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Method for testing and evaluating abradability of sealing coating

A test method and coating technology, which is applied in the direction of testing wear resistance, measuring devices, instruments, etc., can solve the problems of inability to accurately quantify, normalize horizontal comparison, etc.

Active Publication Date: 2020-10-30
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is a method for simulating high-speed working conditions of aero-engines in the laboratory, which can perform high-speed impact grinding on sealing coatings and blades, but how to conduct impact grinding tests? Characterization of the final coating to accurately evaluate its abradability remains a challenge
Existing characterization methods, such as coating wear scar morphology analysis method, wear weight method, wear volume method and microstructure morphology analysis method, have problems such as inaccurate quantification, normalization processing, and horizontal comparison.

Method used

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  • Method for testing and evaluating abradability of sealing coating
  • Method for testing and evaluating abradability of sealing coating
  • Method for testing and evaluating abradability of sealing coating

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0066] (1) Take the aluminum silicon polyphenyl ester abradable coating sample (57.2wt% of Al content in the coating, 7.8wt% of Si content, 35wt% of polyphenyl ester content) prepared by plasma spraying process, coating thickness 2mm, arc The radius of curvature of the abradable coating (R 2 ) is 1835mm, and the arc length of the arc-shaped abradable coating is 68mm.

[0067] (2) Take the TC4 titanium alloy simulation blade, the blade tip thickness × width size is 0.7mm × 20mm, before the impact test, use the TA025A spiral micrometer to measure the blade width from left, middle and right respectively. The blade heights were measured at the sampling points, and 20.104mm, 20.103mm, and 20.103mm were measured respectively, and the average blade height (h 1 ) is 20.103mm.

[0068] (3) Using the BGRIMM-AST1000 high-speed abradable testing machine developed by Mining and Metallurgy Technology Group Co., Ltd., install the arc-shaped abradable coating in steps (1) and (2) on the int...

Embodiment 2

[0076] (1) get the Al-12Si-polyphenyl ester arc-shaped abradable coating (same as embodiment 1) prepared by plasma spraying process, coating thickness 2mm, substrate thickness 6mm, the radius of curvature of the arc-shaped abradable coating (R 2 ) is 1835mm, and the arc length of the arc-shaped abradable coating is 68mm.

[0077] (2) Take the TC4 titanium alloy simulation blade, the blade tip thickness × width size is 0.7mm × 20mm, before the impact test, use the TA025A spiral micrometer to measure the blade width from left, middle and right respectively. Sampling points were used to measure the height of blades, which were measured as 20.133mm, 20.115mm, and 20.109mm respectively, and the average value of blade height (h 1 ) is 20.132mm.

[0078] (3) Install the arc-shaped abradable coating and simulated blade in step (1) and step (2) on the BGRIMM-AST1000 high-speed abradable testing machine developed by Mining and Metallurgy Technology Group Co., Ltd., after installing the...

Embodiment 3

[0089] Calculation of Invasion Depth Ratio. The penetration depth ratio was calculated according to the following formula.

[0090] when h 2 1 ,

[0091] when h 2 >h 1 ,

[0092] For Example 1, because the height of the blade after the bump test has decreased by 0.109mm, the penetration depth is the sum of the wear scar depth and the blade wear height, which is 0.585mm; the penetration depth ratio=blade height change value divided by the penetration depth, Then the penetration depth ratio is 18.6%.

[0093] For embodiment 2, because the blade height increased by 0.033mm after the bump test, there is coating adhesion on the blade tip, then the wear scar depth is the penetration depth; the penetration depth ratio=blade height change value (negative value) divided by Invasion depth, then the invasion depth ratio is -16.2%.

[0094] The abradability of the coating is determined according to the following rules:

[0095] when h 2 1 , when the penetration depth ratio is...

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Abstract

The invention relates to a method for testing the performance of an abradable coating. The method comprises the steps of rotating a wheel disc provided with a test blade; controlling an invasion platform to execute invasion motion relative to the test blade, wherein an arc-shaped abradable coating concaved towards the test blade is installed on the invasion platform, the test blade is enabled to rub against the concave surface of the arc-shaped abradable coating, and an arc-shaped grinding mark surface is generated on the concave surface of the arc-shaped abradable coating; acquiring the rotating outer diameter R1 of the test blade, the curvature radius R2 of the arc-shaped abradable coating and the chord length L of the arc-shaped grinding mark surface; and calculating the grinding mark depth according to the R1, R2 and L values.

Description

technical field [0001] The invention belongs to the field of aerospace material detection, and in particular relates to a method for testing and evaluating the abradability of a sealing coating. Background technique [0002] Sealing abradable coatings are widely used in aero-engines and gas turbines. They are coated on the stator parts that collide with the rotors. Through the active sacrificial wear of the coatings, the rotor / stator minimum clearance can be controlled, effectively improving engine efficiency and reducing fuel consumption. . The sealing coating rubs against the rotor blade at high temperature and high speed, and the coating is actively worn without wearing or adhering to the rotor blade, which is called abradability. Accurate evaluation of the abradability of the sealing coating is a problem to be solved in this field important question. [0003] The high-temperature and high-speed rubbing test for abradable coatings means that the blade sample is mounted ...

Claims

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Application Information

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IPC IPC(8): G01N3/56G01B11/02
CPCG01N3/56G01B11/02
Inventor 于月光刘建明沈婕孙建刚章德铭张鑫刘通郭丹黄凌峰
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD