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Interpenetrating mullite/boron carbide foamed ceramic high-temperature-resistant neutron shielding material and preparation method thereof

A technology of foam ceramics and shielding materials, which is applied in the field of interpenetrating mullite/boron carbide foam ceramic high-temperature-resistant neutron shielding materials and its preparation, can solve the problems of large grain boundary movement resistance, difficult preparation, and high process cost. It achieves the effects of excellent corrosion resistance and radiation resistance, good radiation resistance and ductility, and high chemical stability

Pending Publication Date: 2022-02-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of neutron protection, the most widely used ceramic material for ceramic matrix composites is boron carbide ceramics; boron carbide ceramics are generally hard, but because the melting point of boron carbide is as high as 2350 ° C, the plasticity is poor, and the grain boundary movement resistance is very large, so pure carbonization The sintering conditions of boron ceramics are harsh, the preparation is difficult, and the process cost is extremely high
In order to prepare composite materials in which ceramics and polymers are combined into interpenetrating phases, boron carbide ceramics are selected to be prepared as porous foams, which leads to the inability to use hot-pressing sintering during calcination, which further leads to difficulties in sintering boron carbide ceramics

Method used

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  • Interpenetrating mullite/boron carbide foamed ceramic high-temperature-resistant neutron shielding material and preparation method thereof
  • Interpenetrating mullite/boron carbide foamed ceramic high-temperature-resistant neutron shielding material and preparation method thereof
  • Interpenetrating mullite/boron carbide foamed ceramic high-temperature-resistant neutron shielding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An interpenetrating mullite / boron carbide foam ceramic high temperature resistant neutron shielding material, the production steps are as follows:

[0036] Step 1. Ingredients: (set as powder ratio A) mix 30 parts by mass of boron carbide micropowder, 55 parts by mass of alumina micropowder, 10 parts by mass of superfine kaolin, and 5 parts by mass of titanium dioxide micropowder as a sintering aid, Obtain 100 parts of quality mixed powder I; then add 0.5 parts of quality polycarboxylate, 0.7 parts of quality of sodium carboxymethyl cellulose, 0.7 parts of quality of polyvinyl alcohol and 1.0 parts of quality to 61.3 parts of quality of deionized water of absolute ethanol to obtain mixed solution II;

[0037] Step 2. Mixing and impregnating: Weigh the grinding balls in a certain proportion by weight, the ball-to-material ratio = 1:1; add the mixed powder Ⅰ, mixed solution Ⅱ and grinding balls into the ball milling tank one by one, and mechanically mill for 3 hours to prep...

Embodiment 2

[0042] An interpenetrating mullite / boron carbide foam ceramic high-temperature-resistant neutron shielding material, the production steps described in this example are the same as in Example 1, the difference is that the composition ratio of the micropowder is changed to 25 parts by mass of carbonized Boron micropowder, 55 parts by mass of alumina micropowder, 15 parts by mass of superfine kaolin, and 5 parts by mass of titanium dioxide micropowder as a sintering aid——set as powder ratio B.

[0043] The remaining steps and parameters are consistent with those in Embodiment 1, and will not be described again.

[0044] The novel neutron shielding material prepared in Example 2 has been tested: the volume density of the boron carbide ceramic skeleton is 0.67g / cm 3 , the bulk density of the new neutron shielding material is 1.30g / cm 3 ; The normal temperature compressive strength of the boron carbide ceramic skeleton is 1.31 MPa, and the normal temperature compressive strength of...

Embodiment 3

[0046] An interpenetrating mullite / boron carbide foam ceramic high-temperature-resistant neutron shielding material, the production steps described in this example are the same as in Example 1, the difference is that the composition ratio of the micropowder is changed to 20 parts by mass of carbonized Boron micropowder, 55 parts by mass of alumina micropowder, 20 parts by mass of superfine kaolin, and 5 parts by mass of titanium dioxide micropowder as a sintering aid——set as powder ratio C.

[0047] The remaining steps and parameters are consistent with those in Embodiment 1, and will not be described again.

[0048] The novel neutron shielding material prepared in Example 3 has been tested: the volume density of the boron carbide ceramic skeleton is 0.66g / cm 3 , the bulk density of the new neutron shielding material is 1.18g / cm 3 ; The room temperature compressive strength of the boron carbide ceramic skeleton is 1.04 MPa, and the room temperature compressive strength of the...

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Abstract

The invention discloses an interpenetrating mullite / boron carbide foamed ceramic high-temperature-resistant neutron shielding material and a preparation method thereof, and belongs to the technical field of preparation of foamed ceramic materials and polymer composite materials. The method comprises the following steps: preparing a precursor of the boron carbide foamed ceramic by adopting an organic foam impregnation method; a mullite structure is adopted to reinforce the boron carbide foamed ceramic; calcining the boron carbide foamed ceramic in a pressureless sintering mode under argon protection; filling pores of the foamed ceramic with liquid resin in a vacuum impregnation manner; and curing the liquid resin in the pores in situ in a thermocuring mode to finally form the novel neutron shielding material with the interpenetrating phase. The neutron shielding material prepared by the invention has the advantages of light weight, high temperature resistance, irradiation resistance, chemical corrosion resistance, high mechanical strength and good neutron shielding performance; meanwhile, on the premise of keeping the ceramic material as a high-temperature structural material, the ceramic material also has excellent characteristics of a polymer material.

Description

technical field [0001] The invention belongs to the technical field of preparation of foam ceramic materials and polymer composite materials, and in particular relates to an interpenetrating mullite / boron carbide foam ceramic high-temperature-resistant neutron shielding material and a preparation method thereof. Background technique [0002] With the rapid development of national defense scientific research, radiation medicine and nuclear power industry, the performance requirements of radiation shielding materials are getting higher and higher. Because neutrons are uncharged and have strong penetrability, they will directly interact with the atomic nuclei in the material, and compared with α, β and γ rays of the same energy, they will cause greater damage to the human body, so the developed excellent Neutron shielding materials are particularly important. Over the years, my country has accumulated certain technology and experience in neutron radiation protection materials....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/64C04B35/622C04B35/10C04B41/87G21F1/02G21F1/06G21F1/10
CPCC04B38/067C04B35/10C04B35/622C04B35/64C04B41/009C04B41/5058C04B41/87G21F1/06G21F1/02G21F1/10C04B2235/3232C04B2235/349C04B2235/3821C04B2235/602C04B2235/606C04B2235/656C04B2235/6567C04B2235/658C04B41/4535C04B41/4823C04B41/0072
Inventor 戴耀东刘云福常树全姚初清刘峰蒋丹枫
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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