional production process mostly adopts the process of vertical semi-continuou...

Claims

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Application Information

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IPC IPC(8): C22B15/14B22D11/00B22D11/14H01J25/50H01J23/05
Inventor 常正伟赵敏杰
Owner 江阴和宏特种材料有限公司
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