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Three-layer structure heat conduction powder for SLS and preparation and use method thereof

A thermally conductive powder, three-layer structure technology, applied in manufacturing, solid material additive processing, additive processing, etc., can solve the problems of low precision, easy bending deformation, etc., to achieve full contact, smooth powder spreading, Solve the effect of uneven heating

Pending Publication Date: 2021-04-20
OECHSLER PLASTIC PROD TAICANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of its high automation, digitalization, high precision and other characteristics, but the powder, especially the mixed powder absorbs the energy of the laser, heats up and melts and then solidifies, the precision is not high, and it is easy to bend and deform

Method used

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  • Three-layer structure heat conduction powder for SLS and preparation and use method thereof
  • Three-layer structure heat conduction powder for SLS and preparation and use method thereof
  • Three-layer structure heat conduction powder for SLS and preparation and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A heat-conducting powder with a three-layer structure that can be used in SLS and its preparation and use methods.

[0020] (1) The spherical heat-conducting core material powder (BN, diameter 10 μm) is uniformly dispersed in the mixed solution of water and ethanol.

[0021] (2) Add tetraethyl orthosilicate and γ-aminopropyltriethoxysilane (mass ratio 1:1) to it and stir evenly, then add catalyst (ammonia) and stir thoroughly to prepare a compound with amino graft Layered double-layer structure spherical powder.

[0022] (3) The obtained double-layer structure spherical powder with amino graft layer is filtered and dried; the obtained double-layer structure spherical powder with amino graft layer is added to the reaction kettle, and then dropped into 1,12-deca Dialkyldiamine, terephthalic acid, benzoic acid as an end-capping agent, sodium hypophosphite catalyst and deionized water (mass ratio 1:10:10:0.5:0.1:100).

[0023] (4) Vacuumize for 15 minutes, then raise the ...

Embodiment 2

[0027] A heat-conducting powder with a three-layer structure that can be used in SLS and its preparation and use methods.

[0028] (1) Spherical thermally conductive core material powder (Al 2 o 3 , diameter 20 μm) uniformly dispersed in the mixed solution of water and ethanol.

[0029] (2) Add tetraethyl orthosilicate and γ-aminopropyltriethoxysilane (mass ratio 2:1) to it and stir evenly, then add catalyst (acetic acid) and stir thoroughly to prepare a compound with amino graft Layered double-layer structure spherical powder.

[0030] (3) The obtained double-layer structure spherical powder with amino graft layer is filtered and dried; the obtained double-layer structure spherical powder with amino graft layer is added to the reaction kettle, and then dropped into 1,12-deca Dialkyldiamine, terephthalic acid, benzoic acid as an end-capping agent, sodium hypophosphite catalyst and deionized water (mass ratio 1:10:10:0.5:0.1:100).

[0031] (4) Vacuumize for 25 minutes, then...

Embodiment 3

[0035] A heat-conducting powder with a three-layer structure that can be used in SLS and its preparation and use methods.

[0036] (1) The spherical heat-conducting core material powder (SiC, diameter 30 μm) is uniformly dispersed in the mixed solution of water and ethanol.

[0037] (2) Add tetraethyl orthosilicate and γ-aminopropyl triethoxysilane (mass ratio 4:1) to it and stir evenly, then add catalyst (hydrochloric acid) and stir thoroughly to prepare a compound with amino graft Layered double-layer structure spherical powder.

[0038] (3) The obtained double-layer structure spherical powder with amino graft layer is filtered and dried; the obtained double-layer structure spherical powder with amino graft layer is added to the reaction kettle, and then dropped into 1,12-deca Dialkyldiamine, terephthalic acid, benzoic acid as an end-capping agent, sodium hypophosphite catalyst and deionized water (mass ratio 1:10:10:0.5:0.1:100).

[0039] (4) Vacuumize for 35 minutes, the...

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Abstract

The invention belongs to the field of heat conduction materials, and particularly relates to a three-layer structure heat conduction powder for SLS and a preparation and use method thereof. According to the invention, enough amino sites are prepared in a manner of firstly preparing a grafting layer on a spherical heat-conducting powder material, and then a PA12 layer is prepared at the periphery of the grafting layer in a polymerization manner, so that the powder with a three-layer structure is obtained, as shown in Figure 1. The powder can be used for preparing a heat conduction structural part rough blank through SLS printing, and then the heat conduction structural part is prepared in a sintering mode. The problem that conventional mixed powder cannot be completely and uniformly mixed is solved, the problem that buckling deformation is easily caused by uneven heating, too fast cooling and the like when a heat conducting sheet is prepared from conventional heat conducting powder SLS is also solved, and meanwhile the beneficial effects of being smooth in powder laying, sufficient in contact, convenient in SLS printing and the like are further achieved. And the prepared heat conduction part has outstanding heat conduction performance and excellent mechanical performance.

Description

technical field [0001] The invention belongs to the field of heat-conducting materials, and in particular relates to a heat-conducting powder with a three-layer structure that can be used in SLS and a preparation and use method. Background technique [0002] With the development of industrial production and science and technology, people continue to put forward new requirements for materials. In the field of electronic appliances, due to the rapid development of integration technology and assembly technology, electronic components and logic circuits are becoming lighter, thinner, and smaller, and the heat generation is also increasing. The heat, which is related to the service life and quality reliability of the product. [0003] Selected Laser Sintering (SLS) molding is an advanced manufacturing technology, based on the discrete / stacking principle, the target molding model is obtained through CAD / Pro-E and other design software or 3D solid scanning, and the 3D model is sli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26C08G69/28C08K9/04C08K9/06C08K7/18B29C64/153B33Y10/00B33Y80/00
Inventor 吴玲赵正柏杜湘云张华建
Owner OECHSLER PLASTIC PROD TAICANG
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