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Method for preparing Cu-Cr alloy powder by means of vacuum gas atomization

A technology of alloy powder and vacuum air, which is applied in the field of preparation of copper alloy powder, can solve the serious shape and irregularity of Cu-Cr alloy powder oxidation, and achieve the effects of electrical conductivity recovery, strength improvement and oxidation avoidance

Inactive Publication Date: 2018-02-09
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing Cu-Cr alloy powder by vacuum atomization, which solves the problem of severe oxidation and irregular shape of Cu-Cr alloy powder prepared by the existing atomization method

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  • Method for preparing Cu-Cr alloy powder by means of vacuum gas atomization
  • Method for preparing Cu-Cr alloy powder by means of vacuum gas atomization

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Step 1: Evacuate the melting chamber and atomization chamber in the vacuum atomization furnace to a vacuum state with a pressure of 5x10 -3 Pa;

[0024] Step 2: Put Cu and Cr into the graphite crucible in the melting chamber, and fill the melting chamber with N 2 As a protective gas, the graphite crucible is heated by high-frequency induction equipment to obtain the alloy liquid, and the heat preservation makes the superheat of the alloy liquid reach 50°C, ready to start atomization;

[0025] Step 3: Adjust the atomization pressure to 4MPa, spray the alloy liquid obtained in step 2 into the atomization chamber through a graphite nozzle, atomize and crush to obtain Cu-Cr alloy powder, wherein, open the exhaust valve after atomization for 3s to ensure The pressure in the atomization chamber will not be too high. After the atomization of the alloy liquid is completed, the exhaust valve is closed to prevent the oxidation of the alloy powder. After completion, the oxygen co...

Embodiment 2

[0027] Step 1: Evacuate the melting chamber and atomization chamber in the vacuum atomization furnace to a vacuum state with a pressure of 5x10 -3 Pa;

[0028] Step 2: Put Cu and Cr into the graphite crucible in the melting chamber, and fill the melting chamber with N 2 As a protective gas, the graphite crucible is heated by high-frequency induction equipment to obtain the alloy liquid, and the heat preservation makes the superheat of the alloy liquid reach 150°C, ready to start atomization;

[0029] Step 3: Adjust the atomization pressure to 5MPa, spray the alloy liquid obtained in step 2 into the atomization chamber through a graphite nozzle, and atomize and crush it to obtain Cu-Cr alloy powder, wherein, after atomization is carried out for 3s, open the exhaust valve to ensure The pressure in the atomization chamber will not be too high. After the atomization of the alloy liquid is completed, the exhaust valve is closed to prevent the oxidation of the alloy powder. After c...

Embodiment 3

[0031] Step 1: Evacuate the melting chamber and atomization chamber in the vacuum atomization furnace to a vacuum state with a pressure of 6x10 -3 Pa;

[0032] Step 2: Put Cu and Cr into the graphite crucible in the melting chamber, and fill the melting chamber with N 2 As a protective gas, the graphite crucible is heated by high-frequency induction equipment to obtain the alloy liquid, and the heat preservation makes the superheat of the alloy liquid reach 150°C, ready to start atomization;

[0033] Step 3: Adjust the atomization pressure to 6MPa, spray the alloy liquid obtained in step 2 into the atomization chamber through a graphite nozzle, atomize and crush to obtain Cu-Cr alloy powder, wherein, open the exhaust valve after atomization for 3s to ensure The pressure in the atomization chamber will not be too high. After the atomization of the alloy liquid is completed, the exhaust valve is closed to prevent the oxidation of the alloy powder. After completion, the oxygen c...

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Abstract

The invention discloses a method for preparing Cu-Cr alloy powder by means of vacuum gas atomization. The method comprises the following steps that 1, a smelting chamber and an atomizing chamber in avacuum atomizing furnace are vacuumized; 2, Cu and Cr are put into a graphite crucible in the smelting chamber, N2 is fed into the smelting chamber to serve as protective gas, the graphite crucible isheated, an alloy solution is obtained, heat preservation is conducted to enable the superheat degree of the alloy solution to reach 50 DEG C to 250 DEG C, and then atomization is prepared and started; and 3, the atomization pressure is adjusted to range from 4 MPa to 6 MPa, the alloy solution obtained in the second step is sprayed into the atomizing chamber through a graphite nozzle, atomizationcrushing is conducted, and then the Cu-Cr alloy powder is obtained. The oxygen content of the obtained powder is lower than 0.08% and much smaller than that of powder obtained through ordinary atmospheric atomization; and in the vacuum gas atomization process, the yield of fine powder smaller than 50 micrometers can reach 60% or above.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of copper alloy powders, and in particular relates to a method for preparing Cu-Cr alloy powders by vacuum atomization. Background technique [0002] As a high-strength and high-conductivity copper alloy material, Cu-Cr alloy has good comprehensive properties and has attracted extensive attention because of its excellent mechanical properties. It is one of the important integrated circuit frame materials at present. At present, Cu-Cr alloys are mainly prepared by casting method and mechanical alloying method. The Cu-Cr alloys prepared by these two methods have coarse grains and segregation of components. However, the size of Cr in the alloy prepared by powder metallurgy depends on the diameter of Cr powder, so it is difficult to obtain Cu-Cr alloy with ultrafine Cr phase by this method. Therefore, the Cu-Cr alloy with excellent comprehensive properties can only be prepared by preparin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
CPCB22F9/082B22F2009/0844
Inventor 肖鹏李玉发梁淑华邹军涛
Owner XIAN UNIV OF TECH
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