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A selective laser sintering molding method for a heat-conducting functional material

A functional material and selective technology, which is applied in the field of selective laser sintering of thermally conductive functional materials, can solve the problems of complex process, damage to the original shape, high cost, etc., and achieve the effect of simple process and low equipment requirements

Inactive Publication Date: 2015-07-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the former can improve the density of the part to a certain extent, the combination between the infiltrated resin and the part is not good. Although the latter can make the part more dense, it will destroy the original shape between them, and the process is complicated and costly.

Method used

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  • A selective laser sintering molding method for a heat-conducting functional material
  • A selective laser sintering molding method for a heat-conducting functional material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Disperse 100g KH550 (γ-aminopropyltriethylsilane) in a mixed solution of 5000mL ethanol and water with a mass ratio of 1:1, and then add 20kgAl 2 o 3 The powder (particle size is 3 μm), after being fully stirred, placed in a constant temperature drying oven, first dried at 70 ° C for 2 h, and then dried at 110 ° C for 6 h to obtain the coupled Al 2 o 3 Powder;

[0030] (2) Dry the nylon 12 (PA12) pellets at 80°C, then weigh 16kg of the coupled Al 2 o 3Put the powder and 4kg of dried nylon 12 granules in a mixer, stir for 10 minutes at 1000rpm, and then put them in a twin-screw extruder at 220°C and 240rpm to extrude twice for granulation. Obtain composite pellets;

[0031] (3) The composite granular material prepared according to step (2) is pulverized under the condition of liquid nitrogen cooling, after pulverization, crosses a 120 mesh sieve, and the material on the sieve is pulverized again, and the fine powder under the sieve is a composite thermally condu...

Embodiment 2

[0035] The method is the same as in Example 1, except that in step (5), the heat treatment temperature is 150° C., and it is incubated for 1 hour; the density after the heat treatment is tested with the Archimedes method density balance, and the density change before and after the heat treatment is compared, and the heat treatment is calculated. The density change rate of the sample under temperature and time, the specific data are shown in Table 1.

Embodiment 3

[0037] The method is the same as in Example 1, the difference is that in step (5), the heat treatment temperature is 180°C, and the heat preservation is carried out for 1h; the density after the heat treatment is tested with the Archimedes method density balance, and the density change before and after the heat treatment is compared, and the heat treatment is calculated. The density change rate of the sample under temperature and time, the specific data are shown in Table 1.

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Abstract

A selective laser sintering molding method for a heat-conducting functional material is disclosed. The method includes dispersing a coupling agent in an alcohol-water mixed liquid, adding heat-conducting filler powder, fully stirring, drying by a thermostatic drying oven to obtain a coupled heat-conducting filler, mixing the coupled heat-conducting filler with a polymer matrix in a stirring machine, stirring, mixing in a twin-screw extruder at 200-250 DEG C, extruding, granulating, smashing the obtained composite particle material under a liquid nitrogen cooling condition, molding under protection of nitrogen in a selective laser sintering molding machine, and subjecting the obtained molded part to thermal processing to obtain the heat-conducting functional material. The method can prepare SLS molded products with high performance and structured appearance by adopting a process combining mixing, extrusion, low-temperature smashing and thermal processing, and is simple and feasible in process and low in equipment requirement.

Description

(1) Technical field [0001] The invention belongs to the technical field of rapid prototyping, and in particular relates to a selective laser sintering forming method of a heat-conducting functional material. The method includes the preparation and molding of the heat-conducting functional material and the post-treatment process of the workpiece. (2) Technical background [0002] 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 sliced ​​by the program In the powder bed of the forming machine, the three-dimensional solid is formed by selective sintering layer by layer. Comprehensive use of computer science and engineering, mechanical manufacturing automation and control engineering, laser engineering and material science engineering and other disciplines is an additive manufacturing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/04
Inventor 乔梁唐城城车声雷郑精武应耀李旺昌姜力强
Owner ZHEJIANG UNIV OF TECH
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