CN-122016624-A - System and method for simulating oil mist erosion test of multi-layer thermal barrier coating by electric control oil injection

CN122016624ACN 122016624 ACN122016624 ACN 122016624ACN-122016624-A

Abstract

The invention relates to an electric control oil injection simulation multi-layer thermal barrier coating oil mist erosion test system and method. The system comprises a fuel supply unit, an electric control fuel injection simulation device, an erosion cavity, a damage monitoring device, a controller, a pressure sensor, an acoustic emission AE sensor, a slide rail height adjusting mechanism and the like. During testing, one or more multi-layer thermal barrier coating samples are fixed in an erosion cavity, fuel oil is injected to the samples by utilizing an electric control fuel injection simulation device, and quality changes, surface morphology changes, denudation area changes and acoustic emission characteristic quantity changes of the samples are collected by utilizing a damage monitoring device, an acoustic emission AE sensor and the like, so that various performances of the multi-layer thermal barrier coating attached to the surfaces of the samples are evaluated. The invention accurately regulates and controls the whole testing process through the oil injection pressure closed-loop control circuit and the damage closed-loop control circuit, has the advantages of accurate and reliable result, good repeatability and the like, and can be used for system evaluation of the integral and layered damage characteristics of the multilayer thermal barrier coating.

Inventors

FEI CHUNGUANG
YU WENZHE
QIAN ZUOQIN
CAO XUEQIANG
DONG SHUJUAN
CHEN WENBO
JIANG JIANING
DENG LONGHUI
ZHU SIWEI

Assignees

武汉理工大学

Dates

Publication Date: 20260512
Application Date: 20260317

Claims (10)

1. An electronic control oil injection simulation multi-layer thermal barrier coating oil mist erosion test system is characterized by comprising: The electric control oil injection simulation device is used for injecting fuel to a sample to be tested in a controlled manner and forming oil mist required by the test; the erosion cavity is used for fixing a sample to be tested and providing a test place; the damage monitoring device is used for monitoring damage condition of the sample to be tested in the test process; And the controller is used for regulating and controlling the test system.
2. The electrically controlled oil spray simulation multi-layer thermal barrier coating oil mist erosion test system of claim 1, further comprising a fuel supply unit, wherein the fuel supply unit comprises a fuel tank and an oil pump, wherein the fuel tank is communicated with the electrically controlled oil spray simulation device through the oil pump, and wherein the oil pump is connected with and controlled by the controller.
3. The electrically controlled oil spray simulated multi-layer thermal barrier coating oil mist erosion test system of claim 2, further comprising a pressure sensor connected to and controlled by the controller, wherein the pressure sensor is disposed on an oil supply line between the fuel supply unit and the electrically controlled oil spray simulation device or on a high pressure oil line of the electrically controlled oil spray simulation device.
4. The electrically controlled oil spray simulated multi-layer thermal barrier coating oil mist erosion test system of claim 1, further comprising a height adjustment mechanism, wherein the electrically controlled oil spray simulation device is fixed to and moves with the height adjustment mechanism.
5. The electrically controlled oil spray simulated multi-layer thermal barrier coating oil mist erosion test system of claim 1, further comprising a sample clamping assembly secured within the erosion chamber, at least one sample mounting fixture positioned on the sample clamping assembly.
6. The electrically controlled oil-spraying simulated multi-layer thermal barrier coating oil mist erosion testing system of claim 1, wherein the damage monitoring device comprises an acoustic emission AE sensor, a pre-amplification and filtering module and a data acquisition module, wherein the acoustic emission AE sensor is connected with the pre-amplification and filtering module, the pre-amplification and filtering module is connected with the data acquisition module, and the acoustic emission AE sensor, the pre-amplification and filtering module and the data acquisition module are all connected with and controlled by a controller.
7. The electrically controlled oil-spraying simulated multi-layer thermal barrier coating oil mist erosion testing system of claim 1, wherein the test sample has a multi-layer composite structure and sequentially comprises an alloy substrate layer, a metal bonding layer, a thermal stress control layer, an anti-corrosion oxidation layer, a thermal insulation layer and an anti-corrosion layer.
8. The method is characterized by comprising the steps of fixing at least one sample to be tested in an erosion cavity, starting an electric control oil injection simulation device to perform oil injection test, monitoring damage conditions of the sample by using a damage monitoring device, monitoring fuel injection pressure by using a pressure sensor, and regulating and controlling the whole testing system by using a controller based on monitoring results.
9. The method of claim 8, wherein the electronically controlled fuel injection simulation device intermittently injects fuel and the test sample is analyzed and tested during the intermittent injection.
10. The test method according to claim 8, wherein the controller regulates the whole test system based on at least two loops, including an injection pressure closed-loop control loop and a damage closed-loop control loop, wherein the regulating process based on the injection pressure closed-loop control loop comprises collecting an injection pressure signal by using a pressure sensor and feeding back to the controller, the controller regulates an electronic control injection simulation device to keep the injection pressure stable, and the regulating process based on the damage closed-loop control loop comprises collecting a quality change, a surface topography change, a denuded area change, an acoustic emission characteristic quantity change of a sample to be tested by using a damage detection device and forming a damage characteristic signal, and the controller receives the signal and regulates injection parameters.

Description

System and method for simulating oil mist erosion test of multi-layer thermal barrier coating by electric control oil injection Technical Field The invention relates to the technical fields of coating composite materials, engines, analysis tests and the like, in particular to an electric control oil injection simulation multi-layer thermal barrier coating oil mist erosion test system and method. Background The thermal barrier coating is widely applied to the surfaces of key parts of high-temperature power equipment such as diesel engines, gas turbines, aeroengines and the like, so that the thermal load born by a matrix is reduced, and the service life of the parts is prolonged. In order to adapt to a complex service environment, the thermal barrier coating generally adopts a multi-layer structure, and comprises an anti-corrosion layer, a heat insulation layer, an anti-oxidation corrosion layer, a thermal stress control layer, a metal bonding layer and the like, and specific reference can be made to CN120443095A, CN118422101A, CN118186331A, CN101660115A and the like. In the actual running process of the diesel engine, high-pressure oil mist formed by periodical injection of the oil injector can generate long-term erosion effect on the inner wall of the combustion chamber and the surface coating thereof, and can possibly cause the problems of surface erosion, microcrack initiation and expansion, interlayer bonding performance degradation and the like, thereby reducing the service performance and the service life of the multilayer thermal barrier coating. The existing coating performance evaluation method is mainly focused on a thermal cycle test, a particle erosion test or a high-temperature oxidation test, the oil injection and oil mist erosion working condition is difficult to simulate under the condition of a non-real diesel engine, the erosion condition is difficult to accurately control, and the test repeatability and comparability are insufficient. Therefore, a new testing system and testing method are necessary to be developed, controllable simulation of oil mist erosion conditions can be realized without actual diesel engine conditions, and the oil mist erosion resistance of the multilayer thermal barrier coating can be systematically evaluated. Disclosure of Invention The invention mainly aims to solve the problems that in the prior art, the oil spray and oil mist erosion working condition is difficult to simulate under the condition of a non-real diesel engine, the erosion condition is difficult to accurately regulate and control, the test repeatability is insufficient and the like, and develops a brand-new test system and a corresponding test method for simulating the oil mist erosion of the multi-layer thermal barrier coating by electrically controlling oil spray. The system can simulate the erosion condition of oil injection mist, reduce test cost and improve test safety, and can stabilize the oil injection condition through the oil injection pressure closed-loop control loop, so that the repeatability and comparability of the test are improved. Besides, the method realizes controllable adjustment of erosion damage evolution rate through a damage closed-loop control loop, is particularly suitable for system evaluation of integral and layered damage characteristics of the multilayer thermal barrier coating, and has good application prospect. Therefore, the electric control oil injection simulation multi-layer thermal barrier coating oil mist erosion testing system provided by the invention mainly comprises the following components: The electric control oil injection simulation device 2 is mainly used for injecting fuel oil to the multilayer thermal barrier coating sample 5 in a controlled manner and forming oil mist required by a test; The erosion cavity 3 is mainly used for fixing a multi-layer thermal barrier coating sample 5 and providing a place or space required by a test; the damage monitoring device 4 is mainly used for monitoring damage condition of the multilayer thermal barrier coating sample 5 in the test process; The controller 6 is mainly used for regulating and controlling devices including the electric control oil injection simulation device 2, the damage monitoring device 4 and the like to complete testing. In the above-described solution, the system further comprises a fuel supply unit 1, said fuel supply unit 1 comprising a fuel tank and a fuel pump. The oil tank is communicated with the electric control oil injection simulation device 2 through an oil pump, and fuel oil required by testing is provided for the electric control oil injection simulation device. The oil pump is connected to the controller 6 and is controlled by it to pump fuel. In the above solution, the system further comprises a pressure sensor 7, said pressure sensor 7 being connected to and controlled by the controller 6. The pressure sensor 7 is arranged on the fuel supply line between the fuel supply unit 1 an