Spherical high-chromium high-copper alloy powder for 3D printing and preparation method of alloy powder

A 3D printing and copper alloy technology, applied in the field of spherical high-chromium copper alloy powder for 3D printing and its preparation, can solve the problems of the introduction of inclusions and the macrosegregation of powder in the process of spherical high-chromium copper alloy powder, so as to reduce the risk of clogging , The droplet size is small, and the effect of preventing secondary oxygenation

Active Publication Date: 2020-04-28
中航迈特粉冶科技(徐州)有限公司
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  • Claims
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Problems solved by technology

[0006] The main purpose of the present invention is to provide a spherical high-chromium copper alloy powder for 3D printing and its preparation method. The spherical high-chromium copper alloy powder for 3D printing prepared by the method has low oxygen content and nitrogen content, and no

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  • Spherical high-chromium high-copper alloy powder for 3D printing and preparation method of alloy powder
  • Spherical high-chromium high-copper alloy powder for 3D printing and preparation method of alloy powder
  • Spherical high-chromium high-copper alloy powder for 3D printing and preparation method of alloy powder

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[0052] The invention discloses a method for preparing spherical high-chromium copper alloy powder for 3D printing. figure 1 It is a schematic flow chart of the preparation method of the spherical high-chromium copper alloy powder for 3D printing provided in the embodiments of the present invention, such as figure 1 As shown, the preparation method mainly includes the following steps:

[0053] In step S0, the copper-chromium alloy is prepared into a copper-chromium alloy rod as an induction electrode by using a vacuum induction casting process, and then the head is processed to figure 2 Dimensions shown, form a bar with a conical tip; or use powder compaction to prepare a bar with a conical tip; wherein, the chromium content in the bar is 2 to 50% by mass percentage; The diameter is 20-105mm, and the length is 100-1000mm; the cone angle at the top of the bar is 45-135°, and the diameter of the cone tip at the top of the bar is 10-20mm.

[0054] It should be noted that the me...

Example Embodiment

[0072] Example 1:

[0073] Step S0, processing the copper-chromium alloy rod with a chromium content of 40% (mass ratio) by vacuum induction melting into an electrode with a diameter of 40 mm, a length of 600 mm, a taper angle at one end of the bar stock is 90°, and a tip diameter at one end of the taper angle is 15 mm. Bar stock, and the bar stock is installed on the feeding device.

[0074] Step S1, vacuumize the whole device, the degree of vacuum is 10 -1 Pa, and filled with argon gas protection, the pressure of the argon gas protection environment is -0.005 ~ 0.005Mpa; the electrode bar moves from the first limit position to the second limit position at a rotation speed of 140r / min and a descending speed of 1000mm / min bit position.

[0075] Step S2, turn on the exhaust fan and exhaust valve to maintain a slight negative pressure inside the system, and at the same time, fill the upper chamber of the atomizer with gas to keep the pressure difference between the upper and l...

Example Embodiment

[0079] Example 2:

[0080] The preparation method in embodiment 2 is the same as the preparation method in embodiment 1, and the difference is that the preparation process parameters are different, specifically as follows:

[0081] In step S0, the rod stock is an electrode rod with a diameter of 105 mm and a length of 1000 mm processed from a copper-chromium alloy with a chromium content of 50% (mass ratio). ;

[0082] In step S1, the electrode rod moves from the first limit position to the second limit position at a rotation speed of 40r / min and a descending speed of 2000mm / min;

[0083] In step S2, the power of the exhaust fan is 22Kw, the wind pressure is 10000Pa, and the air volume is 1000m 3 / h, the pressure of the protective gas pipeline leading into the upper cavity of the nozzle is 0.1Mpa, and the flow rate is 20m 3 / h; the high-frequency heating power supply is 30Kw, the frequency is 250KHz, and the copper-chromium alloy electrode rod is heated by induction with a co...

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Abstract

The invention provides a spherical high-chromium high-copper alloy powder for 3D printing and a preparation method of the alloy powder. The preparation method comprises the following steps of first, feeding, wherein in a shield gas environment, a bar stock is enabled to carry out autorotation and moves from one limiting position to another limiting position by being driven by a feeding mechanism at a preset feeding speed; second, smelting, wherein the gas pressure state inside a system is adjusted, vacuum induction smelting is carried out on the bar stock to melt a top conical surface of the bar stock, and the molten top conical surface gathers at a top conical tip of the bar stock to form droplets; third, atomization powder making, wherein atomization treatment is carried out on the droplets in an atomizer to obtain metal powder; and fourth, grading, wherein in the shield gas environment, size grading treatment is carried out on the metal powder which is sufficiently cooled to obtainthe high-chromium high-copper alloy powder which meets requirements. The powder obtained by adopting the preparation method is relatively low in oxygen content and nitrogen content without introducedimpurities, and no macrosegregation appears.

Description

technical field [0001] The invention relates to the technical fields of 3D printing and powder metallurgy, in particular to a spherical high-chromium copper alloy powder for 3D printing and a preparation method thereof. Background technique [0002] Copper-chromium alloy is a high-strength and high-conductivity copper alloy material with good comprehensive properties, and has attracted extensive attention from the electronics, electric power, transportation and aerospace industries because of its excellent electrical properties. Its main features are: Compared with other alloy materials, it has higher strength and better electrical and thermal conductivity. At present, the most effective way to improve the strength of copper-chromium alloy is to increase the chromium content in the alloy. According to the research, the size of the chromium-rich phase in the alloy is refined to obtain a supersaturated copper-chromium solid solution and distribute it uniformly in the copper ma...

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Application Information

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IPC IPC(8): B22F9/08B22F1/00B33Y40/00B33Y70/00
CPCB22F9/082B33Y70/00B33Y40/00B22F2009/0848B22F2009/0836B22F1/065Y02P10/25
Inventor 张飞高正江王山马腾张建殷雷
Owner 中航迈特粉冶科技(徐州)有限公司
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