Method for preparing GRCop-84 spherical powder based on plasma rotary atomization method

A grcop-84, rotary atomization technology, applied in the field of metal powder metallurgy, to achieve the effect of good fluidity, less inclusions, and low gas volume fraction

Active Publication Date: 2019-11-05
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign countries have strictly controlled the spherical powder used in copper alloy additive manufacturing, and there is no export to my country.

Method used

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  • Method for preparing GRCop-84 spherical powder based on plasma rotary atomization method
  • Method for preparing GRCop-84 spherical powder based on plasma rotary atomization method
  • Method for preparing GRCop-84 spherical powder based on plasma rotary atomization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing GRCop-84 spherical powder based on plasma rotary atomization method, is characterized in that, comprises the following steps:

[0025]S1: Select Cr: 5% according to the mass fraction; Nb: 4.5%; Cu: the balance, there is no obvious looseness, shrinkage cavity and other defects on the surface of the bar, and the electrolytic copper plate, chromium block, and niobium block are mixed and placed in the crucible to start melting and pouring After forging, a bar blank with a relative density ≥ 90% is obtained; the electrolytic copper plate, chromium block, and niobium block are mixed and smelted, and the prepared bar blank has no looseness, shrinkage cavity, etc. GRCop-84 alloy spherical powder prepared by atomization method has higher sphericity, higher bulk density and better fluidity;

[0026] S2: GRCop-84 rods with a diameter of 50 mm, a length of 800 mm, and a surface roughness of 1.6 μm are processed by a lathe;

[0027] S3: Put the GRCop-84 rod a...

Embodiment 2

[0031] A method for preparing GRCop-84 spherical powder based on plasma rotary atomization method, is characterized in that, comprises the following steps:

[0032] S1: Select Cr: 6.5% according to the mass fraction; Nb: 5.8%; Cu: the balance, there is no obvious looseness, shrinkage cavity and other defects on the surface of the bar, and the electrolytic copper plate, chromium block, and niobium block are mixed and placed in the crucible to start melting and pouring After forging, a bar blank with a relative density of 90% is obtained; the electrolytic copper plate, chromium block, and niobium block are mixed and smelted, and the prepared bar blank has no looseness, shrinkage cavity, etc. GRCop-84 alloy spherical powder prepared by chemical method has higher sphericity, higher bulk density and better fluidity;

[0033] S2: GRCop-84 rods with a diameter of 65 mm, a length of 1000 mm and a surface roughness of 1.6 μm are processed by a lathe;

[0034] S3: Put the GRCop-84 rod ...

Embodiment 3

[0038] A method for preparing GRCop-84 spherical powder based on plasma rotary atomization method, is characterized in that, comprises the following steps:

[0039] S1: Select Cr: 7% according to the mass fraction; Nb: 6.5%; Cu: the balance, there is no obvious looseness, shrinkage cavity and other defects on the surface of the bar, and the electrolytic copper plate, chromium block, and niobium block are mixed and placed in the crucible to start melting and pouring After forging, a bar blank with a relative density ≥ 90% is obtained; the electrolytic copper plate, chromium block, and niobium block are mixed and smelted, and the prepared bar blank has no looseness, shrinkage cavity, etc. GRCop-84 alloy spherical powder prepared by atomization method has higher sphericity, higher bulk density and better fluidity;

[0040] S2: GRCop-84 rods with a diameter of 80mm, a length of 1200mm, and a surface roughness of 1.6μm were processed by a lathe;

[0041] S3: Put the GRCop-84 rod a...

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Abstract

The invention discloses a method for preparing GRCop-84 spherical powder based on a plasma rotary atomization method. The method comprises the following steps of S1, smelting according to the proportion of elements and a specific adding mode, and forging after casting to obtain a bar blank; S2, machining the GRCop-84 bar meeting the requirement of the plasma rotary atomization method by using a lathe; S3, placing the GRCop-84 bar as a positive electrode in atomizing equipment, carrying out pre-pumping vacuum treatment on an atomizing chamber of whole powder making equipment, and then injectinginert protective gas; S4, starting the equipment, heating and melting the end surface of the GRCop-84 bar rotating at a high speed by using a plasma torch, and centrifugally condensing molten liquiddrops in the atomizing chamber; and S5, obtaining the GRCop-84 spherical powder through a powder collecting device, and screening and vacuum packaging according to requirements after the powder is completely cooled. According to the method, the GRCop-84 spherical powder which is uniform in particle size, high in sphericity and low in impurity content can be prepared in batches and stably.

Description

technical field [0001] The invention relates to the technical field of metal powder metallurgy, in particular to a method for preparing GRCop-84 spherical powder based on a plasma rotary atomization method. Background technique [0002] GRCop-84 alloy is the latest generation of hydrogen-oxygen engine inner wall material developed by the National Aeronautics and Space Administration Glenn Research Center. Cr and Nb in GRCop-84 alloy form Cr2Nb phase, the volume fraction of the second phase is about 14%, which is evenly distributed in the copper matrix, and the second phase is still stable when it exceeds 1600 °C. At the same time, a large amount of Cr2Nb hardening phase can largely refine and control the grain size of copper, which can further improve the strength of copper alloy. The material has excellent properties such as electrical conductivity, thermal expansion, strength, creep resistance, ductility and low-frequency fatigue, and its comprehensive performance is exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14B22F1/00C22C9/00
CPCB22F1/0007B22F9/14C22C9/00Y02P10/25
Inventor 李小阳庾高峰张航武旭红王文斌马明月吴斌
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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