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Abradability evaluation method of sealing coating and its application

A technology for sealing coatings and evaluation methods, which is applied in the aerospace field and can solve problems such as inability to evaluate

Active Publication Date: 2020-12-29
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

[0006] In view of the fact that the existing roughness characteristic parameters cannot accurately evaluate the roughness of the wear marks produced by the grinding of the sealing coating and the blade under the high-temperature and high-speed working conditions of the aeroengine, the purpose of the present invention is to provide an abradable sealing coating This evaluation method can accurately evaluate the influence of coating wear scar morphology on the aerodynamic loss in the engine flow channel

Method used

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  • Abradability evaluation method of sealing coating and its application
  • Abradability evaluation method of sealing coating and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A method for evaluating the abradability of a sealing coating, the evaluation method comprising the following steps:

[0086] (1) Take the NiSi-20 boron nitride sealing coating sample prepared by plasma spraying process, the coating thickness is 2mm, the substrate thickness is 6mm, the coating sample size is 100mm×60mm×6mm, and the substrate material is superalloy.

[0087] (2) Take the TA11 titanium alloy simulation blade, the blade tip size is 0.7mm×20mm, use the TA025A spiral micrometer to measure the 20.142mm before the test.

[0088](3) Put the sealing coating samples and simulated blades in steps (1) and (2) on the BKY-HVT300 / 800 high-temperature and high-speed wearable testing machine developed by Mining and Metallurgy Technology Group Co., Ltd., and install The radius of the testing machine after the blade sample is 237.5 mm.

[0089] (4) Then carry out high-temperature rubbing. The specific method of the high-speed rubbing test refers to clamping the alloy sim...

Embodiment 2

[0096] A method for evaluating the abradability of a sealing coating, the evaluation method comprising the following steps:

[0097] (1) ~ (3), with embodiment 1;

[0098] (4) Then carry out high-temperature rubbing. The specific method of the high-speed rubbing test refers to clamping the alloy simulated blade on the outer edge of the wheel that can rotate at high speed, and coating the alloy substrate with the sealing coating to be tested. It is mounted on a platform that can move forward and backward relative to the wheel, and the sealing coating is heated by a high-speed flame. When the wheel rotates at a certain speed, the platform drives the sealing coating to the wheel at a certain speed. The disc moves to realize the high-speed grinding between the blade and the sealing coating.

[0099] Set the parameters of the high-temperature rubbing test as follows: temperature 20°C, linear velocity 100m / s, penetration rate 50μm / s, set penetration depth 1000μm, complete the rubbi...

Embodiment 3

[0101] A method for evaluating the abradability of a sealing coating, the evaluation method comprising the following steps:

[0102] (1) ~ (3), with embodiment 1;

[0103] (4) Then carry out high-temperature rubbing. The specific method of the high-speed rubbing test refers to clamping the alloy simulated blade on the outer edge of the wheel that can rotate at high speed, and coating the alloy substrate with the sealing coating to be tested. It is mounted on a platform that can move forward and backward relative to the wheel, and the sealing coating is heated by a high-speed flame. When the wheel rotates at a certain speed, the platform drives the sealing coating to the wheel at a certain speed. The disc moves to realize the high-speed grinding between the blade and the sealing coating.

[0104] Set the parameters of the high-temperature rubbing test as follows: temperature 1200°C, linear velocity 520m / s, penetration rate 50μm / s, set penetration depth 1000μm, complete the rub...

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Abstract

The invention provides a method for evaluating abradability of a sealing coating and application of the method, and relates to the technical field of aerospace. The evaluation method comprises the steps of firstly, putting an alloy base material coated with the to-be-detected sealing coating and an alloy simulation blade on an abradable testing machine to carry out rub-impact detection; measuringand recording the arithmetic average roughness, the average peak-valley height and the maximum surface peak-valley height of the surface of the abrasion mark of the sealing coating; substituting the measured values into an abrasion mark roughness evaluation formula, and calculating to obtain an abrasion mark roughness score, the abrasion mark roughness evaluation formula being as follows: the abrasion mark roughness score = average peak valley height / (10 * arithmetic average roughness) + maximum surface peak valley height 2 / (20 * arithmetic average roughness); and then analyzing the abrasion mark roughness score to obtain an evaluation result. The evaluation method can accurately reflect the influence of the coating abrasion mark morphology on the aerodynamic loss in an engine flow channel.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to a method for evaluating the abradability of a sealing coating and its application. Background technique [0002] Sealing coating is widely used in aero-engines and gas turbines. It is coated on the stator parts that rub against the rotor. Through the active sacrificial wear of the coating, the minimum gap between the rotor and the stator can be controlled, which can effectively improve engine efficiency, prolong life and reduce fuel consumption. The sealing coating rubs against the rotor blade at high speed, and the coating is actively worn without wearing or adhering to the rotor blade, which is called abradability. Accurately evaluating the abradability of the sealing coating is a problem to be solved in this field. important question. [0003] In order to reduce the aerodynamic loss in the engine flow channel, the surface roughness of the stator parts in the engine flow c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/56G01N3/06G01B21/30G01B11/30
CPCG01B11/30G01B21/30G01N3/06G01N3/068G01N3/56G01N2203/0226G01N2203/0641G01N2203/0682
Inventor 于月光刘建明刘通沈婕孙建刚章德铭郭丹张鑫黄凌峰
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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