High-temperature cooling testing device suitable for tantalum-tungsten alloy additive manufacturing pipe-rod-shaped coating structural member

Abstract

The utility model discloses a high-temperature cooling testing device suitable for a tantalum-tungsten alloy additive manufacturing pipe-rod-shaped coating structural member. The high-temperature cooling testing device comprises an electrode, a temperature rising and heating system, an electrode fastening device, a CO2 introducing system, a water cooling system, a two-color infrared temperature measuring system and a control system. According to the device, a direct-current electrifying heating mode is adopted, the structural part is heated and warmed, gas cooling is conducted on the interior of the structural part through the CO2 introducing system, meanwhile, water spraying cooling is conducted on the exterior of the structural part through the water cooling system, and the actual working condition can be truly simulated; the double-color infrared temperature measurement system is used for monitoring the temperature in real time and feeding back to the control system, and accurate temperature control is achieved. The device is compact in overall structure, safe and reliable to operate, high in testing precision and wide in applicability.

Description

Technical Field

[0001] This utility model belongs to the field of high-temperature testing technology for additive manufacturing materials, specifically relating to a high-temperature cooling testing device suitable for tantalum-tungsten alloy additive manufacturing of tubular and rod-shaped coated structural parts. Background Technology

[0002] Tantalum-tungsten alloy is a tantalum-based alloy with excellent high-temperature strength, corrosion resistance, oxidation resistance, and good machinability, making it widely applicable in aerospace, nuclear industry, and chemical industry. In recent years, with the development of additive manufacturing (i.e., 3D printing) technology, the application of tantalum-tungsten alloy additively manufactured parts, especially tubular and rod-shaped coated structures, has increased significantly. For example, in aerospace engine components (such as the high-temperature combustion chamber structure of scramjet engines), complex internal flow channel designs are often required. These channels typically require internal coating treatment to improve the component's resistance to high-temperature and oxidizing environments.

[0003] Because these components often operate under extremely harsh conditions during actual service, such as internal cavities being exposed to high-temperature gases or cooling media while the outer surfaces frequently experience rapid cooling, extremely high requirements are placed on the oxidation resistance and thermal shock resistance of the coatings used on these components. To ensure that these components can operate stably and reliably during service, it is usually necessary to conduct simulated tests on their oxidation resistance and thermal shock resistance under laboratory conditions to verify the actual effectiveness and lifespan of the coating.

[0004] However, existing high-temperature testing technologies have some limitations and shortcomings, making it difficult to realistically simulate the aforementioned complex working conditions. For example, most widely used high-temperature oxidation resistance testing devices currently employ simple resistance furnaces or induction furnaces to heat the samples, or use simple water cooling or air spray cooling, making it difficult to accurately control the sample temperature, especially to achieve a combined cooling condition of internal gas introduction and external water spray rapid cooling. Furthermore, traditional testing devices are typically designed for flat or sheet-like samples. For tubular or rod-shaped structures manufactured from tantalum-tungsten alloy additives, especially samples with internal flow channels or cavities, existing technologies struggle to effectively simulate internal cooling.

[0005] Furthermore, traditional heating methods typically employ alternating current (AC) heating. Due to the periodic variations in AC current, large temperature fluctuations and unstable control are easily caused during long-term high-temperature testing, thus affecting the accuracy of coating performance testing. Traditional temperature measurement methods usually utilize monochromatic infrared thermometers or thermocouples. Monochromatic infrared thermometers are susceptible to the effects of flue gas, water vapor, and changes in the emissivity of the sample surface, while thermocouple temperature measurements may be damaged by contact with high-temperature samples or experience measurement lag, both resulting in insufficient measurement accuracy and reliability.

[0006] For the reasons mentioned above, there is an urgent need to develop a new testing device that can simultaneously introduce cooling gas into the interior of tubular and rod-shaped coated structural parts and spray water for rapid cooling from the outside, with high temperature control accuracy and advanced temperature measurement methods. This device can better simulate the actual complex service environment of tantalum-tungsten alloy additive manufacturing parts, thereby more accurately evaluating the oxidation resistance and thermal shock resistance of the coating.

[0007] This invention is a novel high-temperature cooling testing device proposed to address the aforementioned technical needs, aiming to overcome the shortcomings of existing technologies, more realistically simulate the actual working environment of tantalum-tungsten alloy additive manufacturing of tubular and rod-shaped coated structural parts, and improve the accuracy and reliability of test results. Utility Model Content

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a high-temperature cooling testing device suitable for additive manufacturing of tubular and rod-shaped coated structural parts from tantalum-tungsten alloys. This device has a compact structure and can simultaneously achieve internal cooling gas introduction and external water spray rapid cooling of the sample. The testing process is stable and reliable, with high temperature measurement accuracy.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A high-temperature cooling testing device suitable for additive manufacturing of tubular and rod-shaped coated structural parts from tantalum-tungsten alloys, characterized in that it comprises:

[0011] Left and right electrodes, the two electrodes are arranged opposite each other and used to clamp the two ends of the tubular rod-shaped coated structure;

[0012] The heating system includes an AC power supply, a step-down transformer, and a rectifier connected in sequence. The output end of the rectifier is connected to the left and right electrodes, so that the tubular rod-shaped coated structure is energized and heated as a heating element.

[0013] An electrode fastening device includes an electrode body and an electrode clamping block. The opposing surfaces of the electrode body and the electrode clamping block are provided with several pairs of slots of different diameters for detachably clamping and fixing the two ends of the tube-shaped coated structure between the electrodes.

[0014] The CO2 introduction system includes a CO2 gas source, a constant pressure flow controller, and a conduit. One end of the conduit is connected to the constant pressure flow controller, and the other end is sealed and connected to the inner cavity of the tube-shaped coated structure, for introducing CO2 gas into the tube-shaped coated structure for cooling.

[0015] The water cooling system includes a cooling water circuit, a solenoid valve, and a spray head. The spray head is located outside the tubular coated structure and connected to the cooling water circuit. The solenoid valve is installed on the cooling water circuit to control the spraying of cooling water.

[0016] An infrared temperature measurement system includes a dual-color infrared thermometer, which is disposed on the outside of the tubular-rod-shaped coated structure and aligned with the middle surface of the tubular-rod-shaped coated structure.

[0017] The control system is electrically connected to the heating system, the CO2 supply system, and the water cooling system, respectively. It is used to control the heating power of the heating system based on the temperature signal fed back by the dual-color infrared thermometer, and to control the water cooling system and the CO2 supply system to operate automatically according to a preset program.

[0018] Furthermore, the step-down transformer is a low-voltage, high-current transformer, comprising a primary coil and a secondary coil. The primary coil is connected to a 380V AC power supply, and the number of turns of the secondary coil is set to output a voltage not exceeding 10V. The rectifier is a bridge rectifier, with its AC input terminal connected to the secondary coil of the step-down transformer and its DC output terminal connected to the left and right electrodes.

[0019] Furthermore, the electrode body and the electrode clamp are detachably connected by upper and lower fastening screws.

[0020] Furthermore, a sealing interface is provided at the connection between the conduit and the inner cavity of the tube-shaped coated structure.

[0021] Furthermore, the water cooling system includes a programmable logic controller (PLC) electrically connected to the solenoid valve to control the opening and closing of the solenoid valve.

[0022] Furthermore, the water cooling system also includes a water pressure sensor, which is installed on the cooling water circuit and electrically connected to the programmable logic controller (PLC), which is electrically connected to the heating system.

[0023] Furthermore, the input end of the constant pressure flow controller is connected to the outlet of the CO2 gas source, and the output end is connected to a conduit.

[0024] The advantages of this utility model over the prior art are as follows:

[0025] For the first time, a test combining internal gas cooling and external water spray rapid cooling was successfully conducted on a tubular or rod-shaped coated structural component.

[0026] The use of DC heating improves the stability of temperature control during the testing process;

[0027] The use of dual-color infrared temperature measurement technology improves the accuracy of high-temperature measurements and ensures the reliability of test data.

[0028] Each system operates in coordination through the control system, thereby automating the testing process. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model;

[0030] Figure 2 This is a schematic diagram of the infrared temperature measurement system in the device of this utility model;

[0031] Figure 3 This is a schematic diagram of the heating system in the device of this utility model;

[0032] Figure 4 This is a schematic diagram of the water-cooled testing system in the device of this utility model;

[0033] Figure 5 This is a schematic diagram illustrating the principle of CO2 being introduced into the cooling system in the device of this utility model;

[0034] Figure 6 This is a schematic diagram of the heating electrode fastening device of the present invention (with clamping hole and groove structure adapted to samples of different diameters).

[0035] Among them, 1: dual-color infrared thermometer; 2: left electrode; 3: tubular rod-shaped coated structure; 4: right electrode; 5: conduit; 6: CO2 gas source; 7: constant pressure flow controller; 8: sealed interface; 9: rectifier; 10: step-down transformer; 11: AC power supply; 12: programmable logic controller; 13: heating system; 14: solenoid valve; 15: water pressure sensor; 16: cooling water circuit; 17: spray head; 18: upper fastening screw; 19: lower fastening screw; 20: electrode body; 21: electrode clamp; 22: 4mm tubular rod-shaped coated structure hole slot; 23: 6mm tubular rod-shaped coated structure hole slot; 24: 8mm tubular rod-shaped coated structure hole slot; 25: 10mm tubular rod-shaped coated structure hole slot. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-6 The device structure and testing method of this utility model will be further described, but this utility model is not limited to these embodiments.

[0037] The high-temperature cooling test device provided in this embodiment for additive manufacturing of tubular rod-shaped coated structural parts (3) of tantalum-tungsten alloy includes: left and right electrodes (2, 4), electrode body (20), heating system, CO2 introduction system, water cooling system, infrared temperature measurement system (1) and control system.

[0038] (a) Sample installation

[0039] First, the two ends of the tubular coated structure (3) to be tested are clamped between the left and right electrodes (2, 4) respectively. The electrode body (20) and the slot (22) on the electrode clamp (21) are fixedly connected by upper and lower fastening screws (18, 19) to ensure that the sample is clamped stably and has good conductivity. Then, the conduit (5) for introducing CO2 into the system is connected to the inner cavity of the sample through the sealed interface (8) to achieve internal cooling of the sample.

[0040] The dual-color infrared thermometer (1) is installed in the middle of the outer side of the sample to measure the outer surface temperature of the sample in real time.

[0041] (II) Start-up and operation of the device

[0042] After the sample is installed, start each subsystem of the device:

[0043] The heating system is started. The AC power supply (11) is stepped down by the step-down transformer (10) and then rectified into DC power by the rectifier (9). The sample tube rod-shaped coating structure (3) is heated by the left and right electrodes (2, 4) so ​​that the sample temperature rises to the predetermined test temperature.

[0044] When the outer surface temperature of the tubular coated structure (3) reaches the set value and stabilizes, the CO2 supply system is turned on. The cooling gas in the CO2 gas source (6) is regulated by the constant pressure flow controller (7) and then enters the sample cavity through the conduit (5) to achieve internal cooling.

[0045] At the same time, the water cooling system is started, and the PLC (12) of the control system opens the solenoid valve (14). Cooling water is sprayed from the spray head (17) through the cooling water path (16) to the outer surface of the tube-shaped coated structure (3) to cool it, forming an external rapid cooling environment.

[0046] During the operation of the device, the PLC (12) adjusts the heating power according to the temperature data fed back in real time by the dual-color infrared thermometer (1), and automatically coordinates and controls the start and stop of CO2 cooling gas and water spray cooling.

[0047] (III) Data Collection and Recording

[0048] During the experiment, the control system collected real-time data on parameters such as the temperature of the sample surface, CO2 gas flow rate, and water pressure of the water cooling system. This data was automatically recorded and saved by the control system's acquisition unit for subsequent analysis and evaluation.

[0049] (iv) Applicability of different types of test specimens

[0050] This device is highly adaptable to tubular and rod-shaped coated structural components (3) with different diameters and wall thicknesses, requiring only:

[0051] Replace the corresponding diameter slots in the electrode body (20) and electrode clamp (21) according to the sample size to accommodate samples of different sizes; adjust the CO2 gas flow rate according to the sample diameter to meet the cooling requirements of different samples.

[0052] Adjust the heating time and cooling duration according to the sample wall thickness to ensure that the entire sample achieves uniform and effective temperature control and cooling effect.

[0053] With the above adjustments, high-temperature cooling performance testing of various specifications of tubular and rod-shaped coated structural components (3) can be achieved, ensuring the wide applicability and testing accuracy of the device.

Claims

1. A high temperature cooling test device suitable for additive manufacturing of tubular rod-shaped coated structural components (3) from tantalum-tungsten alloys, characterized in that The left and right electrodes (2, 4) are oppositely arranged and used for clamping the two ends of the pipe rod-shaped coating structure (3); the temperature rising heating system (13) comprises an alternating current power supply (11), a step-down transformer (10) and a rectifier (9) connected in sequence, the output end of the rectifier (9) is connected to the left and right electrodes (2, 4), and the pipe rod-shaped coating structure (3) is used as a heating body to be electrified and heated; the electrode fastening device comprises an electrode main body (20) and an electrode clamping block (21), the opposite surfaces of the electrode main body (20) and the electrode clamping block (21) are provided with a plurality of pairs of groove holes (22, 23, 24, 25) with different diameters, which are used for detachably clamping and fixing the two ends of the pipe rod-shaped coating structure (3) between the electrodes (2, 4); the CO2 input system comprises a CO2 gas source (6), a constant pressure flow controller (7) and a conduit (5), one end of the conduit (5) is connected to the constant pressure flow controller (7), the other end is in sealed communication with the inner cavity of the pipe rod-shaped coating structure (3), and the CO2 input system is used for inputting CO2 gas into the pipe rod-shaped coating structure (3) for cooling; the water cooling system comprises a cooling water path (16), an electromagnetic valve (14) and a spray head (17), the spray head (17) is arranged outside the pipe rod-shaped coating structure (3) and connected to the cooling water path (16), and the electromagnetic valve (14) is installed on the cooling water path (16) to control the spraying of the cooling water; the infrared temperature measuring system comprises a double-color infrared temperature measuring instrument (1), and the double-color infrared temperature measuring instrument (1) is arranged outside the pipe rod-shaped coating structure (3) and aligned with the middle surface of the pipe rod-shaped coating structure (3); the control system is electrically connected with the temperature rising heating system, the CO2 input system and the water cooling system respectively, is used for controlling the heating power of the temperature rising heating system according to the temperature signal fed back by the double-color infrared temperature measuring instrument (1), and controlling the water cooling system and the CO2 input system to automatically operate according to a preset program. The step-down transformer (10) is a low-voltage and large-current transformer, comprising a primary coil and a secondary coil, the primary coil is connected to the 380V alternating current power supply (11), and the number of turns of the secondary coil is set to be not higher than 10V; the rectifier (9) is a bridge rectifier, the alternating current input end of the bridge rectifier is connected to the secondary coil of the step-down transformer (10), and the direct current output end is connected to the left and right electrodes (2, 4). The electrode main body (20) and the electrode clamping block (21) are detachably connected through upper and lower fastening screws (18, 19). A sealing interface (8) is arranged at the connection between the conduit (5) and the inner cavity of the pipe rod-shaped coating structure (3). The control system comprises a programmable logic controller (12), the programmable logic controller (12) is electrically connected to the electromagnetic valve (14) to control the opening and closing of the electromagnetic valve (14). The water cooling system further comprises a water pressure sensor (15), the water pressure sensor (15) is installed on the cooling water path (16) and electrically connected to the programmable logic controller (12), and the programmable logic controller (12) is electrically connected to the temperature rising heating system (13). ​ ​ 2. The test device of claim 1, wherein, ​ 3. The test device of claim 1, wherein, ​ 4. The test device of claim 1, wherein, ​ 5. The test device of claim 1, wherein, ​ 6. The test device of claim 5, wherein, ​ 7. The test device of claim 1, wherein, The input end of the constant pressure flow controller (7) is connected with the outlet of the CO2 gas source (6), and the output end is connected with the conduit (5).

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