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Neutron shielding foamed ceramic and method for preparing same

A technology of foam ceramics and neutrons, which is applied in the field of foam ceramics, can solve the problems of being unable to use under high temperature conditions, low mechanical properties, and high volume density, and achieve excellent chemical corrosion resistance and neutron shielding performance, and improve mechanical properties. performance and erosion resistance, the effect of small bulk density

Active Publication Date: 2018-08-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main radiation shielding materials mainly have the following problems: large mass and volume, low mechanical strength and poor resistance to acid and alkali erosion
But its main defects are: (1) low mechanical properties; (2) can not be used under high temperature conditions; (3) weak corrosion resistance; (4) high volume density
But its main defects are: (1) weak high temperature stability; (2) low mechanical strength; (3) weak corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A neutron-shielding foam ceramic and a preparation method thereof, the steps of the preparation method are:

[0034] Step 1. Mix 35 to 45 parts by mass of zirconia micropowder and 50 to 55 parts by mass of alumina micropowder, plus 3 to 5 parts by mass of yttrium oxide to obtain mixed powder I, and then add 0.5 to 2.0 1 part by mass of ammonium polymethacrylate, 0.2 to 1.6 parts by mass of sodium carboxymethylcellulose, 0.1 to 0.5 parts by mass of ethanol and 20 to 46 parts by mass of water, and mechanically ball milled for 3 to 5 hours to prepare slurry I;

[0035] Step 2. Mix 15-25 parts by mass of gadolinium oxide micropowder, 30-35 parts by mass of Fujian mud, and 28-32 parts by mass of alumina micropowder to obtain mixed powder II; then add 0.2-1.7 parts to mixed powder II A mass of polycarboxylate, 0.1-0.7 mass of carboxyethyl cellulose sodium, 0.1-0.7 mass of ethanol and 25-52 mass of water, mechanical ball milling for 1-3 hours, to prepare slurry II;

[0036] S...

Embodiment 2

[0040] A neutron foam ceramic and a preparation method thereof. The preparation method shown in this embodiment is except step 1 and step 2, and all the other are the same

[0041] Example 1.

[0042] Step 1. Mix 35-45 parts of zirconia micropowder with 50-55 parts of alumina micro-powder, plus 1-2 parts of strontium oxide and 2-3 parts of samarium oxide to obtain mixed powder I, and then Add 0.5 to 2.0 parts by mass of ammonium polymethacrylate, 0.2 to 1.6 parts by mass of sodium carboxymethylcellulose, 0.1 to 0.5 parts by mass of ethanol and 20 to 46 parts by mass of water to the mixed powder I, and mechanically ball mill for 3 ~5h, the slurry I was prepared;

[0043] Step 2. Mix 25-35 parts of gadolinium oxide micropowder, 10-20 parts of Fujian mud, 10-15 parts of bentonite, and 24-28 parts of alumina micro-powder to obtain mixed powder II; Add 0.2-1.7 parts by mass of polycarboxylate, 0.1-0.7 parts by mass of carboxyethyl cellulose sodium, 0.1-0.7 parts by mass of ethan...

Embodiment 3

[0046] A neutron shielding foam ceramic and a preparation method thereof. The preparation method shown in this embodiment is the same as that in Example 1 except step 1 and step 2.

[0047] Step 1. Mix 35-45 parts of zirconia micropowder with 50-55 parts of alumina micropowder, plus 1-2 parts of strontium oxide and 1-2 parts of yttrium oxide to obtain mixed powder I, and then Add 0.5 to 2.0 parts by mass of ammonium polymethacrylate, 0.2 to 1.6 parts by mass of sodium carboxymethylcellulose, 0.1 to 0.5 parts by mass of ethanol and 20 to 46 parts by mass of water to the mixed powder I, and mechanically ball mill for 3 ~5h, the slurry I was prepared;

[0048] Step 2. Mix 35-45 parts by mass of gadolinium oxide micropowder, 20-25 parts by mass of Suzhou soil, and 20-24 parts by mass of alumina micropowder to obtain mixed powder II; then add 0.2-1.7 parts to mixed powder II A mass of polycarboxylate, 0.1-0.7 mass of carboxyethyl cellulose sodium, 0.1-0.7 mass of ethanol and 25-5...

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Abstract

The invention relates to neutron shielding foamed ceramic and a method for preparing the same. The method includes uniformly mixing zirconium oxide micro-powder, aluminum oxide micro-powder, rare earth element oxide, ammonium polymethylacrylate, sodium carboxymethyl celluloses, ethyl alcohol and water with one another to obtain slurry I; uniformly mixing gadolinium oxide micro-powder, clay, aluminum oxide micro-powder, polycarboxylate, sodium carboxyethyl celluloses, ethyl alcohol and water with one another to obtain slurry II; impregnating polyurethane sponges in the slurry I, carrying out injection by the aid of compressed air or centrifugal slurry spinning, and carrying out drying and heat insulation to obtain foamed ceramic prefabricated bodies; carrying out vacuum impregnation on thefoamed ceramic prefabricated bodies by the aid of the slurry II, carrying out injection by the aid of compressed air or centrifugal slurry spinning and carrying out drying; ultimately carrying out heat insulation under certain conditions to obtain the neutron shielding foamed ceramic. The neutron shielding foamed ceramic and the method have the advantages that the neutron shielding foamed ceramicprepared by the aid of the method is small in volume density, high in strength and excellent in chemical erosion resistance and neutron shielding performance.

Description

technical field [0001] The invention relates to the technical field of foam ceramics, in particular to a neutron shielding foam ceramic and a preparation method thereof. Background technique [0002] After entering the 21st century, with the rapid development of nuclear industry technology, neutron and neutron source technology are widely used in energy, military, medical and agricultural industries. While benefiting people's lives, it also brings extremely destructive harm. Neutrons can cause harm to the human body through ionization and excitation due to their strong penetrating properties. At present, the main radiation shielding materials mainly have the following problems: large mass and volume, low mechanical strength, and poor resistance to acid and alkali erosion. Therefore, the preparation of high-performance radiation protection materials has become an urgent problem to be solved today. [0003] Foam ceramics are widely used in the preparation of high-performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/64C04B38/06G21F1/06
CPCC04B35/10C04B35/64C04B38/0615C04B2235/3224C04B2235/3225C04B2235/3244C04B2235/349C04B2235/5436C04B2235/5445C04B2235/6562C04B2235/661C04B2235/77C04B2235/96C04B2235/9669G21F1/06C04B38/0067
Inventor 贾文宝陈若愚金利民汪瑜凡黑大千
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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