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Coating and repairing methods of medium-low temperature multi-frequency-band compatible coat of engine jet nozzle part

A tail nozzle and engine technology, applied in coatings, devices for applying liquid to surfaces, pre-treatment surfaces, etc., can solve problems such as scratches, scratches, bubbling of coatings, and complex parts structure, and improve service life. and reliability, saving rework costs, and the effect of quick rework

Inactive Publication Date: 2019-02-12
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still various problems in the engineering application of this coating material. For example, if the engine tail nozzle parts are repaired parts, there will be oil stains and different degrees of oxidation on the surface, and the parts have complex structures, mostly welded assemblies, and there are pores. Cracks, if the part matrix is ​​not cleaned thoroughly, it will affect the bonding force of the coating, and the reliability of the coating will have a greater risk; for the actual part production, the optimal process flow and coating curing time are adopted to improve production efficiency; spraying Coated parts will inevitably have scratches, scratches, coating bubbling, peeling and other phenomena during transportation, assembly and use. It can be partially repaired and try not to use the method of completely removing the coating and re-coating. Coating damage state using different repair methods

Method used

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  • Coating and repairing methods of medium-low temperature multi-frequency-band compatible coat of engine jet nozzle part
  • Coating and repairing methods of medium-low temperature multi-frequency-band compatible coat of engine jet nozzle part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A medium-low temperature multi-band compatible coating method for engine tail nozzle parts, the schematic diagram of which is shown in figure 1 , including the following steps:

[0047] Step 1: Pre-processing

[0048] The elastic element of the engine tail nozzle is ultrasonically cleaned with 781 water-based cleaning agent → dried at 80°C → wiped with absolute ethanol → non-sprayed area protection → sand blowing to obtain the pretreated elastic element of the engine tail nozzle; among them, 250 mesh is used for sand blowing Corundum sand, wind pressure is 0.1MPa;

[0049] After observing the initial state of the elastic element of the engine tail nozzle and the surface state after pretreatment, it can be seen that the carbon deposit and oxidation color of the elastic element of the engine tail nozzle have been cleaned after ultrasonic cleaning and sand blowing.

[0050] Step 2: Spraying

[0051] Spray the primer on the elastic element of the engine tail nozzle after...

Embodiment 2

[0055] A method for reworking a low-temperature multi-band compatible coating for engine tail nozzle parts, comprising the following steps:

[0056] The outer regulating plate of the engine tail nozzle has a bulge in the low-temperature multi-frequency band compatible coating as a whole. The external regulating plate of the engine tail nozzle coated with the medium-low temperature multi-frequency band compatible coating is completely removed by heating + sand blowing. The sheet was heated to 350°C with the furnace, kept for 2 hours, then cooled to room temperature with the furnace and taken out, and the coating was removed by blowing sand with 200 mesh corundum sand and wind pressure 0.1MPa, and the entire coating was removed. After the parts were cleaned, the 1 Medium and low temperature multi-band compatible coating method for engine tail nozzle parts Re-spray the bottom layer, middle layer and surface layer.

[0057] In this example, the medium-low temperature multi-band co...

Embodiment 3

[0059] A method for reworking a low-temperature multi-band compatible coating for engine tail nozzle parts, comprising the following steps:

[0060] In this embodiment, the middle layer is partially damaged, and there is an obvious height difference between the locally damaged part of the middle layer and its surroundings, and the original coating needs to be removed to expose the substrate. In this embodiment, the surface layer is removed first, and the undamaged middle layer The layer is shielded and protected to expose the parts to be repaired. The bottom layer and the middle layer are removed by partial sand blasting. The coating method of Example 1 is used to re-spray the new bottom layer and middle layer, and then the surface layer is sprayed after curing.

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Abstract

The invention provides coating and repairing methods of a medium-low temperature multi-frequency-band compatible coat of an engine jet nozzle part and belongs to the field of coating of coats for aero-engines. The coating method comprises the steps that ultrasonic cleaning and drying are conducted on the to-be-treated engine jet nozzle part, organic solvent degreasing is conducted, protection of anon-coat area is conducted, and sand blasting is conducted; spray coating of a primer is conducted, indoor temperature cooling is conducted, spray coating of a middle layer is conducted, the middle layer is cured, protection of the non-coat area is removed, the surface of the middle layer is cleared, secondary protection of the non-coat area is conducted, spray coating of a finishing coat is conducted, the finishing coat is cured, and the product is obtained. The coating and repairing methods of the medium-low temperature multi-frequency-band compatible coat of the engine jet nozzle part meets the demand of an airplane for a medium-low temperature multi-frequency-band compatible coat; for the use and structure features of the engine jet nozzle part, the pretreatment method improves the surface quality of the engine jet nozzle part, and the binding force of the coat is improved beneficially; heating curing is applied to the coat, so that the production period is shortened; for variousdamaged states, probably appearing in the transportation process, the assembly process and the use process, of the coating, corresponding repairing methods are adopted, and therefore the coating and repairing methods have better pertinence.

Description

technical field [0001] The invention relates to the technical field of coating coatings for aero-engines, in particular to a method for coating and repairing low-temperature multi-frequency-band compatible coatings for engine tail nozzle parts. Background technique [0002] In order to meet the needs of the engine and its equipped aircraft for medium and low temperature multi-band compatible coatings, a multi-layer coating system is adopted, which consists of a bottom layer, an intermediate layer and a surface layer. It is sprayed with compressed air. The coating can meet the requirements of tail nozzle parts. Requirements. However, there are still various problems in the engineering application of this coating material. For example, if the engine tail nozzle parts are repaired parts, there will be oil stains and different degrees of oxidation on the surface, and the parts have complex structures, mostly welded assemblies, and there are pores. Cracks, if the part matrix is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D3/02
CPCB05D3/0272B05D5/005
Inventor 梁莹李晗晔刘志强徐琪王璐
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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