CN109903869A - A kind of enhanced UO2The preparation method of fuel ball - Google Patents
A kind of enhanced UO2The preparation method of fuel ball Download PDFInfo
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- CN109903869A CN109903869A CN201910103423.9A CN201910103423A CN109903869A CN 109903869 A CN109903869 A CN 109903869A CN 201910103423 A CN201910103423 A CN 201910103423A CN 109903869 A CN109903869 A CN 109903869A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a kind of enhanced UO2The preparation method of fuel ball solves UO in the prior art2Thermal conductivity sharply declines fuel pellet at high temperature, and gas fission product takes the problem of ability weakens rapidly in.Preparation method of the invention is by the good UO of sphericity2After reinforced phase composite particles cold-press moulding, fuel ball biscuit is obtained, then the fuel ball biscuit high-temperature atmosphere sintering is subjected under reactive atmosphere, obtains enhanced UO2Fuel ball；The UO2Reinforced phase composite particles are by UO2Powder is made with reinforced phase, lubricant of raw material；The dosage of the reinforced phase is UO20.05~5wt.% of powder quality.The method of the present invention is simple, design science, enhanced UO2Fuel pellet thermal conductivity performance at high temperature and ability is taken in relative to existing UO to gas fission product2Fuel pellet will be substantially improved.
Description
Technical field
The invention belongs to nuclear fuel technical fields, and in particular to a kind of enhanced UO2The preparation method of fuel ball.
Background technique
Uranium dioxide (UO2) it is most widely used nuclear fuel material in current business nuclear reactor.UO2With a series of
The advantages of, for example, neutron fusing point is high, irradiation stability, capture cross-section is low, it is good to the corrosion resistance of coolant water, with involucrum
Material has good compatibility etc..However, the continuous improvement with nuclear industry to the security requirement of nuclear fuel system, high temperature
Thermal conductivity is low, and fission product, which takes the weak problem of ability in, becomes increasingly severe.Under the accident condition of coolant loss, tradition
UO2The thermal conductivity of fuel pellet will sharply fail, and pellet temperature increases rapidly, the temperature ladder of center line to fuel pellet surface
Degree constantly increases, and fission product burst size dramatically increases, and the high-temperature oxydation for also resulting in zircaloy fuel can and vapor is released
Hydrogen reaction aggravation.If the situation, which cannot be effectively relieved, will lead to fuel pellet craze and transfiguration, until melting down, constantly release is a large amount of
A large amount of hydrogen of fission product, cladding tube rupture, release explode at high temperature, and pressure vessel load constantly increases, until
It explodes because internal pressure is excessive, causes serious nuclear accident (R.O.Meyer, Nucl.Technol., 2006,155:293).
In order to effectively inhibit the generation of the above serious nuclear accident, it is necessary to improve the thermal conductivity of fuel pellet as far as possible and to fission product
Take ability in.The blocking of crystal boundary is limitation UO2One key factor of thermal conductivity.Studies have shown that at different temperatures, UO2Heat
The increase with crystallite dimension is presented and trend (Lihao Gea, Journal the ofthe European that rises in conductance
Ceramic Society,2014,34:1791).The result of study of Los Alamos National Laboratories, the U.S. shows UO2It is brilliant
It is different in the thermal conductivity of different orientation in body, and the presence of crystal boundary then can largely lead to the reduction of thermal conductivity.Therefore,
Prepare the UO of big crystal grain size2UO is improved as in addition to adding thermal conductivity reinforced phase2Another important means of nuclear fuel thermal conductivity
(K.Gofryk,Nature Communications,2014,5,4551).Meanwhile the increase of crystallite dimension can also be great
The fission gas inclusiveness for improving fuel can have important role to fuel safety is improved.
Therefore it provides a kind of enhanced UO2The preparation method of fuel ball, simple process is easy to operate, gained pellet
Crystal grain is big, and thermal conductivity is high, can effectively promote security performance, become those skilled in the art's urgent problem to be solved.
Summary of the invention
Technical problem solved by the present invention is providing a kind of enhanced UO2The preparation method of fuel ball solves existing
UO in technology2Thermal conductivity sharply declines fuel pellet at high temperature, and gas fission product takes the problem of ability weakens rapidly in.
The technical solution adopted by the invention is as follows:
A kind of enhanced UO of the present invention2The preparation method of fuel ball, by sphericity good (subsphaeroidal)
UO2After reinforced phase composite particles cold-press moulding, fuel ball biscuit is obtained, then the fuel ball biscuit exists
High-temperature atmosphere sintering is carried out under reactive atmosphere, obtains enhanced UO2Fuel ball；
The UO2Reinforced phase composite particles are by UO2Powder is made with reinforced phase, lubricant of raw material；The reinforced phase
Dosage be UO20.05~5wt.% of powder quality.
Further, specifically includes the following steps:
Step 1. is by the good UO of sphericity2Reinforced phase composite particles are fitted into powder metallurgy forming mold, are pressed into
Fuel ball biscuit；
Fuel ball biscuit made from step 1 is packed into atmosphere sintering furnace by step 2., is carried out under reactive atmosphere low
Warm degreasing and high temperature sintering obtain enhanced UO after cooling2Fuel pellet.
Further, in the step 1, the fuel ball biscuit density being pressed into is 5.0~7.0g/cm3。
Further, the reactive atmosphere be the atmosphere of pure hydrogen, hydrogen+0.2~8vol% argon gas gaseous mixture atmosphere,
Hydrogen+0.2~8vol% carbon dioxide mix gas atmosphere, hydrogen+0.2~8vol% nitrogen mixture atmosphere, hydrogen+
Any one in the atmosphere of 0.5~15vol% vapor gaseous mixture.
Further, in the step 2, skimming temp is 400~800 DEG C, and soaking time is 1~8 hour.
Further, in the step 2, sintering temperature is 1600~1800 DEG C, and soaking time is 0.5~6 hour.
Further, the good UO of sphericity2The preparation methods of reinforced phase composite particles the following steps are included:
Step A. is by UO2Powder and reinforced phase, mix lubricant are uniform, obtain UO2With the mix powder of reinforced phase；
Mixed-powder obtained by step A is suppressed resulting mixture preformed compact by step B., then the mixture preformed compact is broken,
Composite particles are obtained after sieving；
After composite particles made from step B are ground nodularization by step C., the good UO of sphericity is obtained2Reinforced phase is compound
Composition granule.
Further, in the step A, the dosage of the lubricant is UO20.05~0.8wt.% of powder quality；
The dosage of the reinforced phase is UO2When 0.05~2wt.% of powder quality, UO can be accelerated2Crystal boundary extension, promotes
UO2The growth of crystal grain；
The dosage of the reinforced phase is greater than UO2Powder quality 2wt.%, and be less than or equal to 5wt.% when, UO can be inhibited2Crystal boundary
Extension, the thermal conductivity of dispersion-strengtherning pellet.
Further, the UO2The partial size of powder is 50nm~500 μm；The reinforced phase is selected from TiC, VC, Cr3C2、
MoC、MoC2, any one or a few in ZrC；Any one of the lubricant in zinc stearate, Acrawax.
Further, the incorporation time in the step A is 6~24 hours；
Mix powder powder metallurgy pre-pressing die or cold isostatic press are under 50~600MPa pressure in the step B
Resulting mixture preformed compact is suppressed, the partial size of the composite particles is 20~200 mesh；
In the step C, grinding nodularization 1~12 hour will be carried out in the composite particles nodularization equipment.
Compared with prior art, the invention has the following advantages:
The method of the present invention is simple, design science, by UO2A small amount of reinforced phase is uniformly added in raw material, using granulation
The pellet biscuit of appropriate size and density is obtained with forming, high temperature sintering is finally carried out in activation phenomenon, obtains UO2Average crystalline substance
Particle size is noticeably greater than tradition UO2Fuel pellet, thermal conductivity are substantially better than traditional UO2The enhanced UO of fuel pellet2Pellet.
In the present invention, the dosage of reinforced phase is UO2When 0.05~2wt.% of powder quality, UO can be accelerated2Crystal boundary extension,
Promote UO2The growth of crystal grain obtains the pellet of big crystal grain.To improve the thermal conductivity of pellet, improve the fission gas packet of fuel
Capacitive
In the present invention, when the dosage of reinforced phase is 2-5wt.%, inhibit UO instead2The extension of crystal boundary.Reinforced phase at this time
The effect for primarily serving thermal conductivity reinforced phase dispersion-strengtherning improves the thermal conductivity of pellet by dispersion-strengtherning.
Titanium carbide (TiC), vanadium carbide (VC), chromium carbide (Cr3C2), molybdenum carbide (MoC, MoC2), zirconium carbide etc. be a kind of high
Warm structural stability and high temperature oxidation resistance are excellent, and thermal conductivity and hot expansibility are substantially better than UO2Material, be widely applied
In aerospace and weaponry field.Using above-mentioned carbide material is reinforced phase to UO2Pellet is doped modification, no
UO in pellet sintering process can only be effectively facilitated2The growth of crystal grain obtains the UO of big crystal grain size2Pellet, moreover it is possible to promote pellet
Thermal conductivity performance.Importantly, under high temperature environment, above-mentioned carbide material and UO2UOCization can be generated after reacting
Object is closed, UOC compound has excellent thermophysical property, this reaction is also by the further thermal conductivity performance for promoting pellet.On
The addition of carbide material is stated to UO2The high-temperature oxidation resistance of pellet will also have certain improvement.Currently, both at home and abroad about above-mentioned
Material reinforcement UO2The research contents of pellet there is no literature reported on.
Selected TiC, VC, Cr in the present invention3C2、MoC、MoC2, the reinforced phases such as ZrC be nuclear fuel industry universal national standard
In " GBT 10266-2008 be sintered uranium dioxide pellet technical conditions " regulation allow containing impurity element.Since the present invention adopts
UO is carried out with a variety of activation phenomenons2The high-temperature activation of pellet is sintered, and the additive amount of reinforced phase is relative to traditional argon hydrogen gaseous mixture
Sintering condition can be greatly reduced.The dosage of reinforced phase is UO in the present invention20.05~5wt.% of powder quality, through state's kernel
Electric enterprise calculation, which will not cause significantly to negatively affect to the comprehensive performance of pellet, while can greatly improve pellet pair
Fission product takes ability in, effectively improves the thermal conductivity performance of pellet, meets enhanced UO2The technical requirements of pellet.
The preparation process of needle of the present invention and existing UO2The technology of preparing of fuel pellet is not much different, obtained pellet product
On ingredient and outer dimension with existing UO2Fuel pellet is also almost consistent.However, enhanced UO2Fuel pellet is at high temperature
Thermal conductivity performance and ability is taken in relative to existing UO to gas fission product2Fuel pellet will be substantially improved.It therefore, can be with
Under the premise of maintaining pellet preparation process and comprehensive performance stability to greatest extent, fuel pellet is significantly improved in various accidents
Inherently safe performance under operating condition.
Detailed description of the invention
Attached drawing 1 is big crystal grain UO made from the method for the present invention2The erosion crystal boundary metallographic microscope photo of fuel ball.
Attached drawing 2 is high thermal conductivity UO made from the method for the present invention2The erosion crystal boundary metallographic microscope photo of fuel ball.
Attached drawing 3 is big crystal grain UO made from the method for the present invention2The erosion crystal boundary stereoscan photograph of fuel ball.
Attached drawing 4 is high thermal conductivity UO made from the method for the present invention2The erosion crystal boundary stereoscan photograph of fuel ball.
Specific embodiment
The invention will be further described with embodiment for explanation with reference to the accompanying drawing, and mode of the invention includes but not only limits
In following embodiment.
Embodiment 1
Present embodiments provide enhanced UO of the invention2The preparation method of fuel ball, specifically:
By the UO of partial size 50nm2The lubricant stearic acid zinc of the reinforced phase TiC, 0.05wt.% of powder and 0.05wt.% into
Row mixing 24 hours, obtains UO2With the mix powder of TiC.It is pushed with powder metallurgy pre-pressing die in 400MPa pressure
UO is made2- TiC mixture preformed compact.The preformed compact is obtained into the UO of 200 mesh of partial size after broken, sieving2- TiC composite particles.
The composite particles are fitted into nodularization equipment and carry out grinding nodularization 8 hours, obtain the good UO of sphericity2- TiC compound
Grain.
By the UO after nodularization2- TiC composite particles are fitted into powder metallurgy forming mold, are pressed into density 5.8g/cm3's
Fuel ball biscuit.Obtained fuel ball biscuit is packed into atmosphere sintering furnace, it is mixed in hydrogen+2vol% carbon dioxide
It closes and carries out low-temperature defatted and high temperature sintering under the atmosphere of gas, 600 DEG C of skimming temp, soaking time 2 hours, sintering temperature 1600
DEG C, soaking time 6 hours, UO was obtained after cooling2The enhanced UO of the TiC that 76 μm of average grain size2Fuel pellet.
Enhanced UO made from the present embodiment2The metallographic microscope photo (corroding crystal boundary) of fuel ball is such as 1 institute of attached drawing
Show, stereoscan photograph (corroding crystal boundary) is as shown in Fig. 3.
Embodiment 2
Present embodiments provide enhanced UO of the invention2The preparation method of fuel ball, specifically:
By 5 μm of UO of partial size2The lubricant Acrawax of the reinforced phase VC, 0.2wt.% of powder and 1.5wt.% are mixed
18 hours, obtain UO2With the mix powder of VC.It is pressed into UO under 500MPa pressure with cold isostatic press2- VC mixing
Object preformed compact.The preformed compact is obtained into the UO of 100 mesh of partial size after broken, sieving2- VC composite particles.The composite particles are filled
Enter and carry out grinding nodularization 12 hours in nodularization equipment, obtains the good UO of sphericity2- VC composite particles.
By the UO after nodularization2- VC composite particles are fitted into powder metallurgy forming mold, are pressed into density 6.5g/cm3's
Fuel ball biscuit.Obtained fuel ball biscuit is packed into atmosphere sintering furnace, it is mixed in hydrogen+0.5vol% vapor
It closes and carries out low-temperature defatted and high temperature sintering under the atmosphere of gas, 500 DEG C of skimming temp, soaking time 3 hours, sintering temperature 1750
DEG C, soaking time 2 hours, UO was obtained after cooling2The enhanced UO of the VC that 83 μm of average grain size2Fuel pellet.
Embodiment 3
Present embodiments provide enhanced UO of the invention2The preparation method of fuel ball, specifically:
By 500 μm of UO of partial size2The reinforced phase Cr of powder and 0.5wt.%3C2, the lubricant Acrawax progress of 0.5wt.%
Mixing 6 hours, obtains UO2With Cr3C2Mix powder.It is pressed under 50MPa pressure with powder metallurgy pre-pressing die
UO2-Cr3C2Mixture preformed compact.The preformed compact is obtained into the UO of 20 mesh of partial size after broken, sieving2-Cr3C2Composite particles.It will
The composite particles, which are fitted into nodularization equipment, carries out grinding nodularization 1 hour, obtains the good UO of sphericity2-Cr3C2Composite particles.
By the UO after nodularization2-Cr3C2Composite particles are fitted into powder metallurgy forming mold, are pressed into density 5.0g/cm3
Fuel ball biscuit.Obtained fuel ball biscuit is packed into atmosphere sintering furnace, is carried out under the atmosphere of pure hydrogen
Low-temperature defatted and high temperature sintering, 400 DEG C of skimming temp, soaking time 8 hours, 1800 DEG C of sintering temperature, soaking time 0.5 was small
When, UO is obtained after cooling2The Cr that 71 μm of average grain size3C2Enhanced UO2Fuel pellet.
Embodiment 4
Present embodiments provide enhanced UO of the invention2The preparation method of fuel ball, specifically:
By 100 μm of UO of partial size2The lubricant Acrawax of the reinforced phase MoC, 0.5wt.% of powder and 1wt.% are mixed
It closes 12 hours, obtains UO2With the mix powder of MoC.It is pressed into UO under 600MPa pressure with cold isostatic press2-MoC
Mixture preformed compact.The preformed compact is obtained into the UO of 80 mesh of partial size after broken, sieving2- MoC composite particles.By this compound
Grain, which is fitted into nodularization equipment, carries out grinding nodularization 6 hours, obtains the good UO of sphericity2- MoC composite particles.
By the UO after nodularization2- MoC composite particles are fitted into powder metallurgy forming mold, are pressed into density 6.5g/cm3's
Fuel ball biscuit.Obtained fuel ball biscuit is packed into atmosphere sintering furnace, is mixed in hydrogen+6vol% vapor
Carry out low-temperature defatted and high temperature sintering under the atmosphere of gas, 500 DEG C of skimming temp, soaking time 2 hours, 1700 DEG C of sintering temperature,
Soaking time 4 hours, UO was obtained after cooling2The enhanced UO of the MoC that 86 μm of average grain size2Fuel pellet.
Embodiment 5
Present embodiments provide enhanced UO of the invention2The preparation method of fuel ball, specifically:
By 20 μm of UO of partial size2The reinforced phase MoC of powder and 5wt.%2, the lubricant stearic acid zinc of 0.8wt.% mixed
It closes 16 hours, obtains UO2With MoC2Mix powder.It is pressed under 200MPa pressure with powder metallurgy pre-pressing die
UO2-MoC2Mixture preformed compact.The preformed compact is obtained into the UO of 600 mesh of partial size after broken, sieving2-MoC2Composite particles.It will
The composite particles, which are fitted into nodularization equipment, carries out grinding nodularization 5 hours, obtains the good UO of sphericity2-MoC2Composite particles.
By the UO after nodularization2-MoC2Composite particles are fitted into powder metallurgy forming mold, are pressed into density 7.0g/cm3
Fuel ball biscuit.Obtained fuel ball biscuit is packed into atmosphere sintering furnace, in hydrogen+15vol% vapor
Carry out low-temperature defatted and high temperature sintering under the atmosphere of gaseous mixture, 800 DEG C of skimming temp, soaking time 1 hour, sintering temperature 1720
DEG C, soaking time 3 hours, thermal conductivity was obtained after cooling and reaches 15Wm-1·k-1MoC2Enhanced UO2Fuel pellet.
Enhanced UO made from the present embodiment2The metallographic microscope photo (corroding crystal boundary) of fuel ball is such as 2 institute of attached drawing
Show, stereoscan photograph (corroding crystal boundary) is as shown in Fig. 4.
Embodiment 6
Present embodiments provide enhanced UO of the invention2The preparation method of fuel ball, specifically:
By the UO of partial size 300nm2The lubricant Acrawax of the reinforced phase ZrC, 0.08wt.% of powder and 1.5wt.% carry out
Mixing 24 hours, obtains UO2With the mix powder of ZrC.It is suppressed under 400MPa pressure with powder metallurgy pre-pressing die
At UO2- ZrC mixture preformed compact.The preformed compact is obtained into the UO of 50 mesh of partial size after broken, sieving2- ZrC composite particles.It will
The composite particles, which are fitted into nodularization equipment, carries out grinding nodularization 8 hours, obtains the good UO of sphericity2- ZrC composite particles.
By the UO after nodularization2- ZrC composite particles are fitted into powder metallurgy forming mold, are pressed into density 6.2g/cm3's
Fuel ball biscuit.Obtained fuel ball biscuit is packed into atmosphere sintering furnace, in hydrogen+0.2vol% carbon dioxide
Carry out low-temperature defatted and high temperature sintering under the atmosphere of gaseous mixture, 500 DEG C of skimming temp, soaking time 1 hour, sintering temperature 1750
DEG C, soaking time 6 hours, UO was obtained after cooling2The enhanced UO of the ZrC that 85 μm of average grain size2Fuel pellet.
Embodiment 7
Present embodiments provide enhanced UO of the invention2The preparation method of fuel ball, specifically:
By 20 μm of UO of partial size2The lubricant stearic acid zinc of the reinforced phase VC, 0.5wt.% of powder and 0.8wt.% carry out
Mixing 18 hours, obtains UO2With the mix powder of VC.It is pressed into UO under 600MPa pressure with cold isostatic press2-VC
Mixture preformed compact.The preformed compact is obtained into the UO of 150 mesh of partial size after broken, sieving2- VC composite particles.By this compound
Grain, which is fitted into nodularization equipment, carries out grinding nodularization 12 hours, obtains the good UO of sphericity2- VC composite particles.
By the UO after nodularization2- VC composite particles are fitted into powder metallurgy forming mold, are pressed into density 6.2g/cm3's
Fuel ball biscuit.Obtained fuel ball biscuit is packed into atmosphere sintering furnace, it is mixed in hydrogen+8vol% carbon dioxide
It closes and carries out low-temperature defatted and high temperature sintering under the atmosphere of gas, 600 DEG C of skimming temp, soaking time 8 hours, sintering temperature 1780
DEG C, soaking time 4 hours, UO was obtained after cooling2The enhanced UO of the VC that 79 μm of average grain size2Fuel pellet.
Above-described embodiment is only one of the preferred embodiment of the present invention, should not be taken to limit protection model of the invention
It encloses, as long as that in body design thought of the invention and mentally makes has no the change of essential meaning or polishing, is solved
The technical issues of it is still consistent with the present invention, should all be included within protection scope of the present invention.
Claims (10)
1. a kind of enhanced UO2The preparation method of fuel ball, which is characterized in that by the good UO of sphericity2Reinforced phase is multiple
After polymer beads cold-press moulding, obtain fuel ball biscuit, then by the fuel ball biscuit under reactive atmosphere into
The sintering of row high-temperature atmosphere, obtains enhanced UO2Fuel ball；
The UO2Reinforced phase composite particles are by UO2Powder is made with reinforced phase, lubricant of raw material；The use of the reinforced phase
Amount is UO20.05~5wt.% of powder quality.
2. a kind of enhanced UO according to claim 12The preparation method of fuel ball, which is characterized in that specifically include
Following steps:
Step 1. is by the good UO of sphericity2Reinforced phase composite particles are fitted into powder metallurgy forming mold, compacting nucleation combustion
Expect pellet biscuit；
Fuel ball biscuit made from step 1 is packed into atmosphere sintering furnace by step 2., and it is de- that low temperature is carried out under reactive atmosphere
Rouge and high temperature sintering obtain enhanced UO after cooling2Fuel pellet.
3. a kind of enhanced UO according to claim 22The preparation method of fuel ball, which is characterized in that the step
In 1, the fuel ball biscuit density being pressed into is 5.0~7.0g/cm3。
4. a kind of enhanced UO according to claim 32The preparation method of fuel ball, which is characterized in that the activity
Atmosphere is atmosphere, hydrogen+0.2~8vol% argon gas gaseous mixture atmosphere, hydrogen+0.2~8vol% carbon dioxide of pure hydrogen
The atmosphere of gaseous mixture, hydrogen+0.2~8vol% nitrogen mixture atmosphere, hydrogen+0.5~15vol% vapor gaseous mixture
Any one in atmosphere.
5. a kind of enhanced UO according to claim 42The preparation method of fuel ball, which is characterized in that the step
In 2, skimming temp is 400~800 DEG C, and soaking time is 1~8 hour.
6. a kind of enhanced UO according to claim 52The preparation method of fuel ball, which is characterized in that the step
In 2, sintering temperature is 1600~1800 DEG C, and soaking time is 0.5~6 hour.
7. a kind of enhanced UO described in -6 any one according to claim 12The preparation method of fuel ball, feature exist
In the good UO of sphericity2The preparation methods of reinforced phase composite particles the following steps are included:
Step A. is by UO2Powder and reinforced phase, mix lubricant are uniform, obtain UO2With the mix powder of reinforced phase；
Mixed-powder obtained by step A is suppressed resulting mixture preformed compact by step B., then the mixture preformed compact is broken, sieving
After obtain composite particles；
After composite particles made from step B are ground nodularization by step C., the good UO of sphericity is obtained2Reinforced phase compound
Grain.
8. a kind of enhanced UO according to claim 72The preparation method of fuel ball, which is characterized in that the step
In A, the dosage of the lubricant is UO20.05~0.8wt.% of powder quality；
The dosage of the reinforced phase is UO2When 0.05~2wt.% of powder quality, UO can be accelerated2Crystal boundary extension, promotes UO2It is brilliant
The growth of grain；
The dosage of the reinforced phase is greater than UO2Powder quality 2wt.%, and be less than or equal to 5wt.% when, UO can be inhibited2The expansion of crystal boundary
Exhibition, the thermal conductivity of dispersion-strengtherning pellet.
9. a kind of enhanced UO according to claim 82The preparation method of fuel ball, which is characterized in that the UO2
The partial size of powder is 50nm~500 μm；The reinforced phase is selected from TiC, VC, Cr3C2、MoC、MoC2, in ZrC any one or
It is several；Any one of the lubricant in zinc stearate, Acrawax.
10. a kind of enhanced UO according to claim 92The preparation method of fuel ball, which is characterized in that the step
Incorporation time in rapid A is 6~24 hours；
Mix powder powder metallurgy pre-pressing die or cold isostatic press are suppressed under 50~600MPa pressure in the step B
Resulting mixture preformed compact, the partial size of the composite particles are 20~200 mesh；In the step C, the composite particles nodularization is set
Grinding nodularization 1~12 hour is carried out in standby.
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| CN110164574A (en) * | 2019-07-02 | 2019-08-23 | 中国原子能科学研究院 | A kind of preparation method of cellular fuel pellet |
| CN111145926A (en) * | 2019-10-23 | 2020-05-12 | 中国工程物理研究院材料研究所 | Uranium dioxide-based fuel pellet with adjustable thermal expansion coefficient and enhanced thermal conductivity and preparation method thereof |
| CN112820432A (en) * | 2020-12-31 | 2021-05-18 | 中核北方核燃料元件有限公司 | Preparation process of molybdenum-based dispersion fuel core blank |
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