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CN-122013100-A - HVOF-PVD composite coating and preparation method thereof

CN122013100ACN 122013100 ACN122013100 ACN 122013100ACN-122013100-A

Abstract

The invention belongs to the technical field of high-temperature wear-resistant corrosion-resistant composite coatings, and particularly relates to an HVOF-PVD composite coating and a preparation method thereof. The HVOF-PVD composite coating comprises an HVOF layer and a PVD layer, wherein the HVOF layer comprises a NiCr transition layer and a first working layer, the first working layer comprises NiCr and Cr 3 C 2 , the PVD layer comprises an AlCr transition layer and a second working layer, and the second working layer comprises AlCrN and TiSiN. The design enables the coating to show better comprehensive performance than a single coating under the working conditions of high temperature, corrosion and coupling, including significantly improved wear life, lower friction coefficient, excellent structural stability and corrosion-wear synergy resistance.

Inventors

  • ZHANG DAODA
  • HU BO

Assignees

  • 江西制造职业技术学院(江西省机械科学研究所、江西省机械产品质量监督总站)

Dates

Publication Date
20260512
Application Date
20260211

Claims (10)

  1. 1. The HVOF-PVD composite coating is characterized by comprising an HVOF layer and a PVD layer; the HVOF layer comprises a NiCr transition layer and a first working layer; The first working layer comprises NiCr and Cr 3 C 2 ; The PVD layer comprises an AlCr transition layer and a second working layer; The second working layer comprises AlCrN layers and TiSiN layers which are alternately arranged.
  2. 2. The HVOF-PVD composite coating of claim 1, wherein the NiCr transition layer has a thickness of 40-60 μm; and/or the thickness of the first working layer is 100-200 mu m.
  3. 3. The HVOF-PVD composite coating of claim 1, wherein the mass ratio of NiCr to Cr 3 C 2 in the first working layer is (1:3) - (3:1).
  4. 4. The HVOF-PVD composite coating of claim 1, wherein the PVD layer has a thickness of 2-5 μm.
  5. 5. The HVOF-PVD composite coating of claim 1, wherein the AlCr transition layer has a thickness of 40-60 nm a.
  6. 6. The HVOF-PVD composite coating of claim 1, wherein the AlCrN layer in the second working layer has a thickness of 20-50nm and the tisin layer has a thickness of 20-50nm.
  7. 7. A method of preparing an HVOF-PVD composite coating according to any of claims 1-6, comprising the steps of: Sequentially depositing a NiCr transition layer and a first working layer on the surface of a substrate by supersonic flame spraying, performing surface treatment, adopting PVD to deposit an AlCr transition layer, and sequentially and alternately depositing an AlCrN layer and a TiSiN layer to obtain the HVOF-PVD composite coating; The first working layer comprises NiCr and Cr 3 C 2 in a mass ratio of (1:3) - (3:1).
  8. 8. The method according to claim 7, wherein the parameters of the ultrasonic flame spraying are that the powder feeding rate is 55-60 g/min, the oxygen flow is 1800-2000 LPM, the propylene flow is 5-7 LPM, the air flow is 24-28 LPM, the spraying distance is 300-320 mm, and the moving speed is 480-520 mm/s; And/or the surface treatment includes polishing and ion cleaning.
  9. 9. The method of claim 7, wherein the depositing AlCr transition layer by PVD comprises opening Cr target and Al target to deposit AlCr transition layer with vacuum degree not more than 5.0X10 -3 Pa, ar gas pressure of 1.5-3.0 Pa, DC pulse bias voltage of-50V to-150V, deposition time of 10-20min, and substrate temperature of 300-450 ℃; and/or the AlCrN layer deposition step comprises the steps of adjusting the Ar/N 2 flow ratio to 1:2, entering a reactive sputtering mode, starting an AlCrtarget to deposit the AlCrN layer, wherein the parameters are that the working air pressure is 0.25-0.5 Pa, the direct current pulse bias voltage is-50V to-150V, the matrix temperature is 400-500 ℃, and the deposition time is 120-180 min; And/or the TiSiN layer is deposited by starting a TiSi target in a nitrogen atmosphere, wherein parameters are that pumping is carried out until the pressure is less than 3.0X10 -3 Pa, ar gas is introduced until the pressure is 0.3 Pa, the Ar/N 2 flow ratio is regulated to 1:1, a-100V direct current pulse bias voltage is applied, the power of the intermediate frequency target is set to 5 kW, and the air pressure is maintained between 0.30 and 0.40 Pa.
  10. 10. Use of an HVOF-PVD composite coating according to any of claims 1-6 in wear-resistant and corrosion-resistant surface engineering.

Description

HVOF-PVD composite coating and preparation method thereof Technical Field The invention belongs to the technical field of high-temperature wear-resistant corrosion-resistant composite coatings, and particularly relates to an HVOF-PVD composite coating and a preparation method thereof. Background The NiCr-Cr 3C2 metal ceramic coating prepared by the supersonic flame spraying (HVOF) technology has been attracting attention in the field of high temperature protection because of its excellent high temperature wear resistance and oxidation resistance. The performance of such coatings is highly dependent on optimization of the ratio of NiCr binder phase to Cr 3C2 hard phase, however, the inherent microscopic defects (such as voids, oxide inclusions) and relatively rough surface morphology of HVOF coatings present a significant challenge for their application in corrosive environments. These defects become a rapid path for penetration of corrosive media, and the strong damaging effect of chloride ions on the passivation film can lead to a significant reduction in the corrosion resistance of the coating. The Physical Vapor Deposition (PVD) technology can prepare a multilayer film with compact structure, smooth surface and excellent chemical stability on the surface of a part, and can greatly improve the corrosion resistance of the material. However, the film prepared by PVD technology has limited thickness and insufficient bearing capacity, and is easy to crack and peel under severe abrasion working conditions, so that the film is limited to be singly applied under heavy load. Therefore, how to construct a new generation of high-temperature wear-resistant corrosion-resistant composite coating with long service life and high reliability becomes a key technical problem in the field of surface engineering. Disclosure of Invention The invention aims to provide an HVOF-PVD composite coating and a preparation method thereof, which are used for solving the problems in the prior art. In order to achieve the above object, the present invention provides the following solutions: According to one of the technical schemes, the HVOF-PVD composite coating comprises an HVOF layer and a PVD layer; the HVOF layer comprises a NiCr transition layer and a first working layer; The first working layer comprises NiCr and Cr 3C2; The PVD layer comprises an AlCr transition layer and a second working layer; The second working layer comprises AlCrN layers and TiSiN layers which are alternately arranged. Further, the thickness of the NiCr transition layer is 40-60 μm, preferably 50 μm. Further, the thickness of the first working layer is 100-200 μm, preferably 150 μm. Further, the mass ratio of NiCr to Cr 3C2 in the first working layer is (1:3) - (3:1). Further, the thickness of the PVD layer is 2-5 μm. Further, the thickness of the AlCr transition layer is 40-60 nm a, preferably 50 a nm a. Further, the thickness of the AlCrN layer in the second working layer is 20-50nm, and the thickness of the TiSiN layer is 20-50nm. The thickness ratio of AlCrN layer to TiSiN layer is preferably 1:1. The second technical scheme of the invention is to provide a preparation method of the HVOF-PVD composite coating, which comprises the following steps: sequentially depositing a NiCr transition layer and a first working layer on the surface of a substrate by supersonic flame spraying (HVOF), performing surface treatment, adopting PVD to deposit the AlCr transition layer, and sequentially and alternately depositing an AlCrN layer and a TiSiN layer to obtain the HVOF-PVD composite coating; The first working layer comprises NiCr and Cr 3C2 in a mass ratio of (1:3) - (3:1). Further, the parameters of the supersonic flame spraying (HVOF) are that the powder feeding rate is 55-60 g/min, the oxygen flow is 1800-2000 LPM, the propylene flow is 5-7 LPM, the air flow is 24-28 LPM, the spraying distance is 300-320mm, and the moving speed is 480-520 mm/s. Optionally, the parameters of the supersonic flame spraying (HVOF) are that the powder feeding rate is 55-60 g/min, the oxygen flow is 1900 LPM, the propylene flow is 6 LPM, the air flow is 26 LPM, the spraying distance is 310 mm, and the moving speed is 500 mm/s. Further, the surface treatment includes polishing and ion cleaning. Optionally, the ion cleaning step comprises the steps of vacuumizing, introducing argon, generating Ar + ions through high negative bias glow discharge to bombard the surface, and completing the ion cleaning. Further, the step of depositing the AlCr transition layer by PVD comprises the steps of starting a Cr target and an Al target to deposit the AlCr transition layer, wherein the parameters are that the vacuum degree is less than or equal to 5.0X10 -3 Pa, the Ar gas pressure is 1.5-3.0 Pa, the DC pulse bias is-50V to-150V, the deposition time is 10-20min, and the substrate temperature is 300-450 ℃. Further, the AlCrN layer deposition step comprises the steps of adjusting the flow ratio of Ar/N