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CN-122013173-A - Wind power main shaft and method for prolonging service life of wind power main shaft

CN122013173ACN 122013173 ACN122013173 ACN 122013173ACN-122013173-A

Abstract

The invention discloses a wind power main shaft and a method for prolonging service life of the wind power main shaft, and belongs to the technical field of wind power main shafts. The method comprises the steps of preparing a nanocrystalline transition layer on the surface of a wind power main shaft matrix, preparing a composite working layer on the surface of the nanocrystalline transition layer, and carrying out post-treatment on the composite working layer, wherein the composite working layer comprises an inner layer, an intermediate layer and an outer layer, 5% -15% of nanoscale hard ceramic particles are dispersed in a bonding phase of the inner layer, 20% -35% of nanoscale hard ceramic particles and 1% -5% of nanoscale solid lubricant particles are dispersed in a bonding phase of the intermediate layer, and 15% -25% of nanoscale hard ceramic particles and 3% -8% of nanoscale solid lubricant particles are dispersed in a bonding phase of the outer layer. The method can ensure that the wind power main shaft has high bonding strength, reasonable stress distribution, better anti-fatigue, wear-resisting and corrosion-resisting performances, and improves the service life and reliability of key parts of the wind power main shaft.

Inventors

  • GAN CHUNLEI
  • ZHOU NAN
  • JIN WEI
  • ZHENG KAIHONG
  • FU SHANSHAN
  • YANG LI
  • TAN WEI

Assignees

  • 广东省科学院新材料研究所

Dates

Publication Date
20260512
Application Date
20260213

Claims (10)

  1. 1. A method for prolonging service life of a wind power main shaft is characterized by comprising the following steps of preparing a nanocrystalline transition layer made of Fe-based or Ni-based alloy on the surface of a wind power main shaft matrix, preparing a composite working layer on the surface of the nanocrystalline transition layer, and performing post-treatment on the composite working layer to form a compact nanocrystalline nitride layer on the surface of the composite working layer; Wherein the composite working layer comprises an inner layer, an intermediate layer and an outer layer; the inner layer takes Fe-based or Ni-based alloy as a binding phase, and 5% -15% of nano-scale hard ceramic particles are dispersed in the binding phase of the inner layer in percentage by volume; The intermediate layer takes Fe-based or Ni-based alloy as a binding phase, and 20% -35% of nano-scale hard ceramic particles and 1% -5% of nano-scale solid lubricant particles are dispersed in the binding phase of the intermediate layer in percentage by volume; The outer layer takes Fe-based or Ni-based alloy as a binding phase, and 15% -25% of nanoscale hard ceramic particles and 3% -8% of nanoscale solid lubricant particles are dispersed in the binding phase of the outer layer in percentage by volume.
  2. 2. The method according to claim 1, wherein before the nanocrystalline transition layer is prepared, roughening and cleaning treatment are performed on a region to be strengthened on the surface of the wind power main shaft substrate; preferably, the roughening and cleaning treatment comprises the steps of firstly performing sand blasting roughening and then performing alcohol ultrasonic cleaning.
  3. 3. The method of claim 1, wherein the nanocrystalline transition layer is prepared by high-speed laser cladding; The scanning speed of high-speed laser cladding is 10-50 mm/s, the laser power is 2-4 kW, and the preparation raw materials of the nanocrystalline transition layer comprise Fe-based or Ni-based self-fluxing alloy powder.
  4. 4. A method according to any one of claims 1 to 3, wherein the nanocrystalline transition layer has at least one of the following features: The method is characterized in that the thickness of the nanocrystalline transition layer is 50-150 mu m; the grain size of the nanocrystalline transition layer is 100 nm-500 nm; and 3, the nanocrystalline transition layer and the matrix are metallurgically bonded.
  5. 5. The method of claim 1, wherein the composite working layer is prepared by coaxial powder feeding type laser cladding; the preparation raw materials of the inner layer comprise Fe-based or Ni-based self-fluxing alloy powder and nanoscale hard ceramic particles, wherein the preparation conditions of the inner layer comprise 1-3 kW of laser power and 10-50 mm/s of scanning speed; the preparation raw materials of the intermediate layer comprise Fe-based or Ni-based self-fluxing alloy powder, nanoscale hard ceramic particles and nanoscale solid lubricant particles, wherein the preparation conditions of the intermediate layer comprise 1-3 kW of laser power and 10-50 mm/s of scanning speed; The preparation raw materials of the outer layer comprise Fe-based or Ni-based self-fluxing alloy powder, nanoscale hard ceramic particles and nanoscale solid lubricant particles, and the preparation conditions of the outer layer comprise laser power of 1 kW-3 kW and scanning speed of 10 mm/s-50 mm/s.
  6. 6. The method of claim 1 or 5, wherein the composite working layer has at least one of the following characteristics: The characteristic 4 is that the nano-scale hard ceramic particles comprise at least one of tungsten carbide, titanium carbide and aluminum oxide; the characteristic 5 is that the particle size of the nano-scale hard ceramic particles is 50 nm-250 nm; feature 6. The nanoscale solid lubricant particles comprise at least one of hexagonal boron nitride and graphene; the total thickness of the composite working layer is 300-700 mu m; the thickness of the inner layer is 150-300 mu m; The thickness of the intermediate layer is 100-250 mu m; The characteristic 10 is that the thickness of the outer layer is 50-150 mu m.
  7. 7. The method of claim 1, wherein forming a dense nanocrystalline nitrided layer comprises laser remelting scanning a surface of the composite working layer with nitrogen protection to form a dense nanocrystalline nitrided layer; The laser remelting condition comprises that the laser power is 1 kW-3 kW, the scanning speed is 10 mm/s-20 mm/s, and the spot diameter is 1 mm-5 mm.
  8. 8. The method of claim 1, further comprising subjecting the composite working layer and the nitride layer together forming a strengthening layer to a hot isostatic pressing process; Preferably, the hot isostatic pressing treatment is performed for 3-5 hours at 1000-1100 ℃.
  9. 9. A wind power main shaft, characterized in that it is prepared by the method of any one of claims 1-8.
  10. 10. A wind power spindle according to claim 9, characterized in that the wind power spindle has at least one of the following features: The characteristic 11 is that the bonding strength between the strengthening layer in the wind power main shaft and the matrix is more than or equal to 405MPa; The characteristic 12 is that the surface hardness of the wind power main shaft is more than or equal to 800HV 0.2 ; and 13, the corrosion resistance time of the wind power main shaft in a neutral salt spray test is more than or equal to 520h.

Description

Wind power main shaft and method for prolonging service life of wind power main shaft Technical Field The invention relates to the technical field of wind power spindles, in particular to a wind power spindle and a method for prolonging service life of the wind power spindle. Background The wind power main shaft is used as a core transmission component of the wind power generator set, and is subjected to huge alternating bending and torsion loads and environmental corrosion such as wind sand, wet salt fog and the like for a long time, and key areas such as bearing positions and sealing positions of the wind power main shaft are easy to wear, fretting fatigue and corrosion damage, so that equipment is stopped, and the maintenance cost is extremely high. In the prior art, the strengthening is usually carried out by adopting a surface quenching method, a thermal spraying method (such as high-speed oxygen fuel spraying tungsten carbide coating) method, a chromeplating method and the like. However, these conventional techniques have disadvantages in that the hardness gradient of the surface hardening layer is steep, stress concentration is easily generated at the interface, the thermal spray coating has a high porosity, the mechanical bonding is mainly combined with the substrate, the chromium coating is easily peeled off under heavy impact, and the chromium coating has microcracks and the environmental protection pressure is increasingly increased. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a wind power main shaft and a method for prolonging service life of the wind power main shaft so as to solve or improve the technical problems. The invention can be realized as follows: in a first aspect, the invention provides a method for prolonging service life of a wind power main shaft, comprising the following steps of preparing a nanocrystalline transition layer made of Fe-based or Ni-based alloy on the surface of a wind power main shaft matrix, preparing a composite working layer on the surface of the nanocrystalline transition layer, and performing post-treatment on the composite working layer to form a compact nanocrystalline nitriding layer on the surface of the composite working layer; the composite working layer comprises an inner layer, an intermediate layer and an outer layer; The inner layer takes Fe-based or Ni-based alloy as a binding phase, and 5% -15% of nano-scale hard ceramic particles are dispersed in the binding phase of the inner layer in percentage by volume; The middle layer takes Fe-based or Ni-based alloy as a binding phase, and 20% -35% of nano-scale hard ceramic particles and 1% -5% of nano-scale solid lubricant particles are dispersed in the binding phase of the middle layer in percentage by volume; The outer layer takes Fe-based or Ni-based alloy as a binding phase, and 15% -25% of nanoscale hard ceramic particles and 3% -8% of nanoscale solid lubricant particles are dispersed in the binding phase of the outer layer in percentage by volume. In an alternative embodiment, before the nanocrystalline transition layer is prepared, roughening and cleaning treatment are carried out on the area to be strengthened of the surface of the wind power main shaft matrix. In an alternative embodiment, the roughening and cleaning treatment comprises sand blasting, roughening, and then ultrasonic cleaning with alcohol. In an alternative embodiment, a high-speed laser cladding mode is adopted to prepare the nanocrystalline transition layer; the scanning speed of high-speed laser cladding is 10-50 mm/s, the laser power is 2-4 kW, and the preparation raw materials of the nanocrystalline transition layer comprise Fe-based or Ni-based self-fluxing alloy powder. In an alternative embodiment, the nanocrystalline transition layer has at least one of the following features: The method is characterized in that the thickness of the nanocrystalline transition layer is 50-150 mu m; The characteristic 2 is that the grain size of the nanocrystalline transition layer is 100 nm-500 nm; And 3, the nanocrystalline transition layer and the matrix are metallurgically bonded. In an alternative embodiment, a coaxial powder feeding type laser cladding mode is adopted to prepare a composite working layer; the preparation raw materials of the inner layer comprise Fe-based or Ni-based self-fluxing alloy powder and nanoscale hard ceramic particles, wherein the preparation conditions of the inner layer comprise 1-3 kW of laser power and 10-50 mm/s of scanning speed; The preparation raw materials of the intermediate layer comprise Fe-based or Ni-based self-fluxing alloy powder, nanoscale hard ceramic particles and nanoscale solid lubricant particles, wherein the preparation conditions of the intermediate layer comprise 1-3 kW of laser power and 10-50 mm/s of scanning speed; The preparation raw materials of the outer layer comprise Fe-based or Ni-based self-fluxing alloy powde