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CN-118221446-B - Carbon/carbon composite material ventilation ring and preparation method and application thereof

CN118221446BCN 118221446 BCN118221446 BCN 118221446BCN-118221446-B

Abstract

The invention relates to the technical field of ventilation rings, and provides a carbon/carbon composite ventilation ring, and a preparation method and application thereof. The carbon fiber permeable ring preform is subjected to impregnation curing, carbonization and graphitization heat treatment in sequence to obtain a graphitized permeable ring blank, and the graphitized permeable ring blank is subjected to purification treatment and heat treatment after being finished to obtain the carbon/carbon composite permeable ring. The high-density high-air-permeability carbon/carbon composite material ventilation ring is prepared by combining the impregnation carbonization process and the high-temperature purification process, meets the use requirements of a photovoltaic thermal field, has higher mechanical property, longer service life and lower energy consumption, can reduce the production cost of enterprises, and meets the increasingly growing demands of photovoltaic thermal field accessories. In addition, the air-permeable ring prepared by the method has high purity, simple process, convenient operation, short preparation period and low production cost, and is suitable for large-scale industrial production.

Inventors

  • JIANG JIE
  • JIA LINTAO
  • Tan Gongfeng
  • CHI ZEMIN

Assignees

  • 上海康碳复合材料科技有限公司
  • 上海康碳创达新材料科技有限公司

Dates

Publication Date
20260505
Application Date
20240325

Claims (9)

  1. 1. The preparation method of the carbon/carbon composite material ventilation ring is characterized by comprising the following steps of: (1) Immersing the carbon fiber permeable ring preform in a resin solution and then curing to obtain a cured preform; (2) Carbonizing the solidified preform to obtain a carbon/carbon gas-permeable ring blank; (3) Carrying out graphitization heat treatment on the carbon/carbon breathable ring blank to obtain a graphitized breathable ring blank; (4) Carrying out purification treatment after finishing the graphitized breathable ring blank body to obtain a purified breathable ring, wherein the purified gas adopted in the purification treatment is Freon; (5) Performing heat treatment on the purified ventilation ring to obtain the carbon/carbon composite material ventilation ring; The impregnation pressure is 1-3 MPa, the impregnation time is 1-6 h, the curing temperature is 100-300 ℃, the curing pressure is 1-3 MPa, the curing time is 2-8 h, the carbonization temperature is 800-1200 ℃, the carbonization time is 10-48 h, the air permeability of the carbon/carbon composite air permeable ring is 5.7X10 -4 ~7.0×10 -4 cm 3 /(m 2 & d & Pa, the thermal expansion coefficient is 7.5X10 -6 ~8.5×10 -6 /K, the heat conductivity coefficient is 40-50W/mK, the compressive strength is 311-334 MPa, and the tensile strength is 172-191 MPa.
  2. 2. The preparation method of the carbon fiber breathable ring preform is characterized by comprising the steps of alternately laminating carbon fiber laid cloth and carbon fiber net tyre, needling, and performing bidirectional penetrating braiding by using Z-direction carbon fibers to obtain the carbon fiber breathable ring preform, wherein the density of the carbon fiber breathable ring preform is 0.2-0.4 g/cm 3 .
  3. 3. The method according to claim 1, wherein the graphitization heat treatment is performed in a protective atmosphere at a temperature of 1800-2300 ℃ for 1-4 hours at a temperature rising rate of 80-120 ℃ per hour.
  4. 4. The method of claim 1, wherein the graphitized gas permeable ring body has a density of 1.2g/cm 3 or more.
  5. 5. The method of claim 1, wherein the steps of impregnating, carbonizing, and graphitizing heat treating are repeated until the density of the resulting graphitized gas permeable ring body reaches above 1.2g/cm 3 when the density of the resulting gas permeable ring body after graphitizing heat treating is less than 1.2g/cm 3 .
  6. 6. The preparation method according to claim 1, wherein the number of times of the purification treatment is 1-5, the purification treatment is performed in an environment of a purified gas and a protective gas, the temperature of the purification treatment is 2000-2500 ℃, the pressure is 2-10 kPa, and the time of each purification treatment is 10-16 hours.
  7. 7. The method according to claim 1, wherein the heat treatment is performed in a protective atmosphere at a temperature of 1800-2300 ℃ for 8-12 hours and a temperature rising rate of 80-120 ℃ per hour.
  8. 8. The carbon/carbon composite permeable ring prepared by the preparation method according to any one of claims 1 to 7.
  9. 9. Use of the carbon/carbon composite permeable ring of claim 8 in a photovoltaic thermal field.

Description

Carbon/carbon composite material ventilation ring and preparation method and application thereof Technical Field The invention relates to the technical field of ventilation rings, in particular to a carbon/carbon composite ventilation ring, and a preparation method and application thereof. Background The photovoltaic thermal field is a consumable material used in the preparation process of the crystalline silicon, and comprises various components for providing a heating source for the crucible, melting the silicon material and controlling the temperature, such as a guide cylinder, a thermal insulation cylinder, a heater, the crucible and the like, which together form a thermal system so as to ensure the correct melting of the silicon material and the uniform growth of the silicon wafer. The monocrystalline silicon growth furnace is a commonly used photovoltaic thermal field, and the ventilation ring is a fitting consumable for dredging gas in the monocrystalline growth furnace. At present, a graphite ventilation ring is commonly adopted for a monocrystalline silicon growth furnace, but a graphite material is fragile, is easy to collide and deform in the transportation process, has poor high-temperature mechanical property, has short service life and frequent replacement, and greatly increases the production cost of enterprises. Disclosure of Invention In view of the above, the invention provides a carbon/carbon composite permeable ring, and a preparation method and application thereof. The carbon/carbon composite material ventilation ring for the photovoltaic thermal field is prepared by combining the steps of impregnation carbonization, high-temperature purification and the like, and the obtained carbon/carbon composite material ventilation ring has high thermal field mechanical property, difficult deformation and long service life. In order to achieve the above object, the present invention provides the following technical solutions: A preparation method of a carbon/carbon composite permeable ring comprises the following steps: (1) Immersing the carbon fiber permeable ring preform in a resin solution and then curing to obtain a cured preform; (2) Carbonizing the solidified preform to obtain a carbon/carbon gas-permeable ring blank; (3) Carrying out graphitization heat treatment on the carbon/carbon breathable ring blank to obtain a graphitized breathable ring blank; (4) Carrying out purification treatment after finishing the graphitized breathable ring blank body to obtain a purified breathable ring, wherein the purified gas adopted in the purification treatment is Freon; (5) And carrying out heat treatment on the purified ventilation ring to obtain the carbon/carbon composite material ventilation ring. The carbon fiber ventilation ring prefabricated body is of a needled structure, and the preparation method of the carbon fiber ventilation ring prefabricated body comprises the steps of alternately laminating carbon fiber laid cloth and carbon fiber net tyre, needling, and performing bidirectional penetrating braiding molding by using Z-direction carbon fibers to obtain the carbon fiber ventilation ring prefabricated body, wherein the density of the carbon fiber ventilation ring prefabricated body is 0.2-0.4 g/cm 3. Preferably, the resin liquid is phenolic resin liquid, the impregnating pressure is 1-3 MPa, the impregnating time is 1-6 h, the curing temperature is 100-300 ℃, the curing pressure is 1-3 MPa, and the curing time is 2-8 h; The carbonization temperature is 600-1200 ℃, and the carbonization time is 10-48 h. Preferably, the temperature of the graphitization heat treatment is 1800-2300 ℃, the heat preservation time is 1-4 h, the temperature rising rate from the temperature of the graphitization heat treatment to the temperature of the graphitization heat treatment is 80-120 ℃ per hour, and the graphitization heat treatment is performed in a protective atmosphere. Preferably, the density of the graphitized gas permeable ring body is 1.2g/cm 3 or more. Preferably, when the density of the resulting gas permeable ring body after the graphitization heat treatment is less than 1.2g/cm 3, the steps of impregnating, carbonizing and graphitizing heat treatment are repeated until the density of the resulting graphitized gas permeable ring body reaches above 1.2g/cm 3. Preferably, the number of times of the purification treatment is 1-5, the purification treatment is performed in the environment of purified gas and shielding gas, the temperature of the purification treatment is 2000-2500 ℃, the pressure is 2 KPa-10 KPa, and the time of each purification treatment is 10-16 h. Preferably, the temperature of the heat treatment is 1800-2300 ℃, the heat preservation time is 8-12 h, the temperature rising rate from the temperature of the heat treatment to the temperature of the heat treatment is 80-120 ℃ per hour, and the heat treatment is carried out in a protective atmosphere. The invention also provides the car