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Method for sintering polymer composite powder material at low temperature

A composite powder, low-temperature sintering technology, applied in the field of additive manufacturing, can solve the problems of high layer thickness that cannot be sintered, limited 3D molding speed, large laser energy loss, etc., to improve anisotropy, excellent electrical conductivity, and reuse. high sex effect

Active Publication Date: 2021-03-05
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, due to the relatively poor penetration of the laser on the powder, the laser is more likely to penetrate deeper through the refraction scheme and irradiate the surface of the polymer powder. However, due to the large energy loss of the laser after multiple refractions of the polymer, it cannot Sintering has a high layer thickness, so the sintering efficiency is low, and the polymer powder will not be completely melted, which also limits the 3D molding speed

Method used

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  • Method for sintering polymer composite powder material at low temperature
  • Method for sintering polymer composite powder material at low temperature

Examples

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Embodiment 1

[0027] Step 1: Add 85 parts of nylon 1212 powder with an average particle size of 60 μm and 15 parts of iron powder with an average particle size of 25 μm into a mixing device, and perform physical mixing to obtain a composite powder of nylon 1212 and iron powder;

[0028] Step 2: Put the composite powder of nylon 1212 and iron powder prepared above into the selective laser sintering equipment using a fiber laser with a wavelength of 1080mm as the laser source. The maximum power of the fiber laser is 500W, and the layer thickness is 0.1mm , the composite powder of nylon 1212 and iron powder is heated to 50°C (138°C) below the melting point of nylon 1212 powder, and then the powder is melted with a sintering power of 500W laser, and the sintering line spacing is 0.3mm to prepare nylon 1212 and iron powder. Powder sintered workpiece.

Embodiment 2

[0030] Step 1: Add 95 parts of polyethylene powder with an average particle size of 80 μm and 5 parts of copper powder with an average particle size of 50 μm into a stirring device for physical mixing;

[0031] Step 2: Put the composite powder of polyethylene and copper powder prepared above into the selective laser sintering equipment that uses the optical fiber as the laser source with a wavelength of 2000nm. The maximum power range of the fiber laser is 200W, and the layer thickness is 0.2 mm, the composite powder of polyethylene and copper powder is heated to 10°C below the melting point of polystyrene powder, and then the powder is melted with a sintering power of 50W laser, and the sintering line spacing is 0.08mm to prepare a sintered workpiece.

Embodiment 3

[0033] Step 1: Add 90 parts of polyurethane powder with an average particle size of 75 μm and 10 parts of nickel powder with an average particle size of 45 μm into a stirring device for physical mixing;

[0034] Step 2: Put the composite powder of polyurethane and nickel powder prepared above into the selective laser sintering equipment that uses optical fiber with a wavelength of 1060nm as the laser source. The maximum power range of the fiber laser is 300W, and the layer thickness is 0.1mm , the composite powder of polyurethane and nickel powder is heated to 20°C below the melting point of polyurethane powder, and then the powder is melted with a sintering power of 300W laser, and the sintering line spacing is 0.08mm to prepare a sintered workpiece.

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Abstract

The invention provides a method for sintering a polymer composite powder material at low temperature. The method comprises the following steps: evenly mixing polymer powder and metal powder accordingto the mass part ratio of (70-95): (5-30) to prepare the polymer composite powder material sintered at low temperature; and placing the polymer composite powder material sintered at low temperature inselective laser sintering equipment with a fiber laser as a light source to be sintered so as to obtain a workpiece, wherein the specific sintering process includes that the thickness of a powder layer is 0.05-0.2 mm, the preheating temperature of the polymer composite powder material sintered at low temperature is 10-150 DEG C lower than the melting point of the polymer composite powder materialsintered at low temperature, the sintering power of the fiber laser is 50-2000 W, and the sintering linear distance is 0.08-0.5 mm. The polymer composite powder material is prepared, the selective sintering equipment with the fiber laser is adopted, selective laser sintering of the powder is conducted at low working temperature, and the polymer and metal composite material workpiece is prepared.The workpiece is excellent in performance and meanwhile can serve as an excellent electromagnetic shielding material due to high conductivity.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a method for low-temperature sintering of polymer composite powder materials. Background technique [0002] Selective laser sintering technology is a commonly used rapid prototyping technology at present. This technology allows only to establish a computer 3D model of the target part without using tools, and then use layering software to slice the 3D model and spread the powder on the work surface. The cylinder is then heated to a certain temperature and finally a three-dimensional solid is obtained by laser sintering multiple layers of powder. [0003] The reason why polymer powder can be melted mainly has two energy sources. One energy source is the radiation heating of the lamp tube or filament on the upper part of the working cylinder. This upper heating energy is the main energy source for powder melting, accounting for about 80%, while the other ...

Claims

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Application Information

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IPC IPC(8): B29C64/153B29C64/268B29C64/20B22F3/105B33Y10/00B33Y30/00
CPCB29C64/153B29C64/268B29C64/20B33Y10/00B33Y30/00Y02P10/25
Inventor 侯帅文杰斌李中元杨大风
Owner HUNAN FARSOON HIGH TECH CO LTD
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