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Method for preparing carbon/carbon composite materials through 3D printing

A carbon composite material and 3D printing technology, which is applied in the direction of additive processing, etc., can solve the problems of mechanical properties that need to be improved, the preparation process of abrasive tools is complicated, and it is not suitable for 3D printing, so as to save mold processing steps and improve mechanical properties. performance, ensuring consistent results

Inactive Publication Date: 2015-12-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing relatively mature preparation methods of this material mainly include 1. Long fiber preform weaving, and this method has been relatively mature in actual production and application, but this method has the disadvantages of complicated preparation process and difficulty in preparing complex parts
2. Compression molding, this method is only suitable for mass production of parts and has the disadvantage of complex preparation process of abrasive tools
[0004] However, the combination of carbon fiber and pyrolytic carbon in the existing technology is a mechanical combination that is not suitable for 3D printing, and the mechanical properties of 3D printing composite materials have problems that need to be improved.

Method used

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  • Method for preparing carbon/carbon composite materials through 3D printing
  • Method for preparing carbon/carbon composite materials through 3D printing
  • Method for preparing carbon/carbon composite materials through 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Accurately weigh each component according to the following data: carbon fiber, 2kg, with an average diameter of 7μm, and a length range of 201μm-300μm; phenolic resin powder, 3kg, with a particle size range of 50μm-150μm; fumed silica, 10g ; Hexamethylenetetramine, 300g;

[0037](2) Disperse the carbon fibers in a nitric acid solution (67%) at 50°C for 3 hours with an ultrasonic stirrer. During this process, the surface of the carbon fibers was etched by nitric acid; the sample was dried in a vacuum filter drier at 140°C for 24 hours to finally obtain The carbon fiber after nitric acid etching, the etched carbon fiber and acetone are mixed in an ultrasonic stirrer with a mass ratio of 1:1 for 1 h;

[0038] (3) The phenolic resin powder is fully mixed with hexamethylenetetramine in a V-shaped mixer at a mass ratio of 10:1 for 2 hours;

[0039] (4) The liquid mixture and the powder mixture obtained in (2) and (3) are added into a 10L reaction vessel at the same time,...

Embodiment 2

[0043] (1) Accurately weigh each component according to the following data: carbon fiber 2Kg, with an average diameter of 7 μm, and a length range of 201 μm-300 μm; phenolic resin powder, 2 Kg, with a particle size range of 50 μm-150 μm; fumed silica, 10 g; Hexamethylenetetramine, 200g;

[0044] (2) Disperse the carbon fibers in a nitric acid solution (67%) at 50°C for 3 hours with an ultrasonic stirrer. During this process, the surface of the carbon fibers was etched by nitric acid; the sample was dried in a vacuum filter drier at 140°C for 24 hours to finally obtain The carbon fiber after nitric acid etching, the etched carbon fiber and acetone are mixed in an ultrasonic stirrer with a mass ratio of 1:1 for 1 h;

[0045] (3) The phenolic resin powder is fully mixed with hexamethylenetetramine in a V-shaped mixer at a mass ratio of 10:1 for 2 hours;

[0046] (4) The liquid mixture and the powder mixture obtained in (2) and (3) are added into a 10L reaction vessel at the same...

Embodiment 3

[0050] (1) Accurately weigh each component according to the following data: carbon fiber 3Kg, with an average diameter of 7 μm, and a length range of 201 μm-300 μm; phenolic resin powder, 2 Kg, with a particle size range of 50 μm-150 μm; fumed silica, 10 g; Hexamethylenetetramine, 200g;

[0051] (2) Disperse the carbon fibers in a nitric acid solution (67%) at 50°C for 3 hours with an ultrasonic stirrer. During this process, the surface of the carbon fibers was etched by nitric acid; the sample was dried in a vacuum filter drier at 140°C for 24 hours to finally obtain The carbon fiber after nitric acid etching, the etched carbon fiber and acetone are mixed in an ultrasonic stirrer with a mass ratio of 1:1 for 1 h;

[0052] (3) The phenolic resin powder is fully mixed with hexamethylenetetramine in a V-shaped mixer at a mass ratio of 10:1 for 2 hours;

[0053] (4) Add the liquid mixture and powder mixture obtained in (2) and (3) into a 10L reaction vessel at the same time, the...

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Abstract

The invention relates to a method for preparing carbon / carbon composite materials through 3D printing. The method comprises the steps that after being etched with an etching solution, carbon fibers are mixed with a solvent used for dissolving thermosetting resin to obtain a solid and liquid mixture; the thermosetting resin and a curing agent are fully mixed to obtain a solid mixture; the solid and liquid mixture and the solid mixture are added in a reaction vessel, and after the solid mixture is stirred and dissolved, a mixture block obtained by drying the mixtures in the reaction vessel is crushed; prepared raw materials are poured in a 3D printer powder feeding cylinder for carbon / carbon composite material green body 3D printing; and an obtained carbon / carbon composite material green body is put in a heat treatment furnace to be cured, carbonized and densified to obtain the carbon / carbon composite materials. The carbon / carbon composite materials prepared through the method have the excellent mechanical performance and technological forming performance, and application of the carbon / carbon composite materials is widened to the field of more precise and complex structures.

Description

technical field [0001] The invention relates to a method for preparing a carbon / carbon composite material based on 3D printing technology. Background technique [0002] Carbon / carbon composite material is a composite material of carbon fiber and its carbon matrix, which has low density (<2.0g / cm3), high strength, high specific modulus, high thermal conductivity, low expansion coefficient, good friction performance, and thermal shock resistance The advantages of good temperature and high dimensional stability are the few candidate materials used above 1650 °C, and the maximum theoretical temperature is as high as 3000 °C, so it is considered to be one of the most promising high-temperature materials. The existing relatively mature preparation methods of this material mainly include 1. Long fiber preform weaving, and this method has been relatively mature in actual production and application, but this method has the disadvantages of complicated preparation process and diffi...

Claims

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Application Information

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IPC IPC(8): B29C67/00B33Y70/00B33Y10/00C04B35/83C04B35/622
Inventor 廖寄乔易旭李军谭周建李丙菊
Owner CENT SOUTH UNIV
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