A kind of neutron shielding foam ceramics and preparation method thereof

A foamed ceramic and neutron technology, which is applied in the field of foamed ceramics, can solve the problems of high bulk density, cannot be used under high temperature conditions, large quality and volume, etc., and achieves high strength, excellent chemical resistance and neutron shielding performance. , the effect of small bulk density

Active Publication Date: 2021-02-26
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 35~45 parts of zirconia micropowder with 50~55 parts of alumina micropowder and 3~5 parts of yttrium oxide to obtain mixed powder I, and then add 0.5~2.0 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 milled for 3 to 5 hours to obtain slurry I;

[0035] Step 2. Mix 15-25 parts of gadolinium oxide micropowder, 30-35 parts of Fujian mud, and 28-32 parts 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 to 0.7 parts of carboxyethyl cellulose sodium, 0.1 to 0.7 parts of ethanol and 25 to 52 parts of water were mechanically milled for 1 to 3 hours to obtain slurry II;

[0036] Step 3. Immerse the pretreated polyurethane sponge in t...

Embodiment 2

[0040] A neutron 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.

[0041] 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 0.5-2.0 parts by mass of polyammonium methacrylate, 0.2-1.6 parts by mass of sodium carboxymethylcellulose, 0.1-0.5 parts by mass of ethanol and 20-46 parts by mass of water to the mixed powder I, and mechanically ball mill for 3 ~5h, prepared slurry I;

[0042] Step 2, mix 25 to 35 parts of gadolinium oxide micropowder, 10 to 20 parts of quality Fujian mud, 10 to 15 parts of bentonite, and 24 to 28 parts of quality alumina micropowder 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 ethanol and 25-52 part...

Embodiment 3

[0045] 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.

[0046] 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 1-2 parts of yttrium oxide to obtain mixed powder I, and then Add 0.5-2.0 parts by mass of polyammonium methacrylate, 0.2-1.6 parts by mass of sodium carboxymethylcellulose, 0.1-0.5 parts by mass of ethanol and 20-46 parts by mass of water to the mixed powder I, and mechanically ball mill for 3 ~5h, prepared slurry I;

[0047] Step 2. Mix 35-45 parts of gadolinium oxide micropowder, 20-25 parts of Suzhou soil, and 20-24 parts 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 to 0.7 parts of carboxyethyl cellulose sodium, 0.1 to 0.7 parts of ethanol and 25 to 52 parts of water were mechanical...

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Abstract

The invention relates to a neutron-shielding foam ceramic and a preparation method thereof. First, zirconia micropowder, alumina micropowder, rare earth element oxide, polyammonium methacrylate, sodium carboxymethyl cellulose, ethanol and water are mixed uniformly to prepare Obtain slurry I; mix gadolinium oxide micropowder, clay, alumina micropowder, polycarboxylate, sodium carboxyethyl cellulose, ethanol and water to prepare slurry II; impregnate polyurethane sponge in slurry I, Use compressed air spray or centrifugal slurry, dry, heat preservation, to obtain foam ceramic preform; then use slurry II to vacuum impregnate the foam ceramic preform, compressed air spray or centrifugal slurry, dry; finally under certain conditions Insulation, that is, neutron shielding foam ceramics. The neutron shielding foam ceramic prepared by the invention has small volume density, high strength, excellent chemical corrosion 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 Patents(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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