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Method for preparing thermal neutron absorption isolation block ceramic material

A ceramic material and spacer technology, applied in the field of material science, can solve the problems of high sintering temperature, difficulty in sintering, poor metal stability, etc., and achieve the effect of high absorption efficiency, low viscosity and good toughness

Inactive Publication Date: 2015-09-23
YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor toughness of boron carbide, high sintering temperature, poor oxidation resistance, poor stability to metals, and it is difficult to sinter densely and other shortcomings, its application is greatly limited. In order to improve the use of boron carbide materials, it is necessary to reduce carbonization. The sintering temperature of boron, and improve its strength and fracture toughness, and improve its oxidation resistance

Method used

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  • Method for preparing thermal neutron absorption isolation block ceramic material
  • Method for preparing thermal neutron absorption isolation block ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Put 800g of boron carbide, 180g of carbon powder, and 20g of boron into deionized water, use deionized water as a solvent, and agate balls as a grinding medium, then add 5g of phenolic resin and 10g of polyacrylic acid to it, and ball mill for 5 hours to obtain a water-based Boron carbide paste;

[0028] (2) Place the slurry obtained in step (1) in a drying oven and dry at a constant temperature of 65°C for 10 hours, pass the dried powder through a 200-mesh sieve, and use a phenolic resin with a mass concentration of 10% for the sieved powder 100g of the solution was manually granulated, and the granulated powder was passed through a 60-mesh sieve to obtain boron carbide composite powder granules;

[0029] (3) dry pressing the composite powder granules obtained in step (2) under 120Mpa to obtain a regular hexagonal R57mm*15mm boron carbide ceramic green body;

[0030] (4) Put the boron carbide ceramic green body obtained in step (3) into a reaction sintering furnac...

Embodiment 2

[0033] (1) Put 850g of boron carbide, 90g of carbon powder, and 10g of boron into deionized water, use deionized water as a solvent, and agate balls as a grinding medium, then add 10g of phenolic resin and 5g of polyacrylic acid to it, and ball mill for 10 hours to obtain a water-based Boron carbide paste;

[0034] (2) Place the slurry obtained in step (1) in a drying oven and dry at a constant temperature of 65°C for 8 hours, pass the dried powder through a 200-mesh sieve, and use a phenolic resin with a mass concentration of 10% for the sieved powder 100g of the solution was manually granulated, and the granulated powder was passed through a 60-mesh sieve to obtain boron carbide composite powder granules;

[0035] (3) dry pressing the composite powder granules obtained in step (2) under 80Mpa to obtain a circular boron carbide ceramic green body with a diameter of Φ120mm*15mm;

[0036] (4) Put the boron carbide ceramic green body obtained in step (3) into a reaction sinteri...

Embodiment 3

[0039] (1) Put 900g of boron carbide, 50g of carbon powder, and 50g of boron into deionized water, use deionized water as a solvent, and agate balls as a grinding medium, then add 15g of phenolic resin and 10g of polyacrylic acid to it, and ball mill for 8 hours to obtain a water-based Boron carbide paste;

[0040] (2) Place the slurry obtained in step (1) in a drying oven and dry at a constant temperature of 65°C for 10 hours, pass the dried powder through a 200-mesh sieve, and use a phenolic resin with a mass concentration of 10% for the sieved powder 100g of the solution was manually granulated, and the granulated powder was passed through a 60-mesh sieve to obtain boron carbide composite powder granules;

[0041](3) dry pressing the composite powder granules obtained in step (2) under 100Mpa to obtain a regular hexagonal R57mm*15mm boron carbide ceramic green body;

[0042] (4) Put the boron carbide ceramic green body obtained in step (3) into a reaction sintering furnace...

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Abstract

The invention relates to a method for preparing a thermal neutron absorption isolation block ceramic material. The method comprises the following steps: (1) putting 80 to 90 parts of boron carbide, 5 to 18 parts of carbon powder and 1 to 5 parts of sintering aid as raw materials in parts by weight in deionized water, wherein agate balls serve as grinding media; then, adding a binder and a dispersing agent to the deionized water, and performing ball-mill mixing; (2) performing constant temperature drying on slurry obtained in the step (1), sieving, manually pelletizing powder by adopting phenolic resin solution, and sieving the pelletized powder; (3) performing dry-pressing molding on composite powder amyloplastid in the step (2) to obtain a boron carbide ceramic biscuit with a specific shape; (4) putting the biscuit in a vacuum reaction sintering furnace for siliconing sintering, and machining and polishing to obtain a sintered boron carbide-based ceramic block. According to the method disclosed by the invention, the boron carbide-based composite ceramic material which is high in compactness, has mechanical properties, and meanwhile, has a high thermal neutron absorption coefficient is obtained by utilizing a reaction sintering technology.

Description

technical field [0001] The invention relates to a preparation method of a ceramic material, in particular to a preparation method of a thermal neutron absorption isolation block ceramic material, which belongs to the field of material science. Background technique [0002] During the storage and transportation of spent high-level radioactive nuclear waste from thermal neutron reactors, thermal neutrons are unavoidably released to the environment. Neutron-absorbing materials can absorb thermal neutrons released from spent nuclear waste and maintain the spent nuclear waste in a subcritical state to ensure the safety of spent nuclear waste. [0003] Boron is an element rich in natural resources. Boron has good thermal neutron absorption capacity due to its high thermal neutron absorption cross section. Its thermal neutron absorption cross section is 752b, and it obeys neutron energy within a wide 1 / V Absorption Law. After boron absorbs neutrons, there will be no large residua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
Inventor 曹剑武燕东明高晓菊满蓬张丛张武方志坚段关文周雅伟李国斌李志鹏王静慧贾书波王志伟白嵘
Owner YANTAI BRANCH NO 52 INST OF CHINA NORTH IND GRP
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