Boron carbide nuclear neutron absorbing material and preparation method

A technology of absorbing material and boron carbide core, which is applied in the field of advanced ceramics, can solve the problems of limited output of single furnace of hot pressing process and high price of hot pressed boron carbide ceramics, so as to prevent surface diffusion and evaporation, improve neutron absorption efficiency, The effect of increasing the mass transfer rate

Inactive Publication Date: 2019-04-09
YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hot pressing process is to apply a certain pressure to the boron carbide sintered body while sintering at high temperature to promote the densification of boron carbide ceramics. However, the output of a single furnace of the hot pressing process is limited, and only small-sized and relatively simple-shaped structural products can be prepared. , so hot-pressed boron carbide ceramics are very expensive

Method used

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  • Boron carbide nuclear neutron absorbing material and preparation method
  • Boron carbide nuclear neutron absorbing material and preparation method

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Experimental program
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Effect test

Embodiment 1

[0028] 920 grams of boron carbide nuclear grade powder (D 50 ≥7μm), 60 grams of carbon powder, 20 grams of silicon carbide powder, and 1000 grams of deionized water are added to the mixing container of the ball mill, and 130 grams of phenolic resin, 50 grams of polyvinyl alcohol and 30 grams of dispersant (ammonium polyacrylate) are added for ball milling pulp. Control the mixing time of the ball mill, the speed of the ball mill, and the ball-to-material ratio to prepare a slurry suitable for spray drying and granulation. Specifically: polyurethane balls are used as the medium balls during ball milling. The diameter of the balls is 10mm. The ball-to-material ratio is the weight of the medium balls The ratio of boron carbide, carbon powder and silicon carbide powder to the sum of the three raw materials is 3:1, the mixing time of the ball mill is 12 hours, and the speed of the ball mill is 80 rpm. Then, the granulated powder is obtained through spray granulation, specifically:...

Embodiment 2

[0031] 910 grams of boron carbide nuclear grade powder (D 98 ≥41 μm), 40 grams of carbon powder, 50 grams of yttrium oxide powder, 1000 grams of deionized water, add to the mixing container of the ball mill, add 50 grams of phenolic resin, 50 grams of polyvinyl butyral and 20 grams of dispersant (ammonium citrate ) to carry out ball milling pulping (ball milling pulping process is as embodiment 1). Then, the granulated powder is obtained through spray granulation, specifically: after the slurry is passed through a 100-mesh sieve, the slurry is sent to the centrifugal turntable nozzle of the spray drying granulator with a peristaltic pump, and the rotating speed of the centrifugal turntable is 6000 rpm , form tiny mist droplets, the inlet temperature of the spray drying granulator is 160°C, and the outlet temperature is 110°C. The obtained granulated powder was dry-pressed under a pressure of 150 MPa to obtain a green body; the green body was put into a vacuum sintering furnac...

Embodiment 3

[0034] 930 grams of boron carbide nuclear grade powder (D 50 ≥23μm), 60 grams of carbon powder, 10 grams of zirconia powder, and 1500 grams of deionized water are added to the mixing container of the ball mill, and 60 grams of polyvinylpyrrolidone, 40 grams of polyethylene oxide and 20 grams of dispersant (ammonium polyacrylate) are added. Ball milling (ball milling process is as in Example 1). Then, the granulated powder is obtained through spray granulation, specifically: after the slurry is passed through a 60-mesh sieve, the slurry is sent to the centrifugal turntable nozzle of the spray drying granulator with a peristaltic pump, and the rotating speed of the centrifugal turntable is 6000 rpm , form tiny mist droplets, the inlet temperature of the spray drying granulator is 150°C, and the outlet temperature is 110°C. The obtained granulated powder was dry-pressed under a pressure of 150 MPa to obtain a green body; the green body was put into a vacuum sintering furnace for...

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Abstract

The invention relates to a boron carbide nuclear neutron absorbing material and a preparation method. The preparation method comprises the following steps: putting the three raw materials including 85percent by weight to 98.5 percent by weight of boron carbide powder (nuclear-grade powder), 1 percent by weight to 5 percent by weight of solid phase sintering additives and 0.5 percent by weight to10 percent by weight of liquid phase sintering additives into a ball mill mixing container; adding a polymer material as a soft template and adding deionized water to perform balling milling and pulping to obtain the slurry, wherein the solid phase content of the slurry is 40 percent by weight to 70 percent by weight; processing the slurry by using a spray drying granulating machine to obtain granulating powder; pressing the granulating powder by adopting the processes of dry pressing molding or cold isostatic pressing molding under the pressure of 50MPa to 300MPa to form green bodies; and putting the green bodies into a vacuum furnace, keeping a temperature for 0.5 hour to 5 hours under the temperature of 2000 DEG C to 2300 DEG C by adopting a vacuum or constant-pressure sintering way soas to complete sintering to obtain boron carbide ceramics. The boron carbide nuclear neutron absorbing material and the preparation method disclosed by the invention have the advantages that by usingthe boron carbide nuclear-grade powder as a raw material and the polymer material as the soft template, the boron carbide nuclear neutron absorbing material is prepared; the boron carbide nuclear neutron absorbing material has the advantages of low cost, batch production, low free carbon content and high neuron absorption efficiency, is suitable for preparing large-sized protection parts with complicated shapes, and has good application prospect in small nuclear reactor outer-layer protection and other types of nuclear reactor protection.

Description

Technical field: [0001] The invention relates to a technical method of a boron carbide nuclear neutron absorbing material with integrated structure and function, which belongs to the field of advanced ceramics. technical background: [0002] Boron carbide ceramics have a good ability to absorb neutrons, which is due to the isotope in natural boron 10 The thermal neutron capture cross section of B reaches 3850 / b. Therefore, in the nuclear industry, boron carbide ceramics are very important neutron absorbing materials. With the rapid development of the nuclear power industry, products such as boron carbide neutron absorbing balls, control rods, nuclear waste storage and laboratory boron carbide-based shielding plates have been widely used in various types of nuclear reaction systems. At the beginning of this century, the United States proposed the fourth-generation advanced nuclear energy reactor system, with development goals including sustainability, safety, reliability, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/64C04B38/06
CPCC04B35/563C04B35/622C04B35/64C04B38/067C04B2235/3225C04B2235/3244C04B2235/3826C04B2235/422C04B2235/5436C04B2235/656C04B2235/6567C04B2235/668C04B2235/77C04B38/0067
Inventor 李志鹏高晓菊张涛方世杰林广庆曹剑武燕东明周雅伟牟晓明王志强贾书波吴宇超
Owner YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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