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A preparation method of boron carbide porous ceramics for high temperature gas-cooled reactor nuclear control rods

A technology of high-temperature gas-cooled reactors and porous ceramics, applied in the field of nuclear reactors, can solve the problems of short reactor shutdown and replacement period, easy damage during processing and use, and short service life, and achieve suitable large-scale production, low process cost, and high The effect of specific surface area

Active Publication Date: 2021-11-19
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to facilitate the timely diffusion of the generated helium, the porous structure must be maintained, so the degree of sintering of the ceramic is very low, so the ceramic strength is poor (compressive strength 100-200MPa), and the toughness is poor (fracture toughness 2.5-3MPa.m 1 / 2 ), are easily damaged during processing and use, have poor reliability, and have a short service life, resulting in a short reactor shutdown and replacement cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Weigh effective components and various process additives according to the following weight ratio, component weight ratio: ultrafine boron carbide micropowder 86wt%, boron carbide whisker 7wt%, boron nitride micropowder 1wt%, high activity Carbon powder 4wt%, PVA adhesive 1wt% (10% aqueous solution), water-soluble phenolic resin adhesive 0.5wt%, oleic acid 0.5wt%, deionized water amount. Add the phenolic resin and deionized water to the mixing equipment, and mix for 2 hours. Add boron carbide whiskers and boron nitride fine powder into the phenolic resin solution, and continue mixing for 3 hours to form a semi-dry material. Put the semi-dry material into an oven, bake at 80°C for 3 hours, and disperse to obtain a dry mixture. Put the dried mixture into a vacuum furnace and keep it warm at 900°C for 1 hour. The thermal decomposition of the phenolic resin is completed, and the boron nitride micropowder is firmly coated on the surface of the boron carbide whi...

Embodiment 2

[0029]Embodiment 2: Weigh effective components and various process additives according to the following weight ratio, component weight ratio: ultrafine boron carbide micropowder 76wt%, boron carbide whisker 18wt%, boron nitride micropowder 2wt%, high activity Toner 2wt%. In addition, PVA adhesive 1.5wt% (10% aqueous solution), oleic acid 0.5wt%, deionized water amount. Add 0.3wt% PVA solution and appropriate amount of deionized water to the mixing equipment, and mix for 1 hour. Add boron carbide whiskers and boron nitride micropowder into the PVA solution, and continue mixing for 2 hours to form a semi-dry material. Put the semi-dry material into an oven, bake it at 110°C for 2 hours, and disperse it to obtain a dry mixture. Put the dried mixture into a vacuum furnace, keep it warm at 700°C for 3 hours, the PVA is thermally decomposed, and the boron nitride micropowder is firmly coated on the surface of the boron carbide whiskers to obtain the coated boron carbide whiskers. ...

Embodiment 3

[0030] Embodiment 3: Weigh effective components and various process additives according to the following weight ratio, component weight ratio: ultrafine boron carbide micropowder 84wt%, boron carbide whisker 10wt%, boron nitride micropowder 1wt%, high activity 2wt% carbon powder, 2wt% PVA adhesive (10% concentration aqueous solution), 0.6wt% phenolic resin, 0.4wt% oleic acid, appropriate amount of deionized water. Add the phenolic resin and deionized water to the mixing equipment, and mix for 2 hours. Add boron carbide whiskers and boron nitride fine powder into the phenolic resin solution, and continue mixing for 3 hours to form a semi-dry material. Put the semi-dry material into an oven, bake at 80°C for 3 hours, and disperse to obtain a dry mixture. Put the dried mixture into a vacuum furnace and keep it warm at 900°C for 1 hour. The thermal decomposition of the phenolic resin is completed, and the boron nitride micropowder is firmly coated on the surface of the boron carb...

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PUM

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Abstract

The invention discloses a method for preparing boron carbide porous ceramics for high-temperature gas-cooled reactor nuclear control rods. Micropowder, 5-20wt% boron carbide whiskers with a diameter of 1-20 microns, 0.1-2.0wt% boron nitride micropowder with a median particle size of 0.1-3.0 microns, 1-5wt% highly active carbon with a median particle size of <3 μm Powder, water-soluble adhesive 0.1-3wt%, release agent 0-1.0wt%, appropriate amount of deionized water; the sum of the above components is 100%, through pulping, granulation, sintering, machining and other processes, The boron carbide porous ceramics for nuclear control rods of high-temperature gas-cooled reactors can be obtained by greatly improving the strength, improving the reliability of high-temperature gas-cooled reactor nuclear control rods, prolonging the service life of control rods, improving the safety factor of nuclear reactors, and prolonging the shutdown period of reactors. .

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a method for preparing boron carbide porous ceramics for high-temperature gas-cooled reactor nuclear control rods. Background technique [0002] As a clean, safe and environmentally friendly energy source, nuclear power generation is of great significance to alleviating the energy security of countries around the world and global climate change. Developing safer and more economical nuclear power generation technology is the goal of nuclear power development in the world. With the completion of the demonstration project of the Shidao Bay Nuclear Power Plant, the world's first nuclear power plant with the safety characteristics of the fourth-generation nuclear energy system has officially entered commercial use, marking that my country is already at the leading level in the world in the research and application of high-temperature gas-cooled reactors. [0003] The operati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/81C04B35/622C04B35/628C04B35/64C04B38/00G21C7/06
CPCY02E30/30
Inventor 邬国平焦永峰谢方民于明亮戚明杰肖清熊礼俊
Owner NINGBO VULCAN TECH CO LTD