CN108863442A - A kind of neutron shield composite material and preparation method - Google Patents
A kind of neutron shield composite material and preparation method Download PDFInfo
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Abstract
The invention discloses a kind of neutron shield composite material and preparation methods, belong to Shielding Materials for Nuclear Radiation field, this method simple process, high yield rate, the foamed ceramics base neutron shield composite material neutron shield of preparation is had excellent performance, bulk density is small, corrosion resistance is strong.The present invention prepares the ceramics of the reticulated foam with certain mechanical properties by polyurethane precursor process, pre-processes later to foam ceramic material；Neutron slowing-down material, 10 ~ 40 mass parts neutron absorber materials and 0 ~ 10 mass parts additive of uniform 60 ~ 90 mass point will be melted after mixing, it is put into pretreated foam ceramic material, higher than slowing material melting temperature negative pressure impregnation, macromolecule slowing material filling a part of melting can be made to enter inside the hollow hole muscle left after polyurethane burning is lost, while filled and process ceramics gap；Extra spilling body portion high molecular material is removed after cooling prepares new neutron shielding foamed ceramics composite material.
Description
Technical field
The invention belongs to Shielding Materials for Nuclear Radiation fields, and in particular to a kind of neutron shield composite material and its preparation side
Method.
Background technique
With the fast development of science and technology, the application of nuclear energy and nuclear technology is grown rapidly in recent years, benefits people
While live, the conventional neutron shielding material that also brings very disruptive to endanger.Neutron has very strong due to being in electroneutral
Penetrability, can to human body generate harm.Currently, main neutron shielding material is primarily present following problems：Bulk density is big,
Mechanical strength is not high, erosion-resisting characteristics is poor, preparation process is complex and costly enterprise.Therefore, high performance neutron shield is prepared
Material has become current urgent problem to be solved.
Technical staff is to conduct in-depth research and technological development the problems such as preparing high-performance radiation-shielding material at present：
Patent CN201510701250 disclose it is a kind of with boron carbide, neutron-absorbing material, aluminium and aluminium alloy preparation mainly for weary combustion
Expect the composite material of storage neutron shield, this method improves on the basis of ensure that neutron shield efficiency to a certain extent
Composite material plasticity, and improve production efficiency.But its major defect is:（1）Complex process, yield rate is low, and price is high；
（2）Bulk density is big；（3）Poor corrosion resistance.Patent CN201510128412.8 discloses one kind with methyl ethylene silica gel
Matrix adds anti-flaming thermal-insulation filler and neutron absorber material, and using two-roll mill, vulcanizing press is prepared for a kind of with resistance
The neutron shielding material of heat-proof quality is fired, there is fire-retardant and heat-proof quality to a certain extent, but its major defect is：（1）Technique
It is complex, it is at high cost.（2）Material mechanical performance is poor.（3）Neutron shield performance is not high.（4）Poor corrosion resistance.
Summary of the invention
The present invention provides a kind of neutron shield composite material and preparation method, this method simple process, high yield rate,
Cost is reduced, the foamed ceramics base neutron shield composite material comprehensive mechanical property of this method preparation is good, neutron shield performance is excellent
It is different, bulk density is small, corrosion resistance is strong.
In order to achieve the above object, the present invention uses following technical scheme：
A kind of neutron shield composite material, using foamed ceramics as matrix, by quality include 60 ~ 90 parts of neutron slowing-down materials, 10 ~ 40
Part neutron absorber material and 0 ~ 10 part of additive.
The material of foamed ceramics matrix described above is Al2O3、ZrO2, one or more of SiC and mullite, hole
Rate is 85% ~ 97%, and pore size is 5 ~ 100ppi；The neutron slowing-down material is polyethylene, polypropylene, polystyrene or poly- first
Base methyl acrylate；The neutron absorber material is the mixture of boron carbide, boron nitride or gadolinium oxide one or more, institute
State average grain diameter≤25 μm of boron carbide, boron nitride and gadolinium oxide；The additive is silane resin acceptor kh-550, KH-
560, KH-570 or titanate coupling agent KR-TTS.
A kind of preparation method of neutron shield composite material, including：
(1) it prepares foamed ceramics matrix and is put into mold after being pre-processed；
(2) 60 ~ 90 mass parts neutron slowing-down materials are heated to melting completely, keep heating temperature 10 DEG C more than its fusing point ~
15 DEG C, 10 ~ 40 mass parts neutron absorber materials are added and are uniformly mixed with 0 ~ 10 mass parts additive, and carry out ultrasonic agitation processing
20 ~ 30min obtains mixed fillers；
(3) in the mold for the mixed fillers injection step (1) for obtaining step (2), by mould after mixed fillers submergence foamed ceramics
Tool be put into vacuum oven, drying temperature is maintained at 10 DEG C ~ 15 DEG C of neutron slowing-down material fusing point or more, vacuumize holding 15 ~
Room temperature is cooling after 20min, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata；
(4) the foamed ceramics based composites after solidification are removed from the molds, remove consolidating for extra spilling foamed ceramics part
Mixed fillers after change.
In step described above, foamed ceramics matrix is prepared described in step (1) and carries out pretreated step be：It will be pre-
Polyurethane foam that treated, which is put into prepared slurry, to be impregnated, and squeezes out additional size, room by the roll pre-set
After the dry 12h of temperature, it is put into 120 DEG C of dry 12h in drying box and green compact is made, put the green body into sintering in high temperature furnace and finally prepare
Foamed ceramics matrix, and the foamed ceramics matrix prepared is put into silane coupling agent and carries out ultrasonic treatment 30min.
Beneficial effects of the present invention：The present invention provides a kind of neutron shield composite material and preparation methods, by poly-
Urethane precursor process prepares the ceramics of the reticulated foam with certain mechanical properties, will melt uniform neutron slowing-down material in
Sub- absorbing material after mixing, is put into foamed ceramics matrix, is higher than slowing material melting temperature negative pressure impregnation, can make melting
Macromolecule slowing material filling a part enters polyurethane and burns inside the hollow hole muscle left after mistake, while filled and process ceramics are empty
Gap；Extra spilling body portion high molecular material is removed after cooling prepares new neutron shielding foamed ceramics composite material；In
The introducing of sub- slowing material not only increases composite material degraded neutron ability and shields neutron rich in neutron absorber material, in
The mixing of sub- absorbing material selection boron carbide, boron nitride and gadolinium oxide one or more micro mist, the mainly neutron of these elements
Absorption cross-section is much larger than other materials and then has extremely strong neutron absorption capability, while the addition of high molecular material compensates for bubble
Foam ceramic material brittleness problems, high molecular material are filled in foamed ceramics hollow hole muscle and surface void, improve composite material
Whole mechanical performance, the composite material prepared have an outstanding mechanical strength, neutron shield performance, corrosion resistance, and
Has many advantages, such as simple process and low cost.
Neutron shield foamed ceramics prepared by the present invention, through detecting：Bulk density is 0.79 ~ 1.44g/cm3；Room temperature pressure resistance
Intensity is 2.3 ~ 10.6MPa；Using 300mCi Am-Be neutron source to shielding foamed ceramics（With a thickness of 2cm）It carries out in irradiation heat
Sub- penetrance is respectively less than 10%.Therefore, neutron shield foamed ceramics composite material volume density prepared by the present invention is small, intensity is high,
With excellent chemerosiveness resistent and neutron shield performance.
Specific embodiment
Embodiment 1
A kind of neutron shield composite material and preparation method, including：
(1) pretreated polyurethane foam is put into prepared slurry and is impregnated, squeezed out by the roll pre-set
Additional size after drying at room temperature 12h, is put into 120 DEG C of dry 12h in drying box and green compact is made；It puts the green body into high temperature furnace and burns
Knot finally prepares foamed ceramics matrix, and the foamed ceramics matrix prepared is put into silane coupling agent and carries out ultrasonic place
After managing 30min, it is put into previously prepared mold.
Foamed ceramics parameter is as follows：Matrix：Al2O3-ZrO；Porosity：85%；Hole density：10PPi；Bulk density：0.7g/
cm3；Length and width 5cm, thick 2cm.
(2) 60 mass parts polyethylene are put into blender and are heated to melting completely, keep heating temperature its fusing point with
Upper 10 DEG C, melt is made to keep lower viscosity, 25 mass parts boron carbides are added and uniformly mix, and carry out ultrasonic agitation processing
20min。
(3) by mold described in mixed fillers injection step (1) prepared in step (2), mixed fillers submergence is steeped
Mold is put into vacuum oven after foam ceramics, heating temperature is maintained at 10 DEG C of polyethylene fusing point or more, vacuumizes holding
Room temperature is cooling after 15min, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata.
(4) the foamed ceramics based composites after solidification are removed from the molds, remove extra spilling foamed ceramics part
Solidification after mixed fillers.
Prepared foamed ceramics base neutron shield composite material, through detecting：Cold crushing strength is：3.2~4.3MPa；
0.87 ~ 0.93g/cm of density3；Thermal neutron shielding rate：95.3%.
Embodiment 2
A kind of neutron shield composite material and preparation method, including：
(1) pretreated polyurethane foam is put into prepared slurry and is impregnated, squeezed out by the roll pre-set
Additional size after drying at room temperature 12h, is put into 120 DEG C of dry 12h in drying box and green compact is made；It puts the green body into high temperature furnace and burns
Knot finally prepares foamed ceramics matrix, and the foamed ceramics matrix prepared is put into silane coupling agent and carries out ultrasonic place
After managing 30min, it is put into previously prepared mold.
Foamed ceramics parameter is as follows：Matrix：Al2O3-SiC；Porosity：90%；Hole density：10PPi；Bulk density：0.4g/
cm3；Length and width 5cm, thick 2cm.
(2) 75 mass parts polyethylene are put into blender and are heated to melting completely, keep heating temperature its fusing point with
Upper 15 DEG C, melt is made to keep lower viscosity, 40 mass parts gadolinium oxides are added and are uniformly mixed with 10 mass parts KH-570, and carry out
Ultrasonic agitation processing 30min.
(3) in the mold for the mixed fillers injection step (1) for obtaining step (2), after mixed fillers submerge foamed ceramics
Mold is put into vacuum oven, drying temperature is maintained at 15 DEG C of neutron slowing-down material fusing point or more, vacuumizes and keeps 20min
Room temperature is cooling afterwards, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata；
(4) the foamed ceramics based composites after solidification are removed from the molds, remove consolidating for extra spilling foamed ceramics part
Mixed fillers after change.
Prepared foamed ceramics base neutron shield composite material, through detecting：Cold crushing strength is：6.2~10.1MPa；
Density：0.97~1.22g/cm3；Thermal neutron shielding rate：99.9%.
Embodiment 3
A kind of neutron shield composite material and preparation method, including：
(1) pretreated polyurethane foam is put into prepared slurry and is impregnated, squeezed out by the roll pre-set
Additional size after drying at room temperature 12h, is put into 120 DEG C of dry 12h in drying box and green compact is made；It puts the green body into high temperature furnace and burns
Knot finally prepares foamed ceramics matrix, and the foamed ceramics matrix prepared is put into silane coupling agent and carries out ultrasonic place
After managing 30min, it is put into previously prepared mold.
Foamed ceramics parameter is as follows：Matrix：Al2O3-MgO；Porosity：85%；Hole density：15PPi；Bulk density：0.5g/
cm3；Length and width 5cm, thick 2cm.
(2) 70 mass parts polyethylene are put into blender and are heated to melting completely, keep heating temperature its fusing point with
Upper 10 DEG C, melt is made to keep lower viscosity, 30 mass parts boron nitride powders and 5 mass parts titanate coupling agent KR-TTS are added
Uniformly mixing, and carry out ultrasonic agitation processing 30min.
(3) in the mold for the mixed fillers injection step (1) for obtaining step (2), after mixed fillers submerge foamed ceramics
Mold is put into vacuum oven, drying temperature is maintained at 15 DEG C of neutron slowing-down material fusing point or more, vacuumizes and keeps 20min
Room temperature is cooling afterwards, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata；
(4) the foamed ceramics based composites after solidification are removed from the molds, remove consolidating for extra spilling foamed ceramics part
Mixed fillers after change.
Prepared foamed ceramics base neutron shield composite material, through detecting：Cold crushing strength is：2.6~4.2MPa；
Density：1.1~1.42g/cm 3；Thermal neutron shielding rate：90.5%.
Embodiment 4
A kind of neutron shield composite material and preparation method, including：
(1) pretreated polyurethane foam is put into prepared slurry and is impregnated, squeezed out by the roll pre-set
Additional size after drying at room temperature 12h, is put into 120 DEG C of dry 12h in drying box and green compact is made；It puts the green body into high temperature furnace and burns
Knot finally prepares foamed ceramics matrix, and the foamed ceramics matrix prepared is put into silane coupling agent and carries out ultrasonic place
After managing 30min, it is put into previously prepared mold.
Foamed ceramics parameter is as follows：Matrix：Al2O3-MgO；Porosity：95%；Hole density：15PPi；Bulk density：0.5g/
cm3；Length and width 5cm, thick 2cm.
(2) 75 mass parts polypropylene are put into blender and are heated to melting completely, keep heating temperature its fusing point with
Upper 15 DEG C, melt is made to keep lower viscosity.35 mass parts boron carbide powders are added uniformly to mix with 8 mass parts KH-550, and
Carry out ultrasonic agitation processing 25min.
(3) in the mold for the mixed fillers injection step (1) for obtaining step (2), after mixed fillers submerge foamed ceramics
Mold is put into vacuum oven, drying temperature is maintained at 10 DEG C of neutron slowing-down material fusing point or more, vacuumizes and keeps 20min
Room temperature is cooling afterwards, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata；
(4) the foamed ceramics based composites after solidification are removed from the molds, remove consolidating for extra spilling foamed ceramics part
Mixed fillers after change.
Prepared foamed ceramics base neutron shield composite material, through detecting：Cold crushing strength is 2.31 ~ 3.95MPa；
Density：1.2~1.33g/cm 3；Thermal neutron shielding rate：96.5%.
Embodiment 5
A kind of foamed ceramics base neutron shield composite material and preparation method, including：
(1) pretreated polyurethane foam is put into prepared slurry and is impregnated, squeezed out by the roll pre-set
Additional size after drying at room temperature 12h, is put into 120 DEG C of dry 12h in drying box and green compact is made；It puts the green body into high temperature furnace and burns
Knot finally prepares foamed ceramics matrix, and the foamed ceramics matrix prepared is put into silane coupling agent and carries out ultrasonic place
After managing 30min, it is put into previously prepared mold.
Foamed ceramics parameter is as follows：Matrix：Al2O3-ZrO；Porosity：95%；Hole density：15PPi；Bulk density：0.7g/
cm3；Length and width 5cm, thick 2cm.
(2) 70 mass parts polypropylene are put into blender and are heated to melting completely, keep heating temperature its fusing point with
Upper 10 DEG C, melt is made to keep lower viscosity.30 mass parts gadolinium oxide powders are added uniformly to mix with 6 parts of KH-570, and carry out
Ultrasonic agitation processing 25min.
(3) in the mold for the mixed fillers injection step (1) for obtaining step (2), after mixed fillers submerge foamed ceramics
Mold is put into vacuum oven, drying temperature is maintained at 15 DEG C of neutron slowing-down material fusing point or more, vacuumizes and keeps 20min
Room temperature is cooling afterwards, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata；
(4) the foamed ceramics based composites after solidification are removed from the molds, remove consolidating for extra spilling foamed ceramics part
Mixed fillers after change.
Prepared foamed ceramics base neutron shield composite material, through detecting：Cold crushing strength is：3.5~4.6MPa；
Density：1.07~1.23g/cm 3；Thermal neutron shielding rate：99.9%.
Embodiment 6
A kind of neutron shield composite material and preparation method, including：
(1) pretreated polyurethane foam is put into prepared slurry and is impregnated, squeezed out by the roll pre-set
Additional size after drying at room temperature 12h, is put into 120 DEG C of dry 12h in drying box and green compact is made；It puts the green body into high temperature furnace and burns
Knot finally prepares foamed ceramics matrix, and the foamed ceramics matrix prepared is put into silane coupling agent and carries out ultrasonic place
After managing 30min, it is put into previously prepared mold.
Foamed ceramics parameter is as follows：Matrix：Al2O3-SiC；Porosity：95%；Hole density：15PPi；Bulk density：0.4g/
cm3；Length and width 5cm, thick 2cm.
(2) 85 mass parts polypropylene are put into blender and are heated to melting completely, keep heating temperature its fusing point with
Upper 15 DEG C, melt is made to keep lower viscosity, 20 mass parts boron carbide powders are added and are uniformly mixed with 5 mass parts KH-560, and
Carry out ultrasonic agitation processing 30min.
(3) in the mold for the mixed fillers injection step (1) for obtaining step (2), after mixed fillers submerge foamed ceramics
Mold is put into vacuum oven, drying temperature is maintained at 15 DEG C of neutron slowing-down material fusing point or more, vacuumizes and keeps 15min
Room temperature is cooling afterwards, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata；
(4) the foamed ceramics based composites after solidification are removed from the molds, remove consolidating for extra spilling foamed ceramics part
Mixed fillers after change.
Prepared foamed ceramics base neutron shield composite material, through detecting：Cold crushing strength is：7.3~10.6MPa；
Density：0.87~1.11g/cm 3；Thermal neutron shielding rate：93.9%.
Embodiment 7
A kind of neutron shield composite material and preparation method, including：
(1) pretreated polyurethane foam is put into prepared slurry and is impregnated, squeezed out by the roll pre-set
Additional size after drying at room temperature 12h, is put into 120 DEG C of dry 12h in drying box and green compact is made；It puts the green body into high temperature furnace and burns
Knot finally prepares foamed ceramics matrix, and the foamed ceramics matrix prepared is put into silane coupling agent and carries out ultrasonic place
After managing 30min, it is put into previously prepared mold.
Foamed ceramics parameter is as follows：Matrix：Al2O3-MgO；Porosity：90%；Hole density：5PPi；Bulk density：0.5g/
cm3；Length and width 5cm, thick 2cm.
(2) 80 mass parts polystyrene are put into blender and are heated to melting completely, keep heating temperature in its fusing point
Above 15 DEG C, melt is made to keep lower viscosity, 15 mass parts boron carbide powders is added and are uniformly mixed with 5 mass parts KH-560,
And carry out ultrasonic agitation processing 25min.
(3) in the mold for the mixed fillers injection step (1) for obtaining step (2), after mixed fillers submerge foamed ceramics
Mold is put into vacuum oven, drying temperature is maintained at 15 DEG C of neutron slowing-down material fusing point or more, vacuumizes and keeps 15min
Room temperature is cooling afterwards, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata；
(4) the foamed ceramics based composites after solidification are removed from the molds, remove consolidating for extra spilling foamed ceramics part
Mixed fillers after change.
Prepared foamed ceramics base neutron shield composite material, through detecting：Cold crushing strength is：2.3~3.6MPa；
Density：0.79~1.27g/cm 3；Thermal neutron shielding rate：92.3%.
Embodiment 8
A kind of neutron shield composite material and preparation method, including：
(1) pretreated polyurethane foam is put into prepared slurry and is impregnated, squeezed out by the roll pre-set
Additional size after drying at room temperature 12h, is put into 120 DEG C of dry 12h in drying box and green compact is made；It puts the green body into high temperature furnace and burns
Knot finally prepares foamed ceramics matrix, and the foamed ceramics matrix prepared is put into silane coupling agent and carries out ultrasonic place
After managing 30min, it is put into previously prepared mold.
Foamed ceramics parameter is as follows：Matrix：Al2O3-MgO；Porosity：90%；Hole density：5PPi；Bulk density：0.5g/
cm3；Length and width 5cm, thick 2cm.
(2) 75 mass parts polystyrene are put into blender and are heated to melting completely, keep heating temperature in its fusing point
Above 15 DEG C, melt is made to keep lower viscosity.35 mass parts gadolinium oxide powders are added uniformly to mix with 6 mass parts KH-560,
And carry out ultrasonic agitation processing 30min.
(3) in the mold for the mixed fillers injection step (1) for obtaining step (2), after mixed fillers submerge foamed ceramics
Mold is put into vacuum oven, drying temperature is maintained at 15 DEG C of neutron slowing-down material fusing point or more, vacuumizes and keeps 15min
Room temperature is cooling afterwards, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata；
(4) the foamed ceramics based composites after solidification are removed from the molds, remove consolidating for extra spilling foamed ceramics part
Mixed fillers after change.
Prepared foamed ceramics base neutron shield composite material, through detecting：Cold crushing strength is：3.5~5.6MPa；
Density：1.21~1.44g/cm 3；Neutron shield efficiency is 99.9%.
The above is only the preferred embodiment of the present invention, is not intended to limit the present invention in any form, Ren Heben
Field technical staff, without departing from the scope of the present invention, according to the technical essence of the invention, to above embodiments institute
Any improvement etc. made, fall within the scope of protection of the technical scheme of the present invention within.
Claims (7)
1. a kind of neutron shield composite material, which is characterized in that include 60 ~ 90 parts of neutrons by quality using foamed ceramics as matrix
Slowing material, 10 ~ 40 parts of neutron absorber materials and 0 ~ 10 part of additive.
2. neutron shield composite material according to claim 1, which is characterized in that the material of the foamed ceramics matrix is
Al2O3、ZrO2, one or more of SiC and mullite, the porosity of the foamed ceramics matrix is 85% ~ 97%, and aperture is big
Small is 5ppi ~ 100ppi.
3. neutron shield composite material according to claim 1, which is characterized in that the neutron slowing-down material is poly- second
Alkene, polypropylene, polystyrene or polymethyl methacrylate.
4. neutron shield composite material according to claim 1, which is characterized in that the neutron absorber material is carbonization
One of boron, boron nitride or gadolinium oxide or more than one mixture, the average grain of the boron carbide, boron nitride and gadolinium oxide
Diameter≤25 μm.
5. neutron shield composite material according to claim 1, which is characterized in that the additive is silane coupling agent
KH-550, KH-560, KH-570 or titanate coupling agent KR-TTS.
6. a kind of preparation method of neutron shield composite material, which is characterized in that include the following steps：
(1) it prepares foamed ceramics matrix and is put into mold after being pre-processed；
(2) 60 ~ 90 parts of neutron slowing-down materials are heated to melting completely, keep heating temperature 10 DEG C ~ 15 DEG C more than its fusing point,
10 ~ 40 parts of neutron absorber materials are added uniformly to mix with 0 ~ 10 part of additive, and carry out ultrasonic agitation 20 ~ 30min of processing, obtain
Mixed fillers；
(3) in the mold for the mixed fillers injection step (1) for obtaining step (2), by mould after mixed fillers submergence foamed ceramics
Tool be put into vacuum oven, drying temperature is maintained at 10 DEG C ~ 15 DEG C of neutron slowing-down material fusing point or more, vacuumize holding 15 ~
Room temperature is cooling after 20min, and negative pressure inserts mixed fillers sufficiently in foamed ceramics stomata；
(4) the foamed ceramics based composites after solidification are removed from the molds, remove consolidating for extra spilling foamed ceramics part
Mixed fillers after change.
7. the preparation method of neutron shield composite material according to claim 6, which is characterized in that described in step (1)
It prepares foamed ceramics matrix and carries out pretreated step and be：Pretreated polyurethane foam is put into prepared slurry
Dipping squeezes out additional size by the roll that pre-sets, after drying at room temperature 12h, is put into 120 DEG C of dry 12h in drying box
Green compact are made, puts the green body into be sintered in high temperature furnace and finally prepares foamed ceramics matrix, and the foamed ceramics base that will be prepared
Body is put into silane coupling agent and carries out ultrasonic treatment 30min.
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| CN111153712A (en) * | 2019-12-31 | 2020-05-15 | 南京即衡科技发展有限公司 | Porous ceramic interpenetrating network neutron shielding composite material and preparation method thereof |
| CN113149703A (en) * | 2021-05-28 | 2021-07-23 | 湖北工业大学 | Neutron radiation prevention light gypsum board and preparation method thereof |
| CN113306239A (en) * | 2021-04-25 | 2021-08-27 | 郑州大学 | Ultrahigh molecular weight polyethylene fiber/boron nitride composite material for neutron radiation protection and preparation method thereof |
| CN113999043A (en) * | 2021-10-29 | 2022-02-01 | 南京航空航天大学 | Interpenetrating mullite/boron carbide foamed ceramic high-temperature-resistant neutron shielding material and preparation method thereof |
| CN114292108A (en) * | 2021-11-29 | 2022-04-08 | 华能核能技术研究院有限公司 | Boron carbide-gadolinium oxide neutron absorber material for control rod and preparation method thereof |
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| CN114292108B (en) * | 2021-11-29 | 2023-01-31 | 华能核能技术研究院有限公司 | Boron carbide-gadolinium oxide neutron absorber material for control rod and preparation method thereof |
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