Testing device for simulating coupling environment of temperature gradient and corrosive atmosphere
By designing a test device that simulates the coupling environment of temperature gradient and corrosion atmosphere, and using an electric heating furnace and a refrigeration fixture, the problem that existing simulation devices are difficult to achieve high temperature and high temperature gradient is solved, and efficient material failure mechanism analysis is achieved.
Patent Information
- Application Number
- CN202510380500.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2025-07-01
AI Technical Summary
The existing aircraft engine service environment simulation devices are difficult to achieve high temperature, high temperature gradient, high heat flow density, rapid temperature increase and cooling, and high-speed particle erosion at the same time, resulting in poor repeatability of the experiment and high dispersion, and the failure mechanism of the material in a near-service environment cannot be accurately analyzed.
A test device that simulates the coupling environment of temperature gradient and corrosion atmosphere is designed. The combination of an electric heating furnace and a refrigeration fixture is used to pass the corrosion medium into the heating chamber of the electric heating furnace, accurately control the amount and atmosphere composition of the corrosion medium, and simulate the coupling environment of the temperature gradient and corrosion atmosphere in the engine blades or other structures.
It realizes accurate control of corrosion media quality in high-temperature environments, improves experimental repetition and accuracy, and is conducive to the analysis and development of failure mechanisms of materials in near-service environments.
Smart Images
Figure CN120232803A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of service environment simulation equipment for high-temperature structural materials of aero-engines, and particularly to a test device for simulating a coupled environment of temperature gradient and corrosive atmosphere. Background Art
[0002] Aero-engines have always been hailed as the "pearl on the crown", and their development level represents a country's comprehensive scientific and technological level and national defense strength. The thrust-to-weight ratio of an aero-engine is one of the important indicators to measure the engine performance, and it is closely related to the maneuverability and economy of the aircraft. According to the Carnot cycle principle, increasing the inlet temperature of the turbine is the most important and practical method to improve the thrust-to-weight ratio of the engine. Currently, the three common methods to increase the inlet temperature of the turbine are: developing new high-temperature structural materials, film cooling technology, and thermal barrier coating technology. At present, the development of traditional single-crystal superalloys and film cooling technology has approached the limit of materials and processes, and thermal barrier coating technology and the research and development of new high-temperature structural materials have become more practical methods to further increase the turbine inlet temperature.
[0003] The working environment of aero-engines is extremely complex and harsh, including the action of various loads such as high temperature, stress, and corrosive environment. Research shows that high-temperature oxidation, ablation, thermal expansion mismatch, particle erosion, corrosion substance erosion, etc. are the main reasons for the failure of thermal barrier coatings. Premature failure caused by various reasons is the key bottleneck restricting the application and development of thermal barrier coatings and new high-temperature structural materials. Establishing a service environment simulation platform for engines to deeply study the failure mechanisms of thermal barrier coatings and high-temperature structural materials under various conditions is the only way to break through the bottleneck for the improvement and development of thermal barrier coatings and high-temperature structural materials.
[0004] At present, some work on simulating the service environment of aero-engines has been carried out at home and abroad, mainly including coating thermal cycle, thermal gradient, corrosive environment, and thermal, mechanical, and environmental coupling, etc. Most of the existing service environment simulation devices are isothermal thermal cycles without temperature gradient, fuel-gas combustion flame heating, or resistance heating, etc., with slow heating speed and low heating temperature; the service environment of aero-engines has the characteristics of high temperature, high temperature gradient, high heat flux density, rapid heating and cooling, high-speed particle erosion, etc., and it is difficult for existing simulation equipment to achieve these conditions simultaneously.
[0005] It can be found that most of the existing cold and hot cycle simulation devices and corrosive environment simulation devices are isothermal thermal cycles without temperature gradient, which are quite different from the actual service environment. Although the gas thermal shock equipment can form a temperature gradient in the sample, it cannot accurately control the corrosive environment. The corrosive medium added to the flame undergoes complex changes, and it is difficult to control the accurate addition amount, and the actual corrosive environment composition cannot be known. The experimental repeatability is poor and the dispersion is large, which is not conducive to the analysis of the failure mechanism of materials in the near-service environment and the development of research work. Summary of the Invention
[0006] The object of the present invention is to provide a test device for simulating the coupled environment of temperature gradient and corrosive atmosphere to solve the problems existing in the above-mentioned prior art. In a high-temperature environment, the amount of corrosive medium can be more accurately controlled, the experiment has high repeatability, which is conducive to the analysis of the failure mechanism of materials in the near-service environment and the development of research work.
[0007] To achieve the above object, the present invention provides the following solutions:
[0008] A test device for simulating the coupled environment of temperature gradient and corrosive atmosphere includes an electric heating furnace and a refrigeration fixture. The electric heating furnace has a heating chamber for accommodating a sample, and a corrosive medium inlet is provided on the heating chamber, and the corrosive medium inlet is used to connect a corrosive medium supply device; the refrigeration fixture is arranged in the heating chamber, the refrigeration fixture is used to clamp the sample, and the refrigeration fixture is attached to the back surface of the sample; a cooling medium flow passage for cooling the back surface of the sample is provided in the refrigeration fixture.
[0009] As an embodiment, the corrosive medium supply device includes a main pipeline, a first branch pipe, a second branch pipe, a corrosive liquid tank and a corrosive gas tank. One end of the main pipeline is communicated with the corrosive medium inlet, and the other end is communicated with one end of the first branch pipe and one end of the second branch pipe. The other ends of the first branch pipe and the second branch pipe are respectively communicated with the corrosive liquid tank and the corrosive gas tank.
[0010] As an embodiment, the corrosive liquid tank includes a kerosene storage tank, a water storage tank, a brine storage tank and an ethanol storage tank.
[0011] As an embodiment, the corrosive gas tank includes a water vapor storage tank, a hydrogen sulfide storage tank and a sulfur dioxide storage tank.
[0012] As an embodiment, a peristaltic pump is provided on the first branch pipe.
[0013] As an embodiment, a liquid flow meter and a liquid flow regulating valve are provided on the first branch pipe.
[0014] As an embodiment, a gas flow meter and a gas flow regulating valve are provided on the second branch pipe.
[0015] As an embodiment, the refrigeration fixture includes a receiving groove for placing a sample, and the cooling medium flow passage is located at the bottom of the receiving groove or is arranged around the receiving groove; through holes are provided on the bottom surface of the receiving groove, and the through holes are used to connect thermocouples.
[0016] As an embodiment, the refrigeration fixture is made of copper.
[0017] As an embodiment, the electric heating furnace is a high-temperature box furnace.
[0018] The present invention has the following technical effects compared with the prior art:
[0019] By using the electric heating furnace as a heating tool and introducing a corrosive medium into the heating chamber of the electric heating furnace to simulate the temperature gradient and corrosive atmosphere coupling environment in which the engine blade or other structures are located, since the electric heating furnace does not heat the sample by flame, the corrosive medium will not contact the flame after being introduced into the heating chamber, so that the complex changes caused by contacting the flame will not occur. The amount of the corrosive medium in the high-temperature environment is easier to accurately control, and the experimental repeatability is high, which is beneficial to the analysis of the failure mechanism of materials in the near-service environment and the development of research work. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0021] Figure 1 It is a schematic structural diagram of a refrigeration fixture in an embodiment of the present invention;
[0022] Figure 2 is Figure 1 a longitudinal sectional structural diagram of.
[0023] Figure 3 It is a schematic structural diagram of a high-temperature box furnace in an embodiment of the present invention;
[0024] Figure 4 is Figure 3 a schematic structural diagram of the high-temperature box furnace after removing the end cover in;
[0025] Description of the reference numerals:
[0026] 1. Refrigeration fixture; 11. Accommodating groove; 12. Through hole; 13. Cooling medium circulation channel; 2. High-temperature box furnace; 21. Outer shell; 22. Heating chamber; 23. Bracket. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0028] The object of the present invention is to provide a test device for simulating the coupled environment of temperature gradient and corrosive atmosphere, so as to solve the problems existing in the prior art. In a high-temperature environment, the amount of corrosive medium can be more precisely controlled, and the experiment has high repeatability, which is conducive to the analysis of the failure mechanism of materials in the near-service environment and the development of research work.
[0029] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0030] As Figures 1 to 4 shown, this embodiment provides a test device for simulating the coupled environment of temperature gradient and corrosive atmosphere, including an electric heating furnace and a refrigeration fixture 1. The electric heating furnace has a heating chamber 22 for accommodating a sample. A corrosive medium inlet is provided on the heating chamber 22, and the corrosive medium inlet is used to connect a corrosive medium supply device to introduce corrosive gas and / or corrosive liquid into the heating chamber 22. One or more corrosive medium inlets can be provided. The refrigeration fixture 1 is arranged in the heating chamber 22. The refrigeration fixture 1 is used to clamp the sample, and the surface of the sample has a thermal barrier coating or it is a high-temperature structural material itself. After the refrigeration fixture 1 clamps the sample, the refrigeration fixture 1 is attached to the back surface of the sample. The refrigeration fixture 1 has a cooling medium circulation channel 13 inside, which can cool the back surface of the sample. The electric heating furnace can at least heat the front surface of the sample. After the refrigeration fixture 1 cools the back surface of the sample, the sample is in a temperature gradient environment. The cooling medium in the cooling medium circulation channel 13 can be cold water. There is a cold water pool and a circulation pump outside the electric heating furnace. The refrigeration fixture 1 has a water inlet pipe and a water outlet pipe communicated with the cooling medium circulation channel 13. The water inlet pipe is communicated with the cold water pool through the circulation pump, and the water outlet pipe is communicated with the cold water pool.
[0031] When conducting the experiment, place the sample on the refrigeration fixture 1 in the heating chamber 22, turn on the electric heating furnace to heat the sample, and at the same time, introduce cold water into the refrigeration fixture 1 to cool the back surface of the sample, so that a temperature gradient is generated inside the sample. Introduce corrosive gas and / or corrosive liquid into the heating chamber 22 through the corrosive medium inlet, and complete the coupled environment of temperature gradient and corrosive atmosphere where the aero-engine blade or other structures are located in the heating chamber 22. After the experiment is carried out for a certain period of time, take out the sample and observe the change of the thermal barrier coating on its surface or its own structure.
[0032] In the prior art, a flame gun is usually used to heat a sample, and a corrosive medium is matched to simulate the actual working environment of an engine blade. However, after the corrosive medium enters the flame environment, complex changes will occur, and there is a difference between the added amount of the corrosive medium and the amount of the corrosive medium present in the high-temperature environment, resulting in difficulty in controlling the amount of the corrosive medium in the high-temperature environment, inability to know the composition of the actual corrosive environment, poor experimental repeatability, and large dispersion, which is not conducive to the analysis of the failure mechanism of materials in the near-service environment and the development of research work.
[0033] In this embodiment, an electric heating furnace is used as the heating tool, and a corrosive medium is introduced into the heating chamber 22 of the electric heating furnace to simulate the temperature gradient and corrosive atmosphere coupling environment in which the engine blade or other structures are located. Since the electric heating furnace does not heat the sample through a flame, the corrosive medium will not contact the flame after being introduced into the heating chamber 22, so that complex changes caused by contacting the flame will not occur, the amount of the corrosive medium in the high-temperature environment is easier to accurately control, the experimental repeatability is high, and it is conducive to the analysis of the failure mechanism of materials in the near-service environment and the development of research work.
[0034] In this embodiment, the corrosive medium supply device includes a main pipeline, a first branch pipe, a second branch pipe, a corrosive liquid tank, and a corrosive gas tank. One end of the main pipeline is connected to the corrosive medium inlet, and the other end is connected to one end of the first branch pipe and one end of the second branch pipe. The other ends of the first branch pipe and the second branch pipe are respectively connected to the corrosive liquid tank and the corrosive gas tank. The corrosive liquid and the corrosive gas are mixed in the main pipeline and then enter the heating chamber 22.
[0035] In this embodiment, the corrosive liquid tank includes a kerosene storage tank, a water storage tank, a brine storage tank, and an ethanol storage tank. During the experiment, one or more corrosive liquids can be added. A peristaltic pump is provided on the first branch pipe to provide power for the injection of the corrosive liquid. A liquid flowmeter and a liquid flow regulating valve are provided on the first branch pipe to accurately control the injection amount of the corrosive liquid.
[0036] In this embodiment, the corrosive gas tank includes a water vapor storage tank, a hydrogen sulfide storage tank, and a sulfur dioxide storage tank. It can also include a high-pressure nitrogen storage tank, and the high-pressure nitrogen storage tank is connected to one of the corrosive gas storage tanks through a pipeline to drive the corresponding corrosive gas into the heating chamber 22. A gas flowmeter and a gas flow regulating valve are provided on the second branch pipe to accurately control the injection amount of the corrosive gas. When using high-pressure nitrogen to inject the corresponding corrosive gas, the amount of the corrosive gas can be obtained according to the amount of the injected nitrogen and the total amount of the injected nitrogen + corrosive gas mixture.
[0037] In this embodiment, the refrigeration fixture 1 can be horizontally fixed in the heating chamber 22. The refrigeration fixture 1 includes a receiving groove 11 for placing a sample. The cross-sectional shape of the receiving groove 11 is adapted to the cross-sectional shape of the sample, and the cross-sectional area of the receiving groove 11 is slightly larger than the cross-sectional area of the sample, facilitating the placement of the sample into the receiving groove 11. The depth of the receiving groove 11 is adjusted according to the thickness of the sample to ensure that the sample is in a temperature gradient environment and a temperature gradient will also be formed inside the sample itself. The cooling medium circulation channel 13 is located at the bottom of the receiving groove 11 or is arranged around the receiving groove 11 to ensure that the back surface of the sample can be cooled, enabling the sample to be in a temperature gradient environment. Through holes 12 are provided on the bottom surface of the receiving groove 11. The through holes 12 are used to connect thermocouples. The wires connecting the thermocouples are led outside the electric heating furnace and connected to the control system to monitor the cooling temperature in real time. The thermocouple can be an S-type thermocouple, i.e., a platinum rhodium 10-platinum thermocouple. The front surface of the sample is heated by the electric heating furnace, and its surface temperature can be equivalent to the temperature of the heating chamber 22 inside the electric heating furnace. For the purpose of improving accuracy, a thermocouple can also be provided on the front surface of the sample for temperature measurement.
[0038] As an implementation manner, in this embodiment, the refrigeration fixture 1 is made of copper, enabling it to have good heat and cold transfer efficiencies.
[0039] As an implementation manner, in this embodiment, the electric heating furnace is a high-temperature box furnace 2. Most of the furnace lining inside the furnace is made of refractory materials and heat-insulating materials, and it can operate under hydrogen, nitrogen or vacuum conditions, with a general operating temperature of 800°C to 1600°C. The high-temperature box furnace 2 generally includes a housing 21, a heating chamber 22 inside the housing 21, and a support 23 at the bottom of the housing 21. The high-temperature box furnace 2 is a commonly used device in the art, and its structural composition will not be elaborated in this embodiment.
[0040] Adaptations made according to actual requirements are all within the protection scope of the present invention.
[0041] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, based on the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.
Claims
1. A test device for simulating a temperature gradient and a corrosive atmosphere coupled environment, characterized in that: include: An electric heating furnace, wherein the electric heating furnace has a heating chamber for accommodating the sample, wherein the heating chamber is provided with a corrosive medium inlet, and the corrosive medium inlet is used to connect to a corrosive medium supply device; and a cooling fixture, wherein the cooling fixture is arranged in the heating chamber, the cooling fixture is used to clamp the sample, and the cooling fixture is attached to the back side of the sample; and a cooling medium flow channel for cooling the back side of the sample is provided in the cooling fixture.
2. The test device for simulating a temperature gradient and a corrosive atmosphere coupling environment according to claim 1, characterized in that: The corrosive medium supply equipment includes a main line, a first branch pipe, a second branch pipe, a corrosive liquid tank and a corrosive gas tank. One end of the main line is connected to the corrosive medium inlet, and the other end is connected to one end of the first branch pipe and one end of the second branch pipe. The other end of the first branch pipe and the other end of the second branch pipe are connected to the corrosive liquid tank and the corrosive gas tank respectively.
3. The test device for simulating a temperature gradient and a corrosive atmosphere coupling environment according to claim 2, characterized in that: The corrosive liquid tanks include kerosene storage tanks, water storage tanks, brine storage tanks and ethanol storage tanks.
4. The test device for simulating a temperature gradient and a corrosive atmosphere coupling environment according to claim 2, characterized in that: The corrosive gas tanks include a water vapor storage tank, a hydrogen sulfide storage tank and a sulfur dioxide storage tank.
5. The test device for simulating a temperature gradient and a corrosive atmosphere coupled environment according to claim 2, characterized in that: The first branch pipe is provided with a peristaltic pump.
6. The test device for simulating a temperature gradient and a corrosive atmosphere coupled environment according to claim 5, characterized in that: The first branch pipe is provided with a liquid flow meter and a liquid flow regulating valve.
7. The test device for simulating a temperature gradient and a corrosive atmosphere coupled environment according to claim 2, characterized in that: The second branch pipe is provided with a gas flow meter and a gas flow regulating valve.
8. The test device for simulating a temperature gradient and a corrosive atmosphere coupled environment according to any one of claims 1 to 7, characterized in that: The refrigeration fixture comprises a receiving groove for placing the sample, and the cooling medium flow channel is located at the bottom of the receiving groove or is arranged around the receiving groove; a through hole is arranged on the bottom surface of the receiving groove, and the through hole is used to connect the thermocouple.
9. The test device for simulating a temperature gradient and a corrosive atmosphere coupled environment according to claim 8, characterized in that: The refrigeration fixture is made of copper.
10. The test device for simulating a temperature gradient and a corrosive atmosphere coupled environment according to claim 1, characterized in that: The electric heating furnace is a high-temperature box-type furnace.