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Composite surface reinforcing repair method for abrasion of aviation aluminum alloy shaft

A repair method and composite surface technology, applied in the direction of pressure inorganic powder coating, anodic oxidation, etc., can solve the problems of non-wear resistance and low coating hardness, and achieve the effect of high wear resistance and low porosity

Pending Publication Date: 2020-11-20
PLA NO 5719 FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness of the cold sprayed pure aluminum coating is lower than that of the aluminum alloy substrate, and it is not wear-resistant.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0021] A method for repairing the surface of an aviation-used aluminum alloy shaft with enhanced surface enhancement, the technical solution consists of the following components:

[0022] 1) Turning the outer circle: Carry out turning processing on the worn outer circle to eliminate eccentricity, and the maximum removal thickness is ≤2mm. Processing surface roughness Ra≤1.6;

[0023] 2) Use ultra-high-speed cold spraying technology to spray pure aluminum powder on the processed surface: use 360-mesh aluminum powder with a purity ≥ 99.9%, protect the non-spraying area with copper skin, and the coating thickness on one side is 0.5mm-2mm, and the visual axis is worn Depends on the quantity, reserve a machining allowance of more than 0.2mm, and the temperature of the shaft does not exceed 120°C during the entire spraying process;

[0024] 3) Turning the outer circle: machine the shaft to the original size before wear, and the roughness is ≤0.8μm;

[0025] 4) Surface hard anodiza...

Embodiment 1

[0028] The adjustable blade of a certain type of aero-engine compressor is made of 2A70 aluminum alloy, the diameter of the upper fixed shaft is 10mm, the length is 15mm, the local wear depth is 0.3-1.0mm, and the pattern requires that the circumferential runout is ≤5μm.

[0029] Firstly, lathing is used to remove the local wear of the outer circle. According to the diameter of the shaft after turning, the thickness of the coating to be sprayed is calculated. After the non-spraying area of ​​the blade is protected by a fixture, the ultra-high-speed cold spraying of pure aluminum powder is used for the outer shaft. The diameter size is restored, and a certain machining allowance is reserved; turning until the diameter of the outer circle is 0.1mm to 0.2mm smaller than the design size, and then the shaft is hard anodized; finally, the outer diameter of the shaft is ground to the design size, and the surface is rough Degree≤0.4μm. The repaired adjustable blades are installed toge...

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Abstract

The invention discloses a composite surface reinforcing repair method, particularly discloses a composite surface reinforcing repair method for abrasion of an aviation aluminum alloy shaft, and belongs to the technical field of aero-engine repair and maintenance processes. For the composite surface reinforcing repair method for abrasion of the aviation aluminum alloy shaft, the deformation is small in the repair process, the porosity of a repair layer is low, and the abrasion resistance is remarkably enhanced after repair. According to the composite surface reinforcing repair method, first, aluminum powder with the particle size not larger than 360 meshes and the purity larger than or equal to 99.9% serves as a raw material, by adopting a cold spraying process, coating powder impacts the surface of a base body at a high speed in a completely solid state through supersonic gas and solid gas flows at the normal temperature or the low temperature, strong plastic deformation occurs, shearing jet flow is locally generated, so that a composite coating which is low in porosity, relatively high in bonding strength and in a compressive stress state is formed through depositing, and then surface hard anodizing treatment is carried out on the composite coating to obtain the reinforced composite modified surface of the worn aluminum alloy shaft.

Description

technical field [0001] The invention relates to a composite surface reinforcement repair method, in particular to a composite surface reinforcement repair method for wear of an aviation aluminum alloy shaft, and belongs to the technical field of aero-engine repair and maintenance technology. Background technique [0002] In order to reduce the weight, some parts of the aero-engine are made of aluminum alloy. During the rotation or fretting operation, the shaft aluminum alloy is prone to wear and tear failure, and the depth is within 1mm. The existing traditional surfacing technology, although the surfacing material and the substrate can achieve a firm metallurgical bond, but the high welding temperature far exceeds the melting point of the base metal, and the large heat input will easily cause serious deformation of the product and cannot be used; while the traditional plasma thermal spraying Although it has little effect on the temperature of the base material and will not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04C25D11/04
CPCC23C24/04C25D11/04
Inventor 陈海生黄一雄郭双全赵云强张川
Owner PLA NO 5719 FACTORY
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