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Preparation method of CuCrZr alloy powder for three-dimensional (3D) printing

A 3D printing and alloy powder technology, which is applied in the field of metal powder manufacturing, can solve the problems that affect the product quality of the 3D printing process, the large proportion of satellite powder and hollow powder, and the difficulty of mixing 3D printing components, so as to improve the efficiency of copper-chromium alloy electrodes. The effect of density, narrow particle size range and high sphericity

Active Publication Date: 2021-04-30
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing CuCrZr alloy powder preparation process is based on the "VIGA" process for vacuum atomization powder production, which is affected by factors such as refractory materials such as crucibles and tundishes and atomization pressure during the atomization process. Many impurities, poor composition accuracy, poor sphericity, a large proportion of satellite powder and hollow powder, and a wide range of powder particle sizes have seriously affected the product quality of the 3D printing process, and the raw materials, especially "Zr", are extremely active. In the molten state, it is very easy to react with the medium it is in contact with, and the composition is difficult to control, which brings difficulties to the final 3D printing composition deployment. In addition, due to the existence of a tundish in the conventional VIGA process, it is often caused by the metal at the draft tube during the atomization process. The melt cools too fast and blocks the package, resulting in atomization failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing CuCrZr alloy powder for 3D printing, comprising the following steps:

[0029] S1 ingredients: Cu powder, Cr powder, and Zr powder are weighed according to weight percentage, wherein the content of Cr is 3.5%, the content of Zr is 0.75%, and Cu is the balance; the particles of the Cu powder are under the 200 mesh sieve The particles of Cr powder are 220 mesh sieves, and the particles of Zr powder are 350 mesh sieves; by controlling and selecting suitable raw materials, the prepared CuCrZr alloy powder has a narrow particle size range and high sphericity, which effectively ensures 3D printing. process stability;

[0030] S2 powder mixing: the weighed Cr powder and Zr powder are manually stirred and mixed and mixed by ball milling. The ball-to-material ratio was ball milled and mixed for 1.5 h; then the Cr powder and Zr powder mixed by manual stirring were mixed into the weighed Cu powder, and ethanol was added according to 7 / 24 of the total weight ...

Embodiment 2

[0037] This embodiment is basically the same as Example 1, except that the present embodiment also defines the method for the complete volatilization of ethanol, specifically:

[0038] The method for completely volatilizing ethanol in the mixed powder in step S3 is as follows: place the mixed mixed powder in a vacuum box to evacuate and fill it with argon, then apply far-infrared rays to irradiate the mixed powder and slowly stir it, the Slow stirring is carried out at a stirring speed of 25 rpm. Using this stirring speed for stirring can avoid too fast or too slow stirring to cause ethanol to completely volatilize. The treatment time is too long or incompletely volatilized. W, its radiation wavelength is 9 μm. Using the above method to volatilize the ethanol can reduce the residual substances in the mixed powder caused by problems such as the purity of the ethanol, thereby improving the use effect of the subsequent CuCrZr alloy powder.

Embodiment 3

[0040] This embodiment is basically the same as Embodiment 1, the difference is that this embodiment also defines the gradient heating method, specifically:

[0041] The method of gradient heating in the step S4 is as follows: heat up the pressed copper-chromium alloy blank at 45 °C / min to 480 °C for 90 min, then perform a second heating stage, and heat up to 975 °C at 90 °C / min Keep for 2 h, wherein, during the second heating stage, apply a pulse current to the copper-chromium alloy billet until the end of the heating stage, the pulse current adopts a square wave pulse current, and the pulse intensity is 1100 A. The wave pulse current can significantly promote the sintering density of the alloy powder in the second heating stage and promote the alloying of the copper-chromium alloy electrode, thus providing a basis for obtaining alloy powders with lower gas content and higher sphericity. Through the above-mentioned gradient heating process The alloying and densification of th...

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Abstract

The invention discloses a preparation method of CuCrZr alloy powder for three-dimensional (3D) printing. The preparation method comprises the steps of S1, burdening: weighing Cu powder, Cr powder and Zr powder in proportion; S2, mixing the powder: stirring and mixing the Cr powder and the Zr powder, then mixing with the Cu powder, adding ethyl alcohol, conducting ball milling and powder mixing after even stirring, and obtaining mixed powder; S3, conducting cold isostatic pressing: after the ethyl alcohol in the mixed powder is completely volatilized, conducting cold isostatic pressing to obtain a copper-chromium alloy blank; S4, sintering and degassing: carrying out gradient heating on the copper-chromium alloy blank to obtain a copper-chromium alloy electrode; S5, conducting electrode induction gas atomization powder making: conducting zone melting and gas atomization powder making on the copper-chromium alloy electrode, and obtaining the CuCrZr alloy powder; and S6, screening: screening and grading the CuCrZr alloy powder, and obtaining the required powder within the 3D printing particle size range. The CuCrZr alloy powder prepared through the method provided by the invention is narrow in particle size range and high in sphericity degree, and the stability of the 3D printing process is effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of metal powder manufacturing, in particular to a method for preparing CuCrZr alloy powder for 3D printing. Background technique [0002] CuCrZr alloy is widely used in rail transit, aerospace, integrated circuit lead frame, heat exchange materials and other fields because of its good high strength, high conductivity and high temperature resistance. With the development of 3D printing technology, with the help of the "sudden Cold" makes the "solid solution process" fully carried out, which further improves the high strength, high conductivity and high temperature resistance of CuCrZr materials. [0003] However, the existing CuCrZr alloy powder preparation process is based on the "VIGA" process for vacuum atomization powder production, which is affected by factors such as refractory materials such as crucibles and tundishes and atomization pressure during the atomization process. Many impurities, poor compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00C22C9/00B33Y70/00
CPCB22F9/082C22C9/00B33Y70/00B22F1/14
Inventor 张石松王小军刘凯
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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