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Europium hafnate neutron absorbing material and application thereof

A technology of absorbing material, europium hafnium acid, applied in reactors, nuclear reaction control, nuclear power generation and other directions, can solve the problems of shortening the service life of materials, sample degradation and performance degradation, and achieve long-term stability, stable comprehensive properties, melting point and other problems. high effect

Inactive Publication Date: 2020-02-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the actual service process, different parts of the material have different abilities to resist neutron irradiation, corrosion, stress, temperature, etc., and different parts have different properties and performances such as heat conduction, thermal expansion coefficient, radiation swelling and radiation growth. It will lead to premature local degradation and performance degradation of the sample, shortening the service life of the material, etc.

Method used

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  • Europium hafnate neutron absorbing material and application thereof
  • Europium hafnate neutron absorbing material and application thereof
  • Europium hafnate neutron absorbing material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take the dried hafnium oxide powder with a purity of 99.9% and the dried europium oxide powder with a purity of 99.9%, under the protection of an inert gas, according to the molar percentage of Hf 2 o 3 -50% Eu 2 o 3 (i.e. mass percentage Hf 2 o 3 -62.57wt.%Eu 2 o 3 ) mixed after weighing, then add the process control agent stearic acid and make its final mass concentration no more than 1.5wt.%, to obtain the initial mixed powder, put into the ball mill jar and tighten the ball mill jar lid. The above initial mixed powder was ball-milled for 120 hours under the conditions of ball-to-material ratio of 10:1, filling coefficient of 0.5, and ball milling speed of 500 rpm to obtain ball-milled powder. In a glove box protected by inert gas argon, put the mixed powder of the ball mill for 30 hours into a rubber sheath and tighten the seal, then place the tight rubber sheath in the hydraulic cylinder of the cold isostatic pressing instrument, Cold isostatic pressing for ...

Embodiment 2

[0044] Take the dried hafnium oxide powder with a purity of 99.9% and the dried europium oxide powder with a purity of 99.9%, under the protection of an inert gas, according to the molar percentage of Hf 2 o 3 -47.29% Eu 2 o 3 (mass percentage Hf 2 o 3 -60wt.%Eu 2 o 3) mixed after weighing, then add the process control agent stearic acid and make its final mass concentration no more than 1.5wt.%, to obtain the initial mixed powder, put into the ball mill jar and tighten the ball mill jar lid. The above initial mixed powder was ball-milled for 30 hours under the conditions of ball-to-material ratio of 10:1, filling coefficient of 0.5, and ball milling speed of 500 rpm to obtain ball-milled powder. In a glove box protected by inert gas argon, put the mixed powder of the ball mill for 30 hours into a rubber sheath and tighten the seal, then place the tight rubber sheath in the hydraulic cylinder of the cold isostatic pressing instrument, Cold isostatic pressing for 2h unde...

Embodiment 3

[0049] Take the dried hafnium oxide powder with a purity of 99.9% and the dried europium oxide powder with a purity of 99.9%, under the protection of an inert gas, according to the molar percentage of Hf 2 o 3 -47.29% Eu 2 o 3 (mass percentage Hf 2 o 3 -60wt.%Eu 2 o 3 ) mixed after weighing, then add the process control agent stearic acid and make its final mass concentration no more than 1.5wt.%, to obtain the initial mixed powder, put into the ball mill jar and tighten the ball mill jar lid. The above initial mixed powder was ball milled for 8 hours under the conditions of a ball-to-material ratio of 10:1, a filling coefficient of 0.5, and a ball milling speed of 500 rpm to obtain a ball milled powder. Put the above-mentioned ball milling powder in the mould, place the mold in the furnace cavity of the vacuum hot pressing sintering furnace, and vacuum the furnace cavity to 10 -3 Below Pa; apply a pressure of 100MPa, then heat up to 1200°C at a rate of 15°C / min for hot...

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Abstract

The invention discloses a europium hafnate neutron absorbing material and application thereof. The europium hafnate neutron absorbing material is prepared through a ball milling-isostatic cool pressing-sintering or ball milling-hot pressed sintering technological process by adopting raw materials including hafnium oxide powder and europium oxide powder; the europium hafnate neutron absorbing material always keeps a single fluorite crystal structure within the range from the room temperature to 2200 DEG C; the mass percentage of europium oxide is 55.78 percent by weight to 65.34 percent by weight; and the mass percentage of hafnium oxide is 34.66 percent by weight to 44.22 percent by weight. The europium hafnate neutron absorbing material provided by the invention has excellent and stable combination properties such as neutron absorption, heat conduction, mechanical property and radiation resistance; the transformation of the crystal structure and the decomposition of a phase cannot occur along with the temperature change; and a mixed phase with different crystal structures and a mixed phases with different phases cannot occur in the material.

Description

technical field [0001] The invention belongs to the technical field of neutron absorbing materials, and in particular relates to a neutron absorbing material of europium hafnate and its application. Background technique [0002] The start, stop and nuclear power adjustment of nuclear power plant reactors are mainly controlled by the control rods in the core, which contain elements with large thermal neutron absorption cross-sections (such as B, In, Cd, Dy, Tm, Hf, Gd, Eu, Sm, etc.) neutron absorbing material; it has fast moving speed, reliable operation, flexible use, and high accuracy of controlling reactivity. Moreover, in the event of an accident, all control rods will automatically and quickly fall to stop the chain fission reaction in the reactor and ensure the safety of the nuclear reactor. Common neutron absorbing materials for control rods include boron carbide (B 4 C), boron steel, Ag-In-Cd, dysprosium oxide, B 4 C and Ag-In-Cd combination, etc. For control rods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C04B35/64C04B35/645G21C7/24G21F1/02
CPCC04B35/50C04B35/622C04B35/64C04B35/645C04B2235/3244C04B2235/658G21C7/24G21F1/02Y02E30/30
Inventor 冉广丛烁黄闽江李奕鹏
Owner XIAMEN UNIV
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