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A nuclear reactor core neutron absorbing material terbium titanate pellet and its preparation method

A technology for nuclear reactors and absorbing materials, which is applied in the control of nuclear reactions, reactors, and manufacturing reactors, etc. It can solve the problems of foreign impurities increasing the preparation cost, difficulty in obtaining dense green bodies, and increasing the complexity of the preparation process, so as to reduce pre-grinding and calcination Process, isotropic shrinkage is uniform, the effect of fine grain

Active Publication Date: 2017-12-22
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in this process, including (1) grinding the dry and agglomerated sample into fine powder, and then calcining it in a corundum crucible at 750°C for 1 hour, which increases the complexity of the preparation process and brings more foreign impurities. Increase the preparation cost; (2) adopt the cold state uniaxial molding technology to preform the powder first, which leads to the complexity of the preparation process, the increase of controllable factors, and the increase of production cost, which is not conducive to industrial production; (3) the use of cold etc. 2 minutes of static pressure is short, and it is not easy to obtain a dense green body

Method used

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  • A nuclear reactor core neutron absorbing material terbium titanate pellet and its preparation method
  • A nuclear reactor core neutron absorbing material terbium titanate pellet and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0028] 1) Tb with a purity of 99.9% and a particle size of 5 μm 4 O 7 Powder and TiO with a purity of 99.9% and a particle size of 50nm 2 The powders were dried in a vacuum oven at 70-150°C for more than 10 hours to completely remove the crystal water, and then press Tb 4 O 7 Powder and TiO 2 The molar ratio of the powder is 1:2, and the ball milling is carried out. The filling factor of the ball mill is 0.5, the ball-to-material ratio is 1:1, the ball milling speed is 100 rpm, and the ball milling time is 24 hours to obtain a mixed powder with a nano-scale grain size; the ball milling process Due to the impact of the high-energy grinding ball, the powder will be broken or extended, the surface energy is high, and it is easy to agglomerate or adhere to the wall of the spherical tank, which makes it difficult to refine the powder. 1% total mass of stearic acid process control agent to prevent sticking;

[0029] 2) The above mixed powder is put into the package, placed in t...

Embodiment 2

[0033] 1) Tb with a purity of 99.9% and a particle size of 5 μm 4 O 7 Powder and TiO with a purity of 99.9% and a particle size of 50nm 2 The powders were dried in a vacuum oven at 70-150°C for more than 10 hours to completely remove the crystal water, and then press Tb 4 O 7 Powder and TiO 2 The molar ratio of the powders is 1:2, and the ball milling is carried out. The filling factor of the ball milling is 0.8, the ball-to-material ratio is 50:1, the ball milling speed is 1000 rpm, and the ball milling time is 1 hour to obtain the mixed powder with nano-scale grains. , due to the impact of the high-energy grinding ball, the powder will be broken or extended, the surface energy is high, and it is easy to agglomerate or adhere to the wall of the spherical tank, which makes it difficult to refine the powder. 1% by mass of stearic acid process control agent prevents sticking;

[0034] 2) Put the above-mentioned mixed powder into a package, place it in the hydraulic cylinder...

Embodiment 3

[0038] 1) Tb with a purity of 99.9% and a particle size of 5 μm 4 O 7 Powder and TiO with a purity of 99.9% and a particle size of 50nm 2 The powders were dried in a vacuum oven at 70-150°C for more than 10 hours to completely remove the crystal water, and then press Tb 4 O 7 Powder and TiO 2 The molar ratio of the powders is 1:2, and the ball milling is carried out. The filling factor of the ball milling is 0.5, the ball-to-material ratio is 10:1, the ball milling speed is 200 rpm, and the ball milling time is 120 hours to obtain the mixed powder with nano-scale grains. , due to the impact of the high-energy grinding ball, the powder will be broken or extended, the surface energy is high, and it is easy to agglomerate or adhere to the wall of the spherical tank, which makes it difficult to refine the powder. 1% by mass of stearic acid process control agent prevents sticking;

[0039] 2) Put the above-mentioned mixed powder into a package, place it in the hydraulic cylind...

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Abstract

The invention discloses a preparation method of a nuclear reactor core neutron absorbing material terbium titanate pellet. The preparation method of the terbium titanate pellet consists of ball milling, cold isostatic pressing and sintering, also the preparation technology is simplified, the economic cost is low, the needed equipment is simple, and the obtained terbium titanate pellet has uniform structure and superior performance.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant reactors, and in particular relates to a nuclear reactor core neutron absorption material terbium titanate pellet and a preparation method thereof. Background technique [0002] In the actual operation of a nuclear power plant, the control of reactivity is generally achieved by adjusting the position of the control rod, the concentration of boric acid and the inlet temperature of the core coolant. The inlet temperature of the core cooling water is related to the physical conditions of the primary loop and cannot be changed at will. The reactivity control caused by this change is greatly restricted in engineering. Therefore, the control rod and boric acid concentration are generally used as control variables to realize the reactor load following control. The lifting and insertion of the control rod assembly can realize the control of the operating power of the reactor, and the rapid in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/18G21C7/24C01G23/00
CPCY02E30/30
Inventor 冉广王珂刘腾蛟黄金华王鲁闽冯楚蓉李宁张彬彬
Owner XIAMEN UNIV
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