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Nuclear reactor core neutron absorbing material terbium titanate pellet and preparation method thereof

A technology for nuclear reactors and absorbing materials, which is applied in the control of nuclear reactions, reactors, and manufacturing reactors. It can solve the problems of foreign impurities increasing the preparation cost, increasing the complexity of the preparation process, and not being able to obtain dense green bodies, so as to reduce pre-grinding and calcination. Process, isotropic shrinkage is uniform, the effect of fine grain

Active Publication Date: 2015-12-23
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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  • Nuclear reactor core neutron absorbing material terbium titanate pellet and preparation method thereof
  • Nuclear reactor core neutron absorbing material terbium titanate pellet and preparation method thereof

Examples

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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 powder is dried in a vacuum oven at 70-150°C for more than 10 hours to completely remove the crystal water, and 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 ball milling filling factor is 0.5, the ball material ratio is 1:1, the ball milling speed is 100rpm, and the ball milling time is 24 hours to obtain a mixed powder with a grain size of nanoscale; the ball milling process In the 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. You can add no more than the mixed powder The stearic acid process control agent of total mass 1% prevents adhesion;

[0029] 2) Put the above-...

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 powder is dried in a vacuum oven at 70-150°C for more than 10 hours to completely remove the crystal water, and press Tb 4 o 7 Powder and TiO 2 The molar ratio of the powder is 1:2 and ball milling is carried out. The ball milling coefficient is 0.8, the ball-to-material ratio is 50:1, the ball milling speed is 1000rpm, and the ball milling time is 1 hour to obtain a mixed powder with nanoscale grains; during the ball milling process , due to the impact of the high-energy grinding balls, 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. You can add no more than the total amount of mixed powder Quality 1% stearic acid process control agent prevents adhesion;

[0034] 2) Put the above-mentioned mix...

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 powder is dried in a vacuum oven at 70-150°C for more than 10 hours to completely remove the crystal water, and 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 10:1, the ball milling speed is 200rpm, and the ball milling time is 120 hours to obtain a mixed powder with nanoscale grains; during the ball milling process , due to the impact of the high-energy grinding balls, 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. You can add no more than the total amount of mixed powder Quality 1% stearic acid process control agent prevents adhesion;

[0039] 2) Put the above-...

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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, in particular to a nuclear reactor core neutron absorbing material terbium titanate pellet and a preparation method thereof. Background technique [0002] In the actual operation of nuclear power plants, the reactivity control is generally achieved by adjusting the position of the control rods, 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 circuit and cannot be changed arbitrarily. The reactivity control caused by this change is greatly restricted in engineering. Therefore, control rods and boric acid concentration are generally used as control variables to realize 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 introduction of n...

Claims

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Application Information

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Patent Type & Authority Applications(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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