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CN-121992397-A - Laser cladding wear-resistant coating for furnace roller surface and preparation method thereof

CN121992397ACN 121992397 ACN121992397 ACN 121992397ACN-121992397-A

Abstract

The invention provides a laser cladding wear-resistant coating for the surface of a furnace roller and a preparation method thereof, belonging to the field of coatings. The preparation method comprises the steps of preheating a pretreated furnace roller substrate to 400-500 ℃, sequentially depositing an undercoat layer, an intermediate coating layer and a surface coating layer on the surface of the furnace roller substrate based on a laser gradient cladding method, performing slow cooling under a protective atmosphere to obtain a composite coating layer, performing strengthening treatment to obtain a wear-resistant coating layer, wherein the undercoat layer comprises first cobalt-based alloy powder and a first strengthening phase, the first strengthening phase is titanium carbide TiC, the intermediate coating layer comprises second cobalt-based alloy powder and a second strengthening phase, the second strengthening phase is hafnium carbide HfC or tantalum carbide TaC, the surface coating layer comprises third cobalt-based alloy powder, a third strengthening phase and an additive, the third strengthening phase comprises hafnium carbide HfC and rare earth oxide, and the additive adopts boron carbide B 4 C. The coating prepared by the invention breaks through the high temperature limit of 1400 ℃, obviously improves the high-temperature hardness and the wear resistance, and solves the problem of thermal stress cracking.

Inventors

  • GAO XUEYOU
  • LI JIAXUN
  • DING HANWEI
  • Gan Jiaquan
  • YANG QIQI

Assignees

  • 江西恒大智造科技有限公司

Dates

Publication Date
20260508
Application Date
20260319

Claims (10)

  1. 1. The preparation method of the laser cladding wear-resistant coating for the surface of the furnace roller is characterized by comprising the following steps of: Preheating the pretreated furnace roller substrate to 400-500 ℃; Sequentially depositing a raw material of a bottom coating, a raw material of an intermediate coating and a raw material of a surface coating on the surface of a furnace roller substrate based on a laser gradient cladding method, and performing slow cooling under a protective atmosphere to obtain a composite coating; carrying out strengthening treatment on the composite coating to obtain a wear-resistant coating; The raw materials of the bottom coating comprise first cobalt-based alloy powder and a first strengthening phase, wherein the first strengthening phase is titanium carbide TiC; The raw materials of the intermediate coating comprise second cobalt-based alloy powder and a second strengthening phase, wherein the second strengthening phase is hafnium carbide HfC or tantalum carbide TaC; The raw materials of the surface coating comprise third cobalt-based alloy powder, a third strengthening phase and an additive, wherein the third strengthening phase comprises hafnium carbide HfC and rare earth oxide, the rare earth oxide is selected from yttrium oxide Y 2 O 3 or lanthanum oxide La 2 O 3 , and the additive adopts boron carbide B 4 C.
  2. 2. The preparation method of the laser cladding wear-resistant coating for the surface of the furnace roller, which is disclosed in claim 1, is characterized in that the first cobalt-based alloy powder comprises the following elements, by weight, 0.05% -0.15% of C, 25% -35% of Ni, 20% -25% of Cr, 13% -16% of W and the balance Co, and the dosage of the first strengthening phase is 8% -12% of the first cobalt-based alloy powder.
  3. 3. The preparation method of the laser cladding wear-resistant coating for the surface of the furnace roller, which is disclosed in claim 1, is characterized in that the second cobalt-based alloy powder comprises the following elements, by weight, 0.05% -0.15% of C, 20% -30% of Ni, 20% -25% of Cr, 18% -22% of W, 5% -8% of Mo, 2% -5% of Al and the balance Co, and the second strengthening phase is 13% -17% of the second cobalt-based alloy powder.
  4. 4. The preparation method of the laser cladding wear-resistant coating for the surface of the furnace roller, which is characterized in that the third cobalt-based alloy powder comprises the following elements, by weight, 0.05% -0.15% of C, 18% -24% of Ni, 18% -22% of Cr, 18% -24% of W, 6% -10% of Mo, 3% -7% of Al, 0.3% -0.6% of Y and the balance Co, the dosages of hafnium carbide HfC and rare earth oxide in the third strengthening phase are respectively 18% -22% and 5% -8% of the third cobalt-based alloy powder, and the dosage of the additive is 2% -4% of the third cobalt-based alloy powder.
  5. 5. The method for preparing the laser cladding wear-resistant coating for the surface of the furnace roller according to claim 1, wherein the step of the laser gradient cladding method specifically comprises the following steps: Depositing the raw materials of the bottom coating on the surface of a furnace roller matrix by adopting laser cladding, and cooling to below 200 ℃ to form the bottom coating; Depositing the raw material of the intermediate coating on the bottom coating by adopting laser cladding, and cooling to below 200 ℃ to form the intermediate coating; Depositing the raw materials of the surface coating on the intermediate coating by adopting laser cladding to form a surface coating; transferring into a preheated argon protection furnace, and cooling to room temperature at the temperature of less than or equal to 50 ℃ per hour to form a composite coating; When the intermediate coating and the surface coating are prepared by the laser gradient cladding method, the laser power is 4000-4500W, and rectangular light spots are adopted.
  6. 6. The method for producing a laser cladding wear resistant coating for a furnace roller surface according to claim 1, wherein the strengthening treatment comprises laser shock strengthening and ultrasonic rolling.
  7. 7. The method for preparing the laser cladding wear-resistant coating for the surface of the furnace roller according to claim 6, wherein the laser shock strengthening conditions comprise pulse energy=5J-10J, light spots=1 mm-5 mm, overlap ratio=40% -60%, and shock times=2 times-5 times.
  8. 8. The preparation method of the laser cladding wear-resistant coating for the surface of the furnace roller, which is characterized in that the ultrasonic rolling condition comprises ultrasonic frequency=15 kHz-25 kHz, static pressure 300-500N, rolling times=2-5 times, feeding speed=0.05 mm/r-0.15 mm/r, and surface roughness Ra of the ultrasonic rolled surface is less than or equal to 0.2 mu m.
  9. 9. The method for producing a laser cladding wear-resistant coating for a furnace roller surface according to claim 6, wherein the strengthening treatment further comprises surface machining by which the surface roughness Ra is made to be 3.2 μm or less before laser shock peening.
  10. 10. A laser cladding wear-resistant coating produced by the method for producing a laser cladding wear-resistant coating for a furnace roller surface as claimed in any one of claims 1 to 9.

Description

Laser cladding wear-resistant coating for furnace roller surface and preparation method thereof Technical Field The invention belongs to the technical field of coatings, and particularly relates to a laser cladding wear-resistant coating for a furnace roller surface and a preparation method thereof. Background The roller bed roller of high temperature furnace, usually simply called furnace roller or heating furnace roller, is installed inside continuous industrial heating furnace (such as annealing furnace, quenching furnace, steel rolling heating furnace, glass kiln, etc.), and is used for bearing and conveying the rotating parts of the processed workpiece in high temperature environment, and is a rigid and high temperature resistant roller. The working environment of the furnace roller is extremely severe (typically 800 ℃ to 1000 ℃ and even higher), so that the surface thereof needs to be specially treated to resist high temperature and maintain high temperature strength and wear resistance. Wherein, the coating is one of the surface treatment methods with wider application and reliable performance. The cobalt-based alloy system coating is a representative furnace roller surface coating due to the advantages of excellent high temperature performance, high temperature oxidation resistance, hot corrosion resistance, good thermal fatigue resistance and the like. However, with the development of industrial manufacturing, it is necessary to perform the manufacturing in an environment of higher temperature (e.g., 1400 ℃ or higher) when manufacturing some special material products. The research shows that the wear-resistant life of the coating is obviously shortened in the environment of about 1400 ℃. Disclosure of Invention In view of the above, the invention provides a laser cladding wear-resistant coating for a furnace roller surface and a preparation method thereof, which aim to solve at least one technical problem in the background art. The invention is realized in the following way: The invention provides a preparation method of a laser cladding wear-resistant coating for the surface of a furnace roller, which comprises the following steps: Preheating the pretreated furnace roller substrate to 400-500 ℃; Sequentially depositing a raw material of a bottom coating, a raw material of an intermediate coating and a raw material of a surface coating on the surface of a furnace roller substrate based on a laser gradient cladding method, and performing slow cooling under a protective atmosphere to obtain a composite coating; carrying out strengthening treatment on the composite coating to obtain a wear-resistant coating; The raw materials of the bottom coating comprise first cobalt-based alloy powder and a first strengthening phase, wherein the first strengthening phase is titanium carbide TiC; The raw materials of the intermediate coating comprise second cobalt-based alloy powder and a second strengthening phase, wherein the second strengthening phase is hafnium carbide HfC or tantalum carbide TaC; The raw materials of the surface coating comprise third cobalt-based alloy powder, a third strengthening phase and an additive, wherein the third strengthening phase comprises hafnium carbide HfC and rare earth oxide, the rare earth oxide is selected from yttrium oxide Y 2O3 or lanthanum oxide La 2O3, and the additive adopts boron carbide B 4 C. Further, the first cobalt-based alloy powder comprises the following elements, by weight, 0.05% -0.15% of C, 25% -35% of Ni, 20% -25% of Cr, 13% -16% of W and the balance Co, wherein the consumption of the first reinforcing phase is 8% -12% of that of the first cobalt-based alloy powder. Further, the second cobalt-based alloy powder comprises, by weight, 0.05% -0.15% of C, 20% -30% of Ni, 20% -25% of Cr, 18% -22% of W, 5% -8% of Mo, 2% -5% of Al and the balance Co, wherein the second reinforcing phase is used in an amount of 13% -17% of the second cobalt-based alloy powder. Further, the third cobalt-based alloy powder comprises, by weight, 0.05% -0.15% of C, 18% -24% of Ni, 18% -22% of Cr, 18% -24% of W, 6% -10% of Mo, 3% -7% of Al, 0.3% -0.6% of Y and the balance Co, wherein the dosages of hafnium carbide HfC and rare earth oxide in the third strengthening phase are respectively 18% -22% and 5% -8% of the third cobalt-based alloy powder, and the dosage of the additive is 2% -4% of the third cobalt-based alloy powder. Further, the step of the laser gradient cladding method specifically comprises the following steps: Depositing the raw materials of the bottom coating on the surface of a furnace roller matrix by adopting laser cladding, and cooling to below 200 ℃ to form the bottom coating; Depositing the raw material of the intermediate coating on the bottom coating by adopting laser cladding, and cooling to below 200 ℃ to form the intermediate coating; Depositing the raw materials of the surface coating on the intermediate coating by adopting laser cladding to form a surface co