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CN-121974666-A - Sintered slag blocking slide plate and preparation method thereof

CN121974666ACN 121974666 ACN121974666 ACN 121974666ACN-121974666-A

Abstract

The invention provides a sintering slag-blocking slide plate and a preparation method thereof, which belong to the technical field of steelmaking refractory materials, wherein the sintering slag-blocking slide plate is prepared by mixing, forming and drying raw materials, and the raw materials comprise: corundum aggregate, graphite, a binding agent, a reinforcing agent, an additive and auxiliary materials. The reinforcing agent is ferrosilicon nitride, the additive comprises metallic aluminum and zirconium oxide, the auxiliary material comprises metallic silicon powder and silicon carbide powder, and the sintering process is to sinter at 1250-1350 ℃ in nitrogen atmosphere, so that the components in the raw materials react to generate a ceramic bonding phase comprising Si 3 N 4 and AlN. According to the sintering slag-blocking slide plate and the preparation method thereof, a stable ceramic bonding phase is generated during sintering, the traditional carbon bonding phase is replaced, and the erosion resistance, the wear resistance and the thermal shock stability of the slide plate are remarkably improved.

Inventors

  • AI LI
  • ZHANG YANG
  • XIAO CHAO
  • LIU ZHIHUI
  • YUE JIANXING

Assignees

  • 唐山首尔耐火材料有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. The sintering slag-blocking slide plate is prepared by mixing, forming, drying and sintering raw materials, and is characterized by comprising corundum aggregate, graphite, a bonding agent, an enhancer, an additive and auxiliary materials; Wherein the reinforcing agent is silicon iron nitride; The additive comprises metallic aluminum and zirconium oxide; the auxiliary materials comprise metal silicon powder and silicon carbide powder; The firing is performed at 1250-1350 ℃ in a nitrogen atmosphere, so that components in the raw materials react to generate a ceramic bonding phase comprising Si 3 N 4 and AlN.
  2. 2. The fired slag slide of claim 1, wherein the binder is a phenolic resin.
  3. 3. The firing slag blocking slide plate as claimed in claim 1, wherein the raw materials comprise, by mass, 55-75 parts of corundum aggregate, 5-12 parts of graphite, 3-6 parts of a binding agent, 2-5 parts of a reinforcing agent, 1-4 parts of an additive, 1-3 parts of metal silicon powder and 1-2 parts of silicon carbide powder.
  4. 4. The fired slag slide of claim 1, wherein the mass ratio of metallic aluminum to zirconia in the admixture is from 2:1 to 3:1.
  5. 5. A method for manufacturing a sintered slag-blocking slide plate as claimed in any one of claims 1 to 4, comprising the steps of: s1, mixing the raw materials to obtain pug; S2, molding the pug to obtain a blank; S3, drying the blank; S4, performing carbon-free sintering at 1250-1350 ℃ in a nitrogen atmosphere to enable components in the raw materials to react to generate a ceramic bonding phase comprising Si 3 N 4 and AlN, so as to prepare the sintered slag-blocking slide plate.
  6. 6. The method of claim 5, wherein step S1 comprises mixing the materials with a mixer and feeding in the following order: s11, adding corundum aggregate for dry mixing; s12, adding the reinforcing agent and the additive, and continuously dry-mixing; S13, adding graphite and auxiliary materials, and continuously dry-mixing; s14, adding a binding agent and mixing while adding.
  7. 7. The preparation method according to claim 6, wherein in the steps S11 to S13, the rotational speed of the mixer is 700 to 900r/min, and in the step S14, the rotational speed of the mixer is 350 to 450r/min; the mixing time of the step S11 is 4-6min, the mixing time of the step S12 is 3-5min, the mixing time of the step S13 is 2-4min, and the mixing time of the step S14 is 8-12min.
  8. 8. The method of claim 6, wherein the binder is preheated to 40-50 ℃ and then mixed in step S14.
  9. 9. The method of claim 5, wherein in step S3, the green body is naturally dried for a predetermined period of time, and then dried by using a gradient heating method.
  10. 10. The preparation method of claim 5, wherein the step S4 is performed in a nitriding furnace, the process parameters are that the temperature rise rate is 5-8 ℃ per minute, the temperature is kept for 8-12 hours, the purity of nitrogen is more than or equal to 99.9%, and the pressure in the nitriding furnace is 0.1-0.3MPa.

Description

Sintered slag blocking slide plate and preparation method thereof Technical Field The invention belongs to the technical field of steelmaking refractory materials, and particularly relates to a sintering slag-blocking slide plate and a preparation method thereof. Background The slag blocking slide plate is a key refractory component for realizing slag blocking tapping and purifying molten steel in the steelmaking process, is mainly arranged at the bottom of a converter tapping hole or a continuous casting tundish, and is required to bear scouring of high-temperature molten steel (1500-1650 ℃), chemical erosion of slag, mechanical abrasion caused by frequent switching operation and thermal stress impact caused by sudden temperature rising and falling in the service process, so that the service environment is extremely harsh, and corrosion, abrasion, peeling and even fracture are easy to occur, thereby leading to early failure replacement. At present, the existing slag-blocking sliding plate is mainly prepared from aluminum carbon and aluminum zirconium carbon materials, and the sintering process of the existing slag-blocking sliding plate is mainly dependent on a high-temperature kiln (1450 ℃) for carbon burying sintering, so that the process has the defects that firstly, the carbon burying kiln is loaded, the kiln discharging process is complicated, a large amount of carbon burying materials are required to be consumed, the labor intensity is high, the production efficiency is low, secondly, the high-temperature sintering energy consumption is high, the production cost is greatly increased, thirdly, the existing sliding plate is mainly dependent on the carbon bonding phase lifting performance, carbon is easily oxidized under the high-temperature strong oxidation environment, the structure of the sliding plate is loose, the strength is reduced, the corrosion resistance and the wear resistance are insufficient, the service life is generally short, the consumption of refractory materials is increased due to frequent replacement, and the continuous steelmaking operation is also interrupted, so that the production progress is influenced. In the prior art, partial improvement schemes attempt to improve the performance of the skateboard by adding a single additive, but the problems of poor adaptability of the additive and a matrix and limited performance improvement exist, and the core pain points of complicated high-temperature carbon-embedded sintering process and high cost are not solved. Therefore, developing a sintering slag-blocking slide plate which realizes dual improvement of performance and economy through formula optimization (adding reinforcing agents and additives) and matching with a simplified sintering process becomes a technical problem to be solved in the field. Disclosure of Invention Aiming at the technical defects that the existing slag blocking slide plate is insufficient in erosion resistance and abrasion resistance and short in service life, and the sintering process depends on high-temperature kiln carbon burying sintering, complicated procedures and high cost, the invention provides the sintering slag blocking slide plate and the preparation method thereof, and the reinforcing agent and the additive with excellent suitability are added to enable the slag blocking slide plate to react with nitrogen to generate a stable ceramic bonding phase when being sintered in a nitriding furnace, so that the erosion resistance, abrasion resistance and thermal shock stability of the slide plate are obviously improved, and meanwhile, the complicated process of high-temperature kiln carbon burying and kiln discharging is eliminated, the production flow is simplified, the production cost is reduced, the service life of the slide plate is prolonged, and the defects in the prior art are solved. The technical scheme adopted by the invention is that the sintering slag-blocking slide plate is prepared by mixing, forming and drying raw materials and sintering the raw materials, and is characterized in that the raw materials comprise corundum aggregate, graphite, a bonding agent, a reinforcing agent, an additive and auxiliary materials; Wherein the reinforcing agent is silicon iron nitride; The additive comprises metallic aluminum and zirconium oxide; the auxiliary materials comprise metal silicon powder and silicon carbide powder; the firing is performed at 1250-1350 ℃ in a nitrogen atmosphere, so that components in the raw materials react to generate a ceramic bonding phase comprising Si3N4 and AlN. In one possible implementation, the binder is a phenolic resin. In a possible implementation mode, the raw materials comprise 55-75 parts of corundum aggregate, 5-12 parts of graphite, 3-6 parts of bonding agent, 2-5 parts of reinforcing agent, 1-4 parts of additive, 1-3 parts of metal silicon powder and 1-2 parts of silicon carbide powder in parts by weight. In one possible implementation, the mass ratio of metalli