CN108335769A - A kind of preparation method and products thereof of reticular structure uranium dioxide/compound fuel ball of molybdenum - Google Patents
A kind of preparation method and products thereof of reticular structure uranium dioxide/compound fuel ball of molybdenum Download PDFInfo
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- CN108335769A CN108335769A CN201810139394.7A CN201810139394A CN108335769A CN 108335769 A CN108335769 A CN 108335769A CN 201810139394 A CN201810139394 A CN 201810139394A CN 108335769 A CN108335769 A CN 108335769A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
- G21C21/02—Manufacture of fuel elements or breeder elements contained in non-active casings
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/42—Selection of substances for use as reactor fuel
- G21C3/58—Solid reactor fuel Pellets made of fissile material
- G21C3/62—Ceramic fuel
- G21C3/623—Oxide fuels
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/42—Selection of substances for use as reactor fuel
- G21C3/58—Solid reactor fuel Pellets made of fissile material
- G21C3/62—Ceramic fuel
- G21C3/626—Coated fuel particles
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses a kind of preparation methods and products thereof of reticular structure uranium dioxide/compound fuel ball of molybdenum, it is therefore intended that solves the deficiency that current uranium dioxide withholds performance as heat conductivility existing for light water reactor nuclear fuel, fission product.The present invention, using low energy ball mill powder mixing method, changes distribution of the molybdenum powder in uranium dioxide matrix by uranium dioxide raw material powder modification, obtaining the subsphaeroidal rare earth element of large scale, and add the tiny molybdenum powder that core is had excellent performance；During being somebody's turn to do, tiny molybdenum powder uniform adhesion forms molybdenum powder and coats rare earth element, and uranium dioxide still keeps original size and shape in rare earth element surface；Finally, applying charge plasma sintering one-step shaping technology, the passage of heat micro-structure that " continuous net-shaped " molybdenum is formed around uranium dioxide crystal grain significantly improves the thermophysical property of uranium dioxide, while the performance withheld in the fission product of enhancing uranium dioxide to a certain degree.
Description
Technical field
The present invention relates to material and energy field, especially powdered metallurgical material field, a kind of specially reticular structure two
The preparation method and products thereof of the compound fuel ball of urania/molybdenum.More specifically the present invention provides a kind of reticular structure dioxy
Change the low-temperature rapid preparation method of the compound fuel ball of uranium/molybdenum, and the product prepared using this method.
Background technology
As " core " of nuclear power plant reactor, the performance of nuclear fuel element and material reflects the safety of nuclear energy, warp
Ji property and advance.In the development course in more than 50 years of nuclear reactor, uranium dioxide nuclear fuel is due to fusing point height（2865
℃）, the thermal-neutron capture cross-section of non-fissile composite component oxygen it is low（＜ 0.0002b）, have in chemistry and configuration aspects higher
Irradiation stability, and be the widely applied nuclear fuel in light-water reactor station power station the advantages that manufacturing expense is relatively low.
However, the significant drawback of uranium dioxide nuclear fuel is that heat conductivility is poor（Room temperature and 1000 DEG C of thermal conductivities are respectively 7.5
W/m.K and 2.8 W/m.k）, only metallic uranium ten part.In March, 2011, Fukushima, Japan nuclear power plant accident, from safety
Property angle has highlighted the disadvantage of uranium dioxide nuclear fuel lower thermal conductivity again.
Based on the low intrinsic thermal conductivity of uranium dioxide, when uranium dioxide fuel ball is on active service in heap, inside forms high
Radial symmetry gradient（2000~4000℃/cm）, generate larger thermal stress and crackle；Under high burnup, easily increase fission gas
Rate of release, and high central temperature can accelerate fission gas to discharge, and bubble is formed, lead to fuel void swelling, limits
The service efficiency of uranium dioxide nuclear fuel and service life.Meanwhile the heat conductivility that uranium dioxide is poor, it also reduces fuel pellet and arrives
Energy delivery efficiency between coolant.Thus, it is possible to think, the thermal conductivity of uranium dioxide nuclear fuel is directly linked the peace of nuclear power station
Full property and economy.
In this regard, for the intrinsic safety for promoting under economy and accident of the nuclear reactor under normality operating mode, there is an urgent need to
A kind of raising uranium dioxide nuclear fuel heat conductivility is developed, the method that fission product withholds performance, to solve the above problems.
Invention content
The goal of the invention of the present invention is：For current uranium dioxide as heat conductivility existing for light water reactor nuclear fuel,
Fission product withholds the deficiency of performance, provide a kind of reticular structure uranium dioxide/compound fuel ball of molybdenum preparation method and
Its product.The present invention is by uranium dioxide raw material powder modification, obtaining the subsphaeroidal rare earth element of large scale, and add
Add the tiny molybdenum powder that core is had excellent performance, using low energy ball mill powder mixing method, changes distribution of the molybdenum powder in uranium dioxide matrix
State；During being somebody's turn to do, tiny molybdenum powder uniform adhesion forms molybdenum powder and coats rare earth element in rare earth element surface, and
Uranium dioxide still keeps original size and shape；Finally, applying charge plasma sintering one-step shaping technology, in titanium dioxide
The passage of heat micro-structure of " continuous net-shaped " molybdenum is formed around uranium crystal grain, this micro-structure significantly improves the thermal conductivity of uranium dioxide
It can and enhance the ability that uranium dioxide withholds fission product；Meanwhile the addition of molybdenum reduces uranium dioxide to a certain extent
Linear expansion coefficient, can effectively postpone air gap closing time, the mechanics of fuel and involucrum is delayed to interact, further be promoted anti-
The safety under accident conditions should be piled up.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of preparation method of reticular structure uranium dioxide/compound fuel ball of molybdenum, includes the following steps：
（1）Uranium dioxide raw material powder is cold-pressed preform
Uranium dioxide raw material powder is fitted into mold, cold pressing preform is carried out, uranium dioxide blank is made in demoulding；
（2）Grinding is broken
Uranium dioxide blank prepared by step 1 is ground to broken, to be roughened uranium dioxide particle；
（3）Self-grind nodularization
The uranium dioxide particle of the roughening of step 2 is put into ball mill, self-grind nodularization is carried out, obtains rare earth element；
（4）Powder coats
By step（3）The rare earth element of preparation, molybdenum powder are filled with inert gas shielding by being put into ball mill, carry out low
Powder can be mixed, during low energy mixes powder, molybdenum powder is adhered to rare earth element surface, forms molybdenum powder and coats rare earth element；
（5）Discharge plasma is sintered one-step shaping
By step（4）The molybdenum powder cladding rare earth element powder of preparation is fitted into graphite jig, carries out discharge plasma burning
Form type；
（6）Demoulding is handled
By step（5）After the uranium dioxide material of discharge plasma sinter molding is demoulded, you can；
The step（4）In, rare earth element, molybdenum powder volume ratio be（80-98）：（2-20）.
In the step 1, it is 100MPa~600MPa, dwell time 0.5min~20min to be cold-pressed preformed pressure.
In the step 1, uranium dioxide raw material powder is fitted into sintered-carbide die, carries out cold pressing preform, demoulding, system
Obtain uranium dioxide blank.
In the step 2, it is the mesh of 10 mesh ~ 180 to grind broken uranium dioxide particle and cross metallic sieve size.
It grinds and is crushed in the step 2, in uranium dioxide blank agate Yan Portland prepared by step 1, cross different meshes
The metallic sieve of range, the uranium dioxide particle being roughened.
In the step 3, drum's speed of rotation be 150r/min ~ 350r/min, the nodularization time be 4 ~ for 24 hours, be not added in the process
Enter any abrasive media and abrading-ball.
In the step 3, the uranium dioxide particle of roughening prepared by step 2 is fitted into nylon tank, any grinding is not added with
Medium and abrading-ball carry out self-grind nodularization on horizontal ball mill, cross metallic sieve, obtain rare earth element.
In the step 4, the particle size range of molybdenum powder is 0.08 μm ~ 15 μm, rare earth element, molybdenum powder volume ratio be
（80-98）：（2-20）, drum's speed of rotation is 80r/min ~ 250r/min, and the powder mixing cladding time is 0.5h ~ 10h, is not added with and appoints
What abrasive media and abrading-ball.
In the step 4, by step（3）The rare earth element of preparation, tiny molybdenum powder are fitted into according to the ratio in nylon tank,
It is not added with any abrasive media and abrading-ball, and argon filling gas shielded, low energy ball mill is carried out on horizontal ball mill and mixes powder, in the process carefully
Small molybdenum powder is adhered to rare earth element surface, forms molybdenum powder and coats rare earth element.
In the step 5, the temperature of the in vitro sinter molding such as electric discharge is 1000 DEG C ~ 1650 DEG C, soaking time be 0.5min ~
30min, vacuum degree are 5 × 10-2Pa ~ 15Pa。
In the step 6, by step（5）The uranium dioxide material of discharge plasma sinter molding carries out at jacket removing
Reason, and it is machined the uranium dioxide pellet for required size.
Using the product prepared by aforementioned preparation process.
For foregoing problems, the present invention provides a kind of preparation side of reticular structure uranium dioxide/compound fuel ball of molybdenum
Method and products thereof.The preparation method includes the following steps：Uranium dioxide raw material powder is cold-pressed preform, grinding is crushed, self-grind ball
Change, powder cladding, discharge plasma are sintered one-step shaping etc..
In the present invention, uranium dioxide raw material powder is subjected to cold pressing preform first, cold pressing blank is ground in agate after demoulding
Be ground in Portland it is broken, cross different meshes range metallic sieve after, the uranium dioxide particle after being roughened.After roughening
Uranium dioxide particle is fitted into nylon tank, and self-grind nodularization is carried out on horizontal ball mill, is added without any grinding medium in the process
Matter and abrading-ball, obtain rare earth element.Wherein, cold pressing preform pressure is 100MPa~600MPa, dwell time 0.5min
~20min；It is the mesh of 10 mesh ~ 180 to grind broken uranium dioxide particle and cross metallic sieve size.During self-grind, ball milling
The rotating speed of machine be 150r/min ~ 350r/min, the nodularization time be 4 ~ for 24 hours.
Rare earth element after nodularization and tiny molybdenum powder are fitted into nylon tank, are added without according to the volume ratio of setting
Any abrasive media and abrading-ball, and argon filling gas shielded carry out the mixed powder of low energy on horizontal ball mill.During low energy mixes powder,
Tiny molybdenum powder is adhered to rare earth element surface, forms molybdenum powder and coats rare earth element.
Further, the particle size range of molybdenum powder is 0.08 μm ~ 15 μm, and uranium dioxide is with molybdenum powder volume ratio（80-98）：（2-
20）, drum's speed of rotation is 80r/min ~ 250r/min, and the powder mixing cladding time is 0.5h ~ 10h.
Then, the mixing coated powder of preparation is fitted into graphite jig, carries out discharge plasma sinter molding.It will be at
After sample removing mold after type, uranium dioxide fuel ball sample after dimensioned.Sintering temperature is in vitro for electric discharge etc.
1000 DEG C ~ 1650 DEG C, soaking time is 0.5min ~ 30min, and vacuum degree is 5 × 10-2Pa ~ 15Pa.Discharge plasma is sintered
Sample after molding, is demoulded, to get uranium dioxide fuel ball sample after dimensioned.
Fig. 1 ~ Fig. 8 gives the measurement result figure of the present invention.As can be seen that molybdenum powder forms core with rare earth element
（Uranium dioxide）Shell（Molybdenum powder）The mode of action of mixed powder, wherein molybdenum powder and rare earth element shows as physical absorption（Table
Face, such as point 2, point 4, are shown in Fig. 4 and Fig. 6）And mechanical snap（Embedded, such as point 3, point 1 are shown in Fig. 3 and Fig. 5）By discharge plasma
After sintering, the uranium dioxide fuel ball sample of preparation is shown as in microstructure：For " even around uranium dioxide crystal grain
It is continuous netted " passage of heat of molybdenum, this micro-structure can be obviously improved macroscopical heat conductivility of uranium dioxide, enhance uranium dioxide
Fission product withholds performance.Molybdenum maximizes the effect that uranium dioxide thermal conductivity enhances.And the addition of molybdenum is to a certain extent
The linear expansion coefficient of uranium dioxide is reduced, air gap closing time can be effectively postponed, delays mechanics phase interaction of the fuel with involucrum
With further safety of the promotion reactor under accident conditions.
Using the present invention, the introducing of impurity during mixed powder can be greatly reduced, there is raising efficiency, reduce energy consumption, shorten
Period simplifies the advantages such as technique, and quickly and efficiently obtaining has the enhanced uranium dioxide fuel ball of thermal conductivity, and it is anti-to promote core
The intrinsic safety under the economy and accident under normality operating mode should be piled up.The enhanced uranium dioxide of thermal conductivity prepared by the present invention
Pellet can be used as the candidate nuclear fuel and the fault-tolerant nuclear fuel of accident of light-water nuclear reactor, have potential application prospect.
Description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is the rare earth element pictorial diagram prepared by the present invention.
Fig. 2 is that the molybdenum prepared by the present invention coats rare earth element surface topography map.
Fig. 3 is the scanning figure of first vegetarian refreshments 1 in Fig. 2.
Fig. 4 is the scanning figure of first vegetarian refreshments 2 in Fig. 2.
Fig. 5 is the scanning figure of first vegetarian refreshments 3 in Fig. 2.
Fig. 6 is the scanning figure of first vegetarian refreshments 4 in Fig. 2.
Fig. 7 is the thermal conductivity test sample pictorial diagram of the compound fuel ball of uranium dioxide/molybdenum.
Fig. 8 is the micro-structure diagram of the compound fuel ball of uranium dioxide/molybdenum prepared by the present invention.
Fig. 9 is the element surface scan figure of the compound fuel ball of uranium dioxide/molybdenum prepared by the present invention.
Figure 10 is the label figure carried out based on Fig. 9 element Surface scan results.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
.
Embodiment 1
1）Uranium dioxide raw material powder is fitted into sintered-carbide die, cold pressing preform is carried out, being cold-pressed preformed pressure is
Uranium dioxide blank is made in 100MPa, dwell time 20min, demoulding.
2）It is broken by being ground in the uranium dioxide blank agate Yan Portland of preparation, and the mesh metallic sieve of 40 mesh ~ 180 is crossed, it obtains
To the uranium dioxide particle of roughening.
3）Uranium dioxide particle after roughening is fitted into nylon tank, any abrasive media and abrading-ball are not added with, in horizontal ball
Self-grind nodularization is carried out on grinding machine, removes corner angle, drum's speed of rotation 150r/min, and the nodularization time is for 24 hours.In the process, it is not added with
Enter any abrasive media and abrading-ball.After ball milling, the mesh metallic sieve of 40 mesh ~ 180 is crossed, rare earth element is obtained.Less than 40 purposes
Uranium dioxide particle continues grinding and is crushed, and after being more than the powder collection of 180 mesh, is cold-pressed preform.
4）Rare earth element prepared by step 3, tiny molybdenum powder are by volume fraction 98:2 are fitted into nylon tank；Its
In, molybdenum powder particle size range is 0.08 ~ 0.2 μm, any abrasive media and abrading-ball, and argon filling gas shielded is not added with, in horizontal ball mill
Upper progress low energy ball mill mixes powder, and drum's speed of rotation 80r/min, the powder mixing cladding time is 10h.It is tiny during being somebody's turn to do
Molybdenum powder is adhered to rare earth element surface, forms molybdenum powder and coats rare earth element.
5）Molybdenum powder cladding rare earth element powder prepared by step 4 is fitted into graphite jig, plasma discharging is carried out
Body sinter molding, sintering temperature are 1000 DEG C, dwell time 20min, pressure 30MPa, vacuum degree 15Pa.
6）The sintered material of discharge plasma is subjected to demoulding processing, after dimensioned, obtains uranium dioxide fuel
Pellet sample.
After measured, sample manufactured in the present embodiment promotes 28% compared with standard uranium dioxide pellet thermal conductivity, line expansion system
Number declines 5.2%（1000℃）.
Embodiment 2
1）Uranium dioxide raw material powder is fitted into sintered-carbide die, cold pressing preform is carried out, being cold-pressed preformed pressure is
Uranium dioxide blank is made in 350MPa, dwell time 5min, demoulding.
2）It grinds broken in uranium dioxide blank agate Yan Portland prepared by step 1, and crosses the mesh metallic screen of 18 mesh ~ 50
Net, the uranium dioxide particle being roughened.
3）Uranium dioxide particle after roughening is fitted into nylon tank, any abrasive media and abrading-ball are not added with, in horizontal ball
Self-grind nodularization is carried out on grinding machine, removes corner angle, drum's speed of rotation 200r/min, and the nodularization time is 18h.In the process, it is not added with
Enter any abrasive media and abrading-ball.After ball milling, the mesh metallic sieve of 18 mesh ~ 50 is crossed, rare earth element is obtained.Less than 18 purposes two
Urania particle continues grinding and is crushed, and after being more than the powder collection of 50 mesh, is cold-pressed preform.
4）Rare earth element prepared by step 3, tiny molybdenum powder are by volume fraction 95:5 are fitted into nylon tank；Its
In, molybdenum powder particle size range is 0.5 μm ~ 2 μm, any abrasive media and abrading-ball, and argon filling gas shielded is not added with, in horizontal ball mill
Upper progress low energy ball mill mixes powder, and drum's speed of rotation 120r/min, the powder mixing cladding time is 8h.It is tiny during being somebody's turn to do
Molybdenum powder is adhered to rare earth element surface, forms molybdenum powder and coats rare earth element.
5）Molybdenum powder cladding rare earth element powder prepared by step 4 is fitted into graphite jig, plasma discharging is carried out
Body sinter molding, sintering temperature are 1300 DEG C, dwell time 10min, pressure 30MPa, vacuum degree 1.0Pa.
6）The sintered material of discharge plasma is subjected to demoulding processing, after dimensioned, obtains uranium dioxide fuel
Pellet sample.
After measured, sample manufactured in the present embodiment promotes 49% compared with standard uranium dioxide pellet thermal conductivity, line expansion system
Number declines 8.6%（1000℃）.
Embodiment 3
1）Uranium dioxide raw material powder is fitted into sintered-carbide die, cold pressing preform is carried out, being cold-pressed preformed pressure is
Uranium dioxide blank is made in 600MPa, dwell time 0.5min, demoulding.
2）It grinds broken in uranium dioxide blank agate Yan Portland prepared by step 1, and crosses the mesh metallic screen of 10 mesh ~ 40
Net, the uranium dioxide particle being roughened.
3）Uranium dioxide particle after roughening is fitted into nylon tank, any abrasive media and abrading-ball are not added with, in horizontal ball
Self-grind nodularization is carried out on grinding machine, removes corner angle, drum's speed of rotation 350r/min, and the nodularization time is 4h.In the process, it is added without
Any abrasive media and abrading-ball.After ball milling, the mesh metallic sieve of 10 mesh ~ 40 is crossed, rare earth element is obtained.Less than the dioxy of 10 mesh
Change uranium particle continues grinding and is crushed, and after being more than the powder collection of 40 mesh, is cold-pressed preform.
4）Rare earth element prepared by step 3, tiny molybdenum powder are by volume fraction 85:15 are fitted into nylon tank；Its
In, molybdenum powder particle size range is 5 μm ~ 15 μm, any abrasive media and abrading-ball, and argon filling gas shielded is not added with, on horizontal ball mill
It carries out low energy ball mill and mixes powder, drum's speed of rotation 250r/min, the powder mixing cladding time is 0.5h.It is tiny during being somebody's turn to do
Molybdenum powder is adhered to rare earth element surface, forms molybdenum powder and coats rare earth element.
5）Molybdenum powder cladding rare earth element powder prepared by step 4 is fitted into graphite jig, plasma discharging is carried out
Body sinter molding, sintering temperature are 1650 DEG C, dwell time 0.5min, pressure 50MPa, and vacuum degree is 5 × 10-2Pa 。
6）The sintered material of discharge plasma is subjected to demoulding processing, after dimensioned, obtains uranium dioxide fuel
Pellet sample.
After measured, sample manufactured in the present embodiment promotes 98% compared with standard uranium dioxide pellet thermal conductivity, line expansion system
Number declines 16.7%（1000℃）.
Embodiment 4
1）Uranium dioxide raw material powder is fitted into sintered-carbide die, cold pressing preform is carried out, being cold-pressed preformed pressure is
Uranium dioxide blank is made in 450MPa, dwell time 2.5min, demoulding.
2）It grinds broken in uranium dioxide blank agate Yan Portland prepared by step 1, and crosses the mesh metallic screen of 30 mesh ~ 80
Net, the uranium dioxide particle being roughened.
3）Uranium dioxide particle after roughening is fitted into nylon tank, any abrasive media and abrading-ball are not added with, in horizontal ball
Self-grind nodularization is carried out on grinding machine, removes corner angle, drum's speed of rotation 180r/min, and the nodularization time is for 24 hours.In the process, it is not added with
Enter any abrasive media and abrading-ball.After ball milling, the mesh metallic sieve of 30 mesh ~ 80 is crossed, rare earth element is obtained.Less than 30 purposes two
Urania particle continues grinding and is crushed, and after being more than the powder collection of 80 mesh, is cold-pressed preform.
4）Rare earth element prepared by step 3, tiny molybdenum powder are by volume fraction 80:20 are fitted into nylon tank；Its
In, molybdenum powder particle size range is 1 μm ~ 5 μm, any abrasive media and abrading-ball, and argon filling gas shielded is not added with, on horizontal ball mill
It carries out low energy ball mill and mixes powder, drum's speed of rotation 200r/min, the powder mixing cladding time is 2h.During being somebody's turn to do, tiny molybdenum
Powder is adhered to rare earth element surface, forms molybdenum powder and coats rare earth element.
5）Molybdenum powder cladding rare earth element powder prepared by step 4 is fitted into graphite jig, plasma discharging is carried out
Body sinter molding, sintering temperature are 1450 DEG C, dwell time 5min, pressure 350MPa, and vacuum degree is 5 × 10-1Pa 。
6）The sintered material of discharge plasma is subjected to demoulding processing, after dimensioned, obtains uranium dioxide fuel
Pellet sample.
After measured, sample manufactured in the present embodiment promotes 128% compared with standard uranium dioxide pellet thermal conductivity, line expansion
Coefficient declines 19.6%（1000℃）.
The invention is not limited in specific implementation modes above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (10)
1. a kind of preparation method of reticular structure uranium dioxide/compound fuel ball of molybdenum, which is characterized in that including walking as follows
Suddenly：
（1）Uranium dioxide raw material powder is cold-pressed preform
Uranium dioxide raw material powder is fitted into mold, cold pressing preform is carried out, uranium dioxide blank is made in demoulding；
（2）Grinding is broken
Uranium dioxide blank prepared by step 1 is ground to broken, to be roughened uranium dioxide particle；
（3）Self-grind nodularization
The uranium dioxide particle of the roughening of step 2 is put into ball mill, self-grind nodularization is carried out, obtains rare earth element；
（4）Powder coats
By step（3）The rare earth element of preparation, molybdenum powder are filled with inert gas shielding by being put into ball mill, carry out low
Powder can be mixed, during low energy mixes powder, molybdenum powder is adhered to rare earth element surface, forms molybdenum powder and coats rare earth element；
（5）Discharge plasma is sintered one-step shaping
By step（4）The molybdenum powder cladding rare earth element powder of preparation is fitted into graphite jig, carries out discharge plasma burning
Form type；
（6）Demoulding is handled
By step（5）After the uranium dioxide material of discharge plasma sinter molding is demoulded, you can；
The step（4）In, rare earth element, molybdenum powder volume ratio be（80-98）：（2-20）.
2. preparation method according to claim 1, which is characterized in that in the step 1, being cold-pressed preformed pressure is
100MPa~600MPa, dwell time 0.5min~20min.
3. preparation method according to claim 2, which is characterized in that in the step 1, uranium dioxide raw material powder is packed into
In sintered-carbide die, cold pressing preform is carried out, uranium dioxide blank is made in demoulding.
4. preparation method according to claim 1, which is characterized in that in the step 2, grind broken uranium dioxide
It is the mesh of 10 mesh ~ 180 that particle, which crosses metallic sieve size,.
5. preparation method according to claim 4, which is characterized in that in the step 2, titanium dioxide prepared by step 1
It grinds and is crushed in uranium blank agate Yan Portland, cross the metallic sieve of different meshes range, the uranium dioxide particle being roughened.
6. according to claim 1 ~ 5 any one of them preparation method, which is characterized in that in the step 3, drum's speed of rotation is
150r/min ~ 350r/min, the nodularization time be 4 ~ for 24 hours, be added without any abrasive media and abrading-ball in the process.
7. preparation method according to claim 6, which is characterized in that in the step 3, roughening prepared by step 2
Uranium dioxide particle is fitted into nylon tank, is not added with any abrasive media and abrading-ball, and self-grind nodularization is carried out on horizontal ball mill,
Metallic sieve is crossed, rare earth element is obtained.
8. according to claim 1 ~ 7 any one of them preparation method, which is characterized in that in the step 4, the grain size model of molybdenum powder
It is 0.08 μm ~ 15 μm to enclose, rare earth element, molybdenum powder volume ratio be（80-98）：（2-20）, drum's speed of rotation 80r/min
~ 250r/min, the powder mixing cladding time is 0.5h ~ 10h, is not added with any abrasive media and abrading-ball.
9. according to claim 1 ~ 8 any one of them preparation method, which is characterized in that in the step 5, electric discharge etc. is in vitro to burn
It is 1000 DEG C ~ 1650 DEG C to tie molding temperature, and soaking time is 0.5min ~ 30min, and vacuum degree is 5 × 10-2Pa ~ 15Pa。
10. using the product prepared by any one of preceding claims 1 ~ 9 preparation method.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111326265A (en) * | 2020-02-28 | 2020-06-23 | 中国工程物理研究院材料研究所 | Uranium dioxide-carbide composite fuel pellet and preparation method thereof |
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| CN111326265A (en) * | 2020-02-28 | 2020-06-23 | 中国工程物理研究院材料研究所 | Uranium dioxide-carbide composite fuel pellet and preparation method thereof |
| CN111326265B (en) * | 2020-02-28 | 2023-05-02 | 中国工程物理研究院材料研究所 | Uranium dioxide-carbide composite fuel pellet and preparation method thereof |
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