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CN-121974669-A - Honeycomb ceramic with high heat storage performance and preparation method thereof

CN121974669ACN 121974669 ACN121974669 ACN 121974669ACN-121974669-A

Abstract

The invention relates to the technical field of honeycomb ceramics, in particular to a honeycomb ceramic with high heat storage performance and a preparation method thereof, and the honeycomb ceramic comprises the following raw materials, by weight, 60-80 parts of cordierite, 20-30 parts of silicon carbide, 15-20 parts of fillers, 5-10 parts of additives, 5-10 parts of zirconia, 5-10 parts of fayalite, 1-3 parts of methylcellulose, 3-5 parts of binders and 3-5 parts of graphite powder. According to the invention, the filler takes the aluminum silicon oxide fiber prepared by the electrostatic spinning technology as a three-dimensional framework, has good thermal expansion coefficient matching property with a cordierite matrix, realizes strong interface bonding through a KH550 treating agent, effectively inhibits microcrack expansion caused by thermal mismatch between high-heat-conductivity components such as silicon carbide and the matrix, and further improves heat storage density of the additive composed of sodium nitrate, potassium nitrate and expandable graphite in the filler through phase change latent heat and a heat conduction passage, thereby guaranteeing long-term heat storage performance and service life of the additive.

Inventors

  • ZHANG YUECHAN
  • LIU ZIKANG
  • Wu Dengxian

Assignees

  • 福建俊杰新材料科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260205

Claims (10)

  1. 1. The honeycomb ceramic with high heat storage performance is characterized by comprising, by weight, 60-80 parts of cordierite, 20-30 parts of silicon carbide, 15-20 parts of filler, 5-10 parts of additives, 5-10 parts of zirconia, 5-10 parts of fayalite, 1-3 parts of methylcellulose, 3-5 parts of binders and 3-5 parts of graphite powder; The raw materials of the additive comprise magnesium oxide, titanium diboride, yttrium oxide and absolute ethyl alcohol.
  2. 2. The honeycomb ceramic with high heat accumulation performance according to claim 1, wherein the filler is prepared by mixing aluminum isopropoxide with absolute ethyl alcohol, adding deionized water and nitric acid, refluxing and stirring in a water bath at 75-80 ℃ for 2-2.5 hours to obtain a first mixture, mixing tetraethoxysilane with absolute ethyl alcohol, adding deionized water and nitric acid, stirring at room temperature for 1-1.5 hours to obtain a second mixture, dripping the second mixture into the first mixture, stirring for 3-4 hours at 55-65 ℃ to obtain a preparation, mixing the preparation and PVP in a water bath at 50-55 ℃, adding an additive, setting 300-500W ultrasonic dispersion treatment for 20-30 minutes to obtain a mixed solution, injecting the mixed solution into an electrostatic spinning device, setting an injection speed to 0.4-0.6 ml/h, a voltage to 15-20 kV, receiving a distance to 10-20 cm, obtaining a fiber material, feeding the fiber material into a muffle furnace, setting a heating rate to 1-5.5 ℃ to 3-5 hours, heating the fiber material to 3-1200 hours, setting a heating rate to 3-5 hours, drying the fiber material, and taking out the fiber material after heating to 3-80 ℃ for 3-5 hours, carrying out heat preservation treatment, heating to obtain a short fiber material, and carrying out heat preservation treatment at 3-80 hours.
  3. 3. The honeycomb ceramic with high heat storage performance according to claim 2, wherein the mass ratio of aluminum isopropoxide to absolute ethyl alcohol to deionized water to nitric acid is 1:4-5:0.2-0.3:0.08-0.1, the mass ratio of ethyl orthosilicate to absolute ethyl alcohol to deionized water to nitric acid is 1:3.5-4:0.2-0.3:0.08-0.1, the mass ratio of the first mixture to the second mixture is 1:0.8-0.9, the mass ratio of the preparation material to PVP is 1:0.1-0.15, the mass ratio of the additive is 15-20% of the mass of the preparation material, and the treating agent is prepared by mixing KH550, ethanol and water according to the mass ratio of 1:70-80:10-15.
  4. 4. The honeycomb ceramic with high heat storage performance according to claim 2, wherein the additive is prepared by mixing sodium nitrate and potassium nitrate according to a mass ratio of 1:1, sending the mixture into a muffle furnace, maintaining the temperature at 250-300 ℃ for 40-60 min, cooling the obtained product, crushing and grinding the cooled product, sieving the cooled product by 100 meshes to obtain fine powder, mixing the fine powder with pretreated expandable graphite, sending the mixture into a vacuum drying oven at the temperature of 250 ℃, maintaining the temperature for 30min, crushing and grinding the cooled product, and sieving the cooled product by 300-400 meshes to obtain the additive.
  5. 5. The honeycomb ceramic with high heat storage performance according to claim 4, wherein the mass ratio of the fine powder to the pretreated expandable graphite is 1:0.1-0.15.
  6. 6. The honeycomb ceramic with high heat storage performance according to claim 4, wherein the pretreated expandable graphite is obtained by pretreating expandable graphite, and the pretreatment method comprises the steps of conveying the expandable graphite into a muffle furnace preheated to 800-1000 ℃, preserving heat for 30-40 s, and scattering after cooling to obtain pretreated expandable graphite.
  7. 7. The honeycomb ceramic with high heat storage performance according to claim 1, wherein the additive is prepared by mixing magnesium oxide, titanium diboride, yttrium oxide and absolute ethyl alcohol in a ball mill at 300-400 rpm for 4-6 hours, spray drying the obtained product material to obtain powder, placing the powder in an atmosphere furnace, heating to 1100-1200 ℃ at a rate of 5-8 ℃ per minute under the protection of argon, preserving heat for 1-2 hours, cooling along with the furnace, crushing, sieving for 300-400 meshes, and obtaining the additive.
  8. 8. The honeycomb ceramic with high heat storage performance according to claim 7, wherein the mass ratio of magnesium oxide, titanium diboride, yttrium oxide and absolute ethyl alcohol is 10:4-5:0.1-0.15:30-40.
  9. 9. The honeycomb ceramic with high heat storage performance according to claim 1, wherein the binder is silica sol.
  10. 10. The preparation method of the honeycomb ceramic with high heat storage performance according to any one of claims 1 to 9, which is characterized by comprising the steps of weighing raw materials according to requirements, adding the raw materials into a mixer, setting 60-100 rpm for stirring treatment for 40-60 min to obtain mixed powder, mixing the mixed powder with water according to a mass ratio of 1:0.2-0.3 to obtain pug, carrying out vacuum extrusion molding on the pug to obtain a blank, carrying out air drying, drying and sintering treatment on the blank, and cooling to obtain the honeycomb ceramic with high heat storage performance, wherein the drying temperature is 220-280 ℃, and the sintering temperature is 1500-1550 ℃.

Description

Honeycomb ceramic with high heat storage performance and preparation method thereof Technical Field The invention relates to the technical field of honeycomb ceramics, in particular to a honeycomb ceramic with high heat storage performance and a preparation method thereof. Background The honeycomb ceramic is a high-performance ceramic material with a porous honeycomb structure, and is widely applied to the fields of regenerative combustion systems, industrial waste gas treatment and the like due to the advantages of large specific surface area, good thermal stability, strong thermal shock resistance, pressure reduction and the like. In the prior art, when functional components with high heat conductivity or high specific heat capacity are introduced to improve the heat storage performance of the honeycomb ceramics, the difference of thermal expansion coefficients between the functional components and the ceramic matrix can cause microcracks to be generated due to the concentration of internal thermal stress in the process of repeated cold and hot circulation of the material, so that the service life of the honeycomb ceramics is restricted. Based on the above, the invention provides a honeycomb ceramic with high heat storage performance and a preparation method thereof. Disclosure of Invention The invention aims to provide the honeycomb ceramic with high heat storage performance and the preparation method thereof, and the prepared honeycomb ceramic with high heat storage performance has better heat conduction performance, excellent thermal shock resistance and compressive strength. The honeycomb ceramic with high heat storage performance comprises, by weight, 60-80 parts of cordierite, 20-30 parts of silicon carbide, 15-20 parts of fillers, 5-10 parts of additives, 5-10 parts of zirconia, 5-10 parts of fayalite, 1-3 parts of methylcellulose, 3-5 parts of binders and 3-5 parts of graphite powder; The raw materials of the additive comprise magnesium oxide, titanium diboride, yttrium oxide and absolute ethyl alcohol. The filler is prepared by mixing aluminum isopropoxide and absolute ethyl alcohol, adding deionized water and nitric acid, refluxing and stirring in a water bath at the temperature of 75-80 ℃ for 2-2.5 hours to obtain a first mixture for standby, mixing tetraethoxysilane and absolute ethyl alcohol, adding deionized water and nitric acid, stirring at the room temperature for 1-1.5 hours to obtain a second mixture, dripping the second mixture into the first mixture, stirring at the temperature of 55-65 ℃ for 3-4 hours to obtain a preparation material, uniformly mixing the preparation material and PVP at the temperature of 50-55 ℃ in a water bath, adding an additive, setting the ultrasonic dispersion treatment at the temperature of 300-500W for 20-30 minutes to obtain a mixed solution, injecting the mixed solution into an electrostatic spinning device, setting the injection speed to be 0.4-0.6 ml/h, the voltage to be 15-20 kV, stirring at the receiving distance of 10-20 cm to obtain a fiber material, heating the fiber material to a muffle furnace, setting the temperature to be 1-1.5 ℃ to 320-350 ℃ for 2.5 hours, soaking at the temperature to be 3-1150 ℃ for 3-3 hours, soaking at the temperature to 3-5 hours, setting the temperature to obtain a short fiber material, soaking at the temperature to be 3-80 ℃ in the temperature to obtain a short fiber material, soaking at the temperature to be heated at the temperature of 3-20 ℃ for 3-5 hours, setting the temperature, and then setting the temperature to be heated to be subjected to the temperature to 3-500 ℃ for 3-5 hours. Preferably, the mass ratio of aluminum isopropoxide to absolute ethyl alcohol to deionized water to nitric acid is 1:4-5:0.2-0.3:0.08-0.1, the mass ratio of ethyl orthosilicate to absolute ethyl alcohol to deionized water to nitric acid is 1:3.5-4:0.2-0.3:0.08-0.1, the mass ratio of the first mixture to the second mixture is 1:0.8-0.9, the mass ratio of the preparation material to PVP is 1:0.1-0.15, the mass ratio of the additive is 15-20% of the mass of the preparation material, and the treating agent is prepared by mixing KH550, ethanol and water according to the mass ratio of 1:70-80:10-15. Preferably, the additive is prepared by mixing sodium nitrate and potassium nitrate according to a mass ratio of 1:1, sending the mixture into a muffle furnace, maintaining the temperature at 250-300 ℃ for 40-60 min, cooling the obtained product, crushing and grinding the cooled product, sieving the cooled product by 100 meshes to obtain fine powder, mixing the fine powder with pretreated expandable graphite, sending the mixture into a vacuum drying oven at the temperature of 250 ℃, maintaining the temperature for 30min, cooling the obtained product, crushing and grinding the cooled product, and sieving the cooled product by 300-400 meshes to obtain the additive. Preferably, the mass ratio of the fine powder to the pretreated expandable graphite is