Shielding part and manufacturing method therefor, and Anti-radiation product

Abstract

The present application relates to a shielding part and a manufacturing method therefor and a use thereof, and an anti-radiation product. The manufacturing method for the shielding part comprises the following steps: (1) using a selective laser melting process to print a shielding part framework, the shielding part framework having a hole structure in the printing height direction; (2) using a fused deposition manufacturing process to print a shielding material in the hole structure of the shielding part framework; and (3) repeating steps (1)-(2), so as to perform, for multiple times, the step of printing the shielding part framework and the step of printing the shielding material in the previously printed shielding part framework, until a shielding part having a required height is obtained. By using the manufacturing method, a shielding part having a required height can be obtained, and the protection effect of the shielding part can be effectively improved.

Description

Shielding component and preparation method thereof and radiation protection product

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 2023115724096, filed on November 22, 2023, entitled “Shielding components, preparation methods thereof, and radiation protection products,” the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application relates to the field of materials, and in particular to a shielding component, a preparation method thereof, and a radiation protection product. Background Art

[0004] Neutrons are one of the fundamental particles that make up the atomic nucleus. They are inherently uncharged, but due to their high speed, they can ionize matter, producing radioactive radiation. They are widely used in defense, scientific research, radiotherapy, and detection. Neutrons are indispensable in the development of nuclear power through nuclear fission, providing humanity with a vast amount of clean energy. However, the large number of secondary particles produced by neutron ionization interact with tissue cells, posing a significant threat to human health. Furthermore, neutron irradiation can create point defects and dislocations within materials, degrading their properties. With the rapid development of the nuclear industry, a range of new reactors, including lead-bismuth fast reactors, modular small reactors, sodium-cooled fast reactors, and high-temperature gas-cooled reactors, have entered the research and development, construction, or operation stages. Although these reactor types differ significantly in core design, they all meet the requirement for neutron shielding, and neutron shielding materials are essential for fission reactors. However, neutron shielding materials prepared by traditional methods offer poor neutron protection.

[0005] Summary of the Invention

[0006] Based on this, the present application provides a shielding component with good protection effect, its preparation method and application, and radiation protection product.

[0007] The technical solution of this application to solve the above technical problems is as follows.

[0008] On one hand, the present application provides a method for preparing a shielding component, comprising the following steps:

[0009] (1) Printing a shielding component skeleton using a selective laser melting process, wherein the shielding component skeleton has a hole structure along a printing height direction;

[0010] (2) printing shielding material in the hole structure of the shielding component skeleton using a fused deposition manufacturing process;

[0011] (3) Repeat steps (1) to (2) to perform the steps of printing the shielding component skeleton and printing the shielding material in the shielding component skeleton formed by the previous printing multiple times until a shielding component of a desired height is obtained.

[0012] In some embodiments, in the method for preparing a shielding component, the height of the shielding component skeleton printed in step (1) is ≤7 mm.

[0013] In some embodiments, in the method for preparing a shielding component, the height of the shielding component skeleton printed in step (1) is 1 mm to 5 mm.

[0014] In some embodiments, in the method for preparing the shielding component, the porosity of the shielding component skeleton is 60% to 85%.

[0015] In some embodiments, in the method for preparing a shielding component, the shielding component skeleton has a plurality of hole structures, and the diameter of each hole structure is 1 mm to 5 mm.

[0016] In some embodiments, in the method for preparing a shielding component, the cross-section of the hole structure includes at least one of a circle, an ellipse, and a regular polygon.

[0017] In some embodiments, in the method for preparing a shielding component, the extrusion rate of printing the shielding material using the fused deposition manufacturing process is 100 mL / min to 500 mL / min.

[0018] In some embodiments, in the method for preparing a shielding component, the diameter of the wire of the shielding material printed using the fused deposition manufacturing process is 1 mm to 3 mm.

[0019] In some embodiments, in the method for preparing a shielding component, the shielding material includes at least one of boron-containing polyethylene and boron-containing polypropylene.

[0020] In some embodiments, in the method for preparing a shielding component, the material of the shielding component skeleton includes aluminum alloy.

[0021] A second aspect of the present application provides a shielding component, which is manufactured using the shielding component manufacturing method provided by the first aspect.

[0022] The third aspect of the present application provides the use of the shielding component provided in the second aspect in the preparation of radiation protection products.

[0023] The fourth aspect of the present application provides a radiation protection product, including the shielding component provided by the second aspect.

[0024] Compared with the prior art, the preparation method of the shielding component of the present application has the following beneficial effects:

[0025] The preparation method of the above-mentioned shielding component adopts a selective laser melting process to print the shielding component skeleton, and controls the shielding component skeleton to have a hole structure along the printing height direction, and controls the height of the shielding component skeleton of a single print, so that when the shielding material is further printed in the hole structure of the shielding component skeleton using a fused deposition manufacturing process, the printing process is smooth, and the density of the shielding material printed in situ in the hole structure is high; repeating the above steps, that is, continuing to use the selective laser melting process to print the shielding component skeleton above the shielding component filled with shielding material in the hole structure to increase the height of the shielding component skeleton obtained by plate printing, and printing the material in the hole structure of the shielding component skeleton printed last time, so that a shielding component of the required height can be obtained. The various steps cooperate with each other to effectively improve the protective effect of the shielding component. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0027] FIG1 is a schematic flow chart of a method for preparing a shielding component according to one embodiment. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] The term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements limited by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. The indefinite articles "a" and "an" before the elements or components of the present invention have no restriction on the quantity requirements (i.e., the number of occurrences) of the elements or components. Therefore, "a" or "a" should be interpreted as including one or at least one, and elements or components in the singular also include plural forms, unless the quantity obviously refers only to the singular form. The meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] The weights of the relevant components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the weight ratio between the components. Therefore, as long as the content of the relevant components is proportionally increased or decreased according to the description of the embodiments of the present invention, it is within the scope disclosed in the description of the embodiments of the present invention. Specifically, the weights mentioned in the description of the embodiments of the present invention may be mass units known in the chemical industry, such as μg, mg, g, and kg.

[0032] Except as shown in the operating examples or otherwise indicated, all numbers used in the specification and claims to express the amount of ingredients, physicochemical properties, etc. are understood to be adjusted by the term "about" in all cases. For example, therefore, unless otherwise indicated, the numerical parameters listed in the above specification and the appended claims are approximate values, and those skilled in the art will be able to appropriately change these approximate values ​​using the teachings disclosed herein to seek to obtain the desired properties. The use of numerical ranges expressed as endpoints includes all numbers within the range and any range within the range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4 and 5, etc.

[0033] An embodiment of the present application provides a method for preparing a shielding component, comprising the following steps:

[0034] Step S10: using a selective laser melting process (SLM process) to print a shielding component skeleton, wherein the shielding component skeleton has a hole structure along a printing height direction.

[0035] In some examples, the height of the shielding component skeleton printed in step S10 is ≤7 mm.

[0036] In some examples, the height of the shielding component skeleton printed in step S10 is 1 mm to 5 mm.

[0037] It is understood that the height of the shielding component skeleton printed in step S10 above refers to the height of a single printing step of step S10. After printing reaches this height, step S20 is stopped, and the height of the shielding component skeleton printed in each subsequent repetition of step S10 meets the above requirements. It is further understood that the height of the shielding component skeleton printed in a single printing includes but is not limited to 1mm, 2mm, 3mm, 4mm, and 5mm. In the examples, any two of these point values ​​can be used as the end values ​​within the range, and the same applies below.

[0038] Optionally, the height of the shielding component skeleton printed in step S10 is 3 mm to 5 mm.

[0039] Preferably, the height of the shielding component skeleton printed in step S10 is 4 mm.

[0040] By controlling the height of the shielding component skeleton printed in a single pass, it is possible to avoid loose filling due to the depth of the hole structure being too deep and the FDM filling process of the shielding material being not smooth; that is, by controlling the height of the shielding component skeleton printed in a single pass, the density of the shielding material in the shielding component skeleton can be further improved, thereby further improving the shielding effect of the shielding component.

[0041] In some examples, in step S10 , the porosity of the shielding component skeleton is 60% to 85%.

[0042] It can be understood that the porosity of the shielding component skeleton refers to the porosity of the shielding component skeleton printed in step S10; it can be further understood that by controlling the porosity of the shielding component skeleton printed in each step S10 within the above range, the porosity of the shielding component skeleton of the entire shielding component can be controlled.

[0043] It is also understood that the porosity of the shielding component skeleton includes but is not limited to 60%, 62%, 65%, 68%, 70%, 72%, 75%, 78%, 80%, 82%, and 85%.

[0044] Optionally, the porosity of the shielding component skeleton is 75% to 85%.

[0045] Preferably, the shielding member skeleton has a porosity of 80%.

[0046] By controlling the porosity of the shielding component skeleton and ensuring the filling ratio of the shielding material in the shielding component, a better shielding effect is achieved, and at the same time the shielding component also has better mechanical strength.

[0047] In some examples, in step S10 , the shielding component skeleton has a plurality of hole structures, and the diameter of each hole structure is 1 mm to 5 mm.

[0048] It can be understood that the pore size of a single pore structure includes but is not limited to 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm.

[0049] Optionally, the pore diameter of a single pore structure is 2 mm to 4 mm.

[0050] Preferably, the pore diameter of a single pore structure is 3 mm.

[0051] By controlling the aperture of a single hole structure in the shielding component skeleton, the smoothness of the printing process can be further improved, and the density of the shielding material printed in the hole structure can be further increased, thereby further improving the shielding effect of the shielding component, while also giving the shielding component better mechanical strength.

[0052] In some examples, in step S10 , the hole structure is a through hole along the printing height direction.

[0053] It is understood that the present application does not limit the structure of the hole structure, and the shielding material can be printed in any shape, such as a circle, an ellipse, a polygon, etc. Furthermore, polygons can be divided into regular polygons, irregular polygons, convex polygons, and concave polygons.

[0054] In some examples, in step S10 , the cross-section of the hole structure includes at least one of a circle, an ellipse, and a regular polygon.

[0055] Furthermore, regular polygons include but are not limited to regular triangles, squares, regular pentagons, regular hexagons, and the like.

[0056] In some examples, in step S10, the cross-section of the hole structure is circular, which allows for better subsequent filling of shielding material and has good mechanical strength.

[0057] In some examples, in step S10 , parameters of the selective laser melting process include: laser power of 200 W to 400 W, scanning speed of 500 mm / s to 1500 mm / s, scanning spacing of 0.05 mm to 0.08 mm, and a scanning strategy using contour offset scanning.

[0058] It can be understood that the laser power includes but is not limited to 200W, 300W, and 400W, the scanning speed includes but is not limited to 500mm / s, 600mm / s, 800mm / s, 1000mm / s, 1200mm / s, and 1500mm / s, and the scanning spacing is 0.05mm, 0.06mm, 0.07mm, and 0.08mm.

[0059] In some examples, in step S10 , the material of the shielding component frame includes aluminum alloy.

[0060] In some examples, after step S10 is completed and before step S20 is performed, a step of removing unmelted powder on the shielding component skeleton is further included.

[0061] In this way, the portion of the shielding component skeleton where the shielding material needs to be printed can be exposed, making it easier to print the shielding material in the hole structure of the shielding component skeleton in step S20.

[0062] Furthermore, the unmelted powder is purged with high-pressure air.

[0063] Step S20: using a fused deposition modeling (FDM) process to print shielding material in the hole structure of the shielding component skeleton.

[0064] Printing the shielding material into the hole structure of the shielding component skeleton through integrated additive manufacturing will fill the shielding component skeleton, which will help improve the density of the shielding material in the hole structure.

[0065] In some of these examples, in step S20 , the extrusion rate of printing the shielding material using the fused deposition manufacturing process is 100 mL / min to 500 mL / min.

[0066] It can be understood that the components of the fused deposition manufacturing process include a wire extruder, a hot melt nozzle and a displacement device that drives the hot melt nozzle to perform printing actions; by controlling the extrusion rate of the wire extruder, the extrusion rate of the shielding material printed by the fused deposition manufacturing process is controlled.

[0067] In some examples, in step S20 , the extrusion rate of the wire extruder is 100 mL / min to 500 mL / min.

[0068] It will be understood that the extrusion rate of the shielding material printed using the fused deposition manufacturing process includes but is not limited to 100 mL / min, 150 mL / min, 200 mL / min, 250 mL / min, 300 mL / min, 350 mL / min, 400 mL / min, 450 mL / min, and 500 mL / min.

[0069] Optionally, the extrusion rate is 200 mL / min to 400 mL / min.

[0070] Preferably, the extrusion rate is 300 mL / min.

[0071] By controlling the extrusion rate of the shielding material printed by the fused deposition manufacturing process, the wire can be better filled in the hole structure to avoid overflowing on the surface of the shielding component skeleton, while ensuring the printing efficiency.

[0072] In some of these examples, in step S20 , the diameter of the wire of the shielding material printed using the fused deposition manufacturing process is 1 mm to 3 mm.

[0073] It can be understood that by controlling the nozzle diameter of the hot melt nozzle, the wire diameter of the shielding material printed by the fused deposition manufacturing process can be controlled; further, the wire diameter of the shielding material printed by the fused deposition manufacturing process includes but is not limited to 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, and 3mm.

[0074] Optionally, the diameter of the wire of the shielding material printed using the fused deposition manufacturing process is 2 mm to 3 mm.

[0075] Preferably, the diameter of the wire used to print the shielding material using the fused deposition manufacturing process is 2.5 mm.

[0076] By using the fused deposition manufacturing process to print the wire diameter of the shielding material, it is beneficial for the shielding material to pass continuously after melting, and the discharge rate is relatively high.

[0077] It can be understood that the shielding objects that the shielding parts of the present application can be used for are determined according to the shielding material in the hole structure of the shielding parts, that is, according to the performance of the shielding material; for example, if the shielding material has shielding properties against neutrons, the shielding parts prepared in the present application can be used to shield neutrons.

[0078] In some examples, the shielding material in step S20 is a neutron shielding material.

[0079] In this case, the shielding component is a neutron shielding component.

[0080] In some examples, in step S20 , the shielding material wire includes at least one of boron-containing polyethylene and boron-containing polypropylene.

[0081] Step S30: repeating steps S10 to S20 to perform the steps of printing the shielding component skeleton multiple times and printing the shielding material in the shielding component skeleton formed by the previous printing, until a shielding component of a desired height is obtained.

[0082] The preparation method of the above-mentioned shielding component adopts a selective laser melting process to print the shielding component skeleton, and controls the shielding component skeleton to have a hole structure along the printing height direction, and controls the height of the shielding component skeleton of a single print, so that when the shielding material is further printed in the hole structure of the shielding component skeleton using a fused deposition manufacturing process, the printing process is smooth, and the density of the shielding material printed in situ in the hole structure is high; repeat the above steps, that is, continue to use the selective laser melting process to print the shielding component skeleton above the shielding component filled with shielding material in the hole structure to increase the height of the shielding component skeleton obtained by plate printing, and print the material in the hole structure of the shielding component skeleton printed last time, so that a shielding component of the required height can be obtained. The various steps cooperate with each other to effectively improve the protective effect of the shielding component.

[0083] It can be understood that, as shown in FIG1 , first, in step S10, a shielding component skeleton with a height of h1 is obtained by printing (SLM printing) using a selective laser melting process, which is referred to as a first shielding component skeleton 110; in step S20, a shielding material is in situ printed (FDM printing) in the hole structure of the first shielding component skeleton using a fused deposition modeling process to obtain a first shielding component; and then step S10 is repeated, and a second shielding component skeleton with a height of h2 is continued to be printed on the first shielding component skeleton having the shielding material 210 printed in the hole structure using a selective laser melting process. At this time, the shielding component skeleton obtained The component skeleton 120 includes a first shielding component skeleton and a second shielding component skeleton, with a height of h1+h2, and shielding material is printed in the first shielding component skeleton; repeat step S20 to print the shielding material 220 in situ in the hole structure of the second shielding component skeleton with a height of h2. At this time, the second shielding component obtained includes the first shielding component skeleton and the second shielding component skeleton, with a height of h1+h2, and the first shielding component skeleton and the second shielding component skeleton are both filled with shielding material; repeat steps S10 to S20 in this way to finally obtain the required height of the shielding component. For example, the required height of the shielding part is H, which can be as follows: the height of the shielding part skeleton printed for the first time is h1, and the shielding material is printed; the height of the shielding part skeleton printed for the second time is h2, and the shielding material is printed; the height of the shielding part skeleton printed for the third time is h3, and the shielding material is printed; the height of the shielding part skeleton printed for the fourth time is h4, and the shielding material is printed, and so on. The height of the shielding part skeleton printed each time is h1, h2, h3, h4, h5, h6, h7...; it can be understood that h1, h2, h3, h4, h5, h6, h7, etc. can be equal or unequal, and are not limited to the number of prints. The sum of the heights of the shielding part skeletons finally printed can meet H.

[0084] It can be further understood that the height of the shielding component of the present application is not restricted and is flexibly adjustable.

[0085] One embodiment of the present application provides a shielding component, which is manufactured using the above-mentioned shielding component manufacturing method.

[0086] The shielding component provided in the present application has good shielding effect, is particularly suitable for neutron shielding components, and has high mechanical strength.

[0087] One embodiment of the present application provides the use of the above-mentioned shielding component in the preparation of radiation protection products.

[0088] Another embodiment of the present application provides a radiation protection product, the material of which includes the above-mentioned shielding component.

[0089] In some embodiments, the radiation protection products include but are not limited to radiation protection clothing, radiation protection shields, radiation protection helmets, etc.

[0090] The above-mentioned shielding parts are used to prepare radiation-proof products, are suitable for protection against neutrons and the like, have good shielding performance against neutrons and other radiation, and can also give the radiation-proof products good mechanical properties.

[0091] In some embodiments, the radiation protection product may be made of the aforementioned shielding components, that is, the radiation protection product may be directly prepared using the aforementioned shielding components. In other embodiments, the radiation protection product may be made of other materials in addition to the aforementioned shielding components.

[0092] The present application will be described in further detail below in conjunction with specific implementation methods, but the implementation methods of the present application are not limited thereto.

[0093] Example 1

[0094] (1) A shielding component skeleton is printed using aluminum alloy powder, laser as a heat source, and nitrogen as a protective atmosphere through a powder-laying SLM process, and the printing is stopped when the height h1 of the printed shielding component skeleton is 4 mm, thereby obtaining a first shielding component skeleton; wherein the first shielding component skeleton has a pore structure along the printing height direction, a porosity of 80%, a circular hole structure, an aperture of 3 mm, and a height h1 of 4 mm for the first shielding component skeleton; the parameters of the SLM process are: laser power 320 W, scanning speed 1000 mm / s, scanning spacing 0.07 mm, and a scanning strategy using contour offset scanning;

[0095] (2) Printing the boron-containing polyethylene wire into the pore structure of the first shielding component skeleton using an FDM process to obtain the first shielding component; the parameters of the FDM process are: nozzle diameter 2.5 mm, extrusion rate 300 mL / min;

[0096] (3) Using the method of step (1), continue to print the second shielding component skeleton on the first shielding component skeleton of the first shielding component, and the height h2 of the second shielding component skeleton is 4 mm; at this time, the total height of the shielding component skeleton is 8 mm; other steps are the same as step (1);

[0097] (4) Print the boron-containing polyethylene wire in the hole structure of the second shielding component skeleton using the method of step (2) to obtain the second shielding component. The rest is the same as step (2); at this time, the height of the second shielding component is 8 mm.

[0098] Example 2

[0099] It is basically the same as Example 1, except that the height of the first shielding component skeleton in step (1) of Example 2 is 5 mm, the height of the second shielding component skeleton in step (3) is 3 mm, and the final height of the second shielding component is 8 mm.

[0100] Example 3

[0101] It is basically the same as Example 1, except that the height of the first shielding component skeleton in step (1) of Example 3 is 7 mm, the height of the second shielding component skeleton in step (3) is 1 mm, and the final height of the second shielding component is 8 mm.

[0102] Example 4

[0103] It is basically the same as Example 1, except that in step (1) of Example 4, the porosity of the first shielding component skeleton is 60%, and the pore diameter of the pore structure is 3 mm; the relevant parameters of step (3) are the same as those of step (1) of Example 3.

[0104] Example 5

[0105] It is basically the same as Example 1, except that in step (1) of Example 5, the porosity of the first shielding component skeleton is 80%, and the pore size of the pore structure is 5 mm; the relevant parameters of step (3) are the same as those of step (1) of Example 4.

[0106] Example 6

[0107] It is basically the same as Example 1, except that in step (2) of Example 6, the parameters of the FDM process are: nozzle diameter 1 mm, extrusion rate 100 mL / min; the relevant parameters of step (4) are the same as those of step (2) of Example 5.

[0108] Example 7

[0109] It is basically the same as Example 1, except that in step (2) of Example 7, the parameters of the FDM process are: nozzle diameter 3 mm, extrusion rate 500 mL / min; the relevant parameters of step (4) are the same as those of step (2) of Example 6.

[0110] Comparative Example 1

[0111] (1) A shielding component skeleton was printed using aluminum alloy powder, laser as a heat source, and nitrogen as a protective atmosphere. The shielding component skeleton was printed using a powder-laying SLM process until the height h1 of the printed shielding component skeleton was 8 mm. The shielding component skeleton had a pore structure along the printing height direction, a porosity of 80%, a circular pore structure, an aperture of 3 mm, and a height h of 8 mm. The SLM process parameters were: laser power 320 W, scanning speed 1000 mm / s, scanning spacing 0.07 mm, and a scanning strategy using contour offset scanning.

[0112] (2) Boron-containing polyethylene filaments were printed into the pore structure of the shielding component skeleton using the FDM process to obtain the shielding component; the parameters of the FDM process were: nozzle diameter 2.5 mm, extrusion rate 300 mL / min.

[0113] Comparative Example 2

[0114] (1) A first shielding component skeleton was printed using aluminum alloy powder, laser as a heat source, and nitrogen as a protective atmosphere through a powder-laying SLM process. Printing was stopped when the height h1 of the printed shielding component skeleton reached 4 mm, thereby obtaining the first shielding component skeleton. The first shielding component skeleton had a pore structure along the printing height direction, a porosity of 80%, a circular pore structure, an aperture of 3 mm, and a height h1 of 4 mm. The parameters of the SLM process were as follows: laser power 320 W, scanning speed 1000 mm / s, scanning spacing 0.07 mm, and a scanning strategy using contour offset scanning.

[0115] (2) pouring boron-containing polyethylene powder directly into the pore structure of the first shielding component skeleton to obtain the first shielding component;

[0116] (3) Using the method of step (1), continue to print the second shielding component skeleton on the first shielding component skeleton of the first shielding component, and the height h2 of the second shielding component skeleton is 4 mm; at this time, the total height of the shielding component skeleton is 8 mm; other steps are the same as step (1);

[0117] (4) Using the method of step (2), the boron-containing polyethylene powder is directly poured into the pore structure of the first shielding component skeleton to obtain a second shielding component.

[0118] The main parameters of each embodiment and comparative example are shown in Table 1.

[0119] Table 1

[0120] The shielding products prepared in each embodiment and comparative example were subjected to density, thermal neutron shielding performance tests and compressive strength tests. The density test adopted the Archimedes drainage method, and the compressive strength test followed ISO 13314:2011.

[0121] Test method for thermal neutron shielding performance

[0122] The test was conducted under a neutron dose equivalent rate standard device, measuring the count rate of the thermal neutron detector with and without the sample being shielded. During the measurement process, the position and orientation of the thermal neutron detector remained unchanged, and the plane of the sample being tested was parallel to the thermal neutron emission plane of the moderator. The thermal neutron shielding performance of the sample being tested was obtained by comparing the count rate results under the two conditions. To prevent neutrons from other directions from affecting the test results, the thermal neutron detector was placed in a cubic cadmium shielding box surrounded by cadmium sheets with a thickness of 2mm. There was no spacer on the side of the cadmium shielding box facing the thermal neutron emission plane of the moderator, ensuring that the thermal neutron detector only received thermal neutrons from the direction of the moderator. The specific experimental steps are as follows:

[0123] (1) Place the cadmium shielding box and detector in the center of the test area and measure the detector count rate when there is no sample;

[0124] (2) Keeping the positions of the cadmium shielding box and the detector unchanged, place the sample to be measured on the surface of the cadmium shielding box facing the thermal neutron emission plane of the moderator, and measure the counting rate of the detector when the sample is present;

[0125] (3) The thermal neutron shielding performance of the sample is calculated using the following formula:

[0126] Among them, η is the shielding performance, C S is the counting rate after adding shielding material; C b is the counting rate when there is no sample in the cadmium box.

[0127] The test results are shown in Table 2.

[0128] Table 2

[0129] It can be seen from Table 2 that, compared with the comparative example, the thermal neutron shielding performance of the shielding components prepared in each embodiment is better.

[0130] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0131] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for preparing a shielding component, comprising the following steps: (1) Printing a shielding component skeleton by a selective laser melting process, wherein the shielding component skeleton has a hole structure extending along a printing height direction; (2) using a fused deposition modeling process to print shielding material in the hole structure of the shielding component skeleton; (3) Repeat steps (1) to (2) to perform the steps of printing the shielding component skeleton and printing the shielding material in the shielding component skeleton formed by the previous printing multiple times until a shielding component of a desired height is obtained.

2. The preparation method according to claim 1, wherein The height of the shielding component skeleton printed in a single step (1) is ≤7 mm.

3. The preparation method according to any one of claims 1 to 2, wherein: The height of the shielding component skeleton printed in a single step (1) is 1 mm to 5 mm.

4. The preparation method according to any one of claims 1 to 3, wherein The porosity of the shielding component skeleton is 60% to 85%.

5. The preparation method according to any one of claims 1 to 4, wherein The porosity of the shielding component skeleton is 75% to 85%.

6. The preparation method according to any one of claims 1 to 5, wherein: The shielding component skeleton has a plurality of hole structures, and the hole diameter of each hole structure is 1 mm to 5 mm.

7. The preparation method according to any one of claims 1 to 6, wherein: The shielding component skeleton has a plurality of hole structures, and the hole diameter of each hole structure is 2 mm to 4 mm.

8. The preparation method according to any one of claims 1 to 7, wherein: The hole structure is a through hole extending along the printing height direction.

9. The preparation method according to any one of claims 1 to 8, wherein: The cross-section of the hole structure includes at least one of a circle, an ellipse and a regular polygon.

10. The preparation method according to any one of claims 1 to 9, wherein: The cross section of the hole structure is circular.

11. The preparation method according to any one of claims 1 to 10, wherein: The parameters of the selective laser melting process include: laser power of 200W to 400W, scanning speed of 500mm / s to 1500mm / s, and scanning spacing of 0.05mm to 0.08mm.

12. The preparation method according to any one of claims 1 to 11, wherein: The extrusion rate of the shielding material printed by the fused deposition manufacturing process is 100 mL / min to 500 mL / min.

13. The preparation method according to any one of claims 1 to 12, wherein: The extrusion rate of the shielding material printed by the fused deposition manufacturing process is 200 mL / min to 400 mL / min.

14. The preparation method according to any one of claims 1 to 13, wherein: The diameter of the wire of the shielding material printed by the fused deposition manufacturing process is 1 mm to 3 mm.

15. The preparation method according to any one of claims 1 to 14, wherein: The diameter of the wire of the shielding material printed by the fused deposition manufacturing process is 2 mm to 3 mm.

16. The preparation method according to any one of claims 1 to 15, wherein: The shielding material is a neutron shielding material.

17. The preparation method according to any one of claims 1 to 16, wherein: The shielding material includes at least one of boron-containing polyethylene and boron-containing polypropylene.

18. The preparation method according to any one of claims 1 to 17, wherein: The material of the shielding component frame includes aluminum alloy.

19. A shielding article, wherein: The method is as described in any one of claims 1 to 18.

20. A radiation protection product comprising the shielding member according to claim 19.

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