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Flame spraying construction method for micro-melting ceramic coating

A ceramic coating and flame spraying technology, which is applied in metal material coating process, coating, fusion spraying, etc., can solve the problems of short crack initiation life, easy falling off of additive materials, poor effect, etc., and achieve long initiation life , Raw materials are simple and easy to obtain, the overall strength and crack resistance are good

Active Publication Date: 2021-05-11
湖北超卓航空技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing repair technology is not effective for the repair of landing gear, and there are problems such as short crack initiation life and easy falling off of additive materials.

Method used

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  • Flame spraying construction method for micro-melting ceramic coating
  • Flame spraying construction method for micro-melting ceramic coating
  • Flame spraying construction method for micro-melting ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Step 1) Pretreatment: Scrub the cracked parts of the landing gear with 75% alcohol, then air-dry to remove surface impurities;

[0059] Step 2) Spraying and repairing the base material: use supersonic flame spraying equipment to spray a layer of 3mm aluminum alloy powder with the same material as the landing gear on the surface of the cracked part of the landing gear after step 1), and use the pressure of oxygen, propane and nitrogen respectively 0.65 ~ 0.85MPa, 0.50 ~ 0.65MPa and 0.85 ~ 1.05MPa, oxygen flow rate of 220 ~ 240L / min spray parameters, aluminum alloy powder particle size is controlled at 25 ~ 50μm;

[0060] Step 3) Spray micro-fused ceramics: use supersonic flame spraying equipment to spray a layer of 2 mm micro-fused ceramic powder on the surface of the cracked part of the landing gear after step 2), and use oxygen, propane and nitrogen at a pressure of 0.45 to 0.65 MPa respectively , 0.30~0.45MPa and 0.50~0.70MPa, oxygen flow rate of 180~200L / min spraying...

Embodiment 2

[0064] Step 1) Pretreatment: Scrub the cracked parts of the landing gear with 75% alcohol, then air-dry to remove surface impurities;

[0065] Step 2) Spraying and repairing the base material: use supersonic flame spraying equipment to spray a layer of 2mm aluminum alloy powder with the same material as the landing gear on the surface of the cracked part of the landing gear after step 1), and use the pressure of oxygen, propane and nitrogen respectively 0.65 ~ 0.85MPa, 0.50 ~ 0.65MPa and 0.85 ~ 1.05MPa, oxygen flow rate of 220 ~ 240L / min spray parameters, aluminum alloy powder particle size is controlled at 5 ~ 25μm;

[0066] Step 3) Spray micro-fused ceramics: use supersonic flame spraying equipment to spray a layer of 1mm micro-fused ceramic powder on the surface of the cracked part of the landing gear after step 2), using oxygen, propane and nitrogen at a pressure of 0.45 to 0.65 MPa, 0.30-0.45MPa and 0.50-0.70MPa, oxygen flow rate of 180-200L / min spraying parameters, spray...

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Abstract

The invention relates to a flame spraying construction method for a micro-melting ceramic coating. The flame spraying construction method comprises the following steps: 1, pretreatment: cleaning a crack part of an undercarriage to remove surface impurities; (2) spraying a repairing base material: spraying a layer of aluminum alloy powder which is the same as the undercarriage in material on the surface of the crack part of the undercarriage treated in the step (1) by using high velocity oxy-fuel spraying equipment; (3) spraying micro-fused ceramic: spraying micro-melting ceramic powder on the surface of the crack part of the undercarriage treated in the step (2) by using high velocity oxy-fuel spraying equipment; (4) deposition repairing: repeating the spraying operation in the step (2) and the spraying operation in the step (3) for 2-4 times, and then carrying out the operation in the step (2) again; and (5) follow-up treatment: polishing the spraying repairing part of the repaired undercarriage obtained in the step (4) to finish repairing. Fatigue cracks on the surface of an undercarriage assembly can be effectively repaired, the repaired additive is not prone to falling off, and the crack initiation life is long.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a flame spraying construction method of a slightly fused ceramic coating. Background technique [0002] Landing gear is an accessory device used to support the aircraft and move on the ground (water surface) when the lower part of the aircraft is used for take-off and landing or ground (water surface) taxiing. Landing gear is an important load-bearing and manoeuvrable part of an aircraft, which plays an extremely important role in the safe take-off and landing of the aircraft. Landing gear is a necessary support system for aircraft takeoff, landing, taxiing, ground movement and parking. It is one of the main components of the aircraft, and its performance is directly related to the use and safety of the aircraft. [0003] Modern aircraft are getting bigger and heavier, and their payloads are constantly increasing. For example, the Boeing 747-8 passenger plane pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/06C23C4/11
CPCC23C4/129C23C4/06C23C4/11
Inventor 李羿含张清贵徐建高植强黄成进
Owner 湖北超卓航空技术有限公司