CN105957576B - A kind of moderation of neutrons Al/AlF3Composite and preparation method thereof - Google Patents
A kind of moderation of neutrons Al/AlF3Composite and preparation method thereof Download PDFInfo
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- CN105957576B CN105957576B CN201610272302.3A CN201610272302A CN105957576B CN 105957576 B CN105957576 B CN 105957576B CN 201610272302 A CN201610272302 A CN 201610272302A CN 105957576 B CN105957576 B CN 105957576B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
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- G21K1/10—Scattering devices; Absorbing devices; Ionising radiation filters
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Abstract
The invention belongs to used by nuclear reactor Material Field, a kind of moderation of neutrons Al/AlF is specifically disclosed3Composite and preparation method thereof.The preparation method comprises the following steps：By AlF3, Al powder in mass ratio 1:1~9:1 weighing is mixed, and adds sintering aid and ball milling, screening；Powder is loaded into hot pressing die, hot pressed sintering is carried out to hot pressing die in sintering furnace；It is warming up to after maximum sintering temperature and is incubated a period of time, cooled down after the completion of insulation, the moderation of neutrons Al/AlF is made3Composite.Using the powder that purity is high, particle is small in the present invention, coordinate ball-milling technology to be sufficiently mixed material, carry out hot pressed sintering in the temperature less than metallic aluminium fusing point, it is to avoid the segregation of composition, the slowing material composition of preparation is uniform, impurity content is few, and material density is in 2.6g/cm3More than, the high standards of nuclear material can be met.
Description
Technical field
The invention belongs to used by nuclear reactor Material Field, and in particular to a kind of moderation of neutrons Al/AlF3Composite and
Its preparation method.
Background technology
Boron neutron capture therapy (BNCT) is considered as the effective ways for treating tumour, and its general principle is by with selection
The drug injection containing 10B of property enters blood of human body, and drug-rich uses epithermal neutron line irradiated lesion portion in tumour cell
Position, 10B absorbs neutron generation (n, α) reaction releasing high-energy, short-range α particles and 7Li ions, and (sphere of action is about 15 μ
M, suitable with cell dia), normal tissue cell can be avoided damage to while tumour cell is killed.In BNCT technology applications
In, the exploitation of height targeting 10B medicines and the acquisition of epithermal neutron line are to determine the key that can the technology be used widely.
Epithermal neutron energy needed for BNCT is between 1eV~10keV, it is desirable to which epithermal neutron portion is as far as possible
Greatly, thermal neutron, fast neutron and gamma Rays portion try one's best it is small arrive bottom line, such radiation field need in reactor or
Realized on accelerator neutron generator.Reactor neutron spectrum is generally the mixed spectrum of various energy between 0~20MeV, need to be using spy
The neutron slowing-down material very designed is filtered.Aluminium, aluminum oxide and aluminum fluoride are conventional neutron slowing-down materials, in practical application
In, it is many that neutron streaming needed for BNCT is obtained using aluminium and the combination of aluminum fluoride different proportion.The application example such as core of Tsing-Hua University 901
The optimal slowing material of reactor is ω (AL):ω(ALF3) it is 2:3, thickness is not less than 50cm；Chinese atomic energy science research
The neutron radiating device in hospital of reactor engineering research institute of institute exploitation, preferable slowing material is bulk density ρ ＞ 2.70g/cm3、
ω(AL):ω(ALF3) it is 3:7, its thickness is not less than 70cm.
In the neutron streaming that differential responses heap is produced, all types of neutron portion differences are obvious, it is adaptable to a certain spy
The neutron slowing-down material for determining reactor usually requires specific customization.Simulated by related software, it may be determined that suitable for certain a pile
The parameters such as slowing material composition, density, the thickness of type.At present, domestic existing many units expand the research on BNCT, many
The special micro reactor of type is also among structure, under the pressure of can not obtain densification Al/AlF3Sintered body, most reactors are only
Al, AlF of filling can be used3Mixture.Because mixture does not have intensity to say, therefore given shape can not be processed into, also not
It is readily transported and installs.In addition, mixture is difficult to reach higher volumes density, identical moderating effect, the peace of mixture are realized
Thickness is filled also much larger than dense sintering body.In a word, the slowing material performance used at present can not meet requirement, limit BNCT skills
The popularization and application of art, fine and close Al/AlF3The preparation of composite helps to promote BNCT fast-developing, and good fortune is brought to tumor patient
Sound.
The content of the invention
In place of shortcoming and defect to solve prior art, primary and foremost purpose of the invention is that providing a kind of moderation of neutrons uses
Al/AlF3The preparation method of composite.
Another object of the present invention is to provide, a kind of consistency is high, mechanical property is good, the uniform moderation of neutrons of composition is used
Al/AlF3Composite.
The object of the invention is achieved through the following technical solutions：
A kind of moderation of neutrons Al/AlF3The preparation method of composite, comprises the following steps：
(1) raw material is mixed：
By AlF3, Al powder in mass ratio 1:1~9:1 weighing is mixed, and adds sintering aid and ball milling, screening, material dress
Enter vacuum bag preservation.
(2) hot pressed sintering prepares Al/AlF3Composite：
Powder made from step (1) is loaded into hot pressing die, hot pressed sintering is carried out to hot pressing die in sintering furnace；Sintering
During, when room temperature is to 400 DEG C, heating rate is 10~20 DEG C/min, 2~7 DEG C/min of heating rate at more than 400 DEG C, is risen
Temperature cools down after the completion of insulation to insulation a period of time after 450~600 DEG C, that is, the moderation of neutrons Al/AlF is made3Composite wood
Material.
According to the present invention, the AlF employed in step (1)3And the purity of aluminium powder is above 99.9%, granularity 5 μm with
Under；AlF3, Al powder mass ratio be preferably 1:1、3:7 or 1:9.
According to the present invention, sintering aid is preferably LiF, NaF, MgF described in step (1)2Middle one kind, sintering aid is added
Amount is preferably the 1% of aluminium powder and aluminum fluoride quality sum.
According to the present invention, ball milling described in step (1) refers to use Quick ball grinder ball milling, it is preferred to use the poly- ammonia of 500ml
Ester ball grinder and diameter 2mm zirconia balls mill carry out ball milling；The Quick ball grinder is preferably planetary Quick ball grinder, work
Make rotating speed for 200r/min, ball milling method is preferably dry grinding, and Ball-milling Time is 2h.
According to the present invention, screening described in step (1) refers to be sieved using standard screen, the sieve mesh of preferred standard sieve
Number is 60 mesh.
According to the present invention, hot pressing die is preferably graphite jig described in step (2), and preferably inner space 100mm ×
100mm, height 150mm.
According to the present invention, sintering furnace described in step (2) is preferably vacuum/atmosphere hot pressing sintering stove, sintering process it is true
Reciprocal of duty cycle is preferably 7 × 10-3Pa。
According to the present invention, when the temperature of hot pressed sintering is below 400 DEG C described in step (2) heating rate be 10 DEG C/
Min, the temperature of hot pressed sintering more than 400 DEG C after heating rate be 5 DEG C/min, be warming up to soaking time after 450~600 DEG C excellent
Elect 30min as, cooling system is furnace cooling.
According to the present invention, pressure is preferably 10MPa when the temperature of hot pressed sintering is below 400 DEG C described in step (2), heat
Pressure is preferably 20MPa after the temperature sintered is pressed more than 400 DEG C.
The Al/AlF obtained after above-mentioned sintering3Composite measures bulk density, Al/AlF produced by the present invention3Composite wood
Expect consistency in 2.6g/cm3More than；It is preferred that Al/AlF3Neutron slowing-down material consistency is 2.6~2.9g/cm3。
Moderation of neutrons Al/AlF obtained above3Composite also includes being machined it, by composite
Sample polishes, cleans removal of impurities, makes composite is more convenient to use and transport, specifically includes：Using surface grinding machine to upper and lower surface
Plain grinding processing is carried out, it is flat using CNC machining center offsides facing cut, using the chip for being cleaned by ultrasonic removal surface attachment, after drying
Vacuum packaging is standby.
Surface grinding machine of the present invention, CNC machining centers, ultrasonic cleaning ripple cleaning machine are general common equipment.
Due to Al/AlF3Composite is used as neutron slowing-down material, it is necessary to meet the rigors of nuclear material.Must possess
Following characteristics, one is that composition is uniform, impurity content is few；The features such as two be compact structure, mechanical strength is high.For existing production
The deficiency of technology, the present invention is sufficiently mixed powder using high-purity, superfine aluminium power and aluminum fluoride as raw material by high speed planetary mills, protects
Each component is evenly distributed in card material；The use of polyurethane ball-milling pot and zirconia ball mill, reduces impurity introducing as far as possible；It is logical
The hot pressed sintering crossed under high vacuum, is prepared for the Al/AlF of high-compactness3Composite board.Sheet material adds by grinding, drilling
After work, moderated reactor neutron beam can be integrally used for by piecing together.
Compared with prior art, the present invention has advantages below and beneficial effect：
(1) Al/AlF is prepared using hot-pressing sintering technique in the present invention3Composite, products obtained therefrom is fine and close, performance is stable,
The strength of materials can meet the basic demand of the machinings such as car abrasive drilling milling, be readily transported and dismount, meet neutron radiating device in hospital
Deng the index request of neutron slowing-down material used in micro reactor.
(2) present invention is by adjusting ω (Al):ω(AlF3) ratio, change sintering aid species, it is hot at different temperatures
Pressure sintering prepares density and the adjustable slowing material of Al/F ratios, can meet the specific requirement of differential responses heap, can realize material
That expects is customized.
(3) ball-milling technology is coordinated to be sufficiently mixed material, less than gold using the powder that purity is high, particle is small in the present invention
The temperature for belonging to aluminium fusing point carries out hot pressed sintering, it is to avoid the segregation of composition, and the slowing material composition of preparation is uniform, impurity content
It is few, the high standards of nuclear material can be met.
Brief description of the drawings
Fig. 1 is ω (Al) after the different sintering aids of the prepared addition of embodiment 1:ω(AlF3) it is 3:7 volume of sample density
With sintering temperature relation.
Fig. 2, which is that embodiment 1 is prepared, contains 1%LiF, and sintering temperature is 600 DEG C of Al/AlF3Composite is through 600 DEG C of burnings
Section SEM photograph after knot.
Fig. 3, which is that embodiment 1 is prepared, contains 1%LiF, and sintering temperature is 600 DEG C of Al/AlF3The X-ray of composite is spread out
Penetrate collection of illustrative plates.
Difference ω (Al) when Fig. 4 is addition 1wt.%LiF sintering aids prepared by embodiment 2:ω(AlF3) volume of sample
Density is with sintering temperature variation relation.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
Raw material explanation：Aluminium powder purity 99.9% in embodiment, 5 μm of meso-position radius；Aluminum fluoride purity 99.9%, the μ of meso-position radius 5
m；LiF、NaF、MgF2Purity more than 99%.The manufacturer of all raw materials is Chemical Reagent Co., Ltd., Sinopharm Group.
Al/AlF3The density of composite is tested with Archimedes's drainage, is comprised the following steps that：
1. testing sample is placed in 50 DEG C of baking ovens and dried after 24h, in weighing testing sample at room temperature on assay balance
Dry weight (W1), it is accurate to 0.001g；
2. the testing sample after 1. step is weighed, which is put into boiling water, boils 2h, after room temperature is cooled to, and weighs saturation and treats
Buoyant weight (W of the test sample product in water2), it is accurate to 0.001g；
3. the testing sample after 2. step is weighed takes out from water, is gently wiped the unnecessary moisture of surface of test piece with gauze
It is rapid to weigh the aerial weight in wet base (W of saturation testing sample after falling3), it is accurate to 0.001g；
4. repeat above steps and take average 3 times, then according to formula：ρ=W1ρWater/(W3-W2) calculate testing sample body
Product density.
Al/AlF3The phase composition of composite is by X-ray diffraction (XRD) atlas analysis, and microstructure is by scanning electricity
Sub- microscope (SEM) observation.
Embodiment 1：
A kind of moderation of neutrons Al/AlF3The preparation method of composite, step is as follows：
(1) four groups of raw materials, every group of aluminium powder containing 30g, 70g aluminium fluoride powders, numbering 1#, 2#, 3#, 4# are weighed.Three kinds of sintering are helped
Agent (LiF, NaF, MgF2) respectively weigh 1g and be added sequentially in 1#, 2#, 3#, 4# is without sintering aid.By each group powder point
It is not fitted into 500ml polyurethane ball-milling pots, adds after 300g zirconia ball mills with 200r/min speed planetary ball mill 2h, ball
Mill terminated 60 mesh standard sieves separation zirconia ball, and the vacuum powder after sieving packages spare.
(2) weigh tetra- groups of each 50g of powder of 1#, 2#, 3#, 4# after sieving in step (1) be separately added into 100mm ×
In 100mm hot pressing dies, mould, which loads after hot-pressed sintering furnace, to be sealed and vacuumizes, and is started to warm up after vacuum no longer changes,
Heated up before 400 DEG C according to 10 DEG C/min speed, holding temperature is risen to according to 5 DEG C/min heating rates after 400 DEG C.Hot pressing pressure
Being adjusted to of power maintains 20MPa after 10MPa before 400 DEG C, 400 DEG C.The sintering temperature difference of tetra- groups of powders of 1#, 2#, 3#, 4#
450 DEG C, 500 DEG C, 550 DEG C, 600 DEG C are chosen to be, soaking time is 30min.
(3) insulation terminates rear furnace cooling, lays down oil cylinder working-pressure.Sample is taken out in sufficiently cool rear blow-on, determines volume close
Degree, XRD, sem analysis are carried out to sample.To the Al/AlF produced3Sheet material is machined, is cleaned by ultrasonic, and is wrapped after drying
Equipment is used.Volume of sample density is wherein added after different sintering aids with sintering temperature situation of change as shown in figure 1, horizontal in figure sit
Mark is sintering temperature (DEG C), and ordinate is bulk density (g/cm3).From fig 1, it is seen that when being not added with sintering aid (None),
It is only 2.49g/cm through 600 DEG C of sintering bulk densities3；Add 1%MgF2When, it is not notable that density improves effect；Add 1%NaF or
LiF, sintering activity is obviously improved, through 600 DEG C sinter after material relative density more than 98%, realize material densification (>=
95%).When excessive temperature is sintered, because metallic aluminium starts to produce liquid phase, mould, materials A l/F are easily overflowed under pressure
Than occurring uncontrollable change, it is impossible to the practical slowing material of batch production.
SEM photograph is as shown in Fig. 2 image displaying material crystallite dimension is at 2 μm after addition 1%LiF samples are sintered through 600 DEG C
Hereinafter, crystal grain finite growing in sintering process is shown, Al, AlF can be effectively ensured in tiny crystal grain3Be uniformly distributed.It can be seen that,
The sample internal particle is tiny, and dense structure, stomata is less.
The finally obtained Al/AlF of the present embodiment3Composite principal crystalline phase is aluminum fluoride and aluminium, because sintering aid contains
Amount is less, and various sample XRD spectrum signatures are consistent.Fig. 3, which is that embodiment 1 is prepared, contains 1%LiF, and sintering temperature is 600 DEG C
Al/AlF3The X ray diffracting spectrum of composite；Abscissa is 2 θ (deg.), and ordinate is diffraction peak intensity Intensity
(a.u.).Fig. 3 shows that material only has Al and AlF3Diffraction maximum, do not have other miscellaneous peaks, illustrate material composition do not change,
Impurity content is seldom.Other several groups of samples XRD features are consistent with Fig. 3.
Most rigors generally to pile neutron slowing material are exactly that material purity is high, the impurity member in addition to Al, F, O
The element especially larger element of atomic weight easily absorbs neutron and produces energetic gamma rays, and gamma-rays can have a strong impact on neutron beam quality.
Al/AlF manufactured in the present embodiment3Composite, has used high-purity (99.9%) raw material, and mechanical milling process has used poly- ammonia
Ester ball grinder and wear-resisting zirconia ball mill ensure that neutron is slow to reduce the introducing of impurity as far as possible by both approach
Change the high-purity of material.Confirmed through heap work institute of China Atomic Energy Science Research Institute MCNP analog results, a small amount of LiF, NaF, MgF2
Introducing Deng fluoride is not significantly affected to the generation of neutron beam quality.
The bulk density of neutron slowing-down material has had influence on each element atomic density in material, and (certain in unit volume is former
Subnumber).The process nature of moderation of neutrons is that in motion process with atomic nucleus elastic scattering, neutron loss section transfer occur for neutron
" slowing down " can be realized, wherein, the probability and number of times that elastic scattering occurs are determined by the thickness and atomic density of slowing material.For reality
Existing specific moderating effect, can reduce the thickness ginseng of slowing material during using compared with high atoms density (high volume density) slowing material
Number so that material is lighter, save space.In addition high volume density assigns material higher mechanical property, and material is more resistant to pressure, resistance to
Impact, is conducive to being machined, transport, install and removing.Herein, 2.6g/cm is higher than to the density prepared by the present embodiment3Material
Compression strength, fracture toughness, Brinell hardness and the thermal conductivity of material are illustrated.Other experimental group density are relatively low, are unfavorable for machine
Tool is processed and transported, the slowing material not recommended, is only used for disclosing bulk density in material preparation process warm with sintering
The variation tendency improved and prominent LiF, NaF are spent to the remarkable result (being shown in Table 1) of promotion densifying materials, and performance data is no longer opened up
Show.
The neutron slowing-down material density of table 1, mechanical property, thermal conductivity
Four groups of slowing material intensity more than being prepared in the present embodiment can meet the behaviour such as machining, transport, installing/dismounting
Make, it is impact resistance, non-breakable, possess installation use condition.
Embodiment 2：
A kind of moderation of neutrons Al/AlF3The preparation method of composite, step is as follows：
(1) claim according to 1# (50g aluminium, 50g aluminum fluorides), 2# (30g aluminium, 70g aluminum fluorides), 3# (10g aluminium, 90g aluminum fluorides)
Three groups of raw materials are taken, every group is added 1g LiF.Each group powder is respectively charged into 500ml polyurethane ball-milling pots, 300g oxygen is added
Change after zirconium ball milling with 200r/min speed planetary ball mill 2h, ball milling terminated 60 mesh standard sieves separation zirconia ball, sieving
Vacuum powder afterwards packages spare.
(2) three groups of each 50g of powder after being sieved in step (1) are weighed and are separately added into 100mm × 100mm hot pressing dies
In, mould is sealed and vacuumized after loading hot-pressed sintering furnace, is started to warm up after vacuum no longer changes, before 400 DEG C according to
10 DEG C/min speed is heated up, and holding temperature is risen to according to 5 DEG C/min heating rates after 400 DEG C.Hot pressing pressure is adjusted to 400
10MPa before DEG C, 400 DEG C maintain 20MPa afterwards.Sintering temperature is chosen to be 540 DEG C, 560 DEG C, 580 DEG C, 600 DEG C, soaking time
It is 30min.
(3) insulation terminates rear furnace cooling, lays down oil cylinder working-pressure.Sample is taken out in sufficiently cool rear blow-on, determines volume close
Degree, XRD, sem analysis are carried out to sample.To the Al/AlF produced3Sheet material is machined, is cleaned by ultrasonic, and is wrapped after drying
Equipment is used.
Fig. 4 is that the addition of embodiment 2 1%LiF is used as difference ω (Al) during sintering aid:ω(AlF3) volume of sample density with
Sintering temperature relation.Fig. 4 shows that a series of different densities and difference can be prepared by feed change proportioning and sintering temperature
Al/F than slowing material, the customized of micro- pile neutron slowing material can be realized.
Slowing material manufactured in the present embodiment, density is above 2.6g/cm3, compression strength >=250MPa, fracture toughness >=
7MPa, hardness >=50HBS, it is adaptable to which grinding drill milling etc. adds a little processing, intensity can guarantee that material in transport, installation, using process
In by normal impact, extruding when be not deformed, ftracture, disintegrate.The present embodiment is by changing the ω (Al) of dispensing:ω
(AlF3) and adjust sintering temperature, the Al/F ratios and atomic density of slowing material are changed, differential responses heap slowing down material can be met
The specific requirement of material.For a certain model reactor, the slowing down material determined using which kind of component, density can be simulated by MCNP
Material, has been provided the user to more more options.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of moderation of neutrons Al/AlF3The preparation method of composite, it is characterised in that comprise the following steps：
(1) by AlF3, Al powder in mass ratio 1:1~9:1 weighing is mixed, and adds sintering aid and ball milling and screening；
(2) powder made from step (1) is loaded into hot pressing die, hot pressed sintering is carried out to hot pressing die in sintering furnace；Hot pressing
In sintering process, started to warm up from room temperature, when rising to below 400 DEG C, heating rate is 10~20 DEG C/min, at more than 400 DEG C
2~7 DEG C/min of heating rate, is warming up to after 450~600 DEG C and is incubated a period of time, is cooled down after the completion of insulation, that is, in being made described
Sub- slowing down Al/AlF3Composite.
2. moderation of neutrons Al/AlF according to claim 13The preparation method of composite, it is characterised in that step
(1) AlF employed in3And the purity of Al powder is above 99.9%, granularity is below 5 μm；AlF3Mass ratio with Al powder is 1:
1、3:7 or 1:9.
3. moderation of neutrons Al/AlF according to claim 13The preparation method of composite, it is characterised in that step
(1) sintering aid described in is LiF, NaF, MgF2Middle one kind, sintering aid addition is Al powder and AlF3The 1% of quality sum.
4. moderation of neutrons Al/AlF according to claim 13The preparation method of composite, it is characterised in that step
(1) ball milling described in refers to that using Quick ball grinder ball milling rotational speed of ball-mill is 200r/min, and ball milling method is dry grinding, during ball milling
Between be 2h；
Screening described in step (1) refers to sieve using 60 eye mesh screens.
5. moderation of neutrons Al/AlF according to claim 13The preparation method of composite, it is characterised in that step
(2) 100mm of hot pressing die inner space described in × 100mm, height 150mm.
6. moderation of neutrons Al/AlF according to claim 13The preparation method of composite, it is characterised in that step
(2) sintering furnace described in is vacuum/atmosphere hot pressing sintering stove, and the vacuum of hot pressed sintering process is 7 × 10-3Pa。
7. moderation of neutrons Al/AlF according to claim 13The preparation method of composite, it is characterised in that step
(2) when the temperature of hot pressed sintering described in is below 400 DEG C heating rate be 10 DEG C/min, temperature more than 400 DEG C after heating
Speed is 5 DEG C/min, and it is 30min to be warming up to soaking time after 450~600 DEG C, and cooling system is furnace cooling.
8. moderation of neutrons Al/AlF according to claim 13The preparation method of composite, it is characterised in that step
(2) when the temperature of hot pressed sintering described in is below 400 DEG C pressure be 10MPa, the temperature of hot pressed sintering more than 400 DEG C after pressure
Power is 20MPa.
9. moderation of neutrons Al/AlF according to claim 13The preparation method of composite, it is characterised in that step
(2) moderation of neutrons Al/AlF is made in hot pressed sintering3Also including the use of surface grinding machine to moderation of neutrons Al/ after composite
AlF3The upper and lower surface of composite carries out plain grinding processing, using CNC machining centers to moderation of neutrons Al/AlF3Composite
Side milling put down, and using be cleaned by ultrasonic remove surface attachment chip.
10. a kind of moderation of neutrons Al/AlF3Composite, it is characterised in that during it is as described in any one of claim 1 to 9
Sub- slowing down Al/AlF3The preparation method of composite is prepared, and its consistency is in 2.6g/cm3More than.
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| CN108892161B (en) * | 2018-08-22 | 2020-05-05 | 淮阴师范学院 | Method for preparing nano aluminum fluoride octahedron by using nano aluminum as raw material |
| TWI691238B (en) * | 2019-04-12 | 2020-04-11 | 中國鋼鐵股份有限公司 | Manufacturing method for neutron moderating material |
| CN111072387A (en) * | 2019-12-31 | 2020-04-28 | 中国建筑材料科学研究总院有限公司 | Aluminum fluoride composite ceramic and preparation method thereof |
| CN112831678B (en) * | 2020-12-29 | 2022-03-25 | 山东亚赛陶瓷科技有限公司 | Aluminum/aluminum fluoride composite ceramic neutron moderator and preparation method thereof |
| TWI804800B (en) * | 2021-01-19 | 2023-06-11 | 中國鋼鐵股份有限公司 | Neutron moderator material and method for producing the same |
| CN113186440A (en) * | 2021-04-28 | 2021-07-30 | 禾材高科(苏州)有限公司 | Aluminum fluoride-based ceramic neutron moderating material and preparation method thereof |
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