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CN-122010538-A - Wear-resistant ceramic lining plate and preparation method thereof

CN122010538ACN 122010538 ACN122010538 ACN 122010538ACN-122010538-A

Abstract

The invention belongs to the technical field of ceramic lining plate preparation, and particularly relates to a wear-resistant ceramic lining plate and a preparation method thereof. The wear-resistant ceramic lining plate is composed of the following raw materials of aluminum oxide, a sintering aid, aluminum titanate, modified urea-formaldehyde resin microspheres, hafnium boride, tungsten disilicide and KH-550 silane coupling agent, wherein the sintering aid is a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide. The wear-resistant ceramic lining plate disclosed by the invention takes aluminum oxide as a main raw material, a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide as a sintering aid, a compound of modified urea-formaldehyde resin microspheres, hafnium boride and tungsten disilicide as a reinforcing and toughening phase, aluminum titanate as a regulator, and the raw materials are cooperated to ensure that the prepared ceramic lining plate has better wear resistance, hardness and toughness.

Inventors

  • LIU XIAONA
  • LIU FEIYU
  • LIU JUN
  • LIU KEWU

Assignees

  • 淄博和润马科托矿业技术有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. A wear-resistant ceramic lining plate is characterized by comprising, by weight, 100 parts of aluminum oxide, 3.8-4.2 parts of a sintering aid, 5-7 parts of aluminum titanate, 3-4 parts of modified urea formaldehyde resin microspheres, 4-6 parts of hafnium boride, 1.5-1.7 parts of tungsten disilicide, 0.8-1.0 part of KH-550 silane coupling agent, wherein the sintering aid is a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide, the preparation method of the modified urea formaldehyde resin microspheres comprises the steps of ① preparation of a metal salt-citric acid complexing solution, ② preparation of a urea formaldehyde prepolymer solution, ③ pouring the urea formaldehyde prepolymer solution into a reaction vessel, dropwise adding the metal salt-citric acid complexing solution into the urea formaldehyde prepolymer solution under a room temperature stirring state, adjusting the pH value of a system to be 5.5, continuing stirring until complexing is complete, ④ preparing a gel solution through polycondensation reaction, ⑤ oil phase solidification molding, ⑥ washing, drying and screening to prepare the modified urea formaldehyde resin microspheres.
  2. 2. The wear-resistant ceramic lining plate according to claim 1, wherein the mass ratio of niobium pentoxide to strontium oxide to lanthanum oxide to magnesium oxide in the sintering aid is 0.5:1:2:2.
  3. 3. The wear-resistant ceramic lining plate according to claim 1, wherein the preparation method of the modified urea-formaldehyde resin microsphere comprises the steps of ① preparing metal salt-citric acid complexing solution, namely adding citric acid and water-soluble phenolic resin into deionized water accounting for 35% of the total mass of the deionized water, stirring for 15min at a rotating speed of 40 ℃ and 300r/min, adding niobium oxalate, stirring for 15min, adding ammonium heptamolybdate tetrahydrate, stirring for 10min, adding chromium nitrate, stirring for 10min, finally adding deionized water accounting for 65% of the total mass of the deionized water, continuously stirring until clarification, and preparing the metal salt-citric acid complexing solution; in the preparation of the metal salt-citric acid complexing solution in step ①, the molar ratio of metal elements in niobium oxalate, ammonium heptamolybdate tetrahydrate and chromium nitrate is 3:4:2, and the concentration of total metal ions in the total deionized water is controlled to be 0.67mol/L; In the preparation of the metal salt-citric acid complexing solution in the step ①, the ratio of the sum of the amounts of the substances of the molybdenum element contained in niobium oxalate, chromium nitrate and ammonium heptamolybdate tetrahydrate to the amount of the substance of citric acid is 1:1.4; In step ①, the ratio of the sum of the amounts of the substances of molybdenum element contained in niobium oxalate, chromium nitrate and ammonium heptamolybdate tetrahydrate to the amount of the substances of the water-soluble phenolic resin in the preparation of the metal salt-citric acid complex solution is 1:1.8.
  4. 4. The wear-resistant ceramic lining plate of claim 1, wherein the preparation method of the urea-formaldehyde prepolymer in step ② is characterized in that urea is dissolved in deionized water, stirred at room temperature until the urea is completely dissolved, formaldehyde solution is added, stirring and mixing are continued for 17min, the urea-formaldehyde prepolymer is prepared, the mass ratio of urea to formaldehyde is 1:1.6, the mass concentration of the formaldehyde solution is 37%, and the mass ratio of urea to deionized water is 1:0.92.
  5. 5. The method of claim 1, wherein the step ③ is to pour the urea formaldehyde pre-polymer solution into a reaction vessel, stir the solution at a stirring speed of 350r/min at room temperature, drop-feed the metal salt-citric acid complex solution into the reaction vessel at a dropping speed of 5mL/min for 30min, then add 1mol/L NaOH solution to adjust the pH value of the system to 5.5, and continuously stir the solution at a speed of 300r/min for 60min until the solution is completely complexed, wherein the volume ratio of the urea formaldehyde pre-polymer solution to the metal salt-citric acid complex solution is 0.83:1.
  6. 6. The wear-resistant ceramic lining board of claim 1, wherein the gel liquid prepared by the polycondensation reaction in step ④ is specifically obtained by heating the temperature of the reaction system from room temperature to 80 ℃ within 15min at a rotation speed of 300r/min, then adjusting the rotation speed to 250r/min, continuously stirring and reacting for 60min at 80 ℃, stopping stirring, and finishing the polycondensation reaction.
  7. 7. The wear-resistant ceramic lining board of claim 1, wherein the oil phase solidification molding step ⑤ is characterized in that liquid paraffin is used as the oil phase, a gel liquid is sucked into a syringe, a needle head is vertically fixed according to 21G after air bubbles are removed, the distance between the needle head and the liquid paraffin is 4cm, the dripping speed is controlled to be 30 drops/min, the gel liquid is dripped into the liquid paraffin, the liquid paraffin is immediately contracted into a group after the liquid is dripped into the oil, the liquid paraffin is firstly subjected to standing solidification for 2.5 hours after the dripping is finished, the standing solidification temperature is 77 ℃, and then the liquid paraffin is naturally cooled to room temperature.
  8. 8. The wear-resistant ceramic lining board of claim 1, wherein the step ⑥ is characterized in that the modified urea-formaldehyde resin microspheres are prepared by washing the microspheres with petroleum ether at 75 ℃ for 3 times, 10 minutes each time, then with absolute ethyl alcohol for three times, 10 minutes each time, and finally with deionized water for 1 time, wherein the washing time is 8 minutes, natural ventilation drying is carried out at 25 ℃ for 20 hours, drying is carried out at 41 ℃ for 12 hours, drying is carried out at 61 ℃ for 10 hours, drying is carried out at 82 ℃ for 8 hours, and standard screening is adopted finally, and the microspheres which pass through a 14-mesh sieve and are trapped between 18-mesh sieves are collected.
  9. 9. A method for preparing a wear-resistant ceramic lining plate according to claim 1 is characterized by comprising the following steps: (1) Uniformly mixing KH-550 silane coupling agent, deionized water and ethanol, adding acetic acid to adjust the pH value of the system to 4.0, and stirring and hydrolyzing at room temperature for 30-35min to obtain hydrolysate; (2) Adding aluminum oxide, aluminum titanate, hafnium boride and sintering aid into a ball milling tank, adding hydrolysate, ball milling for 35-40min, then adding modified urea resin microspheres, continuing ball milling for 30-35min, and finally adding deionized water and tungsten disilicide, continuing ball milling for 25-30min, thus preparing slurry; (3) Drying the slurry in a vacuum drying oven, grinding and sieving with a 200-mesh sieve to obtain granulating powder; (4) Filling the granulating powder into a mould for dry pressing and forming to prepare a blank; (5) Placing the blank in a graphite mold, placing the graphite mold into a hot pressing furnace, vacuumizing, heating to 200 ℃ at a heating rate of 5 ℃ per minute for 30min, heating to 600-610 ℃ at a heating rate of 2 ℃ per minute for 30min, then charging argon into the furnace until the pressure is 0.25MPa, heating to 1100-1105 ℃ at a heating rate of 5 ℃ per minute, loading axial mechanical pressure to 35MPa in 20min, keeping the pressure, heating to 1650-1680 ℃ at a heating rate of 5 ℃ per minute for 1.5h, cooling to room temperature along with the furnace under the condition of keeping the pressure of 35MPa after the heat preservation is finished, and demoulding to obtain the wear-resistant ceramic lining plate.
  10. 10. The method for preparing the wear-resistant ceramic lining plate according to claim 9, wherein the mass ratio of KH-550 silane coupling agent, ethanol and deionized water in the step (1) is 1:144:16; Adding aluminum oxide, aluminum titanate, hafnium boride and sintering aid into a ball milling tank, adding hydrolysate, ball milling for 35-40min at a ball milling speed of 250r/min, then adding modified urea resin microspheres, continuing ball milling for 30-35min at a ball milling speed of 150r/min, finally adding deionized water and tungsten disilicide, continuing ball milling for 25-30min at a ball milling speed of 150r/min, and preparing slurry, wherein zirconia balls with a diameter of 1mm are selected as grinding media in the whole ball milling process; Adding deionized water into the step (2) to regulate and control the solid content of the slurry to 55-60%; the vacuum drying temperature in the step (3) is 60 ℃, and the vacuum drying time is 5.5-6h; The pressure of the dry press molding in the step (4) is 180MPa, and the time of the dry press molding is 15s.

Description

Wear-resistant ceramic lining plate and preparation method thereof Technical Field The invention belongs to the technical field of ceramic lining plate preparation, and particularly relates to a wear-resistant ceramic lining plate and a preparation method thereof. Background In the transportation and storage process of the concentrating mill, in order to solve the abrasion problem of equipment, pipelines, chute, bin and the like, the abrasion-resistant lining plates which are generally adopted are cast stone, high-chromium cast iron, alumina ceramics, ultra-high molecular weight polyethylene and the like. As the Mohs hardness of the materials washed and selected by the concentrating mill is high, the lining of equipment, a chute and a bin wall is seriously worn, a large amount of overhaul work is increased, and meanwhile, great hidden danger is brought to safe production. Therefore, it is important to improve the wear resistance and impact resistance of the equipment lining plate. The common lining board wear-resistant materials are ① high-chromium cast iron, namely high-chromium cast iron with carbon content of 0.6-2%, chromium content of 13-25% and higher hardness, and the wear-resistant materials have higher hardness but large brittleness, are easy to break edges and crack under the working condition of large-particle material impact or equipment start-stop vibration, and cannot bear heavier impact load. ② The cast stone is a nonmetallic wear-resistant material with fine and compact grains, which is prepared by taking natural limestone, lime, green rock or basalt as a main material and adding a small amount of additives through the processes of high-temperature melting, casting forming, crystallization annealing and the like, and has better wear resistance, but the thickness of a lining plate after forming is larger, the effective volume of equipment can be occupied, the defects of uneven surface and inner compactness, internal shrinkage cavity and the like are easy to occur in the casting process, and the defects are easy to be caused to fail due to the expansion of internal cracks under long-term impact. ③ The ultra-high molecular weight polyethylene is thermoplastic engineering plastic, and has better self-lubricity and impact strength. But the heat-resistant temperature is low, the softening deformation is easily caused by the temperature rise generated by friction and extrusion in the material conveying process of the concentrating mill, the hardness is low, the abrasion rate is high when facing the long-term scouring of high-hardness ores, the service life is short, and meanwhile, under the impact of high-drop large-particle ores, plastic deformation, sinking and even tearing are easy to occur, so that the use requirement of the high-strength impact working condition cannot be met. ④ The alumina ceramic is prepared by uniformly mixing Al 2O3 powder below 100 meshes and adding various wear-resistant materials, dry pressing or isostatic pressing by a 100t press to obtain blank, and sintering at 1700 deg.C. Although the alumina ceramic has better hardness and wear resistance, the alumina ceramic has high brittleness and is easy to crack and fall off under strong impact. Therefore, aiming at the severe working conditions of high fall, large particles and strong impact of the concentrating mill, a novel wear-resistant ceramic lining plate needs to be explored. Disclosure of Invention The invention aims to provide a wear-resistant ceramic lining plate which has better wear resistance and toughness, and a preparation method thereof. The wear-resistant ceramic lining plate comprises, by weight, 100 parts of aluminum oxide, 3.8-4.2 parts of a sintering aid, 5-7 parts of aluminum titanate, 3-4 parts of modified urea formaldehyde resin microspheres, 4-6 parts of hafnium boride, 1.5-1.7 parts of tungsten disilicide, 0.8-1.0 parts of KH-550 silane coupling agent, wherein the sintering aid is a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide, the preparation method of the modified urea formaldehyde resin microspheres comprises the steps of preparing ① metal salt-citric acid complex solution, preparing ② urea formaldehyde prepolymer solution, pouring ③ urea formaldehyde prepolymer solution into a reaction vessel, dropwise adding the metal salt-citric acid complex solution into the urea formaldehyde prepolymer solution under the stirring state at room temperature, adjusting the pH value of the system to be 5.5, continuing stirring until the complex is complete, preparing ④ by polycondensation reaction to obtain a gel solution, solidifying and molding ⑤ oil phase, ⑥ washing, drying and screening to obtain the modified urea formaldehyde resin microspheres. Wherein the mass ratio of niobium pentoxide to strontium oxide to lanthanum oxide to magnesium oxide in the sintering aid is 0.5:1:2:2. The preparation method of the modified urea resin microsphere comprises the steps of ① prepar