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Preparation methods for copper-chromium intermediate alloy and copper-chromium-zirconium alloy

A master alloy, copper chromium zirconium technology, applied in the preparation of copper chromium zirconium alloy, copper chromium master alloy preparation field, can solve the problem of chromium content fluctuation in copper chromium zirconium alloy, achieve stable yield, high yield , to avoid the effect of bringing in impurities

Inactive Publication Date: 2014-05-28
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] If there is concentrated distribution of unmelted chromium in the vacuum smelted copper-chromium master alloy, when it is used for copper-chromium-zirconium alloy smelting, the chromium content in the copper-chromium-zirconium alloy will fluctuate

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0013] 1. Preparation of copper-chromium master alloy

[0014] In the vacuum melting furnace, put 54.8kg of copper ingot into the bottom of the graphite crucible, and put 3.5kg of chromium with a particle size of 10-50mm into four equal parts of the feeding hopper. After the filling is completed, the lid is closed and vacuumed, and when the vacuum degree is less than 10Pa, it is powered on for heating. Stop vacuuming when the copper block starts to melt, and fill it with 0.01-0.02MPa argon. Continue to send electricity until the copper block is completely melted, add metal chromium in batches through the hopper, control the time interval between the front and back batches of metal chromium, and add the next batch of metal chromium after the previous batch of metal chromium is basically completely melted. After metal chromium is added, refine for 15 minutes. After refining, adjust the temperature of copper liquid to 1200~1250℃, and then start pouring. After the copper-chromiu...

Embodiment 2

[0019] 1. Preparation of copper-chromium master alloy

[0020] In the vacuum smelting furnace, 50.6 kg of copper ingots weighed into the bottom of the graphite crucible are loaded into the bottom of the graphite crucible, and 4.4 kg of chromium with a particle size of 10-50 mm are quartered into four sub-bins of the feeding hopper. After the filling is completed, the lid is closed and vacuumed, and when the vacuum degree is less than 10Pa, it is powered on for heating. Stop vacuuming when the copper block starts to melt, and fill it with 0.01-0.02MPa argon. Continue to send electricity until the copper block is completely melted, add metal chromium in batches through the hopper, control the time interval between the front and back batches of metal chromium, and add the next batch of metal chromium after the previous batch of metal chromium is basically completely melted. After metal chromium is added, refine for 15 minutes. After refining, adjust the temperature of copper liq...

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Abstract

The invention discloses preparation methods for a copper-chromium intermediate alloy and copper-chromium-zirconium alloy. The preparation method for the copper-chromium intermediate alloy comprises the following steps: (1) selecting chromium with the particle size of 10-50 mm, placing a copper block at the bottom of a graphite crucible, and placing the chromium into branch bins of a charging hopper; (2) vacuumizing the graphite crucible, energizing the graphite crucible for heating, stopping vacuumizing when the copper block starts to melt, and charging argon gas of which the pressure is 0.01-0.02 MPa; (3) continuously energizing the graphite crucible till the copper block fully melts, adding chromium in batches through the charging hopper, controlling the interval between the addition time of the previous batch of chromium and the addition time of the subsequent batch of chromium, and adding the subsequent batch of chromium after the previous batch of chromium metal fully melts; (4) after finishing the adding of the chromium, refining for 15 minutes, adjusting the temperature to 1,200-1,250 DEG C, and casting for forming the copper-chromium intermediate alloy. When the copper-chromium intermediate alloy is used for preparing the copper-chromium-zirconium alloy, the higher and stable chromium yield can be achieved, and the smelting time of the copper-chromium-zirconium alloy can be shortened; moreover, impurities are prevented by using the graphite crucible.

Description

technical field [0001] The patent of the present invention relates to vacuum induction smelting technology, in particular to a preparation method of a copper-chromium master alloy and a preparation method of a copper-chromium-zirconium alloy. Background technique [0002] Copper-chromium-zirconium alloy refers to an alloy formed by adding chromium and zirconium with copper as the matrix. After heat treatment, it has high strength and hardness, good electrical and thermal conductivity and corrosion resistance, and can be used to prepare resistance welding electrodes, contact materials and integrated circuit lead frames. Among the current preparation methods, the alloy prepared by vacuum melting method has the advantages of bulk, compactness and low gas content, so it is the most widely used. However, during vacuum melting, there are also low yields of chromium and large fluctuations in the content range. Crucible materials It is easy to bring in impurities and other problems...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/03C22C9/00
Inventor 付红亮冯兆龙
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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