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Boron-based material modified rare earth oxide space n-γ mixed field radiation shielding composite coating and preparation method thereof

A technology of rare earth oxides and composite coatings, which is applied in coatings, climate sustainability, and greenhouse gas reduction. It can solve problems such as poor wettability, easy aggregation of nanoparticles, and poor neutron radiation shielding performance, and achieve enhanced strength. , enhance wettability and dispersion uniformity, shield and reduce the effect of secondary particles

Active Publication Date: 2022-07-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem that the existing rare earth metal oxide nanoparticles will produce secondary radiation when they are irradiated, and the rare earth metal oxide nanoparticles are easy to agglomerate, have poor wettability in resin, and have poor strength when forming a composite coating material with a resin substrate. To solve the problems of poor radiation shielding performance, a composite coating for radiation shielding of rare earth oxide space n-γ mixed field modified by boron-based materials and its preparation method are provided

Method used

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  • Boron-based material modified rare earth oxide space n-γ mixed field radiation shielding composite coating and preparation method thereof
  • Boron-based material modified rare earth oxide space n-γ mixed field radiation shielding composite coating and preparation method thereof
  • Boron-based material modified rare earth oxide space n-γ mixed field radiation shielding composite coating and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (A) The nano-gadolinium oxide powder was ultrasonically cleaned with absolute ethanol and dried.

[0030] (B) placing the nanometer gadolinium oxide powder treated in step A in a tube furnace, evacuating the tube furnace to a vacuum and heating to 650°C, then opening 2 quartz vent pipes, one of which is fed with mixed gas BCl 3 , N 2 and H 2 , the other way into NH 3 . The flow rate of the incoming gas is QBCl 3 20v / ml·min -1 , QNH 3 60v / ml·min -1 , QN 2 100v / ml·min -1 , QH 2 =20v / ml·min -1 ;

[0031] The system pressure was maintained at 4.5Kpa, the residence time of the reaction gas was 0.25S, and the deposition time was 70min.

[0032] (C) The modified powder material is mixed with epoxy resin, wherein the mass fraction of powder is 50%, and the mass fraction of epoxy resin is 50%. Pour the mixed powder and resin into a Sankun grinder, grind and stir for 10 minutes. The uniformly stirred slurry is coated on the polyimide film by means of blade coating. ...

Embodiment 2

[0038] (A) The nano-gadolinium oxide powder was ultrasonically cleaned with absolute ethanol and dried.

[0039] (B) placing the nano-gadolinium oxide powder treated in step A in a tube furnace, evacuating the tube furnace and heating to 700° C., then opening two quartz breather tubes, one of which is fed with mixed gas BCl 3 , N 2 and H 2 , the other way into NH 3 . The flow rate of the incoming gas is QBX 3 15v / ml·min -1 , QNH 3 65v / ml·min -1 , QN 2 105v / ml·min -1 , QH 2 15v / ml·min -1 ;

[0040] The system pressure was maintained at 3.5Kpa, the reaction gas residence time was 0.2S, and the deposition time was 90min.

[0041](C) The modified powder material is mixed with epoxy resin, wherein the mass fraction of powder is 50%, and the mass fraction of epoxy resin is 50%. Pour the mixed powder and resin into a Sankun grinder, grind and stir for 10 minutes. The uniformly stirred slurry is coated on the polyimide film by means of blade coating. The film material c...

Embodiment 3

[0047] (A) The nano-erbium oxide powder was ultrasonically cleaned with absolute ethanol and then dried.

[0048] (B) placing the nano-gadolinium oxide powder treated in step A in a tube furnace, evacuating the tube furnace and heating to 650°C, then opening 2 quartz vent pipes, one of which is fed with mixed gas BCl 3 , N 2 , H 2 , the other way into NH 3 . The flow rate of the incoming gas is QBCl 3 20v / ml·min -1 , QNH 3 60v / ml·min -1 , QN 2 100v / ml·min -1 , QH 2 20v / ml·min -1 ;

[0049] The system pressure was maintained at 3.0Kpa, the residence time of the reaction gas was 0.35S, and the deposition time was 110min.

[0050] (C) The modified powder material is mixed with epoxy resin, wherein the mass fraction of powder is 50%, and the mass fraction of epoxy resin is 50%. Pour the mixed powder and resin into a Sankun grinder, grind and stir for 10 minutes. The uniformly stirred slurry is coated on the polyimide film by means of blade coating. The film material...

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Abstract

The invention discloses a boron-based material modified rare earth oxide space n-γ mixed field radiation shielding composite coating and a preparation method thereof, belonging to the technical field of functional material preparation. The invention solves the problem that the existing rare earth metal oxide will generate secondary radiation when it is irradiated, and the rare earth metal oxide nanoparticles are easy to agglomerate, have poor wettability in resin, and have poor strength when forming a composite coating material with a resin substrate, which is not suitable for neutron radiation. Poor shielding performance, etc. In the present invention, a dense and controllable thickness BN or BC film layer is deposited on the outer surface of rare earth oxide nanoparticles by chemical vapor deposition method to form a core-shell structure powder, which is then compounded with a resin matrix to prepare a radiation protection coating Floor. The core-shell structure prepared by the invention greatly enhances the wettability and dispersion uniformity of the rare earth oxide nanoparticles in the resin matrix, enhances the strength of the resin matrix, effectively shields gamma rays and neutrons, and reduces the secondary radiation.

Description

technical field [0001] The invention relates to a boron-based material modified rare earth oxide space n-γ mixed field radiation shielding composite coating and a preparation method thereof, belonging to the technical field of functional material preparation. Background technique [0002] The traditional radiation shielding material lead is toxic and seriously pollutes the environment. It has a "weak absorption zone" for X-rays, and has poor neutron shielding performance and high quality. Rare earth oxide nanoparticles have excellent x / γ ray shielding ability. In addition, rare earth elements have special extranuclear electronic structure and special K absorption edge, which just makes up for the "weak absorption region" of lead. Moreover, it has large n and γ reaction cross sections for thermal neutrons, and also has good shielding properties for slow neutrons and fast neutrons. And rare earth elements have high atomic numbers, high density of electrons outside the nucleus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/62
CPCC09D7/62C08K9/10C08K2003/221C08K2201/005Y02E30/30
Inventor 吴晓宏李杨秦伟卢松涛洪杨
Owner HARBIN INST OF TECH