Detection and evaluation method for abradability of seal coating

A sealing coating and evaluation method technology, applied in the field of aero-engines, can solve problems such as failure of sealing effect, difficulty in research and performance evaluation, lack of test methods and effective evaluation criteria, etc., to reduce repair rate and improve quality Level of control, the effect of enhancing the assessment of overall performance

Inactive Publication Date: 2018-06-05
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of gas path sealing technology in my country is still in its infancy, and the design, preparation, and application of sealing materials and sealing coatings are mostly in the stage of reference and imitation, especially for service conditions, operating rules, service performance, wear and tear. The understanding of the mechanism is quite insufficient. It is precisely because of the complexity of the structure of the sealing coating itself (matrix, second phase, pore phase), the particularity of the application environment (high speed, variable load, high temperature) and the diversity of wear mechanisms. Wear behavior research and performance evaluation has become a major difficulty, so far there is no standard test method and effective evaluation criteria
[0003] Due to the lack of awareness of the importance of the matching (scratchability, abradability, compatibility) of the sealing coating and the counterpart, and the lack of standards that can comprehensively characterize the coating's scraping performance, this has resulted in engineering practice. , a large number of problems occurred in the gas path sealing pair during the service of the engine, which caused the sealing effect to fail

Method used

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  • Detection and evaluation method for abradability of seal coating
  • Detection and evaluation method for abradability of seal coating

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0107] 1. Preparation of coating samples

[0108] 1) Coating sample size

[0109] The coating sample material is selected from the base material used in actual working conditions. The sample size is 76×40×4mm (length×width×thickness), and a sealing coating with a thickness of 1.5mm to 3.0mm is sprayed on it.

[0110] 2) Surface state of coating sample

[0111] The surface state of the coating sample has an influence on the test results. This effect is usually related to one or more of the following factors:

[0112] —— surface roughness of sample

[0113] - introduction of pollutants

[0114] The following recommendations will minimize the impact of these factors.

[0115] The surface state of the coating sample is quantified by the average roughness, and it is manually ground on each number of sandpaper from coarse to fine. Under various test conditions, the average surface roughness Ra of the coating sample should be less than 5 μm. The thickness of the finished coatin...

Embodiment 1

[0188] In this embodiment, it is used for the detection and evaluation method of the scraping performance of the sealing coating, and the specific steps are as follows:

[0189] Step 1: Degrease the surface of the substrate of the coated test piece, and use acetone or gasoline to wipe the sprayed area of ​​the part to remove oil and debris;

[0190] Step 2: Roughen the surface of the base material of the coating test piece, use a press-in type sand blower, and treat the area to be sprayed with 40 mesh white corundum sand, and the gas pressure is 0.2MPa;

[0191] Step 3: Plasma spray the NiAl bottom layer on the part to be sprayed. The thickness of the NiAl bottom layer is 0.1mm to 0.2mm. The chemical composition of the NiAl coating is 95wt% Ni and 5wt% Al. The specific process parameters are: the particle size of NiAl powder is 50μm ~80μm, hydrogen flow rate 15SCFH, argon flow rate 60SCFH, powder feeding rate 40g / min, spraying distance 110mm;

[0192] Step 4: Plasma spray the...

Embodiment 2

[0198] In this embodiment, it is used for the detection and evaluation method of the scraping performance of the sealing coating, and the specific steps are as follows:

[0199] Step 1: Degrease the surface of the substrate of the coated test piece, and use acetone or gasoline to wipe the sprayed area of ​​the part to remove oil and debris;

[0200] Step 2: Roughen the surface of the base material of the coating test piece, use a press-in type sand blower, and treat the area to be sprayed with 40 mesh white corundum sand, and the gas pressure is 0.2MPa;

[0201] Step 3: Plasma spray the NiAl bottom layer on the part to be sprayed. The thickness of the NiAl bottom layer is 0.1mm to 0.2mm. The chemical composition of the NiAl coating is 95wt% Ni and 5wt% Al. The specific process parameters are: the particle size of NiAl powder is 50μm ~80μm, hydrogen flow rate 15SCFH, argon flow rate 60SCFH, powder feeding rate 40g / min, spraying distance 110mm;

[0202] Step 4: Plasma spray the...

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Abstract

The invention especially relates to a detection and evaluation method for the abradability of a seal coating, belonging to the technical field of aeroengines. The detection and evaluation method is applicable to determination of the abradability of thermally-sprayed abradable seal coatings. The method comprises the following steps: preparation of a coating; measurement and weighing; installation of blade samples; calibration of zero position; setting of test parameters; abrasion testing; and result analysis and evaluation. The detection and evaluation method provided by the invention is employed for studying the frictional wearing behaviors of three low-and-medium-temperature seal coatings, i.e., an AHB (aluminum/boron nitride) coating, a Metco601 (aluminum-silicon polybenzoate) and a Metco 307 (nickel graphite) coating, and matching pairs; and criteria are formulated for determination of the abradability of abradable seal coatings, including three qualitative criteria and four quantitative criteria, wherein the three qualitative criteria are composed of abrading force, the morphology and composition of the surfaces of abrasion scratches, and the morphology and composition of the cross sections of the abrasion scratches, and the four quantitative criteria are composed of a blade height abrasion ratio, a blade coating mass wear ratio, an abrasion scratch length ratio and an adhesion ratio.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and in particular relates to a method for detecting and evaluating the scraping performance of a sealing coating, which is suitable for measuring the scraping performance of a thermal spraying abradable sealing coating. Background technique [0002] High thrust, high efficiency, and low fuel consumption have become the overall goals of engine design and manufacture. In order to improve engine efficiency, prolong service life and reduce fuel consumption, the running gap between the rotor and the stator should be reduced as much as possible, and the air path sealing technology is high performance. One of the key technologies of engine development. At present, the air path seal between the blade and the casing of advanced aero-engines mostly adopts the abradable sealing coating technology. The sealing coating has the advantages of easy manufacture, low investment, low cost, safety and reliabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/58G01N3/56
Inventor 张佳平王璐高禩洋张春刚宋佳
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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