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Preparation method of hard thermal-insulation carbon felt

A carbon felt and hard technology, which is applied in the field of preparation of hard thermal insulation carbon felt, can solve the problems of short service life, unstable thermal field, low operating temperature, etc., to prevent radiation heat transfer, low density and low thermal conductivity. Effect

Active Publication Date: 2014-08-13
XIAN KANGBEN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a large number of traditional felt insulation materials are still used in various holding furnaces in my country, but traditional felts have defects such as low operating temperature, heavy pollution, high temperature brittleness, short service life, and unstable thermal field.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment adopts 8 pieces of soft carbon felts with a thickness of 10mm, the soft carbon felts have a square cross-section and a size of 1m×1m, two graphite papers of 1m×1m, and two polyester films of 1.1m×1.1m to prepare Methods as below:

[0027] Step 1, mix hexamethylenetetramine with absolute ethanol and stir until hexamethylenetetramine is dissolved, then mix the dissolved hexamethylenetetramine with phenolic resin and stir evenly to obtain glue, glue The weight of liquid is 1.7 times of soft carbon felt gross weight; The mass ratio of described phenolic resin, dehydrated alcohol and hexamethylenetetramine is 100:15:6;

[0028] Step 2, laying the polyester film flat on the working platform, and then laying the graphite paper on the polyester film;

[0029] Step 3, lay 8 pieces of soft carbon felt layer by layer above the graphite paper described in step 2; the method of laying is: first brush the glue solution described in step 1 on one side of the soft carb...

Embodiment 2

[0035] In this embodiment, five soft carbon felts with a thickness of 12mm are used. Ester film, preparation method is as follows:

[0036] Step 1, mix hexamethylenetetramine with acetone and stir until hexamethylenetetramine is dissolved, then mix the dissolved hexamethylenetetramine with phenolic resin and stir evenly to obtain glue, the glue Weight is 1.5 times of soft carbon felt gross weight; The mass ratio of described phenolic resin, acetone and hexamethylenetetramine is 100:8:3;

[0037]Step 2, laying the polyester film flat on the working platform, and then laying the graphite paper on the polyester film;

[0038] Step 3. Lay 5 pieces of soft carbon felt layer by layer above the graphite paper described in step 2; the method of laying is: first brush the glue solution described in step 1 on one side of the soft carbon felt, and then make the soft carbon felt Lay the side coated with glue downwards, and then brush the glue described in step 1 on the other side of the...

Embodiment 3

[0044] In this embodiment, 10 soft carbon felts with a thickness of 8mm are used. The soft carbon felts have a square cross-section and a size of 1m×1m, two graphite papers of 1m×1m, and two polyester films of 1.2m×1.2m. Methods as below:

[0045] Step 1, mix hexamethylenetetramine with acetone and stir until hexamethylenetetramine is dissolved, then mix the dissolved hexamethylenetetramine with phenolic resin and stir evenly to obtain glue, the glue Weight is 1 times of soft carbon felt gross weight; The mass ratio of described phenolic resin, acetone and hexamethylenetetramine is 100:8:6;

[0046] Step 2, laying the polyester film flat on the working platform, and then laying the graphite paper on the polyester film;

[0047] Step 3, lay 10 pieces of soft carbon felt layer by layer above the graphite paper described in step 2; the method of laying is: first brush the glue solution described in step 1 on one side of the soft carbon felt, and then make the soft carbon felt L...

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Abstract

The invention discloses a preparation method of a hard thermal-insulation carbon felt, which comprises the following steps: 1. preparing a colloidal liquid; 2. spreading a polyester film on a working platform, and laying graphite paper on the polyester film; 3. laying a plurality of soft carbon felts on the graphite paper layer by layer; 4. laying graphite paper and a polyester film on the uppermost soft carbon felt to obtain an assembly; 5. putting the assembly in a hot press, and carrying out hot press curing; and 6. removing the polyester films from the assembly, putting in a carbonization furnace, and carbonizing in a nitrogen protective atmosphere to obtain the hard thermal-insulation carbon felt. By introducing the resin into the common soft carbon felt, bonding the soft carbon felts together by layer-by-layer laying and performing hot press curing and carbonization, the prepared hard thermal-insulation carbon felt has the advantages of low density, small heat conductivity coefficient, high carbon content, low thermal capacity, low linear expansibility, high temperature resistance, high thermal shock resistance, high chemical corrosion resistance, energy saving and the like, and can substitute the traditional thermal-insulation furnace heat-insulating material.

Description

technical field [0001] The invention belongs to the technical field of heat insulation materials for heat preservation furnaces, and in particular relates to a preparation method of a hard heat insulation carbon felt. Background technique [0002] Holding furnaces (high and low temperature carbonization furnaces, CVD furnaces, CVI furnaces, etc.) are widely used in chemical, energy, aerospace and other fields, and the heat insulation layer plays a vital role in holding furnaces. At present, a variety of holding furnaces in my country still use traditional felt insulation materials in large quantities, but traditional felts have defects such as low operating temperature, heavy pollution, high temperature brittleness, short service life, and unstable thermal field. In order to overcome the above defects, it is necessary to find new insulation materials. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for ...

Claims

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Application Information

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IPC IPC(8): C04B35/83
Inventor 赵景飞刘建军王希杰张勇岳鸿飞于晓丽赵华民
Owner XIAN KANGBEN MATERIAL
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