A rare earth boride-containing magnesium phosphate cement-based neutron shielding material and a preparation method and application thereof
By preparing magnesium phosphate cement-based materials containing rare earth borides, the problems of aging of neutron shielding materials and high costs of traditional repair methods have been solved. This has resulted in neutron shielding materials with rapid solidification, high strength, and excellent neutron shielding performance, which are suitable for improving the safety and economy of nuclear power plants.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
- Filing Date
- 2026-01-26
- Publication Date
- 2026-06-09
AI Technical Summary
Existing neutron shielding materials are prone to aging and damage during long-term use. Traditional repair methods are costly and ineffective. Excessive B4C addition affects the mechanical properties of cement and causes it to swell after absorbing neutrons, leading to a reduced service life.
Magnesium phosphate cement-based material containing rare earth borides was prepared by weighing and mixing a solid mixture of reburned magnesium oxide, potassium dihydrogen phosphate, boric acid and rare earth borides with water. The material has rapid solidification and high neutron shielding performance. RExBy ceramic particles were added to improve the performance.
A neutron shielding material with rapid repair and stable performance has been developed. It has high compressive strength, high temperature resistance and corrosion resistance, and excellent neutron shielding performance, meeting the needs of rapid repair, shortening construction time and improving safety and economy.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of neutron shielding materials technology, and relates to a magnesium phosphate cement-based neutron shielding material containing rare earth borides, its preparation method and application. Background Technology
[0002] With the continuous growth of global energy demand, nuclear power, as an efficient, stable, and clean energy source, occupies an increasingly important position in the global energy structure. However, the operation of nuclear power plants is accompanied by potential neutron radiation risks. Neutrons are particles with no electric charge and a large mass, possessing strong penetrating power and easily penetrating inorganic materials, causing serious harm to human health and the environment. Therefore, effectively shielding against neutron radiation is one of the key measures to ensure the safe operation of nuclear power plants.
[0003] Currently, the most widely used neutron shielding material is boron-containing polyethylene (B4C) shielding board. This material effectively absorbs neutron radiation by adding boron, thereby reducing radiation levels. However, during long-term use, B4C shielding boards may experience aging and damage due to factors such as high temperature, corrosion, and radiation, requiring timely repair. Traditional repair methods, however, suffer from problems such as long repair times, high costs, and unsatisfactory results. Some researchers have tried adding boron carbide (B4C) to improve the performance of neutron shielding materials. However, this method has drawbacks: the neutron absorption performance of B4C-added shielding materials remains low, and excessive amounts can affect the mechanical properties of the cement. Furthermore, B4C swells during service after absorbing neutrons, further degrading the cement's performance and affecting its service life.
[0004] Therefore, developing neutron shielding materials that can be rapidly repaired and have stable performance is of great significance for improving the safety and economy of nuclear power plants. Summary of the Invention
[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a method for preparing a magnesium phosphate cement-based neutron shielding material containing rare earth borides, which features short solidification time, good adaptability to extreme environments, good neutron shielding performance, simple process, and low carbon and environmental friendliness.
[0006] One objective of this invention is achieved through the following technical solution: A method for preparing a magnesium phosphate cement-based neutron shielding material containing rare earth borides includes the following steps: Weigh out a solid mixture comprising 40-55 wt% reburned magnesium oxide, 30-50 wt% potassium dihydrogen phosphate, 0.1-3 wt% boric acid, and 1-20 wt% rare earth borides, mix it with water at a solid-liquid ratio of 0.1-0.25, fill the mixture into a mold, cure it at 25±3℃ for 0.1-5 h, and then air-oxygenate it for 1-6 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth borides; The molecular formula of the rare earth boride is RE x B y RE includes at least one of Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, where 0.5 ≤ x ≤ 2 and 2 ≤ y ≤ 6.
[0007] Preferably, the recalcined magnesium oxide is obtained by sintering magnesium oxide at 1500~1700℃ for 1~12h.
[0008] Further preferred, the recalcined magnesium oxide is obtained by sintering magnesium oxide at 1600°C for 6 hours.
[0009] More preferably, the average particle size of the magnesium oxide is 30~120μm.
[0010] Preferably, the average particle size of the recalcined magnesium oxide is 10~120μm.
[0011] Preferably, the potassium dihydrogen phosphate has an average particle size of 30~120μm.
[0012] Preferably, the mass ratio of the recalcined magnesium oxide to potassium dihydrogen phosphate is (1.01~1.50):1.
[0013] Further preferably, the mass ratio of the recalcined magnesium oxide to potassium dihydrogen phosphate is 1.2:1.
[0014] Preferably, the rare earth boride has an average particle size of 10~100μm.
[0015] Further preferably, the average particle size of the rare earth boride is 30~80μm.
[0016] Preferably, the rare earth boride is at least one of GdB4 and DyB4.
[0017] Preferably, the amount of rare earth borides added is 5-15 wt%.
[0018] As a preferred embodiment, the preparation method of magnesium phosphate cement-based neutron shielding material containing rare earth borides includes the following steps: Weigh out a solid mixture comprising 43-52 wt% reburned magnesium oxide, 35-45 wt% potassium dihydrogen phosphate, 1 wt% boric acid, and 5-20 wt% rare earth borides, mix it with water at a solid-liquid ratio of 0.18, fill the mixture into a mold, cure it at 25±3℃ for 1 hour, and then air-oxygenate it for 3 days to obtain a magnesium phosphate cement-based neutron shielding material containing rare earth borides. The rare earth boride is at least one of GdB4 and DyB4; The magnesium phosphate cement-based neutron shielding material containing rare earth boride has a compressive strength >25 MPa and a neutron shielding capacity ≥98%.
[0019] A further preferred method for preparing magnesium phosphate cement-based neutron shielding material containing rare earth borides includes the following steps: Weigh out a solid mixture comprising 51.3 wt% reburned magnesium oxide, 42.7 wt% potassium dihydrogen phosphate, 1 wt% boric acid, and 5 wt% rare earth borides, mix it with water at a solid-liquid ratio of 0.18, fill the mixture into a mold, cure it at 25±3℃ for 1 hour, and then air-oxygenate it for 3 days to obtain a magnesium phosphate cement-based neutron shielding material containing rare earth borides. The molecular formula of the rare earth boride is GdB4. The 0.13cm thick magnesium phosphate cement-based neutron shielding material has a compressive strength ≥45MPa and a neutron shielding capability ≥99.5%.
[0020] More preferably, the neutron shielding capability of the magnesium phosphate cement-based neutron shielding material containing rare earth boride with a thickness ≥0.24cm reaches 100%.
[0021] The second objective of this invention is achieved through the following technical solution: A magnesium phosphate cement-based neutron shielding material containing rare earth borides is prepared by the above-described method.
[0022] Preferably, the initial setting time of the magnesium phosphate cement-based neutron shielding material containing rare earth boride is <20 min.
[0023] Further preferably, the initial setting time of the magnesium phosphate cement-based neutron shielding material containing rare earth boride is <15 min.
[0024] Preferably, the magnesium phosphate cement-based neutron shielding material containing rare earth boride with a thickness of ≥0.13cm has a neutron shielding capacity of ≥98% and a compressive strength of ≥25MPa.
[0025] Further preferably, the magnesium phosphate cement-based neutron shielding material containing rare earth boride with a thickness of ≥0.13cm has a neutron shielding capacity of ≥98% and a compressive strength of ≥40MPa.
[0026] More preferably, the magnesium phosphate cement-based neutron shielding material containing rare earth boride with a thickness of ≥0.13cm has a neutron shielding capacity of ≥99.5% and a compressive strength of ≥46MPa.
[0027] Preferably, the magnesium phosphate cement-based neutron shielding material containing rare earth boride with a thickness ≥0.24cm has a neutron shielding capacity of 100% and a compressive strength ≥48MPa.
[0028] The third objective of this invention is achieved through the following technical solution: Application of a magnesium phosphate cement-based neutron shielding material containing rare earth borides in nuclear power plant materials.
[0029] As a preferred application, the application includes: simulating the service environment of nuclear power plant materials in an autoclave, wrapping the outer wall of the reactor with a magnesium phosphate cement-based neutron shielding material containing rare earth boride with a thickness of 13~50mm, and a neutron shielding capability of ≥98%.
[0030] Compared with the prior art, the present invention has the following beneficial effects: 1. In the preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth borides of the present invention, RE is added... x B y Ceramic particles significantly improve the neutron shielding performance of magnesium phosphate cement; 2. The magnesium phosphate cement-based neutron shielding material containing rare earth boride of the present invention has both the basic characteristics of ordinary cement such as hydraulicity and plasticity, and the advantages of ceramic materials such as high compressive strength, high temperature resistance, corrosion resistance and good chemical stability. 3. The magnesium phosphate cement-based neutron shielding material containing rare earth borides of the present invention can achieve high strength within a short curing period and has excellent neutron shielding performance, fully meeting the requirements for use of neutron shielding substrates for rapid repair. Detailed Implementation
[0031] The technical solution of the present invention will be further described and illustrated below through specific embodiments. It should be understood that the specific embodiments described herein are only for the purpose of helping to understand the present invention and are not intended to limit the present invention.
[0032] Unless otherwise specified, the raw materials used in the embodiments of the present invention are all commonly used in the art, and the methods used in the embodiments are all conventional methods in the art.
[0033] In this paper, the preparation method of calcined magnesium oxide includes: placing magnesium oxide powder in a crucible, putting it into a muffle furnace, heating it to 1600℃ and sintering it for 6 hours, cooling it and then grinding it into powder.
[0034] If recalcined magnesium oxide obtained by sintering at 1450℃ is used, the solidification time of the resulting magnesium phosphate cement-based neutron shielding material containing rare earth borides will be too fast.
[0035] In this paper, a solid-liquid ratio of 0.18 means that the mass ratio of the solid mixture to water is 1:0.18, and a solid-liquid ratio of 0.30 means that the mass ratio of the solid mixture to water is 1:0.30.
[0036] The tests in this article include: Neutron shielding capability was calculated theoretically: the neutron shielding performance of magnesium phosphate cement was simulated using MCNP.
[0037] Compression resistance: Six cylinders with a diameter of 6 mm and a height of 15 mm were prepared for each sample group, and their compression resistance was tested using a universal testing machine. Initial setting time: The room temperature setting time test was conducted in accordance with the relevant requirements of GB / T1346-2001 Cement Standard Consistency Water Requirement, Setting Time and Soundness Test Method.
[0038] Example 1 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GdB4 in this embodiment includes: Weigh out 51.3 wt% of reburned magnesium oxide, 42.7 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 5 wt% of rare earth boride GdB4. Mix with water at a solid-liquid ratio of 0.18 and fill into a mold. After curing at 25±3℃ for 1 hour, air oxygen curing is carried out for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0039] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GdB4 in this embodiment is shown in Table 1.
[0040] Example 2 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GdB4 in this embodiment includes: Weigh out 45.8 wt% of reburned magnesium oxide, 38.2 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 15 wt% of rare earth boride GdB4. Mix with water at a solid-liquid ratio of 0.18 and fill into a mold. After curing at 25±3℃ for 1 hour, air oxygen curing is carried out for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0041] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GdB4 in this embodiment is shown in Table 1.
[0042] Example 3 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GdB4 in this embodiment includes: Weigh out 43.1 wt% of reburned magnesium oxide, 35.9 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 20 wt% of rare earth boride GdB4. Mix with water at a solid-liquid ratio of 0.18 and fill into a mold. After curing at 25±3℃ for 1 hour, air oxygen curing is carried out for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0043] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GdB4 in this embodiment is shown in Table 1.
[0044] Example 4 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride DyB4 in this embodiment includes: Weigh out 51.3 wt% of reburned magnesium oxide, 42.7 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 5 wt% of rare earth boride DyB4. Mix with water at a solid-liquid ratio of 0.18 and fill into a mold. After curing at 25±3℃ for 1 hour, air oxygen curing is carried out for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0045] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride DyB4 in this embodiment is shown in Table 1.
[0046] Example 5 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride DyB4 in this embodiment includes: Weigh out 45.8 wt% of reburned magnesium oxide, 38.2 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 15 wt% of rare earth boride DyB4. Mix with water at a solid-liquid ratio of 0.18 and fill into a mold. After curing at 25±3℃ for 1 hour, air oxygen curing is carried out for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0047] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride DyB4 in this embodiment is shown in Table 1.
[0048] Example 6 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride DyB4 in this embodiment includes: Weigh out 43.1 wt% of reburned magnesium oxide, 35.9 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 20 wt% of rare earth boride DyB4. Mix with water at a solid-liquid ratio of 0.18 and fill into a mold. After curing at 25±3℃ for 1 hour, air oxygen curing is carried out for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0049] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride DyB4 in this embodiment is shown in Table 1.
[0050] Example 7 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GbB4 in this embodiment includes: Weigh out 53.5 wt% of reburned magnesium oxide, 44.5 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 1 wt% of rare earth boride GbB4. Mix them with water at a solid-liquid ratio of 0.18 and fill the mixture into a mold. After curing at 25±3℃ for 1 hour, the mixture is then air-cured for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0051] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GbB4 in this embodiment is shown in Table 1.
[0052] Comparative Example 1 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GbB4 in this comparative example includes: Weigh out 37.6 wt% of reburned magnesium oxide, 31.4 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 30 wt% of rare earth boride GbB4. Mix with water at a solid-liquid ratio of 0.18 and fill into a mold. After curing at 25±3℃ for 1 hour, air oxygen curing is carried out for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0053] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GbB4 in this comparative example is shown in Table 1.
[0054] Comparative Example 2 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride DyB4 in this comparative example includes: Weigh out 37.6 wt% of reburned magnesium oxide, 31.4 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 30 wt% of rare earth boride DyB4. Mix with water at a solid-liquid ratio of 0.18 and fill into a mold. After curing at 25±3℃ for 1 hour, air oxygen curing is carried out for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0055] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride DyB4 in this comparative example is shown in Table 1.
[0056] Comparative Example 3 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GbB4 in this comparative example includes: Weigh out 51.3 wt% of reburned magnesium oxide, 42.7 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 5 wt% of rare earth boride GdB4. Mix with water at a solid-liquid ratio of 0.30 and fill into a mold. After curing at 25±3℃ for 1 hour, air oxygen curing is carried out for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0057] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GbB4 in this comparative example is shown in Table 1.
[0058] Comparative Example 4 The preparation method of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GbB4 in this comparative example includes: Weigh out 49.1 wt% of reburned magnesium oxide, 40.9 wt% of potassium dihydrogen phosphate, 5 wt% of boric acid, and 5 wt% of rare earth boride GdB4. Mix them with water at a solid-liquid ratio of 0.18 and fill the mixture into a mold. After curing at 25±3℃ for 1 hour, the mixture is then air-cured for 3 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth boride.
[0059] The performance of the magnesium phosphate cement-based neutron shielding material containing rare earth boride GbB4 in this comparative example is shown in Table 1.
[0060] Comparative Example 5 The preparation method of the magnesium phosphate cement-based neutron shielding material in this comparative example includes: Weigh out 54.0 wt% of reburned magnesium oxide, 45.0 wt% of potassium dihydrogen phosphate, and 1 wt% of boric acid, mix them with water at a solid-liquid ratio of 0.18, fill the mixture into a mold, cure at 25±3℃ for 1 hour, and then air-oxygenate for 3 days to obtain magnesium phosphate cement-based neutron shielding material.
[0061] The performance of the magnesium phosphate cement-based neutron shielding material in this comparative example is shown in Table 1.
[0062] Comparative Example 6 The preparation method of the magnesium phosphate cement-based neutron shielding material in this comparative example includes: Weigh out 47.0 wt% of reburned magnesium oxide, 47.0 wt% of potassium dihydrogen phosphate, 1 wt% of boric acid, and 5 wt% of rare earth boride GdB4. Mix them with water at a solid-liquid ratio of 0.18 and fill the mixture into a mold. After curing at 25±3℃ for 1 hour, the mixture is then air-cured for 3 days to obtain magnesium phosphate cement-based neutron shielding material.
[0063] The performance of the magnesium phosphate cement-based neutron shielding material in this comparative example is shown in Table 1.
[0064] Table 1. Performance Data of Magnesium Phosphate Cement-Based Neutron Shielding Materials
[0065] As shown in the table above, the magnesium phosphate cement-based neutron shielding material containing rare earth boride of the present invention has good neutron shielding performance, a short initial setting time, effectively shortens the construction time and improves construction efficiency; and it only needs to be oxygenated in the air for 3 days to achieve high compressibility, effectively extending the oxygenation time in the air, and the performance changes little.
[0066] As can be seen from Examples 1-3 and 7, the neutron shielding performance gradually increases with the increase of rare earth boride content, but the compressibility performance first increases and then decreases; and in Comparative Example 1, the amount of rare earth boride content is too large, resulting in poor compressibility performance.
[0067] Compared with Comparative Example 5, which does not contain rare earth borides, the neutron shielding performance of the magnesium phosphate cement-based neutron shielding material containing rare earth borides in Example 1 is significantly better. Compared with the existing cement-based neutron shielding materials containing boron carbide, the magnesium phosphate cement-based neutron shielding material containing rare earth borides in Example 1 has significant advantages: it can achieve better neutron shielding effect with lower additive content and thinner material thickness.
[0068] In summary, the rare earth boride-containing magnesium phosphate cement-based neutron shielding material of the present invention exhibits rapid initial setting, achieves high strength within a short curing period, and demonstrates excellent neutron shielding performance, effectively meeting the core requirements of rapid repair scenarios for the substrate.
[0069] All aspects, embodiments, and features of this invention should be considered illustrative in all respects and not limiting of the invention; the scope of the invention is defined only by the claims. Other embodiments, modifications, and uses will become apparent to those skilled in the art without departing from the spirit and scope of the invention as claimed.
[0070] In the preparation method of this invention, the order of the steps is not limited to the listed order. For those skilled in the art, variations in the order of the steps without creative effort are also within the scope of protection of this invention. Furthermore, two or more steps or actions can be performed simultaneously.
[0071] Finally, it should be noted that the specific embodiments described herein are merely illustrative examples of the invention and are not intended to limit the implementation of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them; it is neither necessary nor possible to exemplify all embodiments here. However, these obvious variations or modifications derived from the essential spirit of the invention still fall within the scope of protection of the invention, and interpreting them as any additional limitation would contradict the spirit of the invention.
Claims
1. A method for preparing a magnesium phosphate cement-based neutron shielding material containing rare earth borides, characterized in that, The preparation method includes the following steps: Weigh out a solid mixture comprising 40-55 wt% reburned magnesium oxide, 30-50 wt% potassium dihydrogen phosphate, 0.1-3 wt% boric acid, and 1-20 wt% rare earth borides, mix it with water at a solid-liquid ratio of 0.1-0.25, fill the mixture into a mold, cure it at 25±3℃ for 0.1-5 h, and then air-oxygenate it for 1-6 days to obtain magnesium phosphate cement-based neutron shielding material containing rare earth borides; The molecular formula of the rare earth boride is RE x B y RE includes at least one of Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, where 0.5 ≤ x ≤ 2 and 2 ≤ y ≤ 6.
2. The method for preparing the magnesium phosphate cement-based neutron shielding material containing rare earth borides according to claim 1, characterized in that, The reburned magnesium oxide is obtained by sintering magnesium oxide at 1500~1700℃ for 1~12h.
3. The method for preparing the magnesium phosphate cement-based neutron shielding material containing rare earth borides according to claim 1, characterized in that, The mass ratio of the recalcined magnesium oxide to potassium dihydrogen phosphate is (1.01~1.50):
1.
4. The method for preparing the magnesium phosphate cement-based neutron shielding material containing rare earth borides according to claim 1, characterized in that, The average particle size of the recalcined magnesium oxide is 10~120μm; the average particle size of the potassium dihydrogen phosphate is 30~120μm.
5. The method for preparing the magnesium phosphate cement-based neutron shielding material containing rare earth borides according to claim 1, characterized in that, The rare earth boride is at least one of GdB4 and DyB4.
6. A magnesium phosphate cement-based neutron shielding material containing rare earth borides, characterized in that, It is prepared by the method of preparing magnesium phosphate cement-based neutron shielding material containing rare earth boride as described in any one of claims 1 to 5.
7. The magnesium phosphate cement-based neutron shielding material containing rare earth borides according to claim 6, characterized in that, The initial setting time of the magnesium phosphate cement-based neutron shielding material containing rare earth borides is <20 min.
8. The magnesium phosphate cement-based neutron shielding material containing rare earth borides according to claim 6, characterized in that, The neutron shielding material, which contains rare earth boride and has a thickness of ≥0.13cm, has a neutron shielding capacity of ≥98% and a compressive strength of ≥25MPa.
9. The magnesium phosphate cement-based neutron shielding material containing rare earth borides according to claim 6, characterized in that, The magnesium phosphate cement-based neutron shielding material containing rare earth boride with a thickness of ≥0.24cm has a neutron shielding capacity of 100% and a compressive strength of ≥48MPa.
10. The application of a magnesium phosphate cement-based neutron shielding material containing rare earth borides as described in claims 5-9 in nuclear power plant materials, characterized in that, The application includes: simulating the service environment of nuclear power plant materials inside a high-pressure reactor, wrapping the outer wall of the reactor with magnesium phosphate cement-based neutron shielding material containing rare earth boride with a thickness of 13~50mm, with a neutron shielding capability of ≥98%.