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Method for preparing plate-shaped all-ceramic-coated fuel pellets by integrated molding

A technology for coating fuel and ceramics, which is applied in the manufacture of reactors, reducing greenhouse gases, and reactors. It can solve the problems of difficulty in co-firing the fuel-free zone and SiC matrix ceramics, uneven distribution of TRISO particles, and difficulty in preparing the fuel-free zone. Achieve the effect of low cost, convenient engineering application and short production cycle

Active Publication Date: 2019-07-02
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problems to be solved by the present invention are: the existing FCM fuel preparation has complicated steps, difficult engineering application, difficulty in co-firing the fuel-free zone and SiC matrix ceramics, uneven distribution of TRISO particles in the preparation process, and difficulty in preparing the fuel-free zone. problem, the purpose is to provide a method for preparing plate-shaped full-ceramic-coated fuel pellets by integrated molding that solves the above-mentioned problems

Method used

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  • Method for preparing plate-shaped all-ceramic-coated fuel pellets by integrated molding
  • Method for preparing plate-shaped all-ceramic-coated fuel pellets by integrated molding
  • Method for preparing plate-shaped all-ceramic-coated fuel pellets by integrated molding

Examples

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Effect test

Embodiment 1

[0067] A method for preparing a plate-shaped full-ceramic-coated fuel pellet through integrated molding, comprising:

[0068] (1) SiC / TRISO composite green tape and single SiC green tape were prepared respectively;

[0069] The specific preparation method is: mix SiC short fibers with a length of 2 o 3 and Y 2 o 3 . The ball milling medium is absolute ethanol, the mixing balls are dense SiC balls, the ball-to-material ratio is 10:1, the mixing time is 8 hours, and then dried at 60°C to obtain the mixed powder. Mix the obtained mixed powder with 35wt% solvent and 1% tetramethylammonium hydroxide, and ball mill for 8 hours to obtain a stable dispersed suspension; wherein the solvent is a mixed liquid composed of alcohol and toluene, and the volume ratio of alcohol to toluene in the mixed liquid is It is 2:3. Add 6wt% PVB, 3wt% dibutyl phthalate and 1wt% n-butanol to the suspension, mix for 2h, defoam under -0.1Pa vacuum condition for 30min, and obtain a stable dispersed SiC...

Embodiment 2

[0082] The difference between this embodiment and Embodiment 1 is that the process parameters of each step in this embodiment are different, and the specific settings are as follows:

[0083] (1) SiC / TRISO composite green tape and single SiC green tape were prepared respectively;

[0084] The specific preparation method is: mix SiC short fibers with a length of 2 o 3 and Y 2 o 3. The ball milling medium is absolute ethanol, the mixing balls are dense SiC balls, the ball-to-material ratio is 10:1, the mixing time is 8 hours, and then dried at 60°C to obtain the mixed powder. Mix the obtained mixed powder with 35wt% solvent and 1% tetramethylammonium hydroxide, and ball mill for 8 hours to obtain a stable dispersed suspension; wherein the solvent is a mixed liquid composed of alcohol and toluene, and the volume ratio of alcohol to toluene in the mixed liquid is It is 2:3. Add 5wt% PVB, 4wt% dibutyl phthalate and 1wt% n-butanol to the suspension, mix for 2h, defoam under -0....

Embodiment 3

[0097] The difference between this embodiment and embodiment 1 is that the sintering method in this embodiment is different, and the specific settings are as follows:

[0098] (a) When the sintering method is spark plasma sintering, the sintering process is:

[0099] The FCM green body after debinding is placed in a graphite mold and subjected to spark plasma sintering. The graphite mold size matches the FCM green body size. Sintering temperature: 1700°C, sintering pressure: 20MPa, holding time: 5min, sintering atmosphere: N 2 ; Vacuum degree: <1Pa. The process flow is: heat up to 1000°C at 50°C / min, hold for 1 minute; heat up to 1700°C at 100°C / min, hold for 5 minutes; cool down to 1000°C at 100°C / min, hold for 2 minutes, and then cool to room temperature with the furnace to obtain FCM fuel pellets.

[0100] (b) When the sintering method is pressure sintering, the sintering process is:

[0101] The debinding FCM green body is placed in a graphite mold and subjected to pr...

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Abstract

The invention discloses a method for preparing a plate-shaped full-ceramic-coated fuel pellet by integrated molding, which solves the problems of complex steps in the preparation of the existing FCM fuel, difficulty in engineering application, difficulty in co-firing of the fuel-free area and SiC matrix ceramics, and difficulties in the preparation process. Problems such as uneven distribution of TRISO particles and difficulty in preparing fuel-free regions. The invention includes: (1) preparing SiC / TRISO composite green tape and single SiC green tape respectively; (2) making a green body with an upper structure, a middle structure and a lower structure; wherein, the upper structure and the lower structure are one Single SiC green tape with more than one layer, and the middle layer structure is SiC / TRISO composite green tape with more than one layer; (3) The green body is processed by cold isostatic pressing and debinding to make a semi-finished product; (4) The semi-finished product is made after sintering into a finished product. The invention has the advantages of simple production process, low cost, short production cycle, suitability for industrialized production and the like.

Description

technical field [0001] The invention belongs to the field of ceramic material molding, and in particular relates to a method for preparing a plate-shaped full-ceramic-coated fuel pellet through integrated molding. Background technique [0002] After the Fukushima accident in Japan, reactor safety has become the top priority for nuclear power development. Internationally, Accident Tolerant Fuel (ATF) came into being. In active nuclear reactor fuel assemblies, the cladding tube is the first barrier to block fission products and the only barrier for fission products to enter the circuit. When the cladding is damaged, the fission products will enter the circuit, resulting in reactor circuit pollution. While active ceramic fuels such as UO 2 , UN, U-Si, etc. have weak tolerance to fission products, and at the same time, UN, U-Si, etc. have poor corrosion resistance. After the cladding is damaged, the fission products are easy to enter the reactor loop system. [0003] Most act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/02C04B35/565C04B35/622
CPCY02E30/30
Inventor 刘仕超陈平高士鑫焦拥军李文杰李伟尹春雨周毅唐昌兵陈亮郭子萱蒋有荣
Owner NUCLEAR POWER INSTITUTE OF CHINA
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