Jig for creating non-oxidizing environment, and mechanical high-temperature physical property testing apparatus and method using same

Abstract

The present invention relates to: a jig for creating a non-oxidizing environment; and a mechanical high-temperature physical property testing apparatus and method using same. The jig for creating a non-oxidizing environment and the mechanical high-temperature physical property testing apparatus using same of the present invention comprise: upper and lower connection members disposed on upper and lower portions, respectively; a weight disposed to surround the upper connection member to fix a specimen; an air-cooled cooling engine for air-cooling a tester; a cover part installed at the upper and lower portions; and an inert gas supply line at the lower end of a high-temperature quartz pipe and through which inert gas lighter than air is supplied, wherein the cover part made of a heat-resistant lightweight alloy has a rubber sealing installed between an outer cover and an inner cover, a furnace is installed outside the high-temperature quartz pipe to be movable from Fmin (lowest point) to Fmax (highest point), and the furnace is moved to Fmax to uniformly heat the high-temperature quartz pipe.

Description

Non-oxidizing environment creation jig and mechanical high-temperature property test device and test method using the same

[0001] The present invention relates to a high-temperature property evaluation device, and more particularly, to a mechanical high-temperature property evaluation jig and an evaluation method using the same under conditions of a non-oxidizing environment for precisely measuring the displacement of a test piece according to temperature and load.

[0002] Regarding a high-temperature property evaluation device, a high-temperature property evaluation device for precisely measuring the displacement of a test piece according to temperature and load and an evaluation method using the same are disclosed in Korean Patent Publication No. 10-2018-0064844.

[0003] The high-temperature property evaluation device includes a fixing unit (10) for fixing a test piece, a heating unit (20) arranged in parallel and spaced apart from each other on both sides of the test piece (P), and a heat source unit (30) connected to the heating unit (20) and supplying energy thereto.

[0004] The heating unit (20) is configured such that multiple units are repeatedly installed in an arc at a set angle on the heat source unit (30).

[0005] A high-temperature material property test device for evaluating the material properties of a specimen, which detects the size of the load applied to the specimen, the temperature, and the displacement of the specimen according to the load applied to the specimen through a load cell, a thermocouple, and a micro-displacement device, amplifies the values, transmits them to a PLC (Programmable Logic Controller), and then converts the load values, etc. through a servo motor and driver according to the set values, thereby precisely controlling and measuring the specimen regardless of the size of the specimen through feedback control, is disclosed in Korean Patent Publication No. 10-1104629.

[0006] The high-temperature property test device includes a load frame body (100) composed of a load cell frame (110), a main body frame (120), a lower frame (130), and a frame support shaft (140) for supporting an internal mechanism required for measuring the properties of a specimen (10), and a high-temperature chamber (200) located on the upper portion of the load frame body (100) and in which a specimen (10) is mounted.

[0007] The high temperature chamber (200) is equipped with a sealed internal unit (210) for maintaining a temperature set through a computer, a heating heater (220) for heating a specimen (10) to a set temperature, and upper and lower specimen holders (260, 270) for fixing the specimen (10).

[0008] And it is composed of an extensometer (230) for measuring the displacement value of a specimen (10) having a parallel part (P) of 6.25 mm or less attached to upper and lower specimen holders (260, 270), a load cell rod (280) formed inside an upper connecting member (240) and connected to a load cell (300); and a servo motor rod (290) formed inside a lower connecting member (250) and connected to a servo motor (400).

[0009] [Prior Art Literature]

[0010] [Patent Document]

[0011] (Patent Document 1) Korean Patent Publication No. 10-2018-0064844

[0012] (Patent Document 2) Korean Patent Publication No. 10-1104629

[0013] Thermal material tests such as compression, tensile, and creep performed in a high-temperature environment are useful methods for evaluating the high-temperature properties of materials and can measure various changes in properties such as load, Young's modulus, strain, and rupture time depending on temperature.

[0014] Measuring mechanical properties in high-temperature environments is essential, especially for materials expected to be exposed to high-temperature environments.

[0015] However, when testing in a high-temperature environment, the cross-sectional area may decrease due to oxidation of the material surface or the oxidation reaction between the material surface and the jig may produce results that differ from the high-temperature properties of the actual material.

[0016] In particular, in the case of high-temperature creep tests and high-temperature fatigue tests, an extreme oxidation layer is formed on the material surface due to long-term exposure to high-temperature environments.

[0017] Meanwhile, high-temperature properties also vary depending on the material. Tungsten rapidly forms tungsten oxide at high temperatures, limiting the ability to measure material properties in high-temperature environments.

[0018] To solve the above problems, there are methods for creating a vacuum in a high-temperature environment or forming a thin film, but the vacuum-forming system is expensive and prone to leaks, and the film layer formed using spray coating has the problem of its soundness deteriorating when exposed for a long period of time.

[0019] The non-oxidizing environment creation jig of the present invention and the mechanical high-temperature property test device utilizing the same include upper and lower connecting members respectively arranged at the upper and lower portions, a weight arranged to surround the upper connecting member and fix a specimen, an air-cooling cooling system for cooling the tester, a cover part installed at the upper and lower portions, and an inert gas supply line for supplying an inert gas lighter than air to the lower portion of a high-temperature quartz tube.

[0020] The cover part of the present invention, which is composed of a heat-resistant lightweight alloy, is configured such that a rubber seal is installed between the outer cover and the inner cover.

[0021] The present invention has a configuration in which a furnace is installed outside the high-temperature quartz tube so as to be able to move from Fmin (lowest point) to Fmax (highest point), and the furnace moves to Fmax so as to uniformly heat the high-temperature quartz tube.

[0022] A specimen mounted between an upper specimen holder and a lower specimen holder is placed in a high-temperature quartz tube of the present invention, and the specimen is configured to be fixed to an upper specimen mounting portion provided in the upper specimen holder portion (50) and a lower specimen mounting portion provided in the lower specimen holder portion, respectively.

[0023] The weight of the present invention is configured to secure the cover while simultaneously pressurizing the rubber seal to increase the sealing between the cover and the high-temperature quartz tube.

[0024] Since the jig can be modified and applied depending on the size and conditions of the mechanical property tester, there are no major restrictions on the model of the tester and furnace.

[0025] Low cost inert gases and jig unit prices allow for inexpensive non-oxidizing environments.

[0026] Because it is a system independent of the furnace, unlike vacuum furnaces that require furnace cooling, it can achieve the target cooling rate by performing air cooling or accelerated air cooling using an inert gas.

[0027] A non-oxidizing environment creation jig and a high-temperature mechanical property testing device and test method utilizing it can minimize high-temperature oxidation and derive quantitative mechanical properties. This allows for lifespan assessments of high-temperature equipment used in power plants and other high-temperature environments, thereby reducing maintenance and replacement costs.

[0028] In addition, it is possible to preemptively derive materials usable in innovative small modular reactors (i-SMR) by evaluating the soundness in high-temperature environments of commercial steels (high-chromium steel, austenitic stainless steel, Alloy 800H, Alloy 617, etc.) that are scheduled to be used in the recently developed innovative small modular reactors (i-SMR) and evaluating the high-temperature mechanical properties of materials currently under development.

[0029] Furthermore, as the deterioration of currently operating nuclear power plants is becoming more pronounced and the selection of materials for the design of new nuclear power plants is becoming a major economic factor, the demand for high-temperature mechanical property evaluation of nuclear power materials is expected to be enormous in the future.

[0030] Figure 1(a) illustrates a conventional device for evaluating high-temperature properties.

[0031] Figure 1(b) shows a high-temperature physical property test device for evaluating the physical properties of a conventional specimen.

[0032] Figure 2 illustrates a non-oxidizing environment creation jig according to the present invention and a mechanical high-temperature property test device utilizing the same.

[0033] Figure 3 illustrates the configuration of a cover part coupled to a load cell on the top of a heat-resistant quartz tube according to the present invention.

[0034] Hereinafter, a preferred embodiment of the present invention will be described in more detail with reference to the attached drawings.

[0035] Figure 1(a) illustrates a conventional device for evaluating high-temperature properties.

[0036] A high-temperature property evaluation device including a fixing unit (10) for fixing a test piece, a heating unit (20) spaced apart and arranged in parallel on both sides of the test piece (P), and a heat source unit (30) connected to the heating unit (20) for supplying energy, is described in Korean Patent Publication No. 10-2018-0064844 for precisely measuring the displacement of the test piece according to temperature and load.

[0037] Figure 1(b) shows a high-temperature physical property test device for evaluating the physical properties of a conventional specimen.

[0038] Korean Patent Publication No. 10-1104629 describes a high-temperature material property test device for evaluating the material properties of a specimen by detecting the size of the load applied to the specimen, the temperature, and the displacement of the specimen according to the load applied to the specimen through a load cell, a thermocouple, and a micro-displacement device, amplifying the data and transmitting it to a PLC device, and then converting the load value, etc. through a servo motor and driver according to the set value, thereby precisely controlling the specimen regardless of the size of the specimen and measuring the displacement through feedback control.

[0039] Figure 2 illustrates a non-oxidizing environment creation jig according to the present invention and a mechanical high-temperature property test device utilizing the same.

[0040] A non-oxidizing environment creation jig and a mechanical high-temperature property test device (100) utilizing the same include an upper connecting member (10) and a lower connecting member (60) respectively arranged at the upper and lower portions, a weight (20) arranged to surround the upper connecting member (10) and secure a specimen (70), an air-cooling cooling system (30) for cooling the tester, a cover (40) installed at the upper and lower portions, a high-temperature quartz tube (80), and an inert gas supply line (90) for supplying an inert gas lighter than air to the lower portion of the high-temperature quartz tube (80).

[0041] The cover (40) is made of a heat-resistant lightweight alloy, and a rubber seal (43) is installed between the outer cover (41) and the inner cover (42), and a furnace is installed outside the high-temperature quartz tube (80) so as to be able to move from Fmin (lowest point) to Fmax (highest point), and the furnace is configured to move to Fmax so as to uniformly heat the high-temperature quartz tube (80).

[0042] A non-oxidizing environment creation jig and a mechanical high-temperature property test device (100) utilizing the same are equipped with an upper connecting member (10) placed on the upper side, a sealing weight (20) placed around the upper connecting member (10), an air-cooled cooling system (30), and a cover (40) installed on the upper and lower sides.

[0043] Upper and lower specimen holders (50, 60) capable of mounting a specimen (70) are provided, and the specimen (70) is configured to be fixed to the upper and specimen mounting parts (51, 61) provided in the upper and lower specimen holders (50, 60).

[0044] A specimen (70) mounted between an upper specimen holder (50) and a lower specimen holder (60) is placed inside a high-temperature quartz tube (80).

[0045] The configuration is such that an inert gas is supplied around the lower specimen holder (60) at the bottom of a high-temperature quartz tube (80).

[0046] It is configured so that a furnace installed on the outside of a high-temperature quartz tube (80) can be moved from Fmin (lowest point) to Fmax (highest point).

[0047] It is possible to move the furnace from Fmin to Fmax, and the configuration is such that it is possible to uniformly heat the high-temperature quartz tube (80) by moving the furnace to Fmax.

[0048] A non-oxidizing environment creation jig and a mechanical high-temperature property test device (100) utilizing the same include an upper connecting member (10) and a lower connecting member (60) respectively arranged at the upper and lower portions, a weight (20) arranged to surround the upper connecting member (10) and secure a specimen (70), an air-cooling cooling system (30) for cooling the tester, a cover (40) installed at the upper and lower portions, a high-temperature quartz tube (80), and an inert gas supply line (90) for supplying an inert gas lighter than air to the lower portion of the high-temperature quartz tube (80).

[0049] The cover (40) is made of a heat-resistant lightweight alloy, and a rubber seal (43) is installed between the outer cover (41) and the inner cover (42), and a furnace is installed outside the high-temperature quartz tube (80) so as to be able to move from Fmin (lowest point) to Fmax (highest point), and the furnace is configured to move to Fmax so as to uniformly heat the high-temperature quartz tube (80).

[0050] Since the air-cooled cooling system (30) is a system independent of the furnace, unlike a vacuum furnace that must be furnace-cooled, it can achieve the target cooling speed by performing accelerated air cooling using air cooling or an inert gas.

[0051] The role of the sealing weight (20) is to secure the upper cover (40) made of a heat-resistant lightweight alloy and at the same time pressurize the rubber seal (43) to increase the sealing between the cover (40) and the high-temperature quartz tube (80).

[0052] The bottom of the high-temperature quartz tube (80) is equipped with an inert gas supply line (90) through which an inert gas lighter than air is supplied.

[0053] The high temperature test jig includes a line (90) for supplying an inert gas lighter than air to the bottom of a high temperature quartz tube (80), and is configured to include a coil-type inert gas supply line so that the inert gas can be free-heated at the bottom of the furnace.

[0054] Since the degree of oxidation of inert gases varies depending on the flow, the flow is optimized for the size of the test piece and high-temperature quartz tube, and the furnace is installed after sufficient time.

[0055] Figure 3 illustrates the configuration of a cover part coupled to a load cell on the top of a heat-resistant quartz tube according to the present invention.

[0056] The jig is composed of a heat-resistant, high-temperature quartz tube to enable observation of the test piece during the test, and the top of the high-temperature quartz tube is configured to include a rubber seal to prevent leakage of inert gas that may occur between the rods connected to the existing load cell.

[0057] The cover part (40) has a rubber seal (43) installed between the outer cover (41) and the inner cover (42).

[0058] The outer cover (41) and the inner cover (42) are made of a heat-resistant, lightweight alloy, for example, a magnesium alloy.

[0059] The outer cover (41) has a circular groove (45) into which a high-temperature quartz tube (80) can be installed.

[0060] The inner cover (42) is provided with a circular through hole (46) through which a high-temperature quartz tube (80) can pass.

[0061] It has a configuration in which a rubber seal (43) is installed between the outer cover (41) and the inner cover (42) and joined by a fastening element (44).

[0062] The outer cover (41) is provided with a through hole (46) through which a fastening element (44) can be installed by penetrating, and the inner cover (42) is formed with a fastening portion (47) for fastening by which the fastening element (44) is coupled.

[0063] A bolt is used as a fastening element (44), and the fastening portion (47) for joining is formed as a nut portion.

[0064] Since the cover part (40) is configured to be used equally on the upper and lower sides, it is not described separately as an upper cover part and a lower cover part.

[0065] A single-axis testing machine for measuring mechanical properties may include a high-temperature mechanical property jig that creates a non-oxidizing environment using, for example, Instron 4204, 5569, and a high-temperature mechanical property tester including the same.

[0066] A high-temperature mechanical property jig for creating a non-oxidizing environment and a high-temperature mechanical property test including the same can be performed as follows.

[0067] Mount the test specimen on the mechanical properties test device.

[0068] The high-temperature quartz tube at the top is positioned to the test piece and the nozzle at the bottom that contains the inert gas.

[0069] Since the degree of oxidation of inert gases varies depending on the flow, set the flow optimized for the size of the test piece and quartz and mount the furnace after sufficient time.

[0070] The temperature of the test piece and the furnace are measured using a thermocouple with which the temperature of the test piece and the temperature of the furnace are in thermal equilibrium, and the time of thermal equilibrium is determined.

[0071] When the temperature of the test piece reaches thermal equilibrium with the temperature of the furnace, the high-temperature property test begins.

[0072] Although the present invention has been described in detail through representative examples above, those skilled in the art will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention.

[0073] Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by all changes or modifications derived from the patent claims as well as the equivalent concepts of the patent claims.

[0074] [Explanation of symbols]

[0075] 10: Upper connecting member

[0076] 20: Weight

[0077] 30: Air-cooled refrigeration engine

[0078] 40: Cover

[0079] Psalm 70

[0080] 50: Upper specimen holder

[0081] 60: Upper specimen holder

[0082] 80: High-temperature quartz tube

[0083] 90: Inert gas supply line

[0084] 100: Mechanical high temperature property test device

Claims

1. A non-oxidizing environment creation jig and a mechanical high-temperature property test device (100) utilizing the same, Upper connecting member (10) and lower connecting member (60) respectively arranged at the upper and lower portions, A weight (20) that is arranged around the upper connecting member (10) and fixes the specimen (70), Air-cooled cooling engine (30) that cools the tester, Cover parts (40) installed at the top and bottom, High temperature quartz tube (80) and The bottom of the high-temperature quartz tube (80) includes an inert gas supply line (90) through which an inert gas lighter than air is supplied. The cover part (40) composed of a heat-resistant lightweight alloy has a rubber seal (43) installed between the outer cover (41) and the inner cover (42). Outside the high-temperature quartz tube (80), a furnace is installed so that it can move from Fmin (lowest point) to Fmax (highest point). A non-oxidizing environment creation jig characterized in that the furnace can move to Fmax to uniformly heat a high-temperature quartz tube (80) and a mechanical high-temperature property test device utilizing the same.

2. In paragraph 1, A specimen (70) is placed between the upper specimen holder (50) and the lower specimen holder (60) in a high-temperature quartz tube (80). The specimen (70) is respectively attached to the upper specimen mounting portion (51) provided in the upper specimen holder portion (50) and the lower specimen mounting portion (61) provided in the lower specimen holder portion (60). A non-oxidizing environment creation jig and a mechanical high-temperature property test device utilizing the same, characterized in that the weight (20) secures the cover (40) and simultaneously pressurizes the rubber seal (43) to increase the sealing between the cover (40) and the high-temperature quartz tube (80).

3. In paragraph 2, The outer cover (41) has a circular groove (45) in which a high-temperature quartz tube (80) can be installed. The inner cover (42) is provided with a circular through hole (46) through which a high-temperature quartz tube (80) can pass. A configuration in which a rubber seal (43) is installed between the outer cover (41) and the inner cover (42) and joined with a fastening element (44), The outer cover (41) is provided with a through hole (46) through which a fastening element (44) can be installed. A non-oxidizing environment creation jig characterized in that a fastening member (47) for fastening is formed on the inner cover (42) to which a fastening element (44) is fastened, and a mechanical high-temperature property test device utilizing the same.

4. In paragraph 3, A non-oxidizing environment creation jig and a mechanical high-temperature property test device utilizing the same, characterized in that an inert gas supply line (90) that supplies an inert gas lighter than air from the bottom of a high-temperature quartz tube (80) is supplied to the high-temperature quartz tube (80) in a spiral shape around the lower specimen holder (60).

5. A mechanical high-temperature property test method using a non-oxidizing environment creation jig according to any one of clauses 1 to 4 and a mechanical high-temperature property test device (100) utilizing the same, A test piece is mounted on a non-oxidizing environment creation jig and a mechanical high-temperature property test device utilizing the jig, The high-temperature quartz tube at the top is positioned to the nozzle where the test piece and the inert gas enter at the bottom. Since the degree of oxidation of inert gases varies depending on the flow, set the flow optimized for the size of the test piece and quartz and install the furnace after sufficient time. The temperature of the test piece and the furnace are measured using a thermocouple with which the temperature of the test piece and the temperature of the furnace are in thermal equilibrium, and the time of thermal equilibrium is determined. A mechanical high-temperature property test method using a mechanical high-temperature property test device characterized in that a high-temperature property test is started when the temperature of the test piece reaches thermal equilibrium with the temperature of the furnace.

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