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Integral forming method of porous graphite pipe for heat exchanger

A technology of porous graphite and heat exchangers, which is applied in applications, household appliances, and other household appliances. It can solve problems such as the inability to exchange heat with high-temperature flue gas and affect the temperature resistance of porous graphite heat exchangers, and reduce fluid resistance. , improve the mechanical properties, improve the effect of heat transfer efficiency

Active Publication Date: 2022-05-13
武汉楚辰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the porous graphite heat exchangers used in industrial production are mostly prepared by molding, curing, drilling and dipping; in order to eliminate the tiny gaps formed by the pyrolysis and carbonization of organic matter, and improve the mechanical properties and sealing of heat exchangers, it is necessary The phenolic resin is impregnated and solidified in the graphite tube, but the presence of the phenolic resin will directly affect the temperature resistance of the porous graphite heat exchanger, making its temperature resistance generally below 200°C, which cannot be used for high-temperature flue gas heat exchange

Method used

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  • Integral forming method of porous graphite pipe for heat exchanger
  • Integral forming method of porous graphite pipe for heat exchanger
  • Integral forming method of porous graphite pipe for heat exchanger

Examples

Experimental program
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Embodiment 1

[0032] A method for integrally forming a porous graphite tube for a heat exchanger, comprising the steps of:

[0033] S1, 3D printing mixed powder preparation: Mix 45 parts of natural flake graphite powder, 10 parts of spherical graphite powder, 30 parts of thermosetting phenolic resin powder and 15 parts of silicon powder, and add it to a horizontal planetary ball mill, with the speed controlled below 300rpm / min , mixed for 3 hours to obtain 3D printing mixed powder; wherein, the carbon content of natural flake graphite powder is greater than 99%, and the particle size is 800 mesh; the carbon content of spherical graphite powder is greater than 99%, and the particle size is 1500 mesh; thermosetting phenolic resin powder particles The diameter is 900 mesh; the purity of silicon powder is greater than 99%, and the particle size is 200 mesh.

[0034] S2, selective laser sintering molding: take the mixed powder in step S1 and place it in a selective laser sintering molding machin...

Embodiment 2

[0041] A method for integrally forming a porous graphite tube for a heat exchanger, comprising the steps of:

[0042] S1, 3D printing mixed powder preparation: Mix 55 parts of natural flake graphite powder, 12 parts of spherical graphite powder, 25 parts of thermosetting phenolic resin powder and 25 parts of silicon powder, and add it to the horizontal planetary ball mill, with the speed controlled below 300rpm / min , mixed for 4 hours to obtain 3D printing mixed powder; wherein, the carbon content of natural flake graphite powder is greater than 99%, and the particle size is 325 mesh; the carbon content of spherical graphite powder is greater than 99%, and the particle size is 2000 mesh; thermosetting phenolic resin powder particles The diameter is 700 mesh; the purity of silicon powder is greater than 99%, and the particle size is 300 mesh.

[0043] S2, selective laser sintering molding: take the mixed powder in step S1 and place it in a selective laser sintering molding mach...

Embodiment 3

[0050] A method for integrally forming a porous graphite tube for a heat exchanger, comprising the steps of:

[0051] S1, 3D printing mixed powder preparation: Mix 35 parts of natural flake graphite powder, 5 parts of spherical graphite powder, 35 parts of thermosetting phenolic resin powder and 18 parts of silicon powder to obtain 3D printing mixed powder; among them, the natural flake graphite powder contains carbon The carbon content of spherical graphite powder is greater than 99% and the particle size is 1000 mesh; the carbon content of spherical graphite powder is greater than 99% and the particle size is 300 mesh; the particle size of thermosetting phenolic resin powder is 500 mesh; the purity of silicon powder is greater than 99% and the particle size is 500 mesh .

[0052] S2, selective laser sintering molding: take the mixed powder in step S1 and place it in a selective laser sintering molding machine, use the powder spreading roller to spread it flat, and quickly pr...

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Abstract

The invention provides an integral forming method of a porous graphite pipe for a heat exchanger. The integral forming method comprises the steps of 3D printing mixed powder preparation, selective laser sintering forming, curing, carbonization, multiple times of vacuum impregnation and high-temperature siliconizing. According to the preparation method, multiple times of vacuum pressure impregnation treatment are adopted, phenolic resin impregnation of a macromolecular chain is firstly performed, then epoxy resin impregnation of a micromolecular chain is performed, internal densification is promoted, then high-temperature siliconizing treatment is performed, thermosetting phenolic resin and epoxy resin residues are subjected to an in-situ sintering reaction with liquid silicon, and the high-temperature siliconizing effect is achieved. 2% volume expansion is accompanied while silicon carbide is generated on the surface layer, so that the surface layer of the porous graphite pipe is more compact, the temperature resistance of the surface layer of the porous graphite pipe is improved, and meanwhile, the mechanical property and the oxidation resistance of the porous graphite pipe are improved.

Description

technical field [0001] The invention relates to the technical field of graphite heat exchangers, in particular to an integral molding method of porous graphite tubes for heat exchangers. Background technique [0002] Porous graphite heat exchangers are mostly used in optoelectronics, integrated circuits, LED, and glass product manufacturing industries. They use the high-temperature flue gas generated by glass melting furnaces to preheat air or use cooling media to quickly transfer heat. [0003] At present, the porous graphite heat exchangers used in industrial production are mostly prepared by molding, curing, drilling and dipping; in order to eliminate the tiny gaps formed by the pyrolysis and carbonization of organic matter, and improve the mechanical properties and sealing of heat exchangers, it is necessary The phenolic resin is impregnated and solidified in the graphite tube, but the presence of the phenolic resin will directly affect the temperature resistance of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/52C04B35/622C04B35/64B33Y70/10B33Y10/00
CPCC04B38/067C04B35/522C04B35/622C04B35/64B33Y70/10B33Y10/00C04B2235/428C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/661C04B2235/6026C04B2235/77C04B2235/96C04B2235/9607C04B38/0067
Inventor 王雪岩陈虹吴海华
Owner 武汉楚辰新材料科技有限公司