A kind of fluoride ceramic crucible and its manufacturing method

A manufacturing method and technology of ceramic crucibles, applied in the fields of fluoride ceramic crucibles and their manufacture, fluoride corrosion-resistant crucibles and their manufacture, can solve problems such as poor resistance to fluoride corrosion, and achieve safe production, corrosion prevention, and stability The effect of the reaction environment

Active Publication Date: 2017-11-07
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can effectively solve the problem of poor fluoride corrosion resistance of existing equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A fluoride ceramic crucible, the specific preparation method is as follows:

[0038] (1) Using calcium fluoride ceramic powder (300 mesh particle size, 99.95% purity) as the crucible base material, the calcium fluoride ceramic powder was first vacuum heat-treated at 800°C for 2 hours, and the vacuum degree was 10 -2 Pa, then crush the agglomerated powder and pass through an 80-mesh sieve to obtain calcium fluoride ceramic powder under the sieve.

[0039] (2) Add sintering aid lead fluoride (1000 orders of particle size, purity is 99.9%) in calcium fluoride ceramic powder under the sieve, wherein, lead fluoride addition is 1% of the total mass of ceramic powder and sintering aid, After mixing for 20 hours by dry method, pass through an 80-mesh sieve again to obtain the under-sieved mixed powder.

[0040] (3) Put the under-sieved mixed powder into the designed crucible mold with a relative filling density of about 40%, and then release it after cold isostatic pressing at...

Embodiment 2

[0045] A fluoride ceramic crucible, the specific preparation method is as follows:

[0046] (1) Using calcium fluoride ceramic powder (300 mesh size, 99.95% purity) as the base material of the crucible, the calcium fluoride ceramic powder is subjected to a high temperature vacuum heat treatment at 800°C for 2 hours, and the vacuum degree is 10 -2 Pa. Afterwards, the agglomerated powder was crushed and passed through a 80-mesh sieve to obtain under-sieved calcium fluoride ceramic powder.

[0047] (2) Add sintering aid lead fluoride (1000 orders of particle size, purity is 99.9%) in calcium fluoride ceramic powder under the sieve, wherein, lead fluoride addition is 1% of the total mass of ceramic powder and sintering aid, After mixing the powder for 20 hours, pass through an 80-mesh sieve again to obtain the under-sieved mixed powder.

[0048] (3) Put the under-sieved mixed powder into the designed crucible mold with a relative filling density of about 40%, and then release it...

Embodiment 3

[0053] A fluoride ceramic crucible, the specific preparation method is as follows:

[0054] (1) Using calcium fluoride ceramic powder (300 mesh particle size, 99.95% purity) as the base material of the crucible, the calcium fluoride ceramic powder is subjected to a high temperature vacuum heat treatment at 800°C for 2 hours, and the vacuum degree is 10 -2 Pa, then crush the agglomerated powder and pass through an 80-mesh sieve to obtain calcium fluoride ceramic powder under the sieve.

[0055] (2) Add sintering aid lead fluoride (1000 orders of particle size, purity is 99.9%) in calcium fluoride ceramic powder under the sieve, wherein, lead fluoride addition is 1% of the total mass of ceramic powder and sintering aid, After mixing the powder for 20 hours, pass through an 80-mesh sieve again to obtain the under-sieved mixed powder.

[0056] (3) Put the under-sieve mixed powder into the designed crucible mold with a relative filling density of about 40%, and then release it aft...

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Abstract

The invention discloses a fluoride ceramic crucible and a preparation method thereof. The base material of the crucible is composed of fluoride ceramic powder. The fluoride ceramic powder is heat-treated, and then the treated fluoride ceramic powder is crushed and sieved; Add sintering aids to the final fluoride ceramic powder, mix evenly, and sieve; put the under-sieve powder into the designed crucible mold for preforming; sinter the formed fluoride crucible, and finally machine it to meet the product requirements Specification. The invention is mainly used in the equipment of the fluorination and volatilization process in the dry method. The crucible can provide a stable reaction environment in the process of post-treatment of spent fuel by the fluorination and volatilization method, and prevent fluorine gas and fluorination volatiles from affecting the equipment. Corrosion to ensure safe production.

Description

technical field [0001] The invention relates to a fluoride corrosion-resistant crucible and a manufacturing method thereof, in particular to a fluoride ceramic crucible and a manufacturing method thereof. The ceramic crucible obtained by the method can resist fluoride corrosion at high temperature, and belongs to the field of powder metallurgy. Background technique [0002] When nuclear fuel is used in a reactor, due to the consumption of fissile nuclides, the generation of fission products and heavy nuclides, the fuel reactivity changes, and finally the reactor can no longer maintain criticality, so the nuclear fuel must be replaced to a certain extent. This irradiated fuel is also called spent fuel or irradiated fuel. On the one hand, these spent fuels contain a large amount of radioactive elements, which are highly radioactive, so they must be handled properly; Fissile materials 239Pu, 235U or 233U, and transuranium elements such as neptunium, americium, and curium produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/553C04B35/64
Inventor 刘国辉杨怀超姚惠龙刘桂荣王铁军
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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