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High-fluidity powder material for selective laser sintering

A laser sintering and high fluidity technology, applied in the field of 3D printing consumables, can solve the problems of high process control requirements, difficult application, complicated process, etc., and achieve the effects of wide application range, reduced shrinkage rate, and improved dimensional stability

Inactive Publication Date: 2014-11-12
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above methods 1)-3) have strong selectivity to materials, and are difficult to apply to some high-performance insoluble and infusible materials, such as polyether ether ketone, polyimide, etc.; 4) there are complex processes and high requirements for process control 5) there is a problem that the toughness of the product is reduced while increasing the strength

Method used

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  • High-fluidity powder material for selective laser sintering

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, the method for preparing a high fluidity powder material for selective laser sintering includes the following steps:

[0029] 1) Select 97 parts of polyether ether ketone powder with an average diameter of 70 μm, and 3 parts of nano-SiO 2 ;

[0030] 2) Step 1) selected nano-SiO 2 Disperse in ethanol solution, stir for 30 minutes until uniform, add 0.15 parts of silane coupling agent, continue stirring for 30 minutes, filter with suction, and dry to constant weight;

[0031] 3) The polyether ether ketone powder selected in step 1) and the nano-SiO modified in step 2) 2 The desired composite powder is obtained by mechanical stirring and mixing.

Embodiment 2

[0033] The method for preparing high fluidity powder material for selective laser sintering in this embodiment is as follows figure 1 shown, including the following steps:

[0034] 1) Select 95 parts of polyamide powder with an average diameter of 120 μm, 5 parts of nano-SiO 2 and nano Al 2 o 3 mixture;

[0035] 2) 3 parts of step 1) selected nano-SiO 2 Add 0.05 parts of silane coupling agent to the ethanol solution, then use high-energy ultrasonic (20kHz, 4000W) to treat for 3h, filter out the ethanol, wash 3-5 times, and dry to obtain modified nano-SiO 2 ;

[0036] 3) Step 1) selected polyamide powder, step 2) modified nano-SiO 2 and step 1) unmodified nano-SiO 2 Mix to obtain the desired composite powder.

Embodiment 3

[0038] In this embodiment, the method for preparing a high fluidity powder material for selective laser sintering includes the following steps:

[0039] 1) Select 96 parts of polyethersulfone powder with an average diameter of 40 μm, 4 parts of nano-nano TiO 2 and carbon nanotube mixtures;

[0040] 2) the step 1) selected polyethersulfone powder and nano-SiO 2 The desired composite powder is obtained by mechanical stirring and mixing.

[0041] The performance of the composite powder obtained in Example 1 was tested and compared with the polyether ether ketone powder without adding nanomaterials, the results are shown in Table 1:

[0042] Table 1 Example 1 Composite powder and pure PEEK powder performance comparison

[0043] Performance

Pure PEEK powder

Add 3% SiO 2 PEEK powder

pressure drop, PD 15.2 (mbar)

3.87

2.23

Basic kinetic energy, BFE(mJ)

39.5

25.6

Activation energy, AE(mJ)

<5mJ

<5mJ

Flow funct...

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Abstract

The invention discloses a high-fluidity powder material for selective laser sintering. The high-fluidity powder material comprises a plastic powder body and inorganic nanometer materials, wherein the diameter of the plastic powder body ranges from 40 micrometers to 150 micrometers, the weight of the inorganic nanometer materials accounts for 0.01% to 5% of the total weight of the high-fluidity powder material, and the inorganic nanometer materials are surface-modified inorganic nanometer particles or unmodified inorganic nanometer materials. According to high-fluidity powder material for selective laser sintering, a small number of modified or unmodified inorganic nanometer materials are added into the plastic powder body, due to the fact that the nanometer materials are special in structure, are in the unstable thermodynamics status and have the unique surface interface effect, the fluidity of the powder body and the apparent density of the powder body can be remarkably enhanced, and the high-fluidity powder material is more suitable for SLS sintering. According to the high-fluidity powder material for selective laser sintering, no special requirements for types of plastic powder bodies exist, and the application range is wide.

Description

technical field [0001] The invention belongs to the field of 3D printing consumables, and relates to a powder for 3D printing, in particular to a high fluidity powder material for selective laser sintering. Background technique [0002] Additive manufacturing technology, also known as "3D printing technology", is a new type of manufacturing technology that is currently receiving high attention. Together with robot technology and artificial intelligence technology, it is called the key technology to promote the third industrial revolution. Selective laser sintering (SLS) is a very important technology in 3D printing. The SLS process is based on the principle of discrete / stacking forming, integrating new technologies such as computer, numerical control, laser and new materials, and selectively sintering metal or non-metal powder materials to quickly prepare products. The laser power required for polymer SLS sintering is small and not limited by the complexity of the shape of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08L69/00C08L79/08C08L71/10C08L81/06C08L81/02C08L27/18C08K9/04C08K9/06C08K3/36C08K3/22C08K7/24C08K3/04C08K7/06
CPCC08K9/06C08K3/22C08K3/36C08K7/24C08K2003/2227C08K2201/011C08L2201/08C08L61/16C08L77/00C08L81/06
Inventor 饶先花
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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