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A method for growing uranium dioxide crystals using alumina flux

A technology of uranium dioxide and flux, which is used in chemical instruments and methods, melts from molten solvents, and single crystal growth, etc., to reduce radiation swelling and fission gas release, avoid oxidation, and improve safety. Effect

Inactive Publication Date: 2021-04-20
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for growing uranium dioxide crystals using alumina flux, to solve the thermal problem of uranium dioxide ceramic fuel rods, and to expand its application in semiconductor, solar energy, thermoelectric and other fields

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  • A method for growing uranium dioxide crystals using alumina flux
  • A method for growing uranium dioxide crystals using alumina flux
  • A method for growing uranium dioxide crystals using alumina flux

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example 1

[0034] The purity is 99.99% UO 2 Raw materials and 99.9% Al 2 o 3 The raw materials are mixed and ground according to the molar ratio of 76.9:23.1, and the UO 2 -Al 2 o 3The raw materials are pressed and formed into 18×40mm dense cylindrical pellets; the cylindrical pellets are put into a tungsten crucible, the tungsten crucible is placed in a graphite crucible, and the graphite crucible is sealed; the graphite crucible is placed in the induction copper of a high-frequency induction heating device In the middle of the coil, the induction copper coil is fed with circulating cooling water to take away the heat of the system and maintain the temperature balance of the system; the inside of the heating furnace is filled with heat insulating powder to keep warm, and Ar / H2 (5% vol.) is introduced to start the induction heating device. Use high-frequency induction heating to raise the temperature to 2600°C, keep it warm for 12 hours, fully melt the uranium dioxide raw material, c...

example 2

[0036] The purity is 99.99% UO 2 Raw materials and 99.9% Al 2 o 3 The raw materials are mixed and ground according to the molar ratio of 77.2:22.8, and the UO 2 -Al 2 o 3 The raw materials are pressed and formed into 18×40mm dense cylindrical pellets; the cylindrical pellets are put into a tungsten crucible, the tungsten crucible is placed in a graphite crucible, and the graphite crucible is sealed; the graphite crucible is placed in the induction copper of a high-frequency induction heating device In the middle of the coil, circulating cooling water is introduced into the induction copper coil to take away the heat of the system and maintain the temperature balance of the system;

[0037] Fill the inside of the heating furnace with insulation powder to keep it warm, and pass Ar / H 2 (5% vol.), start the induction heating device, use high-frequency induction heating to raise the temperature to 2600 ° C, keep it for 12 hours, fully melt the uranium dioxide raw material, and...

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Abstract

The application of the present invention belongs to the technical field of crystal growth, and specifically discloses a method for growing uranium dioxide crystals using alumina flux, comprising the following steps: (1) adding UO 2 ‑Al 2 o 3 The raw materials are uniformly mixed according to the designed molar ratio, and then pressed into pellets; (2) the pellets in step (1) are loaded into a tungsten crucible and placed in a graphite crucible; (3) the graphite crucible in step (2) Place in the middle of the induction coil of the high-frequency induction heating device; (4) heat to fully melt the raw material, and obtain a uranium dioxide crystal ingot after slow cooling; (5) separate the flux and the crystal in the obtained crystal ingot to obtain a uranium dioxide single crystal . This scheme is mainly used to prepare uranium dioxide single crystals. In order to study the physical and chemical properties of single crystals, and then solve the problem of radiation swelling caused by the fission products produced by nuclear fuel rods during the fission process, the problem of interaction between fuel and cladding is also expanded. Applications in semiconductor, solar and thermoelectric fields.

Description

technical field [0001] The invention belongs to the technical field of crystal growth, and specifically discloses a method for growing uranium dioxide crystals by using an alumina flux. Background technique [0002] Uranium dioxide (UO 2 ) belongs to the cubic crystal system, with a melting point of 2878°C and a boiling point of 3500°C. Uranium dioxide is an important nuclear material and the most widely used nuclear fuel for power reactors. The melting point of uranium dioxide is as high as 2878°C, which expands the available operating temperature of the reactor; UO 2 Good irradiation stability, can maintain its stable size and shape after long-term irradiation; UO 2 Below the melting point there is only one crystalline form, which is isotropic. Uranium dioxide is also an excellent semiconductor material with a bandwidth of about 1.3eV, which is between silicon and gallium arsenide. Uranium dioxide is close to the efficiency-bandwidth curve for optimal absorption of so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/16C30B9/12
CPCC30B9/12C30B29/16
Inventor 徐家跃潘芸芳李志超周鼎田甜
Owner SHANGHAI INST OF TECH
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