A ceramic material for shielding gamma and neutron rays and a method for manufacturing the same

Abstract

The application relates to the technical field of radiation shielding materials, and discloses a ceramic material for shielding gamma and neutron rays and a preparation method thereof.The ceramic material comprises a shielding layer and a protective layer arranged on the surface of the shielding layer;the preparation method of the shielding layer comprises the following steps: A1 taking 10 B COFs and organic resins are placed in a dispersion liquid, stirred, and product A is obtained; A2 product A is taken, and rare earth-based ceramics is added at a uniform speed under stirring until mixing is sufficient, and product B is obtained; A3 tungsten alloy balls are taken, a surfactant is added, stirring is carried out until mixing is uniform, product B is added, mixing is carried out, and a shielding layer is obtained through pressing. The ceramic material for shielding gamma and neutron rays has good shielding effects on gamma rays and neutron rays, that is, the shielding range of rays is wide, the shielding effect is more remarkable, and the material stability is stronger.

Description

Technical Field

[0001] This invention relates to the field of radiation shielding materials technology, and more specifically, to a ceramic material for shielding gamma and neutron rays and its preparation method. Background Technology

[0002] Radiation is a beam of particles or photons with specific energies emitted by various radioactive nuclides, or particles such as atoms, electrons, and neutrons, during energy exchange. Common types include alpha rays, beta rays, gamma rays, X-rays, and neutron rays. In the research and practical application of nuclear technology, how to reduce or avoid the damage and impact of highly penetrating radiation on the human body, equipment, or environment has always been an important issue in the field of nuclear technology.

[0003] To address the aforementioned radioactive rays, materials with shielding effects are typically used to block and shield the rays in the application environment. Currently, composite metal foam materials incorporating metal spheres have become a key research direction for achieving good shielding effects, offering advantages such as light weight and strong shielding capabilities. The metal spheres involved mainly include hollow spheres made of titanium alloys, aluminum alloys, and nickel alloys. To further enhance the shielding effect against gamma rays and neutron rays, tungsten alloy spheres have also been proposed. For example, patent publication number CN115945684A provides a tungsten alloy hollow sphere, its preparation method, and its application. This tungsten alloy hollow sphere can be used for gamma ray shielding and exhibits excellent gamma ray mass attenuation properties.

[0004] However, in the resin board made of the aforementioned tungsten alloy hollow spheres, during the sintering process, the tungsten alloy hollow spheres may crack due to shrinkage of the surface material, thus affecting their shielding effect. Summary of the Invention

[0005] The technical problem to be solved by this invention:

[0006] Currently, in shielding materials for gamma rays, neutron rays, etc., a technique has been proposed to use tungsten alloy hollow spheres instead of traditional titanium alloy, aluminum alloy, and nickel alloy metal spheres, in order to achieve shielding against higher-energy gamma rays through tungsten alloy materials. However, in existing resin boards made of tungsten alloy hollow spheres, the surface material of the tungsten alloy hollow spheres shrinks and cracks at high temperatures, thus reducing the radiation shielding effect of the final board.

[0007] The technical solution adopted in this invention is as follows:

[0008] The present invention provides a ceramic material for shielding gamma and neutron rays, including a shielding layer and a protective layer covering the surface of the shielding layer;

[0009] The method for preparing the shielding layer includes the following steps:

[0010] A1 take 10 B@COFs and organic resin were placed in a dispersion and stirred to obtain product A;

[0011] A2 Take product A, add rare earth-based ceramics at a uniform rate while stirring, and obtain product B after thorough mixing;

[0012] Take tungsten alloy balls separately, add surfactant, stir and mix well, then add product B, mix, press and shape to obtain the shielding layer.

[0013] Preferably, the organic resin includes one or more of polyethylene, cyanate ester, epoxy resin, polyurethane, polyimide, or high-hydrogen polyethylene.

[0014] Preferably, in step A1, 10 The mass ratio of B@COFs to organic resin is 1:05-0.8.

[0015] Preferably, the rare earth-based ceramic is prepared by high-temperature sintering of rare earth oxides and zirconium oxide;

[0016] Rare earth oxides include one or two of cerium oxide, thulium oxide, erbium oxide, gadolinium oxide, zirconium oxide, and tantalum oxide.

[0017] Preferably, the amount of rare earth-based ceramics is 40-75% of the total mass of product A, and the amount of tungsten alloy balls is 80-112% of the total volume of product A.

[0018] Preferably, the surfactant includes one or more of oleic acid, oleylamine, dodecyl dimethyl benzyl ammonium chloride, or hexadecyl trimethyl ammonium chloride.

[0019] Preferably, the mass ratio of surfactant to tungsten alloy balls is 1-2.8:9-15.

[0020] Preferably, the thickness of the protective layer is ≤ 22.5% of the thickness of the shielding layer.

[0021] Preferably, the characteristic is that the 10 The preparation method of B@COFs includes the following steps:

[0022] Take containing 10 Organic ligand B is placed in a reaction vessel, heated to 130-195℃, and reacted for 10-15 hours, resulting in dehydration condensation to form... 10 B@COFs slurry, after solid-liquid separation and drying, yields the... 10 B@COFs.

[0023] The preparation method of the ceramic material for shielding gamma and neutron rays, as described above, includes the following steps:

[0024] Take the shielding layer material, heat it to 50-75℃, and while it is hot, cover the surface of the shielding layer with ultrafine carbon fibers, coat it with adhesive, and evenly spray protective particles to form a film and a protective layer, thus obtaining the ceramic material that shields gamma and neutron rays.

[0025] The beneficial effects of this invention are as follows:

[0026] In the ceramic material for shielding gamma and neutron rays of the present invention, the shielding layer material is introduced... 10 B@COFs and organic resins, along with the inclusion of tungsten alloy hollow spheres, ensure a stable and uniform distribution of the tungsten alloy spheres within the material system. This avoids problems such as cracking caused by localized shrinkage in high-temperature environments. The resulting ceramic material exhibits good structural stability and can maintain its structure and radiation shielding effect for extended periods. Furthermore, the COFs framework material incorporates... 10 B. The organic resins and rare earth-based ceramics incorporated into the ceramic material system have good shielding effects against both gamma rays and neutron rays. That is, the ceramic material containing tungsten alloy balls in this invention has a wide range of shielding effects and a more significant shielding effect. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0028] The present invention provides a ceramic material for shielding gamma and neutron rays, comprising a shielding layer and a protective layer covering both sides of the shielding layer, wherein the thickness of the protective layer does not exceed 22.5% of the thickness of the shielding layer.

[0029] In this invention, the shielding layer includes 10 B@COFs, organic resins, rare earth-based ceramics, and tungsten alloy spheres are prepared by the following steps:

[0030] (1) 10 B@COFs are mixed with organic resin, placed in a dispersion, and stirred for 5-60 minutes to obtain product A.

[0031] (2) Take product A, place it under stirring, add rare earth-based ceramics, control the stirring speed to 200-550 rpm, control the feeding speed of rare earth-based ceramics to 0.85-3.5 g / min, and obtain product B;

[0032] (3) Take another tungsten alloy ball, add a surfactant, stir, so that the surfactant is evenly coated on the surface of the tungsten alloy ball, then add product B, mix, press and shape to obtain a shielding layer.

[0033] in, 10 The mass ratio of B@COFs to organic resin is 1:0.5-0.8, the amount of rare earth-based ceramics accounts for 40-75% of the total mass of product A, the amount of tungsten alloy balls accounts for 80-112% of the total volume of product A, and the mass ratio of surfactant to tungsten alloy balls is 1-2.8:9-15.

[0034] In this invention, the above 10 The preparation method of B@COFs includes the following steps:

[0035] Isotope labeling 10 Benzene-1,3,5,-trimethyltriboronic acid (BTPA) of B is placed in a hydrothermal reactor and heated to 130-195°C for 10-15 hours to undergo dehydration condensation, which can form 10 B@COFs feed solution; after solid-liquid separation and vacuum drying, the following can be obtained: 10 B@COFs.

[0036] In this invention, the organic resin includes, but is not limited to, one or more of polyethylene, cyanate ester, epoxy resin, polyurethane, polyimide, or high hydrogen content polyethylene;

[0037] The dispersion includes a dispersant and a solvent. The dispersant includes, but is not limited to, one or more of methanol, acetone or dioxane, and the solvent includes, but is not limited to, one or more of deionized water, inorganic acid solution or alcohol solution.

[0038] Rare earth-based ceramics are prepared by rare earth oxides and zirconium oxide through high-temperature sintering and other processes. The rare earth oxides include, but are not limited to, one or two of cerium oxide, thulium oxide, erbium oxide, gadolinium oxide, zirconium oxide, and tantalum oxide.

[0039] Surfactants include, but are not limited to, one or more of oleic acid, oleylamine, dodecyl dimethyl benzyl ammonium chloride, or hexadecyl trimethyl ammonium chloride.

[0040] In this invention, the tungsten alloy sphere can be an existing tungsten alloy hollow sphere, referring to the tungsten alloy hollow sphere and its preparation method disclosed in patent CN115945684A.

[0041] In this invention, the protective layer includes ultrafine carbon fibers and protective particles. The protective particles can be made of lead-copper alloy powder. Those skilled in the art can also select materials with properties such as heat preservation, heat insulation, and flexibility as protective particles according to the needs of actual application scenarios, so as to give the ceramic material the same functional effects.

[0042] This invention also provides a method for preparing the above-mentioned ceramic material for shielding gamma and neutron rays, comprising the following steps:

[0043] Take the shielding material, heat it to 50-75℃, and while it is hot, cover the surface of the shielding layer with ultrafine carbon fibers, apply an appropriate amount of adhesive, and spray protective particles evenly. After the film is formed, a protective layer is formed, and a ceramic material that can shield gamma and neutron rays is obtained.

[0044] <Example>

[0045] Example 1

[0046] 1. Preparation 10 B@COFs:

[0047] Take 150g of isotope labeling 10 Benzene-1,3,5,-trimethyltriboronic acid of B was placed in a microwave hydrothermal reactor, the reactor power was controlled at 55W, and the mixture was heated to 165℃ and reacted for 12.3 hours. The raw material underwent a dehydration condensation reaction to obtain a product containing... 10 The B@COFs feed solution was then centrifuged at 3800 rpm for 5 minutes using a high-speed centrifuge, and then dried in a vacuum dryer at 275℃ for 3 hours to obtain... 10 B@COFs.

[0048] 2. Preparation of shielding layer materials:

[0049] Take 80g each 10 B@COFs, 35g polyethylene and 20g polyurethane were placed in an 80wt% methanol aqueous solution and stirred at 600rpm for 40min. While stirring, 75g of rare earth-based ceramics sintered from CeO2 and ZrO2 were added, with the stirring speed controlled at 300rpm and the feeding rate of rare earth-based ceramics at 2g / min, to obtain intermediate product X.

[0050] Take another 132g of tungsten alloy balls and mix them with 18.4g of dodecyl dimethyl benzyl ammonium chloride. Mix the dodecyl dimethyl benzyl ammonium chloride evenly with the surface of the tungsten alloy balls. Then add it to the above intermediate product X, mix, and hot press to make a shielding layer material with a thickness of 45mm.

[0051] 3. Preparation of ceramic materials for shielding gamma and neutron rays:

[0052] Take the above shielding layer material, heat it to 60°C, coat the surface of the shielding layer material with ultrafine carbon fiber powder while it is hot, and spray lead-copper alloy powder evenly. After drying, an 8mm coating is formed, that is, a protective layer material is formed on the surface of the shielding layer material, and a ceramic material that shields gamma and neutron rays is obtained.

[0053] Example 2

[0054] 1. Preparation 10 B@COFs:

[0055] Take 150g of isotope labeling 10 Benzene-1,3,5,-trimethyltriboronic acid of B was placed in a microwave hydrothermal reactor, the reactor power was controlled at 55W, and the mixture was heated to 165℃ and reacted for 12.3 hours. The raw material underwent a dehydration condensation reaction to obtain a product containing... 10 The B@COFs feed solution was then centrifuged at 3800 rpm for 5 minutes using a high-speed centrifuge, and then dried in a vacuum dryer at 275℃ for 3 hours to obtain... 10 B@COFs.

[0056] 2. Preparation of shielding layer materials:

[0057] Take 80g each 10 B@COFs, 20g polyethylene and 20g polyurethane were placed in an 80wt% methanol aqueous solution and stirred at 600rpm for 40min. While stirring, 64g of rare earth-based ceramics sintered from CeO2 and ZrO2 were added, with the stirring speed controlled at 300rpm and the feeding rate of rare earth-based ceramics at 2g / min, to obtain intermediate product X.

[0058] Take another 132g of tungsten alloy balls and mix them with 18.4g of dodecyl dimethyl benzyl ammonium chloride. Mix the dodecyl dimethyl benzyl ammonium chloride evenly with the surface of the tungsten alloy balls. Then add it to the above intermediate product X, mix, and hot press to make a shielding layer material with a thickness of 45mm.

[0059] 3. Preparation of ceramic materials for shielding gamma and neutron rays:

[0060] Take the above shielding layer material, heat it to 60°C, coat the surface of the shielding layer material with ultrafine carbon fiber powder while it is hot, and spray lead-copper alloy powder evenly. After drying, an 8mm coating is formed, that is, a protective layer material is formed on the surface of the shielding layer material, and a ceramic material that shields gamma and neutron rays is obtained.

[0061] Example 3

[0062] 1. Preparation 10 B@COFs:

[0063] Take 150g of isotope labeling 10 Benzene-1,3,5,-trimethyltriboronic acid of B was placed in a microwave hydrothermal reactor, the reactor power was controlled at 55W, and the mixture was heated to 165℃ and reacted for 12.3 hours. The raw material underwent a dehydration condensation reaction to obtain a product containing... 10The B@COFs feed solution was then centrifuged at 3800 rpm for 5 minutes using a high-speed centrifuge, and then dried in a vacuum dryer at 275℃ for 3 hours to obtain... 10 B@COFs.

[0064] 2. Preparation of shielding layer materials:

[0065] Take 80g each 10 B@COFs, 20g polyethylene and 20g polyurethane were placed in an 80wt% methanol aqueous solution and stirred at 600rpm for 40min. While stirring, 50g of rare earth-based ceramics sintered from CeO2 and ZrO2 were added, with the stirring speed controlled at 300rpm and the feeding rate of rare earth-based ceramics at 2g / min, to obtain intermediate product X.

[0066] Take another 132g of tungsten alloy balls and mix them with 18.4g of dodecyl dimethyl benzyl ammonium chloride. Mix the dodecyl dimethyl benzyl ammonium chloride evenly with the surface of the tungsten alloy balls. Then add it to the above intermediate product X, mix, and hot press to make a shielding layer material with a thickness of 45mm.

[0067] 3. Preparation of ceramic materials for shielding gamma and neutron rays:

[0068] Take the above shielding layer material, heat it to 60°C, coat the surface of the shielding layer material with ultrafine carbon fiber powder while it is hot, and spray lead-copper alloy powder evenly. After drying, an 8mm coating is formed, that is, a protective layer material is formed on the surface of the shielding layer material, and a ceramic material that shields gamma and neutron rays is obtained.

[0069] Example 4

[0070] 1. Preparation 10 B@COFs:

[0071] Take 150g of isotope labeling 10 Benzene-1,3,5,-trimethyltriboronic acid of B was placed in a microwave hydrothermal reactor, the reactor power was controlled at 55W, and the mixture was heated to 165℃ and reacted for 12.3 hours. The raw material underwent a dehydration condensation reaction to obtain a product containing... 10 The B@COFs feed solution was then centrifuged at 3800 rpm for 5 minutes using a high-speed centrifuge, and then dried in a vacuum dryer at 275℃ for 3 hours to obtain... 10 B@COFs.

[0072] 2. Preparation of shielding layer materials:

[0073] Take 80g each 10B@COFs, 35g polyethylene and 20g polyurethane were placed in an 80wt% methanol aqueous solution and stirred at 600rpm for 40min. While stirring, 75g of rare earth-based ceramics sintered from CeO2 and ZrO2 were added, with the stirring speed controlled at 300rpm and the feeding rate of rare earth-based ceramics at 2g / min, to obtain intermediate product X.

[0074] Take another 132g of tungsten alloy balls and mix them with 9.5g of dodecyl dimethyl benzyl ammonium chloride. Mix the dodecyl dimethyl benzyl ammonium chloride evenly with the surface of the tungsten alloy balls. Then add it to the above intermediate product X, mix, and then hot press to make a shielding layer material with a thickness of 45mm.

[0075] 3. Preparation of ceramic materials for shielding gamma and neutron rays:

[0076] Take the above shielding layer material, heat it to 60°C, coat the surface of the shielding layer material with ultrafine carbon fiber powder while it is hot, and spray lead-copper alloy powder evenly. After drying, an 8mm coating is formed, that is, a protective layer material is formed on the surface of the shielding layer material, and a ceramic material that shields gamma and neutron rays is obtained.

[0077] Example 5

[0078] 1. Preparation 10 B@COFs:

[0079] Take 150g of isotope labeling 10 Benzene-1,3,5,-trimethyltriboronic acid of B was placed in a microwave hydrothermal reactor, the reactor power was controlled at 55W, and the mixture was heated to 165℃ and reacted for 12.3 hours. The raw material underwent a dehydration condensation reaction to obtain a product containing... 10 The B@COFs feed solution was then centrifuged at 3800 rpm for 5 minutes using a high-speed centrifuge, and then dried in a vacuum dryer at 275℃ for 3 hours to obtain... 10 B@COFs.

[0080] 2. Preparation of shielding layer materials:

[0081] Take 80g each 10 B@COFs, 35g polyethylene and 20g polyurethane were placed in an 80wt% methanol aqueous solution and stirred at 600rpm for 40min. While stirring, 75g of rare earth-based ceramics sintered from CeO2 and ZrO2 were added, with the stirring speed controlled at 300rpm and the feeding rate of rare earth-based ceramics at 2g / min, to obtain intermediate product X.

[0082] Take another 132g of tungsten alloy balls and mix them with 18.4g of dodecyl dimethyl benzyl ammonium chloride. Mix the dodecyl dimethyl benzyl ammonium chloride evenly with the surface of the tungsten alloy balls. Then add it to the above intermediate product X, mix, and hot press to make a shielding layer material with a thickness of 45mm.

[0083] 3. Preparation of ceramic materials for shielding gamma and neutron rays:

[0084] Take the above shielding layer material, heat it to 60°C, coat the surface of the shielding layer material with ultrafine carbon fiber powder while it is hot, and spray lead-copper alloy powder evenly. After drying, a 2mm coating is formed, that is, a protective layer material is formed on the surface of the shielding layer material, and a ceramic material that shields gamma and neutron rays is obtained.

[0085] Example 6

[0086] 1. Preparation 10 B@COFs:

[0087] Take 150g of isotope labeling 10 Benzene-1,3,5,-trimethyltriboronic acid of B was placed in a microwave hydrothermal reactor, the reactor power was controlled at 55W, and the mixture was heated to 165℃ and reacted for 12.3 hours. The raw material underwent a dehydration condensation reaction to obtain a product containing... 10 The B@COFs feed solution was then centrifuged at 3800 rpm for 5 minutes using a high-speed centrifuge, and then dried in a vacuum dryer at 275℃ for 3 hours to obtain... 10 B@COFs.

[0088] 2. Preparation of shielding layer materials:

[0089] Take 80g each 10 B@COFs, 35g polyethylene and 20g polyurethane were placed in an 80wt% methanol aqueous solution and stirred at 600rpm for 10min. While stirring, 75g of rare earth-based ceramics sintered from CeO2 and ZrO2 were added, with the stirring speed controlled at 300rpm and the feeding rate of rare earth-based ceramics at 20g / min, to obtain intermediate product X.

[0090] Take another 132g of tungsten alloy balls and mix them with 18.4g of dodecyl dimethyl benzyl ammonium chloride. Mix the dodecyl dimethyl benzyl ammonium chloride evenly with the surface of the tungsten alloy balls. Then add it to the above intermediate product X, mix, and hot press to make a shielding layer material with a thickness of 45mm.

[0091] 3. Preparation of ceramic materials for shielding gamma and neutron rays:

[0092] Take the above shielding layer material, heat it to 60°C, coat the surface of the shielding layer material with ultrafine carbon fiber powder while it is hot, and spray lead-copper alloy powder evenly. After drying, an 8mm coating is formed, that is, a protective layer material is formed on the surface of the shielding layer material, and a ceramic material that shields gamma and neutron rays is obtained.

[0093] <Comparative Example>

[0094] Comparative Example 1

[0095] Take 80g each 10 B@COFs, 25g polyethylene, 20g polyurethane, 75g CeO2-ZrO2 rare earth-based ceramics, 132g tungsten alloy balls and 18.4g dodecyl dimethyl benzyl ammonium chloride were mixed and stirred at 600 rpm for 40 minutes. The mixture was then hot-pressed into a 45mm thick sheet.

[0096] Take the above-mentioned plate, heat it to 60°C, coat the surface of the shielding layer material with ultrafine carbon fiber powder while it is hot, and spray lead-copper alloy powder evenly. After drying, a film is formed to obtain a ceramic material for shielding radiation.

[0097] Comparative Example 2

[0098] Take 132g of tungsten alloy balls and mix them with 18.4g of dodecyl dimethyl benzyl ammonium chloride, so that the dodecyl dimethyl benzyl ammonium chloride is evenly adhered to the surface of the tungsten alloy balls;

[0099] Take another 80g 10 B@COFs are mixed with the above-treated tungsten alloy balls and hot-pressed into a 45mm thick plate.

[0100] Take the above-mentioned plate, heat it to 60°C, coat the surface of the shielding layer material with ultrafine carbon fiber powder while it is hot, and spray lead-copper alloy powder evenly. After drying, a film is formed to obtain a ceramic material for shielding radiation.

[0101] Comparative Example 3

[0102] Take 80g each 10 B@COFs, 25g polyethylene and 20g polyurethane were placed in an 80wt% methanol aqueous solution and stirred at 600rpm for 40min. While stirring, 75g of rare earth-based ceramics sintered from CeO2 and ZrO2 were added, with the stirring speed controlled at 300rpm and the feeding rate of rare earth-based ceramics at 2g / min, to obtain intermediate product X.

[0103] Another 132 g of tungsten alloy balls and 18.4 g of dodecyl dimethyl benzyl ammonium chloride were taken and stirred evenly to make the dodecyl dimethyl benzyl ammonium chloride adhere evenly to the surface of the tungsten alloy balls, and then they were added to the above intermediate product X, mixed, and hot-pressed into a 45-mm-thick ceramic material for shielding rays.

[0104] <Test Example>

[0105] Samples: Examples 1-6, Comparative Examples 1-3

[0106] (1) Material property test

[0107] The ceramic materials for shielding rays prepared in Examples 1-6 and Comparative Examples 1-3 above were taken, and a Sansi Zongheng strength tester was used to detect the properties such as the strength of the materials. The results are summarized in Table 1 below:

[0108] Table 1 Material properties of different ceramic materials

[0109] Sample width (mm) Sample height (mm) Maximum force (N) Bending strength (MPa) Example 1 6.35 5.25 6467 755.23 Example 2 6.24 5.25 6800 860.06 Example 3 6.38 5.25 6377 741.46 Example 4 6.39 5.27 5306 650.30 Example 5 6.33 5.25 5892 734.53 Example 6 6.36 5.25 6269 777.94 Comparative Example 1 6.32 5.25 6361 680.36 Comparative Example 2 6.35 5.25 5693 610.82 Comparative Example 3 6.33 5.26 6547 705.18

[0110] As can be seen from Table 1 above, compared with the ceramic materials in Comparative Examples 1-3, the ceramic materials prepared in Examples 1-6 have more advantages in bending strength. That is, the ray shielding material provided by the present invention can be applied to use scenarios with higher strength requirements and has better material properties.

[0111] (2) Ray shielding performance test

[0112] The ceramic materials for shielding rays prepared in Examples 1-6 and Comparative Examples 1-3 above were taken, and the shielding effects of the materials on gamma rays and neutron rays were respectively tested at the initial stage and after one week of use. The results are summarized in Table 2 and Table 3 below:

[0113] Table 2 Initial ray shielding performance of different ceramic materials

[0114]

[0115]

[0116] Table 3 Ray shielding performance of different ceramic materials after one week of use

[0117]

[0118] As can be seen from Table 2 above, compared with Comparative Examples 1-3, the ceramic materials prepared in Examples 1-6 have a larger attenuation coefficient for the gamma rays emitted by the 137 Cs source and have a stronger shielding effect, and have a lower neutron transmittance for the neutrons generated by the 241 Am-Be source, that is, the shielding effect on neutron rays is more significant;

[0119] A comparison of the measurement results in Tables 2 and 3 shows that the ceramic materials in Examples 1-6 maintained a relatively stable shielding effect against gamma rays and neutron rays after a certain period of use; however, the ceramic materials in Comparative Examples 1-3 showed a significant decrease in shielding effect against gamma rays and neutron rays after a certain period of use. Therefore, the ceramic material proposed in this invention has a more stable structure and material properties, thus maintaining a longer-lasting radiation shielding effect.

[0120] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A ceramic material for shielding gamma and neutron rays, characterized in that, Includes a shielding layer and a protective layer covering the surface of the shielding layer; The method for preparing the shielding layer includes the following steps: A1 Take 10 B@COFs and organic resin were placed in a dispersion and stirred to obtain product A; 10 The preparation method of B@COFs includes the following steps: taking a sample containing... 10 Organic ligand B is placed in a reaction vessel, heated to 130-195℃, and reacted for 10-15 hours, resulting in dehydration condensation to form... 10 B@COFs slurry, after solid-liquid separation and drying, yields the... 10 B@COFs; A2 Take product A, add rare earth-based ceramics at a uniform rate while stirring, and wait until it is fully mixed to obtain product B; A3 Take another tungsten alloy ball, add a surfactant, stir and mix well, then add product B, mix, press and shape to obtain a shielding layer; In step A1, 10 The mass ratio of B@COFs to organic resin is 1:0.5-0.8; The rare earth-based ceramic is prepared by sintering rare earth oxides and zirconium oxide; wherein, the rare earth oxides include one or two of cerium oxide, thulium oxide, erbium oxide, and gadolinium oxide; the amount of rare earth-based ceramic is 40-75% of the total mass of product A, and the amount of tungsten alloy balls is 80-112% of the total volume of product A.

2. The ceramic material for shielding gamma and neutron rays according to claim 1, characterized in that, The organic resin includes one or more of polyethylene, cyanate ester, epoxy resin, polyurethane, polyimide, or high-hydrogen polyethylene.

3. The ceramic material for shielding gamma and neutron rays according to claim 1, characterized in that, Surfactants include one or more of oleic acid, oleylamine, dodecyl dimethyl benzyl ammonium chloride, or hexadecyl trimethyl ammonium chloride.

4. The ceramic material for shielding gamma and neutron rays according to claim 3, characterized in that, The mass ratio of surfactant to tungsten alloy balls is 1-2.8:9-15.

5. The ceramic material for shielding gamma and neutron rays according to claim 1, characterized in that, The thickness of the protective layer is ≤ 22.5% of the thickness of the shielding layer.

6. The method for preparing the ceramic material for shielding gamma and neutron rays as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Take the shielding layer material, heat it to 50-75℃, and while it is hot, cover the surface of the shielding layer with ultrafine carbon fibers, coat it with adhesive, and evenly spray protective particles to form a film and a protective layer, thus obtaining the ceramic material that shields gamma and neutron rays.

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