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CN-121975995-A - Ultralow-carbon aluminum zirconium barium magnesium converter sliding plate and preparation process thereof

CN121975995ACN 121975995 ACN121975995 ACN 121975995ACN-121975995-A

Abstract

The application relates to the field of green special refractory ceramics, and particularly discloses an ultralow-carbon aluminum-zirconium-barium-magnesium converter slide plate and a preparation process thereof. The ultra-low carbon aluminum zirconium barium magnesium converter sliding plate comprises, by weight, 60-80 parts of main materials, 1-3 parts of nano magnesium oxide, 4-8 parts of magnesium oxide, 20-30 parts of zirconium oxide, 1-4 parts of sintering agent and 3-6 parts of bonding agent, wherein the main materials comprise barium hexaaluminate and barium zirconate, and the preparation method comprises the steps of S1 mixing to obtain a mixture, S2 sintering the mixture under an oxygen atmosphere, immersing in oil, baking and cold processing to obtain the ultra-low carbon aluminum zirconium barium magnesium converter sliding plate. The ultralow-carbon aluminum zirconium barium magnesium converter sliding plate disclosed by the application hardly contains any carbon element, is excellent in oxidation resistance, effectively improves the cleanliness of molten steel, and obviously improves the thermal shock resistance and crack expansion resistance of the ultralow-carbon aluminum zirconium barium magnesium converter sliding plate due to the synergistic effect of the components.

Inventors

  • WEI HEYI
  • QU JINDONG
  • Shi deman
  • FU WEI
  • GAO JIAN

Assignees

  • 唐山时创高温材料股份有限公司

Dates

Publication Date
20260505
Application Date
20260131

Claims (10)

  1. 1. The ultra-low carbon aluminum zirconium barium magnesium converter sliding plate is characterized by comprising, by weight, 60-80 parts of main materials, 1-3 parts of nano magnesium oxide, 4-8 parts of magnesium oxide, 20-30 parts of zirconium oxide, 1-4 parts of sintering agent and 3-6 parts of bonding agent, wherein the main materials comprise barium hexaaluminate and barium zirconate.
  2. 2. The ultra-low carbon aluminum zirconium barium magnesium converter skateboard of claim 1, wherein the weight ratio of barium hexaaluminate to barium zirconate is (75-85): (15-25).
  3. 3. The ultra-low carbon aluminum zirconium barium magnesium converter skateboard of claim 2, wherein the weight ratio of barium hexaaluminate to barium zirconate is 80:20.
  4. 4. The ultra-low carbon aluminum zirconium barium magnesium converter skateboard of claim 1, wherein the sintering agent is aluminum powder with particle size <28 μm.
  5. 5. The ultra-low carbon aluminum zirconium barium magnesium converter slip sheet according to claim 1, wherein the binder comprises one or more of polyvinyl alcohol, calcium lignosulfonate, and phenolic resin.
  6. 6. The ultra-low carbon aluminum zirconium barium magnesium converter skateboard of claim 5, wherein the binder comprises polyvinyl alcohol, calcium lignosulfonate and phenolic resin in a weight ratio of 2:2:6.
  7. 7. The ultralow-carbon aluminum-zirconium-barium-magnesium converter skateboard according to claim 5, wherein the phenolic resin is boron modified phenolic resin, and the preparation method comprises the following specific steps: Mixing phenol and formaldehyde, regulating pH to be less than 3, then heating to 60-80 ℃, reacting for 40-80min, adding boric acid, continuously reacting until the mixture is not diffused in the system after heating to 25 ℃, stopping the reaction, regulating pH to be neutral, adding water, stirring, standing for layering, removing a water layer, washing a resin layer at the bottom, and dehydrating to obtain the boron modified phenolic resin, wherein the weight ratio of the phenol to the formaldehyde to the boric acid is (100-105): 30 (5.0-5.5).
  8. 8. The ultra-low carbon aluminum zirconium barium magnesium converter skateboard of claim 6, wherein the binder further comprises ethylene-vinyl acetate copolymer in an amount of 60-70wt% of the total amount of polyvinyl alcohol.
  9. 9. A process for preparing the ultralow-carbon aluminum zirconium barium magnesium converter skateboard according to any one of claims 1-8, which is characterized by comprising the following steps: s1, mixing a main material, nano magnesium oxide, zirconium oxide and a sintering agent together, and then adding a bonding agent for continuous mixing to obtain a mixture; S2, firing the mixture at the temperature of 1500-1650 ℃ in an oxygen atmosphere, and performing oil immersion, baking and cold processing to obtain the ultralow-carbon aluminum-zirconium-barium-magnesium converter skateboard.
  10. 10. The process for preparing the ultralow-carbon aluminum-zirconium-barium-magnesium converter skateboard according to claim 9, wherein in the step S1, the mixing temperature before adding the bonding agent is 20-30 ℃, and the mixing temperature after adding the bonding agent is 40-60 ℃.

Description

Ultralow-carbon aluminum zirconium barium magnesium converter sliding plate and preparation process thereof Technical Field The application relates to the technical field of green special refractory ceramics, in particular to an ultralow-carbon aluminum-zirconium-barium-magnesium converter slide plate and a preparation process thereof. Background The converter is used as core equipment for modern steel smelting and has a vital role in the steelmaking process. The steelmaking mode has the advantages of short smelting period, no need of external heat source, suitability for mass continuous production and the like, greatly promotes the development of the iron and steel industry, and meets a great deal of demands of society on iron and steel products. With the continuous progress of the steel industry, the performance requirements on related equipment and materials of the converter are increasingly improved, so that the quality and efficiency of steelmaking are further improved. At present, a converter slide plate is used as a key functional refractory material in converter equipment and needs to bear high-temperature molten steel scouring and chemical erosion. The mainstream technical routes include magnesia carbon, alumina carbon and zirconia carbon skateboards. The magnesium carbon slide plate is a common type, can meet the use requirement of the converter slide plate to a certain extent, is a common choice and plays a role in a specific steelmaking scene, and the zirconium carbon slide plate is adopted under the condition of higher requirements on the slide plate performance by virtue of certain characteristics. At the same time, composite oxide-carbonaceous material systems have also become a research hotspot. However, the prior art has significant drawbacks. The magnesium-carbon slide plate has poor thermal shock resistance, is easy to damage due to thermal stress in the use process, has insufficient high-temperature strength, is difficult to bear the scouring of high-temperature molten steel, and has high cost and is easy to generate ZrO 2 phase change cracks. For a composite oxide-carbonaceous material system, too high a carbon content can lead to accelerated damage of oxidized carbon loss, while too low a carbon content can hardly ensure thermal shock resistance. Even if the oxidation resistance and the molten steel cleanliness are improved by removing the carbon component in the converter sliding plate, the problem of the reduction of the thermal shock buffering capacity caused by removing the carbon element is remarkable, so that the optimization of the comprehensive performance of the carbon-aluminum-zirconium-barium-magnesium converter sliding plate becomes a great difficulty in the preparation of refractory ceramics. Disclosure of Invention In order to solve the technical problems, the application provides an ultralow-carbon aluminum-zirconium-barium-magnesium converter sliding plate and a preparation process thereof. The application provides an ultralow-carbon aluminum zirconium barium magnesium converter sliding plate which comprises, by weight, 60-80 parts of main materials, 1-3 parts of nano magnesium oxide, 4-8 parts of magnesium oxide, 20-30 parts of zirconium oxide, 1-4 parts of a sintering agent and 3-6 parts of a binding agent, wherein the main materials comprise barium hexaaluminate and barium zirconate. Preferably, the weight ratio of the barium hexaaluminate to the barium zirconate is (75-85): 15-25. Preferably, the weight ratio of the barium hexaaluminate to the barium zirconate is 80:20. Preferably, the sintering agent is aluminum powder with the particle size of less than 28 mu m. Preferably, the binder comprises one or more of polyvinyl alcohol, calcium lignosulfonate and phenolic resin. According to the technical scheme, barium hexaaluminate and barium zirconate are used as main materials, a hexagonal layered structure of the barium hexaaluminate can absorb thermal stress through grain boundary sliding, meanwhile, stable barium aluminate phases are formed at high temperature, crack growth is restrained, the cubic perovskite structure of the barium zirconate can undergo reversible phase transition at high temperature (1200 ℃), crack energy is consumed through a stress induced phase transition toughening mechanism, zirconium oxide can undergo transformation from a tetragonal phase to a monoclinic phase, a certain expansion occurs in volume, a compressive stress field is generated at the crack tip, fracture toughness is remarkably improved, meanwhile, the thermal conductivity of the material is reduced, the temperature gradient in thermal shock is relieved, magnesium oxide and nano magnesium oxide can fill grain boundary pores, magnesium aluminate spinel is generated through continuous reaction with aluminum oxide generated in the reaction, and the thermal expansion coefficient is between the main materials and the zirconium oxide, so that interface stress can be relieved. The barium