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CN-121990837-A - High-temperature fireproof heat-insulating carbon fiber composite material and preparation method thereof

CN121990837ACN 121990837 ACN121990837 ACN 121990837ACN-121990837-A

Abstract

The invention discloses a high-temperature refractory heat-insulating carbon fiber composite material which comprises, by weight, 35-50 parts of wollastonite-feldspar composite powder, 25-35 parts of modified porous mullite aggregate, 12-20 parts of calcium aluminate cement, 2-8 parts of modified chopped carbon fiber, 1.5-2.5 parts of sodium dodecyl benzene sulfonate and 1-2 parts of sodium tripolyphosphate. The preparation method comprises the steps of S1, weighing wollastonite-feldspar composite powder, modified porous mullite aggregate, calcium aluminate cement and modified chopped carbon fibers according to a proportion, dry mixing, S2, adding water into sodium dodecyl benzene sulfonate and sodium tripolyphosphate, stirring to obtain an auxiliary agent aqueous solution, S3, adding the auxiliary agent aqueous solution into a dry powder mixture, stirring, S4, transferring the slurry into a mould, carrying out hydraulic molding, S5, maintaining a molded blank, demoulding, drying, sintering at a high temperature, and cooling to obtain the high-temperature refractory heat-insulating carbon fiber composite material. The refractory and heat-insulating carbon fiber composite material produced by the invention can improve high temperature resistance and compressive strength.

Inventors

  • YU HONGFENG

Assignees

  • 西安柯美工业机械装备科技有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (8)

  1. 1. The high-temperature refractory heat-insulating carbon fiber composite material is characterized by comprising, by weight, 35-50 parts of wollastonite-feldspar composite powder, 25-35 parts of modified porous mullite aggregate, 12-20 parts of calcium aluminate cement, 2-8 parts of modified chopped carbon fiber, 1.5-2.5 parts of sodium dodecyl benzene sulfonate and 1-2 parts of sodium tripolyphosphate.
  2. 2. The high-temperature refractory and heat-insulating carbon fiber composite material according to claim 1 is characterized in that wollastonite-feldspar composite powder is prepared by (1) placing wollastonite and potassium feldspar in a planetary ball mill according to a mass ratio of 1:0.6-0.8, ball milling for 4-6 hours at a rotating speed of 250-350 r/min, sieving with a 200-mesh sieve to obtain mixed powder, and (2) placing the mixed powder in a box-type resistance furnace, heating for 2-3 hours at 900-950 ℃, and cooling to obtain the wollastonite-feldspar composite powder.
  3. 3. The high-temperature refractory heat-insulating carbon fiber composite material according to claim 1, wherein the modified porous mullite aggregate is prepared by the following steps of immersing a porous mullite aggregate raw material with the Al 2 O 3 content of more than or equal to 75% and the particle size of 50-200 μm in a silica sol solution with the concentration of 5-10%, stirring for 30-50 minutes, taking out, placing into an electric heating constant-temperature drying oven, and drying for 2-3 hours at the temperature of 75-85 ℃ to obtain the modified porous mullite aggregate.
  4. 4. The high-temperature refractory and heat-insulating carbon fiber composite material according to claim 1, wherein the calcium aluminate cement is CA-50 industrial grade calcium aluminate cement, and the content of Al 2 O 3 is more than or equal to 50%.
  5. 5. The high-temperature refractory and heat-insulating carbon fiber composite material according to claim 1 is characterized in that the modified chopped carbon fiber is prepared by (1) placing chopped carbon fiber into a muffle furnace, burning for 20-30 minutes at 400-450 ℃ and cooling to obtain oxidized chopped carbon fiber, (2) placing the oxidized chopped carbon fiber into a high-speed mixer, adding a silane coupling agent KH-560 into the high-speed mixer according to the mass ratio of the oxidized chopped carbon fiber to the silane coupling agent KH-560 of 50-70:1, setting the rotating speed of the high-speed mixer to 1300-1500 r/min, and dry-mixing for 6-10 min to obtain the modified chopped carbon fiber.
  6. 6. The high-temperature refractory and heat-insulating carbon fiber composite material according to claim 1, wherein the sodium dodecyl benzene sulfonate is pretreated by putting the sodium dodecyl benzene sulfonate into an electric heating constant temperature drying oven, drying for 1-2 hours at 60-80 ℃, cooling to room temperature after drying, sieving with a 200-mesh sieve, and transferring the sieved sodium dodecyl benzene sulfonate into a brown sealed bottle for later use.
  7. 7. The high-temperature refractory and heat-insulating carbon fiber composite material according to claim 1, wherein the sodium tripolyphosphate is industrial grade sodium tripolyphosphate, the purity is more than or equal to 98%, and the water solubility at normal temperature is more than or equal to 95g/100mL.
  8. 8. The preparation method of the high-temperature refractory heat-insulating carbon fiber composite material comprises the following steps: S1, weighing wollastonite-feldspar composite powder, modified porous mullite aggregate, calcium aluminate cement and modified chopped carbon fiber according to a proportion, placing the wollastonite-feldspar composite powder, the modified porous mullite aggregate, the calcium aluminate cement and the modified chopped carbon fiber into a high-speed mixer, setting the rotating speed to be 800-1000 r/min, and dry-mixing for 8-12 minutes to obtain a dry powder mixture; S2, weighing deionized water according to the mass ratio of the dry powder mixture to water of 20:5-7, putting the deionized water into a stirring tank, adding sodium dodecyl benzene sulfonate and sodium tripolyphosphate into the deionized water according to a proportion, setting the rotating speed of the stirring tank to be 500-600 r/min, and stirring for 15-20 minutes to obtain an auxiliary agent aqueous solution; S3, adjusting the rotating speed of the high-speed mixer to be 400-500 r/min, slowly dripping the aqueous solution of the auxiliary agent into the dry powder mixture through a feed inlet, wherein the dripping speed is 5-10L/h, and continuously stirring for 20-30 minutes after the dripping is completed to obtain slurry; s4, rapidly transferring the slurry into a custom mold, scraping the surface of the slurry by a scraper, conveying the scraped mold into a hydraulic forming machine, applying 15-25 MPa pressure, and maintaining the pressure for 3-5 minutes to obtain a formed blank; S5, placing the molded blank body and a die into a constant temperature and constant humidity curing box, setting the curing temperature to be 20-28 ℃ and the relative humidity to be 70-80%, curing for 20-40 hours, then placing into a hydraulic demolding machine for demolding, placing into an electric heating constant temperature drying box for drying after demolding, slowly heating to 110 ℃ at the heating rate of 5 ℃ per hour, preserving heat for 3-5 hours at 110 ℃, placing into a high temperature sintering furnace after drying, heating to 1100-1200 ℃ at the heating rate of 3-5 ℃ per minute under nitrogen atmosphere, sintering at the temperature for 2-4 hours, cooling to room temperature after sintering, and taking out to obtain the finished high temperature refractory and heat insulating carbon fiber composite material.

Description

High-temperature fireproof heat-insulating carbon fiber composite material and preparation method thereof Technical Field The invention relates to the technical field of refractory materials, in particular to a high-temperature refractory heat-insulating carbon fiber composite material and a preparation method thereof. Background The high-temperature refractory heat-insulating material is an indispensable key basic material in the fields of industrial production, building kiln, metallurgical chemical industry and the like, and the performance of the high-temperature refractory heat-insulating material directly influences the operation efficiency, the service life and the safety of high-temperature equipment. Along with the continuous upgrading of industrial technology, the requirements of high-temperature working conditions on the refractory heat insulation materials are more severe, and the refractory heat insulation materials are required to have excellent high-temperature resistance, good heat insulation performance, mechanical strength, thermal shock resistance and the like, so that the refractory heat insulation materials are suitable for complex working conditions of repeated cold and hot alternation. At present, the high-temperature refractory and heat-insulating materials on the market are various in variety and mainly comprise traditional refractory bricks, ceramic fiber materials, light refractory castable materials, carbon fiber reinforced composite materials and the like. The traditional refractory brick has the advantages of good high temperature resistance, high volume, poor heat insulation, insufficient thermal shock resistance and the like, is easy to crack and damage in a cold-hot cycle, has excellent heat insulation performance, low mechanical strength, easy pulverization and failure in a high-temperature environment for a long time and short service life, and has certain fire resistance and heat insulation performance, low green body strength after molding, easy shrinkage deformation in a sintering process and influences the construction quality and the use stability. The carbon fiber refractory composite material has the characteristics of high strength, thermal shock resistance, corrosion resistance and the like, and can effectively improve the mechanical property and the crack resistance of the refractory material, however, the carbon fiber has lower surface activity and weaker interfacial binding force with a matrix material, so that the application effect of the carbon fiber refractory composite material in the composite material is limited to a certain extent. Therefore, the application provides a high-temperature refractory heat-insulating carbon fiber composite material and a preparation method thereof, which are used for solving the problems of weak compressive strength, insufficient high-temperature resistance of lightweight aggregate and the like of the combination of carbon fibers and a refractory matrix, enhancing the high-temperature resistance and improving the compressive strength. Disclosure of Invention The invention aims to provide a high-temperature refractory heat-insulating carbon fiber composite material and a preparation method thereof, which are used for solving the problems of weak compressive strength, insufficient high-temperature resistance of lightweight aggregate and the like of the combination of carbon fibers and a refractory matrix, enhancing the high-temperature resistance and improving the compressive strength. The invention provides a high-temperature fireproof heat-insulating carbon fiber composite material which comprises, by weight, 35-50 parts of wollastonite-feldspar composite powder, 25-35 parts of modified porous mullite aggregate, 12-20 parts of calcium aluminate cement, 2-8 parts of modified chopped carbon fibers, 1.5-2.5 parts of sodium dodecyl benzene sulfonate and 1-2 parts of sodium tripolyphosphate. According to the preferable technical scheme, the wollastonite-feldspar composite powder is prepared by the following steps of (1) placing wollastonite and potassium feldspar into a planetary ball mill according to the mass ratio of 1:0.6-0.8, ball milling for 4-6 hours at the rotating speed of 250-350 r/min, sieving with a 200-mesh sieve to obtain mixed powder, and (2) placing the mixed powder into a box-type resistance furnace, heating for 2-3 hours at 900-950 ℃, and cooling to obtain the wollastonite-feldspar composite powder. According to the preferred technical scheme, the modified porous mullite aggregate is prepared by the following steps of immersing a porous mullite aggregate raw material with the Al 2O3 content of more than or equal to 75% and the grain diameter of 50-200 mu m in a silica sol solution with the concentration of 5-10%, stirring for 30-50 minutes, taking out, placing in an electric heating constant-temperature drying oven, and drying for 2-3 hours at the temperature of 75-85 ℃ to obtain the modified porous mullite aggre