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Test apparatus for thermal shock life evaluation of thermal barrier coating

A technology of thermal barrier coating and evaluation test, which is applied in measurement devices, instruments, scientific instruments, etc., to achieve the effect of convenient data query, quick operation and friendly man-machine interface

Inactive Publication Date: 2016-08-17
CHINESE ACAD OF AGRI MECHANIZATION SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of simulating the complex service environment of aeroengine turbine blades, and provide a thermal shock life evaluation test device for thermal barrier coatings under the conditions of simulating high temperature, gradient temperature, and CMAS coupling environment, in order to effectively evaluate high temperature components in complex service The fatigue failure process and reliability in the environment provide an important test platform

Method used

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  • Test apparatus for thermal shock life evaluation of thermal barrier coating
  • Test apparatus for thermal shock life evaluation of thermal barrier coating

Examples

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Effect test

application example 1

[0100] The sample thermal barrier coating was sprayed by atmospheric plasma, and the coating thickness was 250 μm. The front side of the sample is heated to 1200°C, and the cooling temperature on the back side is kept at 900°C for 5 minutes. During the CMAS coupling test, the liquid material delivery flow rate is 10LPM, the compressed air pressure is 0.04MPa, and the CMAS suspension concentration is 0.1%. After 107 coupling tests, the surface of the sample had obvious deposition of CMAS substances, and at the same time, the surface of the sample had obvious coating peeling, and the peeling area reached 20% of the surface coating, and part of the bonding layer was exposed.

application example 2

[0102] The sample thermal barrier coating was sprayed by supersonic plasma, and the thickness of the coating was 250 μm. The front side of the sample is heated to 1200°C, and the cooling temperature on the back side is kept at 900°C for 5 minutes. During the CMAS coupling test, the liquid material delivery flow rate is 10LPM, the compressed air pressure is 0.04MPa, and the CMAS suspension concentration is 1%. After 20 coupling cycles, there were obvious CMAS deposits on the surface of the sample, but the coating did not fail. After 31 coupling tests, the coating in the central area had obvious CMAS deposition, and part of the coating peeled off. fail.

application example 3

[0104] The sample thermal barrier coating is supersonic plasma sprayed, and the coating thickness is 250 μm. The front side of the sample is heated to 1200°C, and the cooling temperature on the back side is kept at 900°C for 5 minutes. During the CMAS coupling test, the liquid material delivery flow rate is 10LPM, the compressed air pressure is 0.04MPa, and the CMAS suspension concentration is 1%. After 20 coupling cycles, there is a small amount of CMAS deposits on the surface of the sample. After 60 tests, the coating in the central area of ​​the sample has obvious CMAS deposition. After 82 tests, the coating in the central area is obviously peeled off, and there are CMAS substances Deposit again on flaking areas.

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Abstract

The invention provides a thermal shock life evaluation test device for thermal barrier coatings, which includes: a heating system, a CMAS liquid material delivery system, a cooling system and a control system; the heating system provides a combustion flame jet to realize the simulation of the high-temperature environment of the test sample heating , and achieve cyclic heating under a certain temperature gradient; the CMAS liquid material delivery system transports the CMAS suspension while the heating system is heating, and the CMAS suspension is atomized by the air jet and injected into the combustion flame at a set angle and speed to Simulate the actual state of CMAS; after the heating, the cooling system cools the test sample through a cooling air circuit; the control system connects and controls the heating system, CMAS liquid material delivery system and cooling system to achieve high temperature and gradient temperature , Simulating the service environment of thermal barrier coatings under CMAS coupled environmental conditions and automatically controlling the entire process test process.

Description

technical field [0001] The invention relates to a thermal shock life evaluation test device for thermal barrier coatings, in particular to a device that combines high temperature, gradient temperature, and CMAS (i.e., CaO-MgO-Al 2 o 3 -SiO 2 The invention relates to a thermal shock life evaluation test device for thermal barrier coatings under the environmental conditions of sediments, belonging to the field of special service environment simulation devices for thermal spray coatings. Background technique [0002] Increasing the inlet temperature before the engine turbine is a major feature of advanced aero-engines. At present, the temperature before the turbine of advanced engines has reached nearly 1800K, and the DZ125 used as the base material of the turbine blades is far from meeting the temperature requirements. Although in actual working conditions, the engine The turbine blade adopts the film cooling structure technology, so that a certain gradient temperature is fo...

Claims

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Application Information

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IPC IPC(8): G01N3/60
Inventor 汪瑞军张天剑刘毅何箐吴鹏
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI
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