Sample centering device and method for steady-state high-intensity magnetic field platform

Abstract

The invention relates to the technical field of high-intensity magnetic field platform sample chambers, and particularly provides a steady-state high-intensity magnetic field platform sample centering device and method.The sample centering device comprises a first container, a second container and inert filler; the second container is used for packaging an experimental sample; the second container is embedded in the middle of the first container, and a gap between the second container and the first container is filled with inert filler; the first container is centrally embedded into the alloy crucible of the high-intensity magnetic field platform. The sample centering device provided by the invention can meet the process requirements of high-intensity magnetic field experiments on non-standard special-size experimental samples such as small-size blocks, thin strips and powder, the operation scheme is simple and efficient, the experimental result is stable and reliable, and the centering error of the experimental samples can be effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of strong magnetic field platform sample chambers, and in particular relates to a device and method for centering a sample on a steady-state strong magnetic field platform. Background Art

[0002] Strong magnetic field refers to a magnetic field of more than 2T (Tesla) generated by superconducting technology, which has the characteristics of cleanliness, directionality and non-contact. The existing superconducting strong magnetic field platform uses superconducting magnets made of Nb3Sn material, and the steady-state magnetic field strength generated can reach 18T, which can achieve an experimental environment with a temperature range from room temperature to 1200K.

[0003] The sample chamber (high temperature alloy crucible, effective size is Φ35mm×80mm) of the steady-state strong magnetic field platform is a hollow cylinder with an open top. The sample chamber is positioned at the center of the coil and the strong magnetic field through a positioning frame to meet the process requirements of the sample for strong magnetic field and temperature rise heating experiments. Normally, the sample size is required to be a 25mm×25mm×80mm rectangular parallelepiped or a Φ35mm×80mm cylinder standard shape. The sample size matches the inner diameter of the high temperature alloy crucible and can be directly placed in the alloy crucible to carry out strong magnetic field and temperature rise heating experiments normally.

[0004] However, in the actual experimental process, many sample materials are small in size. When processed into regular shapes, the size of a single dimension is only a few millimeters, which is far below the size requirements of the standard shape. Due to the special size of this type of sample, it is impossible to properly fix it in the middle of the alloy crucible according to the requirements of conventional operations, thus deviating from the center area of ​​the strong magnetic field, causing errors in the experimental results. What is more serious is that when conducting a strong magnetic field experiment, the sample is unevenly stressed under the action of the strong magnetic field, and strong collisions and vibrations occur between the sample and the alloy crucible, causing damage to the sample and the alloy crucible and pollution in the center area of ​​the strong magnetic field. In severe cases, the positioning frame may even be bent and deformed, causing loss of the strong magnetic field equipment. In addition, for other special samples, such as thin strips, powders, etc., they also need to be accurately fixed in the center of the strong magnetic field to meet the process requirements of the strong magnetic field experiment. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a sample centering device and method for a steady-state strong magnetic field platform, which can quickly realize the centering and fixing of experimental samples.

[0006] In the first aspect, the present invention proposes a sample centering device for a steady-state strong magnetic field platform, comprising: a first container, a second container and an inert filler; the second container is used to encapsulate experimental samples; the second container is centrally embedded in the first container, and the gap between the second container and the first container is filled with the inert filler; the first container is centrally embedded in an alloy crucible of the strong magnetic field platform.

[0007] Furthermore, the inert filler is prepared by mixing a filler, a binder and a solvent to form a slurry, and then drying the slurry.

[0008] Further, the filler comprises a mixture of one or more of silicon oxide, magnesium oxide, aluminum oxide, chromium oxide green and zirconium oxide.

[0009] Furthermore, the filler includes coarse particles and fine particles, the coarse particles have a particle size of 2-5 mm, and the fine particles have a particle size of 1-2 mm.

[0010] Furthermore, the sample centering device also includes a positioning member, which includes a cylindrical positioning plug; a conical hole is provided at the bottom center of the positioning plug, and the side wall of the positioning plug corresponding to the conical hole is embedded and supported between the first container and the second container.

[0011] Furthermore, the first container comprises a quartz glass bottle; and the second container comprises a quartz glass tube.

[0012] Furthermore, the mass ratio of the filler, the binder and the solvent is 2-6:10-20:10-20.

[0013] Furthermore, the binder is a mixture of aluminum dihydrogen phosphate and cement.

[0014] In a second aspect, the present invention further proposes a method for implementing a steady-state strong magnetic field experiment using the above-mentioned sample centering device, comprising the following steps:

[0015] According to the size of the experimental sample, a second container with a size matching the size thereof is selected, and the experimental sample is packaged in the second container;

[0016] According to the size of the second container, a center mark line is set on the outside of the first container;

[0017] Prepare a slurry formed by mixing a filler, a binder and a solvent, add a portion of the slurry into the first container, wrap a second container with weighing paper, place the second container in the slurry in the first container, ensure that the center of the second container coincides with the marking line of the first container, and then add the remaining slurry to fill the first container;

[0018] Drying the first container to solidify the slurry inside the container;

[0019] The first container in which the internal slurry is solidified and formed into an inert filler is placed in an alloy crucible to carry out a steady-state strong magnetic field and a temperature increase heating experiment.

[0020] Furthermore, it also includes: after the steady-state strong magnetic field and temperature increase heating experiments are completed, the inert filler in the first container and the second container are taken out together, the inert filler and the second container are separated, and the experimental sample in the second container is taken out.

[0021] The beneficial effects of the present invention are as follows: the first container is mainly used to carry the experimental sample, and at the same time, it also serves as an inert isolation layer to protect the alloy crucible and avoid contaminating the internal equipment of the strong magnetic field; the experimental sample is encapsulated by the second container, and the second container is positioned and fixed by the inert filler filled in the gap between the first container and the second container, so as to avoid the problem that the experimental sample cannot be fixed in the center of the alloy crucible due to its too small size, and the experimental sample is vacuum-sealed by the second container to reduce the possibility of the experimental sample being contaminated by the external environment. The sample centering device provided by the present invention can meet the process requirements of strong magnetic field experiments for non-standard special size experimental samples such as small-sized blocks, thin strips and powders, the operation scheme is simple and efficient, the experimental results are stable and reliable, and the centering error of the experimental sample can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional structure diagram of the first container and the second container of the sample centering device of the steady-state strong magnetic field platform of the present invention after being nested and matched;

[0023] Figure 2 A schematic diagram of the structure of the positioning member of the sample centering device of the present invention completing the positioning of the first container and the second container;

[0024] Figure 3 It is a schematic diagram of the structure in which an inert filler is filled between the first container and the second container of the present invention;

[0025] Figure 4 for Figure 3 A schematic diagram of a top view structure;

[0026] Figure 5 It is a schematic structural diagram of the sample centering device of the present invention being placed in an alloy crucible after the inert filler is solidified and shaped.

[0027] In the figure: 1 - first container; 2 - second container; 3 - inert filler; 4 - positioning piece; 5 - experimental sample; 6 - alloy crucible. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the accompanying drawings and specific implementations:

[0029] like Figure 1-Figure 5 The sample centering device of the steady-state strong magnetic field platform shown includes: a first container 1, a second container 2 and an inert filler 3.

[0030] The second container 2 is used to encapsulate the experimental sample 5. The second container 2 is centrally embedded in the first container 1, and the gap between the second container 2 and the first container 1 is filled with an inert filler 3; the first container 1 is centrally embedded in the alloy crucible 6 of the strong magnetic field platform. The first container 1 is a quartz glass bottle, and the second container 2 is a quartz glass tube.

[0031] The size of the quartz glass bottle is Φ35mm×80mm, and it can be completely embedded in the alloy crucible 6. The quartz glass bottle is mainly used as a container to carry the experimental sample 5. At the same time, it also serves as an inert isolation layer to protect the alloy crucible 6 and avoid contaminating the internal equipment of the strong magnetic field. In the experiment, according to the position of the alloy crucible 6 in the strong magnetic field, the center position of the strong magnetic field corresponding to the quartz glass bottle is determined to ensure the accurate effect of the strong magnetic field and temperature settings on the sample.

[0032] The inert filler 3 is filled into the quartz glass bottle to ensure that the experimental sample 5 can be located at the center of the strong magnetic field.

[0033] The quartz glass tube is used to vacuum seal non-standard size experimental samples 5 such as small-sized blocks, thin strips and powders, thereby reducing the possibility of the experimental samples 5 being contaminated by the external environment.

[0034] like Figure 2 As shown, the sample centering device also includes a positioning member 4, which includes a cylindrical positioning plug; a tapered hole is provided at the bottom center of the positioning plug, and the side wall of the positioning plug corresponding to the tapered hole is embedded and supported between the first container 1 and the second container 2. When the positioning plug is inserted between the quartz glass bottle and the quartz glass tube, the inner wall of the tapered hole abuts against the outer edge of the upper end of the quartz glass tube, and the outer wall of the positioning plug contacts the inner wall of the quartz glass bottle. When the positioning plug cannot be inserted further downward, the inner wall of the tapered hole is completely in contact with the outer edge of the quartz glass tube. Under the action of the positioning plug, the quartz glass tube is gathered and positioned to the center position of the quartz glass bottle. At this time, the central axes of the quartz glass bottle, the quartz glass tube and the positioning plug coincide. The tapered hole can be used for positioning and fixing quartz glass tubes of different calibers.

[0035] In this embodiment, the positioning plug includes two semi-cylinders, which are joined together to form a complete cylindrical structure, and the tapered holes are evenly and symmetrically distributed at the bottom of the two semi-cylinders. That is, a half tapered hole is set at the bottom of each semi-cylinder. The quartz glass tube is positioned by closing the two semi-cylinders, and then any semi-cylinder is taken out to keep a distance between the tube mouth of the quartz glass tube and the bottle mouth of the quartz glass bottle to form a filling inlet, and the inert filler 3 is filled into the gap between the quartz glass tube and the quartz glass bottle through the filling inlet. In this process, due to the limiting effect of the other semi-cylinder, the quartz glass tube is always in the center position.

[0036] The inert filler 3 of this embodiment is prepared by mixing a filler, a binder and a solvent to form a slurry, and then drying the slurry. The filler includes a mixture of one or more of silicon oxide, magnesium oxide, aluminum oxide, chromium oxide green and zirconium oxide. The filler includes coarse particles and fine particles, and the particle size ratio is 2-5 mm for coarse particles and 1-2 mm for fine particles.

[0037] The filler prepared in the embodiment of the present invention is mainly a composite of coarse particles and fine particles, with a particle size ratio of 2-5 mm coarse particles and 1-2 mm fine particles, while the comparative example uses a single small-diameter powder, with a particle size ratio of 0-0.1 mm (100%). The binder, solvent and filler of the inert filler 3 are added according to the weight parts in the table below and fully stirred and mixed into a slurry, as shown in the table below. Among them, the binder is a mixture of aluminum dihydrogen phosphate and cement. The solvent is a mixture of water and ethanol.

[0038]

[0039]

[0040] From the data in the above table, it can be seen that the coarse particles and fine particles used in Examples 1 to 5 can be completely separated from the quartz glass compared to the fillers of small-size particles in Comparative Examples 1 to 3. In other words, the inert filler 3 of this embodiment can be completely separated from the quartz glass tube and the quartz glass bottle, so that after the steady-state strong magnetic field and the temperature increase heating experiment are completed, it is convenient to take out and separate the quartz glass tube and the quartz glass bottle.

[0041] Based on the same inventive concept, the present invention also proposes a method for implementing a steady-state strong magnetic field experiment using the above-mentioned sample centering device, comprising the following steps:

[0042] According to the size of the experimental sample 5, a second container 2 with a size matching the size is selected, and the experimental sample 5 is encapsulated in the second container 2. That is, a plurality of quartz glass tubes of different specifications and sizes are provided, and a quartz glass tube of appropriate specifications is selected according to the size of the experimental sample 5, and it is best to fit the experimental sample 5 into the quartz glass tube without shaking or displacement. After determining the specifications of the quartz glass tube, the size of the quartz glass tube is measured.

[0043] According to the size of the second container 2, i.e., the quartz glass tube, marking lines such as the center, upper and lower positions are set on the outside of the first container 1, i.e., the quartz glass bottle, to ensure that the experimental sample 5 can be located at the center of the strong magnetic field platform.

[0044] Prepare a slurry formed by mixing filler, binder and solvent, add a part of the prepared slurry into the first container 1, wrap the second container 2 with weighing paper, and then place the second container 2 wrapped with weighing paper into the slurry in the first container 1, ensuring that the center of the second container 2 coincides with the marking line of the first container 1, and then add the remaining slurry to fill the first container 1.

[0045] The first container 1 is placed in an oven at 100 degrees to dry for 2 hours to solidify the slurry inside.

[0046] The first container 1 in which the inert filler 3 is formed after the internal slurry is solidified and shaped is placed in the alloy crucible 6, and a steady-state strong magnetic field and temperature increase heating experiment is carried out.

[0047] After the steady-state strong magnetic field and temperature increase heating experiments are completed, the inert filler 3 in the first container 1 and the second container 2 are taken out together, carefully knocked to separate the inert filler 3 and the second container 2, and the experimental sample 5 in the second container 2 is taken out to facilitate other experimental work on the experimental sample 5.

[0048] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A sample centering device for a steady-state strong magnetic field platform, characterized in that: include: A first container, a second container and an inert filler; the second container is used to package the experimental sample; The second container is centrally embedded in the first container, and the gap between the second container and the first container is filled with the inert filler; the first container is centrally embedded in the alloy crucible of the strong magnetic field platform.

2. A sample centering device for a steady-state strong magnetic field platform according to claim 1, characterized in that: The inert filler is prepared by mixing a filler, a binder and a solvent to form a slurry, and then drying the slurry.

3. A sample centering device for a steady-state strong magnetic field platform according to claim 1, characterized in that: The filler includes a mixture of one or more of silicon oxide, magnesium oxide, aluminum oxide, chromium oxide green and zirconium oxide.

4. A sample centering device for a steady-state strong magnetic field platform according to claim 2, characterized in that: The filler comprises coarse particles and fine particles, the coarse particles have a particle size of 2-5 mm, and the fine particles have a particle size of 1-2 mm.

5. A sample centering device for a steady-state strong magnetic field platform according to claim 1, characterized in that: The sample centering device also includes a positioning member, which includes a cylindrical positioning plug; a conical hole is provided at the bottom center of the positioning plug, and the side wall of the positioning plug corresponding to the conical hole is embedded and supported between the first container and the second container.

6. A sample centering device for a steady-state strong magnetic field platform according to claim 1, characterized in that: The first container comprises a quartz glass bottle; the second container comprises a quartz glass tube.

7. A sample centering device for a steady-state strong magnetic field platform according to claim 2, characterized in that: The mass ratio of the filler, the binder and the solvent is 2-6:10-20:10-20.

8. The sample centering device for a steady-state strong magnetic field platform according to claim 2, characterized in that: The binder is a mixture of aluminum dihydrogen phosphate and cement.

9. A method for implementing a steady-state high magnetic field experiment using the sample centering device as claimed in claim 1, characterized in that: The following steps are involved: According to the size of the experimental sample, a second container with a size matching the size thereof is selected, and the experimental sample is packaged in the second container; According to the size of the second container, a center mark line is set on the outside of the first container; Prepare a slurry formed by mixing a filler, a binder and a solvent, add a portion of the slurry into the first container, wrap a second container with weighing paper, place the second container in the slurry in the first container, ensure that the center of the second container coincides with the marking line of the first container, and then add the remaining slurry to fill the first container; Drying the first container to solidify the slurry inside the container; The first container in which the internal slurry is solidified and formed into an inert filler is placed in an alloy crucible to carry out a steady-state strong magnetic field and a temperature increase heating experiment.

10. The steady-state high magnetic field experimental method according to claim 9, characterized in that: Also includes: After the steady-state strong magnetic field and temperature increase heating experiments are completed, the inert filler in the first container and the second container are taken out together, the inert filler and the second container are separated, and the experimental sample in the second container is taken out.

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