A method for producing a high-purity cubic fluorite-structure dysprosium titanate powder neutron-absorbing material for a nuclear reactor core

Abstract

This invention discloses a method for preparing high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores, comprising the following steps: S1, ball milling and mixing: Dy2O3 powder and TiO2 powder are dried to completely remove crystal water, and then mixed at a molar ratio of Dy2O3 powder to TiO2 powder of 1:(1~1.2), followed by high-energy mechanical ball milling to obtain a mixed powder; S2, pre-sintering: the mixed powder after high-energy mechanical ball milling is heated at a heating rate of 5~10℃ / min. After holding at 1300-1600℃ for 3-12 hours, the material is cooled to room temperature in the furnace to obtain calcined dysprosium titanate; S3, Smelting: The calcined dysprosium titanate is heated to complete melting, and then the melt is allowed to cool naturally at room temperature. After solidification, as-cast dysprosium titanate is obtained; S4, Mechanical crushing of ingots: The re-solidified as-cast dysprosium titanate is subjected to jaw crushing, high-energy mechanical ball milling, and then the crushed powder is sieved to obtain high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material for nuclear reactor cores.

Description

Technical Field

[0001] This invention belongs to the field of nuclear reactor technology, specifically relating to a method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores. Background Technology

[0002] Neutron-absorbing materials in nuclear reactor cores are key components for ensuring the controllability and safety of nuclear reactions. Their core function is to efficiently absorb excess neutrons and prevent runaway chain reactions. Dysprosium titanate has advantages such as good chemical stability, high melting point (1870℃), no reaction with cladding materials at 1000℃, and no "gas release" or "swelling" after neutron irradiation, making it a popular material for nuclear reactor control rods.

[0003] When dysprosium titanate is used in control rods, it can be used as a core or as powder to fill the cladding. Currently, there are several processes for preparing dysprosium titanate ceramic cores. Existing technology (patent number CN 105161144A) uses a one-step method of ball milling → cold isostatic pressing → sintering to prepare dysprosium titanate cores. However, this process, with a maximum temperature of only 1450℃, suffers from structural instability due to the presence of the hexagonal phase, leading to significant irradiation swelling and other problems. Existing technology (patent number CN 113213916B) adds molybdenum oxide as a stabilizer to prepare dysprosium titanate, achieving a cubic fluorite structure. However, the presence of molybdenum oxide reduces the purity of the dysprosium titanate material, and molybdenum oxide may segregate at grain boundaries during sintering, forming weak bonding interfaces. This increases the material's brittleness and reduces fracture toughness, especially under high temperature or irradiation stress, easily inducing microcracks. Therefore, while the introduction of molybdenum oxide stabilizer lowers the sintering temperature, it sacrifices long-term structural reliability. The dysprosium titanate prepared by the above two methods is used in the form of a core. The dense core is prone to microcracks due to stress concentration, which accelerates material failure and makes it susceptible to local fluctuations in the absorption cross-section caused by manufacturing defects. However, when dysprosium titanate is used as a powder, the pores between the particles can absorb the volume expansion caused by irradiation, reducing the overall structural stress. In addition, the powder particles can independently respond to phase transformation stress, avoiding the risk of overall core cracking.

[0004] To address the aforementioned issues, there is an urgent need to develop an efficient and low-cost method for preparing fluorite-phase dysprosium titanate powder materials. This method should be able to directly obtain high-purity, fine-grained, and uniformly distributed powder materials while ensuring precise and controllable composition, in order to meet the stringent performance requirements of nuclear reactors for neutron-absorbing materials. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a method for preparing high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores. This method employs ball milling mixing → pre-sintering → smelting → mechanical crushing of ingots, simplifying the preparation process, reducing economic costs, and requiring simple equipment. The high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material prepared by this method has a cubic fluorite structure, does not introduce molybdenum oxide components, has high purity, uniform microstructure, high tap density, fine grains, good thermal conductivity, and excellent radiation resistance. It can be used as a neutron absorber material for preparing control rods in nuclear reactors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores includes the following steps:

[0008] S1. Ball milling and mixing: After drying Dy2O3 powder and TiO2 powder to completely remove crystal water, they are mixed at a molar ratio of Dy2O3 powder to TiO2 powder of 1:(1~1.2) and then ball milled by high energy machinery to obtain mixed powder.

[0009] S2. Pre-sintering: The mixed powder after high-energy mechanical ball milling is heated to 1300-1600℃ at a heating rate of 5-10℃ / min and held for 3-12 hours. Then it is cooled to room temperature in the furnace to obtain dysprosium titanate calcined material.

[0010] S3. Melting: The calcined dysprosium titanate is heated to complete melting, and then the melt is allowed to cool naturally at room temperature. After solidification, as-cast dysprosium titanate is obtained.

[0011] S4. Mechanical crushing of ingots: The resolidified cast dysprosium titanate is subjected to jaw crushing, high-energy mechanical ball milling, and then the crushed powder is sieved to obtain high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material of the required shape for nuclear reactor cores. The parameters of high-energy mechanical ball milling are as follows: ball milling loading coefficient is 0.2 to 0.8, ball-to-material ratio is (1 to 50):1, ball milling speed is 100 to 500 rpm, ball milling time is 0.2 to 0.5 hours, and the ball milling media includes two specifications of grinding balls, Φ15mm and Φ20mm, with a ratio of 1:1.

[0012] Preferably, the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material used in the nuclear reactor core has a phase composition of cubic fluorite Dy2TiO5, space group Fd3m(227), and cell parameters of [missing information]. α=β=γ=90.0°; In the crystal structure of the high-purity cubic fluorite structure dysprosium titanate powder neutron absorber material used in the nuclear reactor core, Dy contains 2 crystallographic sites, Ti contains 1 crystallographic site, and O contains 2 crystallographic sites; among them, Dy1 atom is located at (0,0,0), with an occupancy of 1; Dy2 atom shares the (1 / 2,1 / 2,1 / 2) site with Ti1 atom, with occupancy rates of 0.3 and 0.65 respectively; O1 atom is located at (1 / 8,1 / 8,1 / 8), with an occupancy of 1; O2 atom is located at (2 / 5,1 / 8,1 / 8), with an occupancy rate of 0.916; Dy 2+ and Ti 4 + By sharing site 16, a mixed occupancy is formed, resulting in a [Li1 / 3Ti5 / 3]16d type solid solution structure; O1 forms a cubic close-packed framework, and the local distortion of O2 leads to a 0.916 occupancy, which is consistent with the oxygen arrangement pattern in face-centered cubic metals.

[0013] Preferably, the tap density of the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material used in the nuclear reactor core is not less than 5.00 g / cm³. 3 .

[0014] Preferably, in step S1, the parameters of the high-energy mechanical ball mill are: ball mill filling coefficient of 0.2 to 0.8, ball-to-material ratio of (1 to 50):1, ball mill speed of 100 to 500 rpm, and ball milling time of 0.5 to 1 hour.

[0015] Preferably, in step S1, the purity of Dy2O3 powder is not less than 99.99%, and the purity of TiO2 powder is not less than 99.9%.

[0016] Preferably, in step S1, the average particle size of both Dy2O3 powder and TiO2 powder is 10-20 μm.

[0017] Preferably, in step S1, the impurities in the high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material for the nuclear reactor core are all elements except Dy, Ti, and O, and the total impurity content does not exceed 0.2% of the total mass of the high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material for the nuclear reactor core.

[0018] Preferably, in step S3, the calcined dysprosium titanate is heated and melted at a temperature of 1870℃~1920℃, and cooled at a temperature of 18℃~25℃.

[0019] A high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores is prepared using the same preparation method described above.

[0020] Application of a high-purity cubic fluorite-structured dysprosium titanate powder neutron absorbing material for nuclear reactor cores, wherein the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorbing material for nuclear reactor cores is used as a neutron absorbing material to prepare control rods in nuclear reactors.

[0021] By adopting the above technical solution, the present invention has the following beneficial effects:

[0022] 1. The high-temperature treatment in the pre-sintering stage of this invention can increase the contact area between powder particles and form an initial metallurgical bond. It can also initially eliminate component segregation through atomic diffusion, reduce the risk of phase separation in the melting stage, and ensure the consistency of material properties. The preliminary densification structure formed by pre-sintering can reduce the temperature and time required for melting, which helps to reduce energy consumption and avoid defects caused by high temperature.

[0023] 2. The smelting-ingot mechanical crushing method of this invention can directly obtain high-purity, fine-grained, and uniformly distributed powder materials while ensuring precise control of composition. The tap density of the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material used in nuclear reactor cores is greater than 5.0 g / cm³. 3 The main crystal phase is Dy2TiO5 with a fluorite structure, which has good neutron absorption capacity.

[0024] 3. The high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material for nuclear reactor cores of the present invention can optimize the packing density within the cladding through particle size distribution methods, balancing neutron absorption efficiency and swelling buffer space. Compared to the need for complete replacement of core blocks with localized damage, when used as powder, localized irradiation damage only affects a small number of powder particles, which can be repaired by vibration filling, making it suitable for high burnup deep reactors. Attached Figure Description

[0025] Figure 1 This is an X-ray diffraction pattern of the high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores prepared in Example 1 of this invention.

[0026] Figure 2 The particle size distribution of the high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores prepared in Example 2 of this invention was determined by laser diffraction.

[0027] Figure 3 The images show SEM images and energy spectrum scan results of the high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores prepared in Example 1 of this invention.

[0028] Figure 4 The images show TEM images, electron diffraction patterns, and energy spectrum scan results of the high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores prepared in Example 1 of this invention.

[0029] Figure 5 This is a schematic diagram of the cell structure of the high-purity cubic fluorite structure dysprosium titanate powder neutron absorber material for nuclear reactor cores prepared in Examples 1 to 3 of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] like Figure 1 As shown.

[0032] Example 1

[0033] A method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores includes the following steps:

[0034] (1) Dry Dy2O3 powder and TiO2 powder with a purity of not less than 99.99% in a drying oven at 100℃ for 24 hours to completely remove the water of crystallization. Mix Dy2O3 powder and TiO2 powder at a molar ratio of 1:1, ball mill filling coefficient of 0.5, ball-to-material ratio of 5:1, ball mill speed of 500 rpm, and ball milling time of 1 hour.

[0035] (2) The mixed powder after high-energy ball milling is heated to 1350℃ at 8℃ / min, held for 12 hours and then cooled in the furnace to obtain dysprosium titanate calcined material.

[0036] (3) Place the calcined dysprosium titanate material in an induction heating furnace and heat it to 1920°C until it is completely melted. Quickly pour the melt into a mold and then allow it to cool naturally at room temperature to 18°C ​​to 25°C to solidify and obtain cast dysprosium titanate.

[0037] (4) Jaw crushing was performed on the solidified cast dysprosium titanate, and then high-energy mechanical ball milling was performed using two types of grinding balls, Φ15mm and Φ20mm (in a ratio of 1:1). The ball milling loading coefficient was 0.5, the ball-to-material ratio was 20:1, the ball milling speed was 300 rpm, and the ball milling time was 0.5 hours.

[0038] (5) After crushing, the powders of different particle sizes are graded to obtain the high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material for nuclear reactor cores of the required shape.

[0039] Example 2

[0040] A method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores includes the following steps:

[0041] (1) Dry Dy2O3 powder and TiO2 powder with a purity of not less than 99.99% in a drying oven at 100℃ for 24 hours to completely remove the water of crystallization. Mix Dy2O3 powder and TiO2 powder at a molar ratio of 1:1.1, with a ball milling filling coefficient of 0.5, a ball-to-material ratio of 5:1, a ball milling speed of 500 rpm, and a ball milling time of 1 hour.

[0042] (2) The mixed powder after high-energy ball milling is heated to 1450℃ at 8℃ / min, held for 8 hours and then cooled in the furnace to obtain dysprosium titanate calcined material.

[0043] (3) Place the calcined dysprosium titanate material in an induction heating furnace and heat it to 1900°C until it is completely melted. Quickly pour the melt into a mold and then allow it to cool naturally at room temperature to 18°C ​​to 25°C to solidify and obtain cast dysprosium titanate.

[0044] (4) Jaw crushing was performed on the solidified cast dysprosium titanate, and then high-energy mechanical ball milling was performed using two types of grinding balls, Φ15mm and Φ20mm (in a ratio of 1:1). The ball milling loading coefficient was 0.5, the ball-to-material ratio was 20:1, the ball milling speed was 300 rpm, and the ball milling time was 0.3 hours.

[0045] (5) After crushing and sieving, the powders of different particle sizes are graded to obtain high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material for nuclear reactor cores of the required shape.

[0046] Example 3

[0047] A method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores includes the following steps:

[0048] (1) Dry Dy2O3 powder and TiO2 powder with a purity of not less than 99.99% in a drying oven at 100℃ for 24 hours to completely remove the water of crystallization. Mix Dy2O3 powder and TiO2 powder at a molar ratio of 1:1.15, ball mill filling coefficient of 0.5, ball-to-material ratio of 5:1, ball mill speed of 500 rpm, and ball milling time of 1 hour.

[0049] (2) The mixed powder after high-energy ball milling is heated to 1550℃ at 8℃ / min, held for 6 hours and then cooled in the furnace to obtain dysprosium titanate calcined material.

[0050] (3) Place the calcined dysprosium titanate material in an induction heating furnace and heat it to 1880°C until it is completely melted. Quickly pour the melt into a mold and then allow it to cool naturally at room temperature to 18°C ​​to 25°C to solidify and obtain cast dysprosium titanate.

[0051] (4) Jaw crushing was performed on the solidified cast dysprosium titanate, and then high-energy mechanical ball milling was performed using two types of grinding balls, Φ15mm and Φ20mm (in a ratio of 1:1). The ball milling loading coefficient was 0.5, the ball-to-material ratio was 20:1, the ball milling speed was 300 rpm, and the ball milling time was 0.4 hours.

[0052] (5) After crushing and sieving, the powders of different particle sizes are graded to obtain high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material for nuclear reactor cores of the required shape.

[0053] Performance testing:

[0054] The X-ray diffraction pattern of the high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores prepared in Example 1 of this invention is shown below. Figure 1 As shown.

[0055] The particle size distribution of the high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores prepared in Example 2 of this invention, as determined by laser diffraction, is shown in the figure below. Figure 2 As shown.

[0056] The SEM images and energy dispersive spectral lines of the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores prepared in Example 1 of this invention are as follows: Figure 3 As shown.

[0057] TEM images, electron diffraction patterns, and energy dispersive spectroscopy (EDS) results of the high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores prepared in Example 1 of this invention are as follows: Figure 4 As shown.

[0058] The schematic diagrams of the cell structures of the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber materials for nuclear reactor cores prepared in Examples 1 to 3 of this invention are shown below. Figure 5 As shown. Among them, Dy1 is a Dy atom; Dy2 (labeled as Dy,Ti) is a mixed occupying atom; O1 and O2 are oxygen atoms.

[0059] The density test results of the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber materials for nuclear reactor cores prepared in Examples 1 to 3 of this invention under various gradation ratios are shown in Table 1.

[0060] The specific surface area of ​​the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores prepared in Example 1 of this invention, as determined by the gas adsorption BET method, is shown in Table 2.

[0061] The Rietveld refined crystallographic parameters of the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber materials for nuclear reactor cores prepared in Examples 1 to 3 of this invention are shown in Table 3.

[0062] Table 1: Density test results of high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber materials for nuclear reactor cores prepared in Examples 1 to 3 under various gradations.

[0063]

[0064] Table 2: Specific surface area test results of the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor core prepared in Example 1, determined by gas adsorption BET method.

[0065]

[0066] Table 3: Rietveld refined crystallographic parameters of high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber materials for nuclear reactor cores prepared in Examples 1 to 3.

[0067]

[0068] The high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber materials for nuclear reactor cores prepared in Examples 1 to 3 all have a cubic fluorite structure of Dy2TiO5 and can be used to prepare nuclear reactor control rods.

[0069] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron-absorbing material for nuclear reactor cores, characterized in that, Includes the following steps: S1. Ball milling and mixing: After drying Dy2O3 powder and TiO2 powder to completely remove crystal water, they are mixed at a molar ratio of Dy2O3 powder to TiO2 powder of 1:(1~1.2) and then ball milled by high energy machinery to obtain mixed powder. S2. Pre-sintering: The mixed powder after high-energy mechanical ball milling is heated to 1300-1600℃ at a heating rate of 5-10℃ / min and held for 3-12 hours. Then it is cooled to room temperature in the furnace to obtain dysprosium titanate calcined material. S3. Melting: The calcined dysprosium titanate is heated to complete melting, and then the melt is allowed to cool naturally at room temperature. After solidification, as-cast dysprosium titanate is obtained. S4. Mechanical crushing of ingots: The resolidified cast dysprosium titanate is subjected to jaw crushing, high-energy mechanical ball milling, and then the crushed powder is sieved to obtain high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material of the required shape for nuclear reactor cores. The parameters of high-energy mechanical ball milling are as follows: ball milling loading coefficient is 0.2 to 0.8, ball-to-material ratio is (1 to 50):1, ball milling speed is 100 to 500 rpm, ball milling time is 0.2 to 0.5 hours, and the ball milling media includes two specifications of grinding balls, Φ15mm and Φ20mm, with a ratio of 1:

1.

2. The method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores as described in claim 1, characterized in that: The high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material used in the reactor core has a phase composition of Dy₂TiO₅ with a cubic fluorite structure, space group Fd₃m, and cell parameters of [missing information]. α=β=γ=90.0°; In the crystal structure of the high-purity cubic fluorite structure dysprosium titanate powder neutron absorber material used in the nuclear reactor core, Dy contains 2 crystallographic sites, Ti contains 1 crystallographic site, and O contains 2 crystallographic sites; among them, Dy1 atom is located at (0,0,0), with an occupancy of 1; Dy2 atom shares the (1 / 2,1 / 2,1 / 2) site with Ti1 atom, with occupancy rates of 0.3 and 0.65 respectively; O1 atom is located at (1 / 8,1 / 8,1 / 8), with an occupancy of 1; O2 atom is located at (2 / 5,1 / 8,1 / 8), with an occupancy rate of 0.916; Dy 2+ and Ti 4+ By sharing site 16, a mixed occupancy is formed, resulting in a [Li1 / 3Ti5 / 3]16d type solid solution structure; O1 forms a cubic close-packed framework, and the local distortion of O2 leads to a 0.916 occupancy, which is consistent with the oxygen arrangement pattern in face-centered cubic metals.

3. The method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores as described in claim 1, characterized in that: The tap density of the high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material used in the reactor core is not less than 5.00 g / cm³. 3 .

4. The method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores as described in claim 1, characterized in that, In step S1, the parameters of the high-energy mechanical ball mill are: ball mill filling coefficient of 0.2 to 0.8, ball-to-material ratio of (1 to 50):1, ball mill speed of 100 to 500 rpm, and ball milling time of 0.5 to 1 hour.

5. The method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores as described in claim 1, characterized in that: In step S1, the purity of Dy2O3 powder is not less than 99.99%, and the purity of TiO2 powder is not less than 99.9%.

6. The method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores as described in claim 1, characterized in that: In step S1, the average particle size of both Dy2O3 powder and TiO2 powder is 10-20 μm.

7. The method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores as described in claim 1, characterized in that: In step S1, the impurities in the high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material used in the nuclear reactor core are all elements except Dy, Ti, and O, and the total impurity content does not exceed 0.2% of the total mass of the high-purity cubic fluorite structured dysprosium titanate powder neutron absorber material used in the nuclear reactor core.

8. The method for preparing a high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores as described in claim 1, characterized in that: In step S3, the calcined dysprosium titanate is heated and melted at a temperature of 1870℃~1920℃, and cooled at a temperature of 18℃~25℃.

9. A high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores, characterized in that: The high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for the nuclear reactor core is prepared using the preparation method for high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor core as described in any one of claims 1-8.

10. The application of a high-purity cubic fluorite-structured dysprosium titanate powder neutron absorber material for nuclear reactor cores as described in claim 9, characterized in that: The reactor core uses high-purity cubic fluorite-structured dysprosium titanate powder as a neutron-absorbing material to prepare control rods in the nuclear reactor.

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