Performance evaluation method of Alnico alloy under irradiation and temperature field conditions

Abstract

A method for evaluating the performance of Alnico alloys under irradiation and temperature field conditions relates to a method for evaluating the performance of magnetic alloys. The present invention aims to solve the problem that the engineering methods of the prior art cannot evaluate the performance changes of Alnico magnetic alloys due to the influence of the coupling factors of irradiation and temperature field on the materials under a nuclear environment. The sample of the present invention is placed in a heater, and the sample and the heater are placed in a vacuum chamber. The performance of the Alnico magnetic alloy is tested by implementing a working condition environment in which irradiation and temperature act together through a temperature measurement and control system. The accuracy of the evaluation of the service stability of Alnico alloy materials under a nuclear environment is improved. The present invention is used for the performance evaluation of permanent magnet alloys.

Description

Technical Field

[0001] The invention relates to a permanent magnet alloy performance evaluation method, in particular to an Alnico alloy performance evaluation method under irradiation and temperature field conditions, and belongs to the technical field of magnetic alloys. Background Art

[0002] Alnico magnetic alloy is a material widely used in nuclear power instruments, particle accelerators, synchrotron radiation devices and other fields. When serving in a nuclear power plant environment, Alnico magnetic alloy is usually under high temperature conditions and accompanied by a variety of irradiation environments, such as particle irradiation, neutron irradiation, and radiation irradiation. In this case, the service stability of Alnico magnetic alloy is directly related to the normal operation and use of the instrument.

[0003] At present, most of the studies on the performance changes of Alnico magnetic alloys only consider the influence of a single factor, namely temperature stability and radiation resistance. However, since Alnico magnetic alloys are mainly affected by the composite environment in the actual nuclear environment, namely the coupling factors of radiation and temperature field, it is impossible to accurately evaluate the law of performance changes by only exploring the influence of a single factor. It can be seen that studying an engineering method that considers the influence of the real working environment on the performance changes of Alnico magnetic alloys is an urgent problem to be solved in the performance evaluation of Alnico magnetic alloys. It has also become the basic demand of this research field, which is of great significance to basic science and nuclear industry applications.

[0004] In summary, the existing engineering methods have the problem of inaccurate evaluation of the service stability of Alnico magnetic alloys in actual nuclear environments. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the engineering method of the prior art is not accurate enough in evaluating the service stability of Alnico magnetic alloy in an actual nuclear environment, and further provide a performance evaluation method of Alnico alloy under irradiation and temperature field conditions.

[0006] The technical solution of the present invention is:

[0007] The method for evaluating the performance of Alnico alloy under irradiation and temperature field conditions comprises the following steps:

[0008] Step 1: Place the Alnico magnetic alloy sample into the sample slot of the heater, fill the empty part of the sample slot with refractory material, and cover the sample slot with a heat insulation board;

[0009] Step 2: Place the heater in the vacuum chamber, connect the power cord, thermocouple probe and inlet and outlet pipes, and then seal the vacuum chamber until it is sealed;

[0010] Step 3: Use protective atmosphere to perform gas cleaning on the vacuum chamber by filling and degassing, so that the cavity is filled with protective atmosphere, adjust the temperature control system to the experimental set temperature, and keep the temperature when the heater makes the temperature in the sample tank reach the set temperature;

[0011] Step 4: Set the irradiation time and start the irradiation experiment. Stop irradiation after the time is up. Wait until the radiation drops below the safe range, then immediately perform a performance test on the test sample and compare the performance changes before and after the experimental treatment.

[0012] Compared with the prior art, the present invention has the following effects:

[0013] The present invention aims at the special working conditions of the nuclear environment, and simulates the complex experimental conditions of Alnico magnetic alloy under the nuclear environment through the experimental device and the irradiation equipment, and places the sample together with the heater in the vacuum chamber to realize the working conditions of the irradiation and temperature to test the performance of Alnico magnetic alloy. The accuracy of the service stability evaluation of Alnico magnetic alloy in the actual nuclear environment is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The schematic diagram of the heater and temperature measurement and control system of the present invention is

[0015] Figure 2 This is a schematic diagram of the radiation and temperature field coupling experimental device of the present invention.

[0016] In the figure: 1. Alnico magnetic alloy sample, 2. heater, 3. vacuum chamber, 4. power cord, 5. air inlet pipe, 6. air outlet pipe, 7. thermocouple probe, 8. external temperature control system. DETAILED DESCRIPTION

[0017] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0019] Specific implementation method 1: Combination Figure 1 to Figure 2 The present embodiment is described. The performance evaluation method of the Alnico alloy under irradiation and temperature field conditions of the present embodiment comprises the following steps:

[0020] Step 1: Place the Alnico magnetic alloy sample 1 into the sample slot of the heater 2, fill the remaining part of the sample slot with refractory material, and cover the sample slot with a heat insulation board;

[0021] The refractory material of this embodiment is resistant to high temperatures. In actual use, the refractory material needs to fill the sample slot of the heater so as to improve the heat preservation effect in the sample slot of the heater 2.

[0022] The size of the aluminum silicate ceramic fiber insulation board of this embodiment is customized according to the size of the sample slot, in order to fix the fixture so as to improve the temperature stability of the sample 1 during the experiment.

[0023] Step 2: Place the heater 2 into the vacuum chamber 3, connect the power cord 4, the thermocouple probe 7 and the air inlet and outlet pipes 6, and then close the vacuum chamber 3 to a sealed state;

[0024] Step 3: Use protective atmosphere to perform gas washing treatment on the vacuum chamber 3 by filling and degassing, so that the cavity is filled with protective atmosphere, adjust the temperature control system to the experimental set temperature, and keep the temperature when the heater 2 makes the temperature in the sample tank reach the set temperature;

[0025] Step 4: Set the irradiation time and start the irradiation experiment. Stop irradiation after the time is up. Wait until the radiation drops below the safe range, then immediately perform a performance test on the test sample and compare the performance changes before and after the experimental treatment.

[0026] Specific implementation method 2: Combination Figure 1 To explain this embodiment, the Alnico magnetic alloy sample 1 of this embodiment is provided with parallel samples, preferably, two parallel samples. Such a setting prevents accidental errors in the sample. Other components and connection relationships are the same as those of the first embodiment.

[0027] Specific implementation method three: Combination Figure 1 To explain this embodiment, the refractory material of this embodiment is refractory asbestos. This arrangement ensures that the sample is heated evenly in the sample tank. Other components and connection relationships are the same as those of the first or second embodiment.

[0028] Specific implementation method four: Combination Figure 1 To explain this embodiment, the heat insulation board of this embodiment is an aluminum silicate ceramic fiber heat insulation board. Such a configuration is convenient for heat preservation. Other components and connection relationships are the same as those of the specific embodiments one, two or three.

[0029] Specific implementation method five: Combination Figure 1 To illustrate this embodiment, the protective atmosphere of this embodiment is an inert gas, preferably nitrogen. This configuration prevents oxidation of the experimental sample. Other components and connection relationships are the same as those of the first, second, third or fourth embodiments.

[0030] Specific implementation method six: Combination Figure 1 This embodiment is described. The protective atmosphere of this embodiment performs multiple gas-filling and gas-discharging washing treatments on the cavity. Preferably, the washing treatment is set to 6 to 7 times. This arrangement ensures that the air in the cavity is discharged before heating. The other components and connection relationships are the same as those of the specific embodiments one, two, three, four or five.

[0031] Specific implementation method seven: Combination Figure 1 This embodiment is described. The sample heat preservation time of this embodiment is 15 to 20 minutes. This arrangement ensures that the sample can be fully and evenly heated to the experimental setting temperature before the irradiation begins, so as to improve the accuracy of the experiment. The other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five or six.

[0032] Specific implementation method eight: Combination Figure 1 This embodiment is described. The sample irradiation time of this embodiment is 20 to 80 minutes. This setting satisfies the duration of the experimental conditions. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six or seven.

[0033] The present invention has been disclosed as above with preferred implementation cases, but it is not used to limit the present invention. Any simple modification, equivalent changes and modifications made to the above implementation cases by any professional and technical personnel who do not deviate from the content of the technical solution of the present invention and based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Performance evaluation method of Alnico alloy under irradiation and temperature field conditions, Features: It includes the following steps: Step 1: Place the Alnico magnetic alloy sample (1) into the sample slot of the heater (2), fill the empty part of the sample slot with refractory material, and cover the top of the sample slot with a heat insulation board; Step 2: Place the heater (2) in the vacuum chamber (3), connect the power cord (4), the thermocouple probe (7), and the air inlet and outlet pipes (6), and then seal the vacuum chamber (3) to a sealed state; Step 3: Use protective atmosphere to perform gas cleaning on the vacuum chamber (3) by filling and discharging gas, so that the cavity is filled with protective atmosphere, adjust the temperature control system to the experimental set temperature, and when the heater (2) makes the temperature in the sample tank reach the set temperature, keep it warm for 15 to 20 minutes; Step 4: The irradiation time is 20 to 80 minutes. Set the irradiation time and start the irradiation experiment. Stop the irradiation after the time is up. Wait until the radiation drops below the safe range, then immediately perform a performance test on the test sample to compare the performance changes before and after the experimental treatment.

2. The method for evaluating the performance of Alnico alloy under irradiation and temperature field conditions according to claim 1, Features: The sample in step 1 is provided with 2 parallel samples.

3. The method for evaluating the performance of Alnico alloy under irradiation and temperature field conditions according to claim 1, Features: The refractory material in step 1 is refractory asbestos.

4. The method for evaluating the performance of Alnico alloy under irradiation and temperature field conditions according to claim 1, Features: The thermal insulation board in step 1 is an aluminum silicate ceramic fiber thermal insulation board.

5. The method for evaluating the performance of Alnico alloy under irradiation and temperature field conditions according to claim 1, Features: In the step 3, the protective atmosphere is nitrogen.

6. The method for evaluating the performance of Alnico alloy under irradiation and temperature field conditions according to claim 1, Features: In the step 3, the cavity is subjected to a gas washing treatment of filling and degassing with a protective atmosphere for 6 to 7 times.

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