CN109943763A - A kind of preparation method of high thermal conductivity fuel ball - Google Patents
A kind of preparation method of high thermal conductivity fuel ball Download PDFInfo
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- CN109943763A CN109943763A CN201910323961.9A CN201910323961A CN109943763A CN 109943763 A CN109943763 A CN 109943763A CN 201910323961 A CN201910323961 A CN 201910323961A CN 109943763 A CN109943763 A CN 109943763A
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Abstract
The invention discloses a kind of preparation methods of high thermal conductivity fuel ball, comprising: by W/Mo/ diamond/SiC powder and UO2Powder carries out sonic oscillation processing, ball milling, obtains doped alloys powder, is granulated by mist projection granulating or plasma, obtains the alloy nodularization powder of micron-level particle size；The sputtering of W/Mo coating is carried out on alloy nodularization powder, temperature, time and the power of control W/Mo sputtering prepare the alloying pellet that coating layer thickness is micron-sized W/Mo layers package；The alloying pellet wrapped up W/Mo layers carries out die mould, and alloy green compact is made；The thermally conductive fuel ball of alloy is made after sintering.The high thermal conductivity fuel ball heat transfer efficiency of this method preparation can be improved between 15-25%, better than the performance of the current doping thermally conductive pellet of nuclear fuel.This method is applicable in mass production, can be used for large-scale production.
Description
Technical field
The present invention relates to the preparation method of presurized water reactor fuel ball, especially a kind of preparation of high thermal conductivity fuel ball
Method.
Background technique
Presurized water reactor fuel ball core component is uranium dioxide, and uranium dioxide releases big calorimetric in fission process, is led to
It crosses cladding tubes to conduct to external fluid, realizes heat transmission and utilization.But uranium dioxide heating conduction itself is poor, is unfavorable for heat
Amount conduction causes fuel pellet cross-sectional edge to center to generate very high temperature gradient, even results in fuel ball
Structural failure.For this purpose, needing to improve the thermally conductive effect of fuel slug while the fission speed for controlling uranium dioxide in practice
Rate.At present improve fuel pellet heating conduction a main path, be exactly by addition high thermal conductivity substance such as tungsten,
Molybdenum, SiC and diamond etc..Preparation process mainly passes through the completion of the processes such as powder mixing-die mould-sintering.Pass through this preparation
Alloy in, most doped chemical disperses or be solid-solubilized in uranium dioxide matrix, a small amount of doped chemical is distributed in crystal boundary.Crystal grain
Internal doped chemical facilitates thermally conductive in crystal grain, and grain boundaries doped chemical facilitates intercrystalline heat transmission.However crystal boundary
The high thermal conductivity doped chemical of place's point type distribution affects fuel pellet heating conduction because being not carried out effective connection
It is obviously improved.Further, since in existing uranium dioxide alloy fuel pellet preparation method, the granularity of powder used be essentially by
Screening mode is selected and is controlled.Therefore, powder size wider distribution, the micros such as sintering temperature, pressure, activity are simultaneously in addition
It is not exclusively different, therefore the controllability of pellet crystal particle scale is poor, and then causes the microcosmic crystal particle scale difference of fuel pellet larger.
Simultaneously as the distribution of the high conduction material on crystal boundary such as grain boundaries high thermal conductivity element W/Mo/SiC/ diamond has randomness,
It can not effective connection.Therefore, the heating conduction of existing uranium dioxide pellet is unsatisfactory.
Summary of the invention
To solve drawbacks described above existing in the prior art, the purpose of the present invention is to provide a kind of high thermal conductivity nuclear fuel cores
The preparation method of block focuses on the basis of continuing to optimize the density and fission heating strength of uranium dioxide alloy fuel pellet
In fuel pellet ingredient and microstructure design.On the one hand alloy pellet crystal grain energy is improved by high thermal conductivity element doping mode
Heat-transfer capability, on the other hand realize the connection in grain boundaries high thermal conductivity channel by powder inclusion enclave mode, reduce crystal boundary thermal resistance,
Efficiency of thermal transfer is improved, and then guarantees that the whole of fuel pellet heating conduction is promoted.
The present invention is realized by following technical proposals.
A kind of preparation method of high thermal conductivity fuel ball provided by the invention, includes the following steps:
1) alloy powder adulterates
Be (1~2) according to mass ratio: (18~25) are by one of W/Mo/ diamond/SiC and UO2Powder is put into dispersion
Sonic oscillation is handled in medium, and then by treated, mixed slurry carries out ball milling, the alloy powder of doping is made in drying；
2) it is granulated
According to solid-to-liquid ratio (65~70): alloy powder is mixed with polyvinyl alcohol water solution, is stirred by (30~35), passes through control
The revolving speed and disengaging air temperature pairing bronze end mixed liquor of centrifugal spraying granulator processed are granulated, or above-mentioned alloy powder is led to
Plasma granulation is crossed, the alloy nodularization powder of micron-level particle size is made；
3) vacuum magnetic-control sputtering
W/Mo coating magnetron sputtering is carried out on alloy nodularization powder, the vacuum of the magnetron sputtering by controlling W/Mo coating
Degree, temperature, time and power prepare the alloying pellet that coating layer thickness is micron-sized W/Mo layers package；
4) die mould
The alloying pellet wrapped up W/Mo layers carries out die mould, and alloy green compact is made；
5) it is sintered and high thermal conductivity fuel ball is made
Alloy green compact obtained is sintered in resistance furnace and under protective atmosphere, by control sintering temperature and when
Between, the thermally conductive fuel ball of alloy is made.
For above-mentioned technical proposal, there are also further preferred schemes by the present invention:
Optionally, in the step 1), one of W/Mo/ diamond/SiC and UO2Powder is put into decentralized medium
Sonic oscillation handles 3~5h in batch mixer, and then treated mixed slurry is added according to the ratio that ratio of grinding media to material is 3~5:1
ZrO2Abrading-ball, 4~10h of ball milling under 300~500r/min speed conditions.
Optionally, the decentralized medium is dimethylbenzene or ethyl alcohol.
Optionally, in the step 2), the concentration of polyvinyl alcohol water solution is 2~5%, by polyvinyl alcohol water solution 80
It is dissolved by heating in DEG C water-bath below.
Optionally, in the step 2), the revolving speed of mist projection granulating centrifugal energy nozzle is 1200~1600r/min, inlet air temperature
It is 200~260 DEG C, leaving air temp is 130~150 DEG C, and partial size D is made50For 64~80 μm of alloy nodularization powder.
Optionally, mode is granulated using the plasma to be granulated alloy powder, plasma beam temperature is adjusted 12000
~16000 DEG C, powder feeder feeding speed is 20~100g/min.
Optionally, in the step 3), the vacuum degree of magnetron sputtering is 100~300pa, and temperature is 120~300 DEG C, is splashed
Penetrating the time is 3~4h, and power is 4~8kw, prepares the W/Mo coating that coating layer thickness is 5~35 microns.
Optionally, in the step 4), die mould pressure is 200~450MPa, and the pressing time is≤40min.
Optionally, in the step 5), alloy green compact is 95%Ar+5%H in resistance furnace protective atmosphere2Middle sintering, sintering
Temperature is 1700~1800 DEG C, and sintering time is 2~4h.
The preparation method of high-efficiency heat conduction fuel ball of the invention, has the advantages that
1) it is prepared with ingredient and crystal particle scale requirement by spraying or plasma mode by fuel ball master
UO2The prilling powders such as+W/Mo/SiC/ diamond realize UO2The nodularization of the alloy powders such as+W/Mo/SiC/ diamond and granularity scale
It is effective controllable；
2) by cryogenic vacuum magnetron sputtering technique, the high-thermal conductive metals such as surface sputtering tungsten/molybdenum is carried out to prilling powder and are applied
Layer is formed " with W/Mo in UO2The microcosmic inclusion texture of the alloys nodularization such as+Wo/Mo/SiC/ diamond particle surface "；
3) by being granulated the regular prilling powder controlled with good fluidity and scale, powder compact three-dimensional matter is realized
The uniformity controlling of amount guarantees green compact micro-quality uniformity；
4) during the sintering process, with the elimination in gap between the contraction of powder particle size and adjacent powder, adjacent powder
Phase counterdiffusion and densification between last tungsten coating form the tungsten/molybdenum passage of heat continuously densified.
The present invention is not changing UO2On the basis of the alloys main component such as+W/Mo/SiC/ diamond, according to uranium dioxide
With the difference of doped chemical function and performance characteristics in heat production and diabatic process, i.e. the heat production function and W/Mo/ of uranium dioxide
The thermally conductive function of the alloying elements such as SiC/ diamond.It is controlled by the scale uniformity of microcosmic crystal grain, balanced crystal grain exothermicity；
Meanwhile being designed by the structure of microcosmic crystal boundary, it forms heat-conducting layer W/Mo and wraps up heat generating body UO2The alloys such as+W/Mo/SiC/ diamond
Microcosmic grain structure form that space three-dimensional cubic network is thermally conductive and support knot so that microcosmic grain structure is connected with each other according to this
Structure realizes the optimization of heat production material function and the structure-reinforced unification of Heat Conduction Material.It i.e. on the one hand can be in moderate reduction crystal grain
UO2W/Mo/SiC/ diamond equal size in alloy improves fission calorific intensity；On the other hand pass through the effective connection of grain boundaries tungsten,
Significantly improve the heating conduction of fuel pellet.15- can be improved in the high thermal conductivity fuel ball heat transfer efficiency of this method preparation
Between 25%, better than the performance of the thermally conductive pellet of uranium dioxide of current other methods preparation.This method is applicable in mass production, can
To be used for large-scale production.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Inappropriate limitation of the present invention is constituted, in the accompanying drawings:
Fig. 1 is the method for the present invention flow diagram.
Specific embodiment
Below in conjunction with attached drawing and specific embodiment, the present invention will be described in detail, herein illustrative examples of the invention
And explanation is used to explain the present invention, but not as a limitation of the invention.
As shown in Figure 1, a kind of preparation method of high thermal conductivity fuel ball of the invention, includes the following steps:
(1) alloy powder adulterates
Be (1~2) according to mass ratio: (18~25) are by one of W/Mo/ diamond/SiC and UO2Powder is put into dispersion
Sonic oscillation handles 3~5h in medium dimethylbenzene or ethyl alcohol, according to ratio of grinding media to material is then 3~5:1 by treated mixed slurry
Ratio be added ZrO2Abrading-ball, 4~10h of vacuum abrading-ball mixing under 300~500r/min speed conditions；Then by treated
Mixed slurry carries out drying the alloy powder that doping is made.
(2) centrifugal spray granulation spheroidising
Mist projection granulating mode: alloy powder is granulated by sponging granulator, according to solid-to-liquid ratio (65~70): (30
~35) adding alloy powder in concentration is the side Bian Tianjia stirring in 2~5% polyvinyl alcohol water solutions, polyvinyl alcohol water solution
Temperature is controlled by water-bath at≤80 DEG C；Form the slurry that solid-to-liquid ratio is 65~70%.Control the air inlet of centrifugal spraying granulator
Temperature is 200~260 DEG C, and leaving air temp is 130~150 DEG C, and centrifugal energy nozzle revolving speed is 12000~16000r/min.
In another embodiment of the present invention, mode is granulated using plasma beam, the adjustment of plasma beam temperature is existed
12000~16000 DEG C, powder feeder feeding speed is 20~100g/min.
Prilling powder granularity is generally at 50-80 μm or so.
(3) vacuum magnetic-control sputtering is handled
Nodularization alloy powder is put into progress W/Mo coating magnetron sputtering in vacuum sputtering furnace chamber, controls the magnetic of W/Mo coating
The vacuum degree of control sputtering is 100~300pa, and temperature is 120~300 DEG C, 3~4h of time, and power is 4~8kw, and splash coating is thick
5~35 μm of degree.
(4) die mould and sintering
Above-mentioned powder is molded in tablet press machine/tetra- column press/isostatic cool pressing.Pressing pressure be 200~
450Mpa, pressing time are≤40min.It is then placed in 95%Ar+5%H2In sintering furnace, 1700~1800 DEG C of sintering temperature, burn
The knot time is 2~4h, and the thermally conductive fuel ball of alloy is made.
Specific embodiment is given below, and the present invention is further described.
Embodiment 1
By the proportioned Nano diamond powder of 1:19 and UO2Powder is put into decentralized medium (dimethylbenzene) at sonic oscillation
Manage 3h.Then by treated, mixed slurry is transferred in agate pot, and ZrO is added2Abrading-ball, ratio of grinding media to material 5:1, then recycles planet
Formula ball mill carries out ball mill mixing, then revolving speed 300r/min, Ball-milling Time 4h dry the uranium dioxide that doped diamond is made
Alloy powder.Secondly according to solid-to-liquid ratio 70%, the alloy powder prepared is put into the molten of the 2%PVA that bath temperature is 70 DEG C
40min is stirred in liquid；Then, it is granulated by centrifugal spraying granulator.The revolving speed of centrifugal energy nozzle is 12000r/min, inlet air temperature
It is 220 DEG C, leaving air temp is 135 DEG C, and partial size D is made50For 65 μm of alloy nodularization powder.Molybdenum coating magnetron sputtering is carried out again, very
Reciprocal of duty cycle is 120pa, and temperature is 160 DEG C, sputtering time 1.5h, power 4kw, prepares the molybdenum that coating layer thickness is 15.6 μm and applies
Layer.Uranium dioxide alloy powder die mould on tablet press machine is wrapped up to molybdenum, pressure 450MPa, pressing time 0.5min are made
Alloy green compact.Finally resistance furnace and have argon gas and hydrogen mixed gas atmosphere protection in be sintered, technique be 1750 DEG C × 3h, be made close
Golden pellet.Measure alloy thermal coefficient.
Final to obtain high thermal conductivity nuclear fuel alloy exemplar, the thermal conductivity of measured exemplar is 6.63W/ (mK).And it is same
Sample condition of molding prepares non-impurity-doped UO2The room temperature thermal conductivity of pellet style is 5.62W/ (mK), improves 17.9% on year-on-year basis.
Embodiment 2
By the proportioned Nano diamond powder of 1:20 and UO2Powder is put into decentralized medium (dimethylbenzene) at sonic oscillation
Manage 4h.Then ZrO is added according to ratio of grinding media to material 5:1 ratio2Abrading-ball is put into togerther ball mill mixing in planetary ball mill.Ball mill
Then revolving speed 350r/min, Ball-milling Time 5h dry the UO that doped diamond is made2Alloyed powder.Secondly according to solid-to-liquid ratio 65%,
The alloy powder prepared is put into the 2.5%PVA aqueous solution that bath temperature is 60 DEG C and stirs 30min；Then, pass through centrifugation
Sponging granulator is granulated.The revolving speed of centrifugal energy nozzle is 12500r/min, and inlet air temperature is 200 DEG C, and leaving air temp is 150 DEG C, system
Obtain partial size D50For 72 μm of alloy nodularization powder.Again by magnetron sputtering molybdenum coating, temperature is 120 DEG C, and vacuum degree 180pa splashes
Penetrating the time is 4h, and power 5kw, the molybdenum coating prepared is with a thickness of 27.3 μm.Then by four-column press die mould, pressure is
Alloy green compact is made in 400MPa, pressing time 2min.Finally in resistance furnace and 95%Ar+5%H2Middle sintering, technique are
1700 DEG C × 4h, alloy pellet is made.Measure alloy thermal coefficient.
Final to obtain high thermal conductivity nuclear fuel alloy exemplar, the thermal conductivity of measured exemplar is 6.95W/ (mK).And it is same
Sample condition of molding prepares non-impurity-doped UO2The room temperature thermal conductivity of pellet style is 5.62W/ (mK), improves 23.6% on year-on-year basis.
Embodiment 3
By the proportioned sub-micron molybdenum powder of 2:23 and UO2Powder is put into decentralized medium (alcohol) and carries out at sonic oscillation
4h is managed, ZrO then is added according to ratio of grinding media to material 3:12Abrading-ball is put into togerther ball mill mixing in planetary ball mill, revolving speed 500r/
Then min, Ball-milling Time 3.5h dry the UO that doped molybdenum is made2Alloyed powder.Secondly it according to solid-to-liquid ratio 68%, will prepare
Alloy powder be put into bath temperature be 50 DEG C 3.2%PVA aqueous solution in stir 40min；Then, it is made by centrifugal spray
Grain machine is granulated.The revolving speed of mist projection granulating centrifugal energy nozzle is 13000r/min, and inlet air temperature is 260 DEG C, and leaving air temp is 130 DEG C,
Partial size D is made50For 64 μm of alloy nodularization powder.Again by magnetron sputtering molybdenum coating, vacuum degree 130pa, temperature is 300 DEG C,
Sputtering time is 1h, power 8kw, prepares molybdenum coating with a thickness of 23.2 μm.Then by isostatic pressing machine die mould, pressure is
Alloy green compact is made in 200MPa, pressing time 40min.Finally in resistance furnace and 95%Ar+5%H2Middle sintering, technique are
1750 DEG C × 3h, alloy pellet is made.Measure alloy thermal coefficient.
Final to obtain high thermal conductivity nuclear fuel alloy exemplar, the thermal conductivity of measured exemplar is 6.74W/ (mK).And it is same
Sample condition of molding prepares non-impurity-doped UO2The room temperature thermal conductivity of pellet style is 5.62W/ (mK), improves 19.93% on year-on-year basis.
Embodiment 4
By the proportioned Sub-micron Tungsten Powder end 2:25 and UO2Powder, which is put into decentralized medium (dimethylbenzene), carries out sonic oscillation
3h is handled, ZrO then is added according to ratio of grinding media to material 4:12Abrading-ball is put into togerther ball mill mixing in planetary ball mill.Ball mill turns
Then fast 300r/min, Ball-milling Time 6h are dried and UO are made2Alloyed powder.Then, by way of plasma beam granulation, will etc. from
For beamlet temperature at 12000 DEG C, powder feeder feeding speed is 60g/min, and partial size D is made50For 46 μm of alloy nodularization powder.Pass through again
Magnetron sputtering tungsten coating, vacuum degree 150pa, temperature are 200 DEG C, sputtering time 2h, power 5kw and prepare tungsten coating
With a thickness of 15 μm.Then by four-column press die mould, alloy green compact is made in pressure 350MPa, pressing time 1.0min.Most
Afterwards in resistance furnace and 95%Ar+5%H2It is sintered in atmosphere, technique is 1750 DEG C × 4h, and alloy pellet is made.It is thermally conductive to measure alloy
Coefficient.
Final to obtain high thermal conductivity nuclear fuel alloy exemplar, the thermal conductivity of measured exemplar is 6.57W/ (mK).And it is same
Sample condition of molding prepares non-impurity-doped UO2The room temperature thermal conductivity of pellet style is 5.62W/ (mK), improves 16.9% on year-on-year basis.
Embodiment 5
By the proportioned sub-micrometer SiC powder of 1:20 and UO2Powder, which is put into decentralized medium (alcohol), carries out sonic oscillation
5h is handled, ZrO then is added according to ratio of grinding media to material 5:12Abrading-ball is put into togerther ball mill mixing in planetary ball mill.Ball mill turns
Fast 500r/min, Ball-milling Time 6h, then the UO of doping SiC powder is made in drying2Alloyed powder.Then, it is granulated by plasma beam
Mode, by plasma beam temperature at 13000 DEG C, powder feeder feeding speed is 80g/min, and partial size D is made50For 42 μm of alloy nodularizations
Powder.Again by magnetron sputtering molybdenum coating, vacuum degree 160pa, temperature is 150 DEG C, sputtering time 3h, power 5kw, system
Standby molybdenum coating out is with a thickness of 25 μm.Then by waiting static pressure die mould, alloy is made in pressure 200MPa, pressing time 35min
Green compact.Finally in resistance furnace and 95%Ar+5%H2It is sintered in atmosphere, technique is 1700 DEG C × 3h, and alloy pellet is made.Measurement
Alloy thermal coefficient.
Final to obtain high thermal conductivity nuclear fuel alloy exemplar, the thermal conductivity of measured exemplar is 6.79W/ (mK).And it is same
Sample condition of molding prepares non-impurity-doped UO2The room temperature thermal conductivity of pellet style is 5.61W/ (mK), improves 20.8% on year-on-year basis.
Following table 1 gives chrome zirconium copper alloy high thermal conductivity fuel ball embodiment and existing core prepared by the method for the present invention
The comparison of fuel pellet heating conduction.
1 performance comparison of table
From above-mentioned UO2The comparison of fuel pellet heating conduction is as can be seen that the UO prepared through the method for the present invention2Fuel pellet is led
Electric rate is not less than 6.57W/ (mK), and pellet conductivity is up to 6.94W/ (mK), lifts up to 23% or more.To raising and combustion
Material pellet thermal efficiency and the stability for enhancing fuel ball play an important roll, therefore have a extensive future.
Claims (9)
1. a kind of preparation method of high thermal conductivity fuel ball, which comprises the steps of:
1) alloy powder adulterates
Be (1~2) according to mass ratio: (18~25) are by one of W/Mo/ diamond/SiC and UO2Powder is put into decentralized medium
Middle sonic oscillation processing, then by treated, mixed slurry carries out ball milling, the alloy powder of doping is made in drying；
2) it is granulated
According to solid-to-liquid ratio (65~70): alloy powder is mixed with polyvinyl alcohol water solution, is stirred by (30~35), by control from
The revolving speed and disengaging air temperature pairing bronze end mixed liquor of heart sponging granulator are granulated, or are granulated by plasma, are made
The alloy nodularization powder of micron-level particle size；
3) vacuum magnetic-control sputtering
W/Mo coating magnetron sputtering is carried out on alloy nodularization powder, by the magnetron sputtered vacuum degree, the temperature that control W/Mo coating
Degree, time and power prepare the alloy nodularization powder that coating layer thickness is micron-sized W/Mo layers package；
4) die mould
The alloying pellet wrapped up W/Mo layers carries out die mould, and alloy green compact is made；
5) it is sintered and high thermal conductivity fuel ball is made
Alloy green compact obtained is sintered in resistance furnace and under protective atmosphere, by controlling sintering temperature and time,
The thermally conductive fuel ball of alloy is made.
2. a kind of preparation method of high thermal conductivity fuel ball according to claim 1, which is characterized in that the step 1)
In, one of W/Mo/ diamond/SiC and UO2Powder is put into decentralized medium carries out sonic oscillation processing 3 in batch mixer
Then ZrO is added according to the ratio of 3~5:1 of ratio of grinding media to material in treated mixed slurry by~5h2Abrading-ball, in 300~500r/min
4~10h of ball milling under speed conditions.
3. a kind of preparation method of high thermal conductivity fuel ball according to claim 2, which is characterized in that the dispersion is situated between
Matter is dimethylbenzene or ethyl alcohol.
4. a kind of preparation method of high thermal conductivity fuel ball according to claim 1, which is characterized in that the step 2)
In, the concentration of polyvinyl alcohol water solution is 2~5%, and polyvinyl alcohol water solution is dissolved by heating in 80 DEG C of water-baths below.
5. a kind of preparation method of high thermal conductivity fuel ball according to claim 1, which is characterized in that the step 2)
In, the revolving speed of mist projection granulating centrifugal energy nozzle is 1200~1600r/min, and inlet air temperature is 200~260 DEG C, leaving air temp 130
~150 DEG C, partial size D is made50For 50~100 μm of alloy nodularization powder.
6. a kind of preparation method of high thermal conductivity fuel ball according to claim 5, which is characterized in that using described etc.
Ion is granulated mode and realizes alloy powder nodularization, and plasma beam temperature is 12000~16000 DEG C, and powder feeder feeding speed is 20
~100g/min.
7. a kind of preparation method of high thermal conductivity fuel ball according to claim 1, which is characterized in that the step 3)
In, the vacuum degree of magnetron sputtering is 100~300pa, and temperature is 120~300 DEG C, and sputtering time is 3~4h, power is 4~
8kw prepares the W/Mo coating that coating layer thickness is 5~35 microns.
8. a kind of preparation method of high thermal conductivity fuel ball according to claim 1, which is characterized in that the step 4)
In, die mould pressure is 200~450MPa, and the pressing time is≤40min.
9. a kind of preparation method of high thermal conductivity fuel ball according to claim 1, which is characterized in that the step 5)
In, alloy green compact is 95%Ar+5%H in resistance furnace protective atmosphere2It is sintered in mixed atmosphere, sintering temperature is 1700~1800
DEG C, sintering time is 2~4h.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110828001A (en) * | 2019-10-23 | 2020-02-21 | 中国工程物理研究院材料研究所 | Heat conductivity improved uranium dioxide-based fuel pellet for improving uranium loading and preparation method thereof |
| CN111014698A (en) * | 2019-12-17 | 2020-04-17 | 中核四0四有限公司 | Granulating method of MOX mixed powder |
| CN112355311A (en) * | 2020-10-21 | 2021-02-12 | 中国科学院合肥物质科学研究院 | Tungsten-based metal ceramic nuclear fuel pellet and preparation method thereof |
| CN113003609A (en) * | 2019-12-20 | 2021-06-22 | 中核北方核燃料元件有限公司 | Plasma spheroidizing process of uranium dioxide particles |
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| CN107871540A (en) * | 2017-10-27 | 2018-04-03 | 中国工程物理研究院材料研究所 | A kind of preparation method of big crystal grain high heat conductance uranium dioxide pellet |
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| CN110828001A (en) * | 2019-10-23 | 2020-02-21 | 中国工程物理研究院材料研究所 | Heat conductivity improved uranium dioxide-based fuel pellet for improving uranium loading and preparation method thereof |
| CN110828001B (en) * | 2019-10-23 | 2021-09-28 | 中国工程物理研究院材料研究所 | Heat conductivity improved uranium dioxide-based fuel pellet for improving uranium loading and preparation method thereof |
| CN111014698A (en) * | 2019-12-17 | 2020-04-17 | 中核四0四有限公司 | Granulating method of MOX mixed powder |
| CN113003609A (en) * | 2019-12-20 | 2021-06-22 | 中核北方核燃料元件有限公司 | Plasma spheroidizing process of uranium dioxide particles |
| CN112355311A (en) * | 2020-10-21 | 2021-02-12 | 中国科学院合肥物质科学研究院 | Tungsten-based metal ceramic nuclear fuel pellet and preparation method thereof |
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