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sic f /sic nuclear cladding tube port cao-mgo-al 2 o 3 -sio 2 Glass encapsulation method

A glass encapsulation and cladding tube technology, which is applied in nuclear power generation, greenhouse gas reduction, fuel elements, etc., can solve the problem of high connection temperature, difficulty in meeting the packaging requirements of SiC nuclear cladding tubes, and inability to meet cladding tube airtightness requirements and other problems, to achieve the effect of preventing interface cracking, reducing internal residual stress, and reducing the decay rate of nuclear radiation

Active Publication Date: 2021-10-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods can meet the structural requirements of the connection, but the former two have obvious cracks at the connection interface after irradiation, which cannot meet the airtightness requirements of the cladding tube, and the connection temperature of the latter is as high as 1800 ° C, which is far higher than that of the third-generation SiC fiber made in China. Applicable range (≤1450℃)
As of now, the commonly used packaging / connecting agents and their use conditions are still difficult to meet SiC f / Packaging requirements for SiC core cladding tubes

Method used

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  • sic <sub>f</sub> /sic nuclear cladding tube port cao-mgo-al <sub>2</sub> o <sub>3</sub> -sio <sub>2</sub> Glass encapsulation method
  • sic <sub>f</sub> /sic nuclear cladding tube port cao-mgo-al <sub>2</sub> o <sub>3</sub> -sio <sub>2</sub> Glass encapsulation method
  • sic <sub>f</sub> /sic nuclear cladding tube port cao-mgo-al <sub>2</sub> o <sub>3</sub> -sio <sub>2</sub> Glass encapsulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] CaO, MgO, Al with scale ~1μm 2 o 3 , SiO 2 The mass ratio of four kinds of powders is: 10.5wt.% CaO, 10.5wt.% MgO, 15wt.% Al 2 o 3 ,64wt.%SiO 2 , the four powders were mixed with alcohol and ball milled for 12 hours. After mixing, the slurry was dried to make a mixed powder. The prepared mixed powder was placed in an alumina crucible, held in an air atmosphere at 1600°C for 2 hours, then taken out and quenched in cold water to form a transparent glass block. The glass block was milled for 10 h in a ball mill and passed through a 150-mesh sieve to prepare glass powder. The prepared glass powder is mixed with alcohol to form an encapsulant, wherein the mass fraction of alcohol added is 70%. Apply the prepared encapsulant evenly on the processed SiC f / SiC plug on the surface to be encapsulated, and with SiC f The / SiC core cladding tube is assembled and placed in a vacuum furnace for heat treatment. The heat treatment atmosphere is vacuum, the heat treatment tempe...

Embodiment 2

[0036] CaO, MgO, Al with scale ~1μm 2 o 3 , SiO 2 The mass ratio of four kinds of powders is: 11wt.% CaO, 9wt.% MgO, 20wt.% Al 2 o 3 ,60wt.%SiO 2, the four powders were mixed with alcohol and ball milled for 12 hours, and the slurry was dried after mixing to make a mixed powder. The prepared mixed powder was placed in an alumina crucible, held in an air atmosphere at 1600°C for 2 hours, then taken out and quenched in cold water to form a transparent glass block. The glass block was milled for 10 h in a ball mill and passed through a 150-mesh sieve to prepare glass powder. The prepared glass powder is mixed with alcohol to form an encapsulant, wherein the mass fraction of alcohol added is 70%. Apply the prepared encapsulant evenly on the processed SiC f / SiC plug to be encapsulated surface, and with SiC f The / SiC core cladding tube is assembled and placed in a vacuum furnace for heat treatment. The heat treatment atmosphere is vacuum, the heat treatment temperature is...

Embodiment 3

[0038] CaO, MgO, Al with scale ~1μm 2 o 3 , SiO 2 The mass ratio of four kinds of powders is: 11wt.% CaO, 9wt.% MgO, 20wt.% Al 2 o 3 ,60wt.%SiO 2 , the four powders were mixed with alcohol and ball milled for 10 hours, and the slurry was dried after mixing to make a mixed powder. The prepared mixed powder was placed in an alumina crucible, held in an air atmosphere at 1650°C for 2 hours, then taken out and quenched in cold water to form a transparent glass block. The glass block was milled for 10 h in a ball mill and passed through a 150-mesh sieve to prepare glass powder. The prepared glass powder is mixed with alcohol to form an encapsulant, wherein the mass fraction of alcohol added is 90%. Apply the prepared encapsulant evenly on the processed SiC f / SiC plug to be encapsulated surface, and with SiC f The / SiC core cladding tube is assembled and placed in a vacuum furnace for heat treatment. The heat treatment atmosphere is vacuum, the heat treatment temperature i...

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Abstract

The present invention relates to a SiC f / SiC core cladding tube ports CaO‑MgO‑Al 2 o 3 ‑SiO2 2 The glass encapsulation method selects some raw materials with low reactivity, small nuclear radiation decay rate, and no side effects on the nuclear reaction process, and prepares them into glass solder by melting-water cooling method, relying on the fluidity of the glass itself and the SiC f Wetting of / SiC composite materials, realize SiC under the applicable temperature of domestic third-generation SiC fibers (≤1450°C) and under pressure-free conditions f / Encapsulation / joining of SiC composite core cladding tubes. Beneficial effects: the encapsulation / connecting agent raw material is selected from low-activity elements, its nuclear radiation decay rate is small, and it has no side effects on the nuclear reaction process, and can meet the harsh nuclear environment. CMAS glass is selected as the packaging / connecting agent, whose thermal expansion coefficient matches that of SiC / SiC, which can effectively prevent interface cracking caused by thermal mismatch and reduce internal residual stress. In addition, its packaging / connection conditions meet domestic SiC f / SiC composite material requirements.

Description

technical field [0001] The invention belongs to the preparation technology of glass packaging, and relates to a SiC f / Encapsulation and connection technology of SiC core cladding tube port, specifically related to SiC f / SiC core cladding tube port CaO-MgO-Al 2 o 3 -SiO 2 A glass encapsulation method, which is mainly used in the encapsulation and connection of cladding pipe joints. Background technique [0002] The main cause of the Fukushima nuclear accident in Japan: the failure of the reactor cooling system caused the core temperature to rise rapidly; the zirconium cladding tube gradually lost its mechanical properties and was damaged above 600°C, causing the core to be exposed, collapsed and melted; at 1000°C, The zirconium-water violent reaction releases a large amount of hydrogen gas, which causes an explosion and a nuclear leak. [0003] After the Fukushima accident, the research and development has radiation resistance, high temperature resistance, good chemica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B37/00C03C8/24G21C3/10
CPCC03C8/24C04B37/003C04B2237/10G21C3/10Y02E30/30
Inventor 范尚武马旭姬彪张立同成来飞李晓强
Owner NORTHWESTERN POLYTECHNICAL UNIV
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