Metal material high-temperature and high-pressure oxygen-enriched combustion test equipment and test method thereof

Abstract

The invention belongs to the field of metal material combustion behavior testing and failure evaluation, and particularly relates to metal material high-temperature and high-pressure oxygen-enriched combustion testing equipment and a testing method thereof. The equipment comprises a pressure container, a sample bracket, an air inlet and exhaust system, a heating system, an ignition system, a recording system, a ceramic receiving cup and a base. The oxygen-enriched combustion resistance detection module is used for detecting oxygen-enriched combustion resistance of a metal sample, including maximum non-combustion pressure and maximum non-combustion temperature; the method comprises: adding a combustion improver to one end of a test sample; emptying air in the pressure container; high-pressure oxygen is injected into the pressure container; a high-frequency induction heating power supply is started, the sample is ignited, and high-temperature molten drops obtained after combustion reaction drop into the ceramic material receiving cup; starting a high-speed camera to shoot a combustion process; and measuring the residual length after the test sample stops burning. The device has the advantages of solving the problem of a non-metal material oxygen-enriched combustion resistance testing device, improving the test safety and being suitable for testing the combustion performance of a metal material in a high-temperature and high-pressure oxygen-enriched environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of testing the combustion behavior of metal materials and failure evaluation, and particularly relates to a high-temperature and high-pressure oxygen-rich combustion test device for metal materials and a testing method thereof. Background Art

[0002] The power system is the foundation and core of space development. The magnitude of its thrust determines the carrying capacity of the rocket. Developing a heavy-lift launch vehicle and its power plant is the key.

[0003] The propellant is the source of power for the rocket engine and also determines the development direction of the rocket engine. The liquid oxygen-kerosene propellant has the characteristics of low cost, high reliability, non-toxic and environmental protection. It has replaced the highly toxic fuel of unsymmetrical dimethylhydrazine in the early stage and has become the primary choice for the first-stage power device of rockets worldwide. Currently, the thrust of liquid oxygen-kerosene rocket engines still cannot meet the strategic deployment of manned lunar landing. It is necessary to develop a heavy rocket with a takeoff weight of at least 3000 tons, which poses higher requirements for the first-stage engine of the rocket.

[0004] The difficulty in the research and development of new rocket engines lies in the turbopump system. The turbopump is the only large-load and high-speed moving component in a liquid rocket engine. It is the heart of the liquid rocket engine and also the component with the highest technical content in the entire liquid rocket engine. Among them, the working environment of the turbine is a high-temperature, high-pressure and oxygen-rich environment. Under such conditions, metal materials are prone to a phenomenon similar to the combustion of wood, called metal combustion, and the ignition point of the material gradually decreases as the pressure increases. There is an urgent need to develop high-pressure oxygen-rich combustion equipment and establish an evaluation method for oxygen-rich combustion of materials to provide support for the research and development of materials resistant to high-pressure oxygen-rich combustion. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-temperature and high-pressure oxygen-rich combustion test device for metal materials and a testing method thereof to provide support for the research and development of materials resistant to high-pressure oxygen-rich combustion.

[0006] To achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0007] A high-temperature and high-pressure oxygen-rich combustion test device for metal materials, which is composed of a pressure vessel, a sample holder 5, an inlet and exhaust system, a heating system, an ignition system, a recording system, a ceramic receiving cup 13, and a base 15. Among them:

[0008] The pressure vessel is composed of an outer pressure-resistant shell 1 and an inner copper lining 2. The pressure vessel is arranged on the base 15, and the pressure vessel is hermetically connected to the base 15; the sample holder 5 is located in the copper lining 2. A sample clip 6 is provided at the top of the sample holder 5. The rod-shaped test sample 7 is vertically suspended inside the copper lining 2 by using the sample clip 6, and a ceramic receiving cup 13 is arranged below the test sample 7;

[0009] The intake and exhaust system consists of a high-pressure oxygen pump, an intake pipe 3, an exhaust pipe 4, pneumatic valves, stop valves, pressure sensors, and a PLC. The intake pipe 3 and the exhaust pipe 4 are both inserted into the copper liner 2. The high-pressure oxygen pump is connected to the intake pipe 3 through a pneumatic valve, and the outlet pressure of the high-pressure oxygen pump is controlled by a pressure sensor. A stop valve is provided on the exhaust pipe 4. The PLC is respectively connected to the high-pressure oxygen pump, the pressure sensor, the pneumatic valve, and the stop valve.

[0010] The heating system consists of a temperature controller, a high-frequency induction heating power supply, heating copper bars, thermocouple electrodes 16, coaxial induction heating electrodes 17, and a high-frequency induction heating coil 9. The thermocouple electrodes 16 are welded to the middle of the test sample 7. The high-frequency induction heating coil 9 surrounds the test sample 7, and the high-frequency induction heating coil 9 is connected to the coaxial induction heating electrode 17. The input end of the temperature controller is connected to the thermocouple electrodes 16, and the output end is connected to the high-frequency induction heating power supply. The high-frequency induction heating power supply is connected to the coaxial induction heating electrode 17 through the heating copper bars.

[0011] The ignition system includes a DC power supply and an ignition electrode 11. A NiCr resistance wire is connected between the positive and negative poles of the ignition electrode 11.

[0012] The recording system consists of a high-speed camera 10 and a sapphire observation window 8. The sapphire observation window 8 is arranged on the side wall of the pressure vessel, and the high-speed camera 10 is arranged facing the sapphire observation window 8.

[0013] The base 15 is provided with through holes for embedding the coaxial induction heating electrode 17, the ignition electrode 11, and the thermocouple electrodes 16.

[0014] As a preferred technical solution:

[0015] The test equipment adopts a vertical bottom-opening form. The base 15 is composed of a double-layer structure of an upper copper base and a lower stainless-steel base, and the lifting of the base 15 is controlled by a motor.

[0016] The pressure-resistant housing 1 and the base 15 are locked by a slider locking device 14. The used sealing structure is end face sealing, and the sealing material is a fluororubber sealing ring 12.

[0017] Seals are adopted between the ignition electrode 11, the thermocouple electrodes 16, the coaxial induction heating electrode 17 and the through holes of the base 15, with a circumferential O-ring + butterfly ring, and the sealing material is fluororubber.

[0018] The pressure-resistant housing 1 is made of stainless steel, and the sample clamp 6 is made of pure copper.

[0019] Both the intake pipe 3 and the exhaust pipe 4 are high-pressure resistant pipelines.

[0020] The bottom of the test sample 7 is wound with a combustion promoter, preferably Al or Mg, and the NiCr resistance wire is wound outside the combustion promoter.

[0021] The size of the test sample 7 is with a length of not less than 110 mm.

[0022] The thickness of the pressure-resistant housing 1 is 40 - 60 mm, and the thickness of the copper inner liner 2 is 10 - 15 mm.

[0023] The equipment of the present invention can be used to detect the anti-oxygen-rich combustion performance of metal samples, including the highest non-combustion pressure and the highest non-combustion temperature, and comprises the following steps:

[0024] (1) Measure the original size of the test sample 7, add a combustion promoter at one end of the test sample 7, wind the NiCr resistance wire outside the combustion promoter, and connect the two ends of the resistance wire to the positive and negative electrodes of the ignition electrode 11;

[0025] (2) Raise the base 15 and lock the pressure vessel and the base 15;

[0026] (3) Use the PLC control program to start the high-pressure oxygen pump, open the intake pneumatic valve, inject high-purity oxygen into the pressure vessel. After the pressure reaches 3.5 MPa, close the intake valve, open the stop valve. After the pressure drops to 0.1 MPa, close the stop valve. Repeat this process three times to evacuate the air inside the pressure vessel;

[0027] (4) Inject high-pressure oxygen into the pressure vessel and reach the predetermined test pressure;

[0028] (5) Start the high-frequency induction heating power supply, and use the high-frequency induction heating coil 9 to heat the test sample 7;

[0029] (6) After the test sample 7 is heated to the predetermined temperature, ignite it, or directly ignite it without heating. Start the DC power supply of the ignition system, generate a large current between the positive and negative electrodes of the ignition electrode 11 to ignite the NiCr resistance wire and the combustion promoter, and the combustion promoter drives the test sample 7 to burn. The high-temperature molten droplets of the combustion reaction fall into the ceramic material receiving cup 13;

[0030] (7) Start the high-speed camera 10 to shoot the combustion process;

[0031] (8) After the combustion of the test sample 7 stops, turn off the high-frequency induction heating power supply, open the stop valve. When the pressure inside the pressure vessel drops to 0.1 MPa, lower the base 15, take out the test sample 7 and measure its remaining length.

[0032] The advantages and beneficial effects of the present invention are as follows:

[0033] The present invention provides a high-temperature, high-pressure and oxygen-rich combustion test device for metal materials and its testing method, which solves the problem of the lack of a test device for the combustion resistance performance of metal materials under high temperature, high pressure and oxygen-rich conditions, and provides support for the research and development of high-pressure oxygen-rich combustion-resistant materials. The key technology lies in the flame retardance of the pressure vessel, which adopts a double-layer structure design of an outer pressure-resistant shell and an inner copper lining. The copper has a very low calorific value of combustion, can be compatible with the pure oxygen environment, can play a role in flame retardance and heat conduction, effectively protects the pressure-resistant shell from the erosion of pure oxygen and high-temperature molten slag after combustion, and improves the test safety. It is applicable to the combustion performance test of metal materials in a high-temperature, high-pressure and oxygen-rich environment. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of the high-temperature, high-pressure and oxygen-rich combustion test equipment of the present invention;

[0035] Figure 2 It is the combustion process of Example 1 in a 3.5 MPa pure oxygen environment;

[0036] Figure 3 It is the test result of the oxygen-rich combustion resistance performance of Example 1;

[0037] Figure 4 It is the test result of the oxygen-rich combustion resistance performance of Example 2;

[0038] Figure 5 It is the test result of the oxygen-rich combustion resistance performance of Example 3;

[0039] In the figure: 1 - pressure-resistant shell; 2 - copper lining; 3 - intake pipe; 4 - exhaust pipe; 5 - sample support; 6 - sample clamp; 7 - test sample; 8 - sapphire observation window; 9 - high-frequency induction heating coil; 10 - high-speed camera; 11 - ignition electrode; 12 - fluororubber sealing ring; 13 - ceramic material receiving cup; 14 - slider locking device; 15 - base; 16 - thermocouple electrode; 17 - coaxial induction heating electrode. Detailed Embodiments

[0040] The present invention will be further described in detail below with reference to the drawings and embodiments:

[0041] Example 1

[0042] As Figure 1 shown, a high-temperature, high-pressure and oxygen-rich combustion test device for metal materials, the test device adopts a vertical bottom-opening form, and is composed of a pressure vessel, a sample support 5, an intake and exhaust system, a heating system, an ignition system, a recording system, a ceramic material receiving cup 13, and a base 15, wherein:

[0043] The pressure vessel is composed of an outer stainless steel pressure-resistant shell 1 (with a thickness of 50 mm) and an inner copper lining 2 (with a thickness of 10 mm). The pressure vessel is arranged on a base 15, and the pressure-resistant shell 1 and the base 15 are locked by a slider locking device 14. The used sealing structure is end face sealing, and the sealing material is a fluororubber sealing ring 12; the base 15 is composed of a double-layer structure of an upper copper base and a lower stainless steel base, and the lifting of the base 15 is controlled by a motor; a sample holder 5 is located in the copper lining 2. A copper sample clamp 6 is provided at the top of the sample holder 5. A rod-shaped test sample 7 is vertically suspended inside the copper lining 2 by using the sample clamp 6. A ceramic material receiving cup 13 is arranged below the test sample 7;

[0044] The air inlet and exhaust system consists of a high-pressure oxygen pump, an air inlet pipe 3, an exhaust pipe 4, pneumatic valves, stop valves, pressure sensors, and a PLC; the air inlet pipe 3 and the exhaust pipe 4 are high-pressure-resistant pipelines, both inserted into the copper lining 2. The high-pressure oxygen pump is connected to the air inlet pipe 3 through a pneumatic valve, and the outlet pressure of the high-pressure oxygen pump is controlled through a pressure sensor. A stop valve is provided on the exhaust pipe 4, and the PLC is respectively connected to the high-pressure oxygen pump, the pressure sensor, the pneumatic valve, and the stop valve;

[0045] The heating system consists of a temperature control meter, a high-frequency induction heating power supply, heating copper bars, thermocouple electrodes 16, coaxial induction heating electrodes 17, and a high-frequency induction heating coil 9; the thermocouple electrodes 16 are welded in the middle of the test sample 7, the high-frequency induction heating coil 9 surrounds the test sample 7, and the high-frequency induction heating coil 9 is connected to the coaxial induction heating electrode 17; the input end of the temperature control meter is connected to the thermocouple electrodes 16, and the output end is connected to the high-frequency induction heating power supply; the high-frequency induction heating power supply is connected to the coaxial induction heating electrode 17 through the heating copper bars;

[0046] The ignition system includes a DC power supply and an ignition electrode 11; a NiCr resistance wire is connected between the positive and negative poles of the ignition electrode 11. The bottom of the test sample 7 is wound with an Al combustion promoter, and the NiCr resistance wire is wound outside the combustion promoter;

[0047] The recording system consists of a high-speed camera 10 and a sapphire observation window 8; the sapphire observation window 8 is arranged on the side wall of the pressure vessel, and the high-speed camera 10 is arranged opposite to the sapphire observation window 8;

[0048] The base 15 is provided with through holes for embedding the coaxial induction heating electrode 17, the ignition electrode 11, and the thermocouple electrodes 16. The coaxial induction heating electrode 17, the ignition electrode 11, and the thermocouple electrodes 16 and the through holes of the base 15 are sealed by a circumferential O-ring + butterfly ring, and the sealing material is fluororubber.

[0049] This embodiment is for testing the oxy-rich combustion resistance performance of GH4061 alloy under room temperature and pure oxygen (concentration > 99.5%) conditions. The high-temperature and high-pressure oxy-rich combustion test equipment is asFigure 1 As shown in the figure, the test process is as follows:

[0050] (1) Measure the original dimensions of the test sample 7. The measured diameter of the test sample 7 is between 3.17 - 3.19 mm, and the length is between 110 - 111 mm. Add an Al combustion aid to one end of the test sample 7, wind a NiCr resistance wire outside the combustion aid, and connect the positive and negative electrodes of the ignition electrode 11 to both ends of the resistance wire;

[0051] (2) Raise the base 15 and lock the stainless - steel pressure - resistant housing 1 and the base 15 with the slider locking device 14;

[0052] (3) Use the PLC control program to start the high - pressure oxygen pump, open the intake pneumatic valve, inject high - purity oxygen into the pressure vessel. After the pressure reaches 3.5 MPa, close the pneumatic valve, open the stop valve. After the pressure inside the pressure vessel drops to 0.1 MPa, close the stop valve. Repeat this process three times to evacuate the air inside the pressure vessel;

[0053] (4) Inject high - pressure oxygen into the pressure vessel, and the test pressures are 3.5 MPa, 4.5 MPa, 5 MPa, 7 MPa, 10 MPa, 15 MPa, 25 MPa respectively, and reach the predetermined test pressure;

[0054] (5) Start the DC power supply of the ignition system to generate a large current between the positive and negative electrodes of the ignition electrode 11 to ignite the NiCr wire and the combustion aid. The combustion aid drives the test sample 7 to burn, and the high - temperature molten droplets of the combustion reaction drop into the ceramic material - receiving cup 13;

[0055] (6) Start the high - speed camera 10 to shoot the combustion process. The combustion process of the test sample 7 at 3.5 MPa is as Figure 2 shown. At the beginning of the experiment, the NiCr resistance wire ignites the combustion aid as Figure 2 (a - b), and then the alloy test sample 7 is ignited, and the alloy combustion starts as Figure 2 (c); During the combustion of the test sample 7, a molten droplet is formed at the bottom as Figure 2 (c - h). There is a combustion interface between the test sample 7 and the molten droplet, which moves upward as the combustion proceeds as Figure 2 (c - g); At the same time, the droplet will gradually become larger until it drops under the action of gravity as Figure 2 (f - h). After the test sample 7 continuously undergoes the combustion - droplet - dropping cycle, it enters the late combustion stage as Figure 2 (i - k). The combustion interface no longer moves upward, the test sample 7 gradually cools from top to bottom, and finally the molten droplet remaining on the test sample 7 cools and solidifies as Figure 2 (k);

[0056] (7) After the combustion of the test sample 7 stops, open the stop valve. When the internal pressure of the pressure vessel drops to 0.1 MPa, lower the base 15, take out the test sample 7 and measure its remaining length. The remaining lengths of GH4061 alloy after combustion under different pressure conditions at room temperature in pure oxygen are as Figure 3 shown. According to ASTM-G124 standard, when the combustion length of the test sample 7 is greater than 30 mm, the alloy is considered a flammable material. Therefore, it can be known that under the condition of ignition at room temperature in 99.5% pure oxygen, the maximum non-combustion pressure of GH4061 alloy is about 5 MPa.

[0057] Example 2

[0058] Use the device used in Example 1 for testing.

[0059] This example is to test the oxy-fuel combustion resistance of a new type of superalloy under the conditions of high temperature, pure oxygen (concentration > 99.5%), and a pressure of 3.5 MPa. The test process is as follows:

[0060] (1) Measure the original dimensions of the test sample 7. The measured diameter of the test sample 7 is between 3.17 - 3.19 mm, and the length is between 110 - 111 mm. Add an Al combustion aid to one end of the test sample 7, and wind a NiCr resistance wire outside the combustion aid. Connect the positive and negative electrodes of the resistance wire to the positive and negative electrodes of the ignition electrode 11;

[0061] (2) Raise the base 15, and use the sliding slider locking device 14 to lock the stainless steel pressure-resistant housing 1 and the base 15;

[0062] (3) Use the PLC control program to start the high-pressure oxygen pump, open the intake pneumatic valve, inject high-purity oxygen into the internal of the pressure vessel. After the pressure reaches 3.5 MPa, close the pneumatic valve, open the stop valve. After the internal pressure of the pressure vessel drops to 0.1 MPa, close the stop valve. Repeat this process three times to evacuate the air inside the pressure vessel;

[0063] (4) Inject high-pressure oxygen into the internal of the pressure vessel, and the test pressure is 3.5 MPa and reach the predetermined test pressure;

[0064] (5) Start the high-frequency induction heating power supply, and use the high-frequency induction heating coil 9 to heat the test sample 7;

[0065] (6) After the test sample 7 is heated to the predetermined temperature (130 °C and 230 °C), start the DC power supply of the ignition system, generate a large current between the positive and negative electrodes of the ignition electrode 11 to ignite the NiCr resistance wire and the combustion aid, and the combustion aid drives the test sample 7 to burn. The high-temperature molten drops of the combustion reaction fall into the ceramic material receiving cup 13;

[0066] (7) Start the high-speed camera 10 to shoot the combustion process. The combustion process of the test sample 7 is similar to that in Example 1;

[0067] (8) After the combustion of the test sample 7 stops, turn off the high-frequency induction heating power supply, open the stop valve. After the internal pressure of the pressure vessel drops to 0.1 MPa, lower the base 15, take out the test sample 7 and measure its remaining length. The remaining lengths of the new superalloy after combustion under room temperature, pure oxygen, and different pressure conditions are as Figure 4 shown. According to the ASTM-G124 standard, for this new superalloy under 99.5% pure oxygen and 3.5 MPa pressure, the maximum non-combustion temperature is about 150 °C.

[0068] Example 3

[0069] Use the device used in Example 1 for testing.

[0070] This example is to test the oxy-fuel combustion resistance of GH4022 alloy under high temperature, high pressure, and pure oxygen (concentration > 99.5%). The test process is as follows:

[0071] (1) Measure the original dimensions of the test sample 7. The measured diameter of the test sample 7 is between 3.17 - 3.19 mm, and the length is between 110 - 111 mm. Add an Al combustion aid to one end of the test sample 7, wrap a NiCr resistance wire outside the combustion aid, and connect the two ends of the resistance wire to the positive and negative electrodes of the ignition electrode 11;

[0072] (2) Raise the base 15, and use the sliding slider locking device 14 to lock the stainless steel pressure-resistant housing 1 and the base 15;

[0073] (3) Use the PLC control program to start the high-pressure oxygen pump, open the intake pneumatic valve, inject high-purity oxygen into the internal of the pressure vessel. After the pressure reaches 3.5 MPa, close the pneumatic valve, open the stop valve. After the internal pressure of the pressure vessel drops to 0.1 MPa, close the stop valve. Repeat this process three times to evacuate the air inside the pressure vessel;

[0074] (4) Inject high-pressure oxygen into the internal of the pressure vessel, and the test pressure is 2.0 - 9.5 MPa and reach the predetermined test pressure;

[0075] (5) Start the high-frequency induction heating power supply, and use the high-frequency induction heating coil 9 to heat the test sample 7;

[0076] (6) After the test sample 7 is heated to the predetermined temperature (450 °C - 800 °C), start the DC power supply of the ignition system, generate a large current between the positive and negative electrodes of the ignition electrode 11 to ignite the NiCr resistance wire and the combustion aid, and the combustion aid drives the test sample 7 to burn. The high-temperature molten drops of the combustion reaction fall into the ceramic material receiving cup 13;

[0077] (7) Start the high-speed camera 10 to shoot the combustion process. The combustion process of the test sample 7 is similar to that in Example 1;

[0078] (8) After the combustion of the test sample 7 stops, turn off the high-frequency induction heating power supply, open the stop valve. After the internal pressure of the pressure vessel drops to 0.1 MPa, lower the base 15, take out the test sample 7 and measure its remaining length. The remaining length of the GH4022 alloy after combustion under high temperature, high pressure and pure oxygen conditions is as Figure 5 shown. The area above the solid line represents the temperature and pressure conditions under which the alloy is prone to combustion, and the area below the solid line represents the temperature and pressure conditions under which the alloy is not prone to combustion.

[0079] Matters not covered in this invention are well-known technologies.

[0080] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly. It should not be used to limit the protection scope of the present invention. Any effective changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A high temperature and high pressure oxygen-enriched combustion test equipment for metal materials, characterized by: The metal material high temperature and high pressure oxygen-enriched combustion test equipment comprises a pressure vessel, a sample holder (5), an air intake and exhaust system, a heating system, an ignition system, a recording system, a ceramic receiving cup (13), and a base (15); The pressure vessel is composed of an outer pressure-resistant shell (1) and an inner copper lining (2); the pressure vessel is arranged on a base (15), and the pressure vessel and the base (15) are sealed and connected; a sample holder (5) is arranged in the copper lining (2); a sample clamp (6) is arranged at the top of the sample holder (5); a rod-shaped test sample (7) is vertically suspended inside the copper lining (2) by the sample clamp (6); and a ceramic receiving cup (13) is arranged below the test sample (7); The intake and exhaust systems are composed of a high-pressure oxygen pump, an intake pipe (3), an exhaust pipe (4), a pneumatic valve, a stop valve, a pressure sensor, and a PLC; the intake pipe (3) and the exhaust pipe (4) are both inserted into the copper lining (2); the high-pressure oxygen pump is connected to the intake pipe (3) via a pneumatic valve, and the outlet pressure of the high-pressure oxygen pump is controlled by a pressure sensor; the exhaust pipe (4) is provided with a stop valve, and the PLC is respectively connected to the high-pressure oxygen pump, the pressure sensor, the pneumatic valve, and the stop valve; The heating system is composed of a temperature control meter, a high-frequency induction heating power supply, a heating copper bar, a thermocouple electrode (16), a coaxial induction heating electrode (17) and a high-frequency induction heating coil (9); the thermocouple electrode (16) is welded to the middle of the test sample (7), the high-frequency induction heating coil (9) surrounds the test sample (7), and the high-frequency induction heating coil (9) is connected to the coaxial induction heating electrode (17); the input end of the temperature control meter is connected to the thermocouple electrode (16), and the output end is connected to the high-frequency induction heating power supply; the high-frequency induction heating power supply and the coaxial induction heating electrode (17) are connected via the heating copper bar; The ignition system comprises a DC power supply and an ignition electrode (11), wherein a NiCr resistance wire is connected between the positive and negative electrodes of the ignition electrode (11); The recording system is composed of a high-speed camera (10) and a sapphire observation window (8); the sapphire observation window (8) is arranged on the side wall of the pressure container, and the high-speed camera (10) is arranged facing the sapphire observation window (8); The base (15) is provided with a through hole for embedding the coaxial induction heating electrode (17), the ignition electrode (11) and the thermocouple electrode (16).

2. The high temperature and high pressure oxygen-enriched combustion test equipment for metal materials according to claim 1, characterized in that: The metal material high temperature and high pressure oxygen-enriched combustion test equipment adopts a vertical bottom-opening form, and the base (15) is composed of a double-layer structure of an upper copper base and a lower stainless steel base, and the lifting and lowering of the base (15) is controlled by a motor.

3. The high temperature and high pressure oxygen-enriched combustion test equipment for metal materials according to claim 1, characterized in that: The pressure-resistant housing (1) and the base (15) are locked by a slider locking device (14), the sealing structure used is an end face seal, and the sealing material is a fluororubber sealing ring (12).

4. The high temperature and high pressure oxygen-enriched combustion test equipment for metal materials according to claim 1, characterized in that: The ignition electrode (11), the thermocouple electrode (16), the coaxial induction heating electrode (17) and the through hole of the base (15) are all sealed with a peripheral O-ring + butterfly ring, and the sealing material is fluororubber; the pressure-resistant shell (1) is a stainless steel part, and the sample clamp (6) is a pure copper part; the air inlet pipe (3) and the exhaust pipe (4) are both high-pressure resistant pipelines.

5. The high temperature and high pressure oxygen-enriched combustion test equipment for metal materials according to claim 1, characterized in that: The bottom of the test sample (7) is wound with a combustion aid, and the NiCr resistance wire is wound around the outside of the combustion aid.

6. The high temperature and high pressure oxygen-enriched combustion test equipment for metal materials according to claim 5, characterized in that: The combustion improver is Al or Mg.

7. The high temperature and high pressure oxygen-enriched combustion test equipment for metal materials according to claim 1, characterized in that: The thickness of the pressure-resistant shell (1) is 40 to 60 mm, and the thickness of the copper lining (2) is 10 to 15 mm.

8. The high temperature and high pressure oxygen-enriched combustion test method for metal materials according to any one of claims 1 to 7, characterized in that: The rod-shaped sample (7) is vertically suspended in a pressure vessel (1) filled with high-pressure oxygen-rich gas by means of a copper sample clamp (6); a combustion aid (Al, Mg metal) is wound around the bottom of the sample, and a resistance wire, specifically a NiCr resistance wire, is wound around the outside of the combustion aid; both ends of the resistance wire are connected to a positive and a negative ignition electrode (11); a large current generated by a DC power supply ignites the resistance wire and the combustion aid, and the combustion aid causes the sample to burn; and the material's resistance to oxygen-rich combustion is evaluated by measuring the burning length of the sample.

9. A metal material high temperature, high pressure, oxygen-enriched combustion test method according to claim 8, characterized in that: The method comprises the following steps: (1) Measure the original length of the sample, add a combustion aid, specifically Al and / or Mg, to one end, wrap a NiCr resistance wire around the outside of the combustion aid, and connect the positive and negative electrodes of the ignition electrode at both ends of the resistance wire; (2) Raise the base and slide the slider to lock the stainless steel pressure vessel and the base; (3) Using the PLC control program to start the oxygen pump, open the air intake valve, and inject high-purity oxygen into the pressure vessel. When the pressure reaches 3.5 MPa, close the air intake valve and open the air release valve. When the pressure drops to 0.1 MPa, close the air release valve. Repeat this process three times to exhaust the air inside the pressure vessel. (4) High-pressure oxygen is injected into the pressure vessel and reaches the predetermined test pressure; (5) starting the heating power supply and heating the sample using the induction coil; (6) After the sample is heated to a predetermined temperature, the high-speed camera recording system is started to prepare to capture the combustion process; (7) Start the ignition power supply, generate a large current between the positive and negative ignition electrodes to ignite the NiCr wire and the combustion aid, the combustion aid drives the sample to burn, and the high-temperature molten droplets from the combustion reaction fall into the ceramic receiving cup; (8) After the burning of the sample stops, open the vent valve. When the internal pressure of the pressure vessel drops to 0.1 MPa, lower the base, take out the test sample, and measure the remaining length of the sample.

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