Preparation method of tungsten carbide coating layer sprayed on surface of aluminum base material through explosion

A technology of explosive spraying and aluminum base material, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems of the annealing mechanical properties of the base material, the disappearance of residual compressive stress, and the poor bonding strength of the coating, etc., to achieve Improved fatigue life, high hardness and bonding strength, and reduced overheating

Inactive Publication Date: 2014-12-17
KING STRONG MATERIAL ENG LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flying speed of the sprayed material particles is low, resulting in insufficient flattening of the particles, the internal porosity of the coating is generally as high as 3-10%, and the coating bonding strength is poor; the high temperature of the spraying process will easily cause the annealing of the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1:

[0017] The workpiece base material is in-situ self-generated TiB that can be used for the hub splint of the helicopter rotor system 2 For the particle-reinforced aluminum substrate, the aluminum substrate workpiece is ultrasonically cleaned with acetone for 10 minutes to remove grease before spraying, and then shot peened with a cast steel ball with a diameter of 1 mm at a shot peening pressure of 0.4 MPa and a time of 30 minutes. To increase the surface roughness of the material, increase the residual compressive stress on the surface of the aluminum substrate and the bonding strength between the coating and the substrate.

[0018] Spraying process: before each explosion, first deliver a combustible mixture of oxygen, acetylene and propane gas into the explosion chamber; then the atomized WC-10Co4Cr powder is delivered by the powder feeder; it is ignited by a spark plug to make it burn rapidly and explode. A high-temperature and high-speed gas flow is formed; t...

Example Embodiment

[0025] Example 2:

[0026] The workpiece base material is in-situ self-generated TiB that can be used for the hub splint of the helicopter rotor system 2 For particle-reinforced aluminum-based composites, the composite workpiece is ultrasonically cleaned with acetone for 10 minutes to remove grease before spraying, and then shot peened with cast steel balls with a diameter of 1 mm at a shot peening pressure of 0.4 MPa and a time of 30 minutes. The explosive spraying process and the sealing process are the same as in Example 1, the explosive spraying process parameters are shown in Table 3, and the properties of the coating and the hub splint are shown in Table 4.

[0027] Table 3 Explosive spraying process parameters

[0028] Explosion frequency

[0029] Table 4 Performance of coating and hub splint

[0030] Hardness HV 0.3

Example Embodiment

[0031] Example 3:

[0032] The substrate is in-situ TiB 2 For particle-reinforced aluminum-based composites, the composite workpiece is ultrasonically cleaned with acetone for 10 minutes to remove grease before spraying, and then shot peened with cast steel balls with a diameter of 1 mm at a shot peening pressure of 0.4 MPa and a time of 30 minutes. The explosive spraying process and the sealing process are the same as in Example 1, the explosive spraying process parameters are shown in Table 5, and the performance of the coating and the hub splint are shown in Table 6.

[0033] Table 5 Explosive spraying process parameters

[0034] Explosion frequency

[0035] Table 6 Performance of coating and hub splint

[0036] Hardness HV 0.3

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Abstract

The invention discloses a preparation method of a tungsten carbide coating layer sprayed on a surface of an aluminum base material through explosion. The preparation method comprises the following steps: (1) the surface of an in-situ synthesis TiB2 particle-reinforced aluminum base material is pretreated by adopting an oil removing and shot blasting process; (2) a wear resisting and corrosion resisting WC-10Co4Cr coating layer is prepared on the surface of the in-situ synthesis TiB2 particle-reinforced aluminum base material by adopting a pulse explosion spraying method; and the temperature of the aluminum base material is controlled within 60-120 DEG C; (3) after the spraying is finished, the coating layer is grinded and finished by adopting a diamond grinding wheel; and (4) the coating layer is closed by adopting epoxy resin sealant. The method can prepare the coating layer on the surface of a composite material of a propeller hub plywood of a connecting piece of a helicopter rotor system so as to improve the corrosion resistance of the surface of the TiB2 particle-reinforced aluminum base composite material, and can effectively prevent the invalidation caused by fretting wear and surface scratching so as to prolong the fatigue fracture resisting service life of the material above 3 times.

Description

technical field [0001] The invention relates to a preparation method of a surface coating, in particular to a preparation method of an explosively sprayed tungsten carbide coating which can be used on the surface of an aluminum-based composite material such as a rotor hub splint of a helicopter rotor system and has both wear-resistant and anti-corrosion functions. Background technique [0002] Wear is one of the three main forms of material failure, and equipment failure is often caused by the failure of individual parts. The propeller hub splint of the helicopter rotor system has high requirements on the surface properties of the material, especially under the conditions of high speed and heavy load, the local wear of the surface will cause the failure of the parts and reduce the reliability of the equipment. Introduction of TiB by in situ autogenesis 2 The particle-reinforced phase greatly improves the mechanical properties of aluminum alloy and replaces the powder metall...

Claims

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Application Information

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IPC IPC(8): C23C4/04C23C4/12C23C4/06C23C4/126
Inventor 赵立英王刚刘平安吴清军
Owner KING STRONG MATERIAL ENG LTD
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