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Preparation method of CoCrMo alloy powder for 3D printing

An alloy powder and 3D printing technology, applied in the field of additive manufacturing, can solve the problems of unsuitable 3D printing technology, coarse powder particle size, high powder inclusion content, etc., and achieve proper proportioning relationship, good powder fluidity, and impurity and oxygen content low effect

Inactive Publication Date: 2019-04-05
SHANGHAI RES INST OF MATERIALS CO LTD
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Problems solved by technology

Compared with the two, the particle size of the powder produced by the atomization method is finer, but the traditional atomization process is easy to cause high powder inclusion content, satellite ball, hollow ball powder; the powder prepared by the plasma rotating electrode method has high sphericity and high purity, but The particle size of the powder is relatively coarse, which is not suitable for 3D printing technology. Therefore, it is very important to adopt a new atomization technology and integrate a series of powder treatment processes to provide a method for preparing alloy powder for 3D printing.

Method used

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  • Preparation method of CoCrMo alloy powder for 3D printing
  • Preparation method of CoCrMo alloy powder for 3D printing

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preparation example Construction

[0029] A preparation method for CoCrMo alloy powder for 3D printing, comprising the following steps:

[0030] (1) Alloy smelting: Vacuum induction smelting is carried out on the CoCrMo alloy raw material to obtain an alloy melt;

[0031] (2) Atomized pulverization: Pour the alloy melt into the middle leakage bag, open the leakage valve, and the alloy melt flows into the gas atomization furnace freely through the leak hole at the bottom of the middle leakage bag, under the impact of the supersonic airflow , the alloy melt is crushed into fine droplets, cooled and solidified to obtain CoCrMo alloy powder, the powder lands at the bottom of the atomization tower, and then is brought into the powder collection device under the cyclone by the gas;

[0032] (3) Powder screening: the CoCrMo alloy powder obtained in step (2) is subjected to bouncing ball vibration screening; then the powder obtained by vibration screening is carried out to airflow classification;

[0033] In step (1),...

Embodiment 1

[0039] This embodiment is mainly aimed at the alloy raw materials for secondary smelting, and adopts the following steps to prepare CoCrMo alloy powder for SLM technology:

[0040] (1) Alloy remelting: put 50kg of CoCrMo alloy raw material into vacuum induction furnace for melting, the alloy composition is Co: balance, Cr: 27.8%, Mo: 6.2%, Ni≤0.1%, Fe≤0.01%, C≤0.02 %, Si≤0.5%, Mn≤0.2%. The vacuum degree of the melting furnace is 7.8×10 -3 Pa, after the raw materials are completely melted, the temperature of the molten steel is controlled at 1630°C, and the temperature is kept for 20 minutes, while the middle leakage bag is heated to 1180°C;

[0041] (2) Atomization pulverization: open the leakage valve, and the alloy melt flows freely downward into the gas atomization furnace through the leakage hole at the bottom of the middle leakage bag. The atomization pressure in the gas atomization furnace is 2.0MPa. Under the impact of the flow, the alloy melt is crushed into fine dro...

Embodiment 2

[0045] CoCrMo alloy powders for SLM technology were prepared using the following steps:

[0046] (1) Alloy smelting: Put 50kg of CoCrMo alloy raw material into vacuum induction furnace for smelting, the alloy composition is Co: balance, Cr: 28.8%, Mo: 6.1%, Ni≤0.2%, Fe≤0.03%, C≤0.02% , Si≤0.1%, Mn≤0.2%. Melting furnace vacuum degree 9.1×10 -3 Pa, after the raw materials are completely melted, the temperature of the alloy liquid is controlled at 1640°C and kept for 20 minutes, and the middle leakage bag is heated to 1170°C at the same time;

[0047] (2) Atomized pulverization: pour the alloy melt into the middle leakage bag, open the leakage valve, the alloy melt flows freely downward into the gas atomization furnace through the leakage hole at the bottom of the middle leakage bag, and the mist in the gas atomization furnace The melting pressure is 3.0MPa. Under the impact of high-purity nitrogen flow, the alloy melt is crushed into fine droplets, and after cooling and solidi...

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Abstract

The invention relates to a preparation method of CoCrMo alloy powder for 3D printing. The method adopts the vacuum induction melting technology and the tight coupling gas atomization technology, a vibrating screening and airflow classification method is used for conducting particle size distribution on the powder, and the CoCrMo alloy powder suitable for the laser selective melting technology is prepared. Compared with the prior art, the CoCrMo alloy powder prepared by the method has the characteristics of high sphericity, uniform particle size distribution, the low oxygen content, the low impurity content and the like, the performance requirements of the laser selective melting technology for a powder material are met, and the development of the metal additive manufacturing technology ispromoted.

Description

technical field [0001] The invention relates to a method for preparing metal powder, in particular to a method for preparing CoCrMo alloy powder for 3D printing, and belongs to the field of additive manufacturing. Background technique [0002] 3D printing is a manufacturing technology that uses lasers or electron beams, based on three-dimensional modeling, to add accumulation materials layer by layer under computer control to directly form parts quickly and accurately, also known as "additive manufacturing". Additive manufacturing technology does not require traditional tools, fixtures, and multiple processing procedures. Using 3D design data, it can quickly and accurately manufacture parts of any complex shape on one device. Compared with the traditional method of material removal (or deformation) Processing and common special processing technology, additive manufacturing technology has a very high material utilization rate. [0003] Selective Laser Melting (SLM) is a meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00C22C19/07B33Y70/00
CPCC22C19/07B22F9/082B33Y70/00B22F2009/088B22F2009/0896B22F1/065
Inventor 吴凯琦朱德祥吴文恒卢林王涛杨启云
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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