Search

CN-122010581-A - High-strength wear-resistant heat-preservation type refractory material for dry quenching and preparation method thereof

CN122010581ACN 122010581 ACN122010581 ACN 122010581ACN-122010581-A

Abstract

The invention discloses a high-strength wear-resistant heat-preservation type refractory material for dry quenching and a preparation method thereof, and relates to the technical field of refractory materials, wherein the refractory material comprises, by weight, 60-70 parts of silicon carbide, 0.5-1 part of ferric oxide, 10-15 parts of aluminum oxide, 5-7 parts of an auxiliary agent and 8-12 parts of mullite powder. According to the invention, by using an auxiliary agent with a proper amount and matching with silicon carbide, mullite powder, ferric oxide and alumina, the thermal insulation performance of the prepared refractory material for dry quenching meets the use requirement, and meanwhile, the refractory material for dry quenching is endowed with high normal-temperature compressive strength, high-temperature flexural strength and wear resistance.

Inventors

  • QIAN JING
  • QIAN ZHIMING
  • LIU CHENGQIANG
  • BAI YINGYING
  • ZHU XIUFEN

Assignees

  • 江苏诺明高温材料股份有限公司

Dates

Publication Date
20260512
Application Date
20260212

Claims (10)

  1. 1. The high-strength wear-resistant heat-preservation type refractory material for dry quenching is characterized by comprising, by weight, 60-70 parts of silicon carbide, 0.5-1 part of ferric oxide, 10-15 parts of aluminum oxide, 5-7 parts of an auxiliary agent and 8-12 parts of mullite powder.
  2. 2. The high-strength wear-resistant heat-preservation type refractory material for dry quenching as claimed in claim 1, wherein the preparation method of the auxiliary agent comprises the following steps: The preparation method comprises the steps of (1) carrying out vacuum drying on carbon black, carrying out ultrasonic dispersion to obtain pretreated carbon black, carrying out vacuum drying on boron oxide to obtain pretreated boron oxide, carrying out mixed ball milling on magnesium powder, polytetrafluoroethylene and ball milling medium in protective gas to obtain pretreated magnesium powder, and carrying out mixed stirring on the pretreated carbon black, the pretreated boron oxide and the pretreated magnesium powder in the protective gas to obtain mixed powder; Mixing titanium dioxide powder and absolute ethyl alcohol, performing ultrasonic dispersion, adding undecylenic acid, heating and stirring, and performing aftertreatment to obtain a product 1; And (3) mixing and stirring the mixed powder and the rosin solution in the protective gas, adding the mixture into the phenolic resin solution, grinding, adding the titanium dioxide dispersion liquid containing epoxy groups and the DMP-30, heating and stirring, and performing post-treatment to obtain the auxiliary agent.
  3. 3. The high-strength wear-resistant heat-preservation type refractory material for dry quenching as claimed in claim 2, wherein in the step (1), the ratio of the total mass of magnesium powder and polytetrafluoroethylene to the mass of a ball milling medium is 1:20-25, and the ball milling medium is polytetrafluoroethylene balls.
  4. 4. The high-strength wear-resistant heat-preservation type refractory material for dry quenching according to claim 2 is characterized in that in the step (1), the dosage ratio of magnesium powder to polytetrafluoroethylene is 70-75g:25-30g, and the dosage ratio of pretreated carbon black to pretreated boron oxide to pretreated magnesium powder is 15-17g:58-59g:63-65g.
  5. 5. The refractory material for high-strength wear-resistant thermal insulation type dry quenching as claimed in claim 2, wherein in the step (2), the dosage ratio of the titanium dioxide powder, the absolute ethyl alcohol and the undecylenic acid is 10-12g:55-65mL:0.5-1g.
  6. 6. The refractory material for high-strength wear-resistant heat-preservation type dry quenching as claimed in claim 2, wherein in the step (2), the dosage ratio of the product 1, the absolute ethyl alcohol and the oxidant is 13-15g:70-80mL:8-10mL.
  7. 7. The refractory material for high-strength wear-resistant thermal insulation type dry quenching according to claim 2, wherein in the step (3), the mixed powder, the rosin solution, the phenolic resin solution, the epoxy group-containing titanium dioxide dispersion liquid and the DMP-30 are used in an amount ratio of 1g to 1.5-2mL to 10-15mL to 8-10mL to 15-20mg.
  8. 8. The high-strength wear-resistant heat-preservation type refractory material for dry quenching according to claim 2, wherein in the step (3), the rosin solution is obtained by mixing and stirring rosin and absolute ethyl alcohol according to the proportion of 1g to 10-15mL, and the phenolic resin solution is obtained by mixing phenolic resin and absolute ethyl alcohol according to the proportion of 5-10g to 100mL, stirring for 20-30min at 60-70 ℃, and cooling.
  9. 9. The high-strength wear-resistant heat-preservation type refractory material for dry quenching according to claim 2, wherein in the step (3), the epoxy group-containing titanium dioxide dispersion liquid is obtained by mixing and ultrasonic dispersing epoxy group-containing titanium dioxide and absolute ethyl alcohol according to the proportion of 10-12g:60-70 mL.
  10. 10. A method for preparing the refractory material for high-strength wear-resistant heat-preserving dry quenching according to any one of claims 1 to 9, which is characterized by comprising the following steps: Mixing silicon carbide, ferric oxide, aluminum oxide and mullite powder, stirring for 30-35min, adding an auxiliary agent, continuously stirring for 10-15min, performing compression molding, heating and preserving heat for 8-12h in protective gas, continuously heating and preserving heat for 2-3h, cooling, and then naturally cooling to obtain the high-strength wear-resistant heat-preserving refractory material for dry quenching.

Description

High-strength wear-resistant heat-preservation type refractory material for dry quenching and preparation method thereof Technical Field The invention relates to the technical field of refractory materials, in particular to a high-strength wear-resistant heat-preservation type refractory material for dry quenching and a preparation method thereof. Background The refractory for dry quenching includes a refractory used in a dry quenching process, such as a lining refractory for a dry quenching furnace. The working environment in the coke dry quenching furnace is bad, so that the strength, the wear resistance, the thermal shock resistance and the like of the lining refractory material are required to be higher. Among them, patent publication No. CN101580395B, entitled "refractory for dry quenching", discloses a silicon carbide refractory for dry quenching, which has a heat insulating property to be further improved because it contains a relatively large amount of raw materials having relatively high thermal conductivity such as silicon carbide and β -silicon carbide, and in which the silicon carbide matrix is easily eroded during long-term use, resulting in deterioration of strength, wear resistance, thermal shock resistance, and the like of the refractory for dry quenching. The boron carbide has high hardness, and can form a hard framework in the use environment in the dry quenching furnace, so that the scouring and abrasion of slag and metal are effectively resisted, and the silicon carbide substrate is protected from erosion. Therefore, further studies are required on how to add boron carbide and other additives to a silicon carbide refractory for dry quenching to obtain a refractory for dry quenching having excellent strength, wear resistance, and heat retaining properties. Disclosure of Invention In order to solve the technical problems, the invention provides a high-strength wear-resistant heat-preservation type refractory material for dry quenching and a preparation method thereof. The aim of the invention can be achieved by the following technical scheme: The high-strength wear-resistant heat-insulating refractory material for dry quenching comprises, by weight, 60-70 parts of silicon carbide, 0.5-1 part of ferric oxide, 10-15 parts of aluminum oxide, 5-7 parts of an auxiliary agent and 8-12 parts of mullite powder. The preparation method of the high-strength wear-resistant heat-preservation type refractory material for dry quenching comprises the following steps: Mixing silicon carbide, ferric oxide, aluminum oxide and mullite powder, stirring for 30-35min, adding an auxiliary agent, continuously stirring for 10-15min, performing compression molding, heating and preserving heat for 8-12h in protective gas, continuously heating and preserving heat for 2-3h, cooling, and then naturally cooling to obtain a high-strength wear-resistant heat-preserving refractory material for dry quenching; Further, stirring for 30-35min at 35-40rpm, continuing stirring for 10-15min at 50-60rpm, and pressing to form at 100-200MPa; further, heating and preserving heat at a rate of 2-3 ℃ per minute to 130-150 ℃ and then preserving heat, and continuously heating and preserving heat at a rate of 3-4 ℃ per minute to 1450-1500 ℃ and then preserving heat; Further, the temperature is reduced to 750-800 ℃ at a rate of 4-5 ℃ per minute. The preparation method of the auxiliary agent comprises the following steps: The preparation method comprises the steps of (1) carrying out vacuum drying on carbon black, carrying out ultrasonic dispersion to obtain pretreated carbon black, carrying out vacuum drying on boron oxide to obtain pretreated boron oxide, carrying out mixed ball milling on magnesium powder, polytetrafluoroethylene and ball milling medium in protective gas to obtain pretreated magnesium powder, and carrying out mixed stirring on the pretreated carbon black, the pretreated boron oxide and the pretreated magnesium powder in the protective gas to obtain mixed powder; Mixing titanium dioxide powder and absolute ethyl alcohol, performing ultrasonic dispersion, adding undecylenic acid, heating and stirring, and performing aftertreatment to obtain a product 1; And (3) mixing and stirring the mixed powder and the rosin solution in the protective gas, adding the mixture into the phenolic resin solution, grinding, adding the titanium dioxide dispersion liquid containing epoxy groups and the DMP-30, heating and stirring, and performing post-treatment to obtain the auxiliary agent. Further, the preparation method of the auxiliary agent comprises the following specific steps: The method comprises the steps of (1) vacuum drying carbon black for 4-4.5h to obtain pretreated carbon black, vacuum drying boron oxide for 8-8.5h to obtain pretreated boron oxide, mixing magnesium powder, polytetrafluoroethylene and ball milling medium in protective gas, ball milling for 1.5-2.1h to obtain pretreated magnesium powder, mixing and stirring the pretr