CN106508058B - Cobalt adjusts the preparation technology of cobalt pellet in rod assembly - Google Patents
Cobalt adjusts the preparation technology of cobalt pellet in rod assemblyInfo
- Publication number
- CN106508058B CN106508058B CN200810075450.1A CN200810075450A CN106508058B CN 106508058 B CN106508058 B CN 106508058B CN 200810075450 A CN200810075450 A CN 200810075450A CN 106508058 B CN106508058 B CN 106508058B
- Authority
- CN
- China
- Prior art keywords
- cobalt
- pellet
- rod assembly
- block
- preparation technology
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910017052 cobalt Inorganic materials 0.000 title claims abstract description 125
- 239000010941 cobalt Substances 0.000 title claims abstract description 125
- 239000008188 pellet Substances 0.000 title claims abstract description 95
- 238000005516 engineering process Methods 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 238000005245 sintering Methods 0.000 claims abstract description 48
- 239000000843 powder Substances 0.000 claims abstract description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000007872 degassing Methods 0.000 claims abstract description 11
- 239000001257 hydrogen Substances 0.000 claims abstract description 11
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 9
- 239000003960 organic solvent Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- 239000000356 contaminant Substances 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 239000011733 molybdenum Substances 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- DCXXMTOCNZCJGO-UHFFFAOYSA-N tristearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC DCXXMTOCNZCJGO-UHFFFAOYSA-N 0.000 claims 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims 1
- 238000007710 freezing Methods 0.000 claims 1
- 230000008014 freezing Effects 0.000 claims 1
- 239000011701 zinc Substances 0.000 claims 1
- 229910052725 zinc Inorganic materials 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 11
- 230000007547 defect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000003758 nuclear fuel Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 8
- 238000007493 shaping process Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- GUTLYIVDDKVIGB-IGMARMGPSA-N cobalt-59 atom Chemical compound [59Co] GUTLYIVDDKVIGB-IGMARMGPSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 125000001967 indiganyl group Chemical group [H][In]([H])[*] 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- GUTLYIVDDKVIGB-OUBTZVSYSA-N Cobalt-60 Chemical compound [60Co] GUTLYIVDDKVIGB-OUBTZVSYSA-N 0.000 description 1
- 229910000846 In alloy Inorganic materials 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002158 endotoxin Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Powder Metallurgy (AREA)
Abstract
The present invention relates to the manufacturing technology of nuclear fuel element, and in particular to a kind of used by nuclear reactor cobalt adjusts the preparation technology of rod assembly SMIS block.Present invention process comprises the steps：(1) granulating powders；(2) powder compacting；(3) pellet sintering；(4) pellet degasification sintering.Cobalt pellet draw ratio obtained in present invention process is more than 4, and hydrogen impurity content meets the technical requirements for preparing needs, meeting that cobalt regulation rod assembly works in reactor of high length-diameter ratio, high density, zero defect cobalt pellet, is suitable to batch and prepares less than 1 μ g/g.
Description
Technical field
The present invention relates to the manufacturing technology of nuclear fuel element, and in particular to a kind of used by nuclear reactor cobalt
Adjust the preparation technology of rod assembly SMIS block.
Background technology
Replace stainless steel regulating rod using cobalt regulating rod in nuclear reactor, captured by cobalt -59
Neutron obtains the radioactive source of cobalt -60.The pellet of cobalt -59 is the core that cobalt adjusts rod assembly, quality
Directly influence the yield of radioactive source, in heap in terms of safety the problem of.
Cobalt pellet has the requirement of its particularity：Cobalt core block size be diameter of phi 6.22mm ±
0.02mm, height 25.1mm ± 0.05mm, belongs to high length-diameter ratio；Cobalt pellet density be 8.55~
8.65g/cm3, density domination narrow range；Cobalt total amount >=99.7%, total impurities≤0.3%, control
H element processed and the big element of neutron cross section absorption coefficient.
The pellet of cobalt -59 prepared at present with isostatic cool pressing technique, due to being needed before isostatic cool pressing
Substantial amounts of additive, such as polyvinyl alcohol or paraffin are added, causes sintering rear impurity content higher,
And because the green compact preparation technology such as cold is complicated, causes production efficiency low, be not suitable for element
Batch production.
In general powder metallurgical technique, the pellet major diameter of shaping is smaller, and cobalt pellet technology
It is required that draw ratio reached more than 4, green compact draw ratio has also reached 3.6~3.7.It is so high
Draw ratio cause pellet shaping and sinter it is all more difficult, cobalt pellet shape the demoulding when green compact
There is layering, fracture, eel-like figure occur after sintering, phenomenon of bending over, and the defects such as stomata occur.
The content of the invention
It is an object of the invention to provide the preparation technology of cobalt pellet in a kind of cobalt regulation rod assembly,
It can overcome super-fine cobalt powder difficult forming, it is ensured that pellet uniformity in shaping, sintering process,
Impurity is not introduced in preparation process, the cobalt pellet draw ratio prepared is more than 4, and hydrogen impurity contains
Amount is less than 1 μ g/g, meets into heap cobalt total amount and total impurities requirement.
A kind of cobalt of the present invention adjusts the preparation technology of rod assembly SMIS block, and it includes as follows
Step：
(1) granulating powders
Cobalt dust is compressed into tablet form cobalt base in 350~430MPa, sheet cobalt base crosses granulator
Broken, shake sieve in vibrating sieving machine, screens out cobalt granule of the size between 150~380 μm；
(2) powder compacting
Cobalt granule made from step (1) is put into sintered-carbide die, then press pressurizes
To forming pressure in 690~870MPa, compacting obtains cobalt core block green body；
(3) pellet is sintered
Cobalt core block green body made from step (2) is put into vacuum sintering furnace, in hydrogen atmosphere
Lower use staged heating mode is sintered；Described staged heating mode is at 300 DEG C
1~2 hour is incubated respectively with 500 DEG C of two temperature ranges, is incubated at 850~950 DEG C
2~3 hours, then cool；
(4) pellet degasification is sintered
Cobalt pellet after being sintered to step (3) is ground, then using hydrogen-free organic solvent
Clean to remove cobalt pellet surface and oil contaminant and water mark；Then cobalt pellet is put into vacuum sintering furnace
It is interior, below 1Pa is evacuated to, 290~310 DEG C is warming up to and is incubated 1~2 hour, cooling,
Cobalt pellet is made.
Cobalt as described above adjusts institute in the preparation technology of rod assembly SMIS block, its step (1)
The cobalt dust of use is than surface in 1.48m2/ more than g.
Cobalt as described above adjusts institute in the preparation technology of rod assembly SMIS block, its step (2)
The sintered-carbide die used processes for YG15 wolfram steel materials.
Cobalt as described above adjusts the preparation technology of rod assembly SMIS block, and it is in step (2)
Cobalt granule is put into before sintered-carbide die, using the turbid liquid of the carbon tetrachloride of zinc stearate to mould
Former inwall is lubricated.
Cobalt as described above adjusts institute in the preparation technology of rod assembly SMIS block, its step (3)
It is that vertical type is placed in sintering furnace during the cobalt pellet green sintering stated；Sintering is made using molybdenum boat
For load plate.
Cobalt as described above adjusts institute in the preparation technology of rod assembly SMIS block, its step (3)
Average heating rate is 2.8~3.2 DEG C/min during the cobalt pellet green sintering stated.
Cobalt as described above adjusts institute in the preparation technology of rod assembly SMIS block, its step (4)
That states is ground to cobalt pellet, is first to use less grinder for grinding cobalt pellet, to ensure cobalt core
Block cylinder size and precision, are then processed with numerically controlled lathe to cobalt pellet end face again.
Described cobalt adjusts the preparation technology of rod assembly SMIS block, it is characterised in that：Step (4)
Described in hydrogen-free organic solvent be carbon tetrachloride.
Effect of the invention is that：The preparation technology of cobalt pellet of the present invention by granulation, into
Totally four parts are constituted for type, sintering and degasification sintering, and its obtained cobalt pellet draw ratio is more than 4,
And hydrogen impurity content is less than μ g/g, high length-diameter ratio, high density, zero defect cobalt pellet are met
Preparing needs, and meets the technical requirements that cobalt regulation rod assembly works in reactor.Due to cobalt powder
Without binder and lubricant in pelletising process, while in former during cobalt pellet shaping green compact
The lubricant that inwall is smeared, can remove in grinding, all ensure that total into heap cobalt pellet impurity
The control requirement of amount.By pelletizing and using YG15 sintered-carbide dies, powder is improved
The maximum pressing pressure of mobility and mould, thus cobalt core block green body is had higher density and more
Good axial uniformity, result in the reduction of sintering temperature and the raising of density after sintering again,
Allowance is reduced, the utilization rate of cobalt powder is improved, reduces energy consumption.Rank is used during sintering
Ladder type heats up, and is incubated respectively at 300 DEG C and 500 DEG C, can fully discharge internal gas,
The impurity oxygen in cobalt material can be made fully to be reduced, impurity oxygen content is reduced, improve cobalt core
The mechanical performance of block.By the water removal of vacuum and low temperature sintering, dehydrogenation, make cobalt pellet H impurity controls
System is in below 1 μ g/g, it is ensured that enter heap safety.
Brief description of the drawings
Fig. 1 is cobalt pellet sintering process curve；
Fig. 2 is cobalt pellet degassing process curve.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment to cobalt of the present invention adjust rod assembly in cobalt
The preparation technology of pellet is described further.
Embodiment 1
A kind of cobalt of the present invention adjusts the preparation technology of rod assembly SMIS block, and it includes as follows
Step：
(1) granulating powders
Take than surface in 1.48m2/ more than g, 50g cobalt dusts, in 350MPa Forming under Pressure,
Cobalt base is compressed into tablet form, then sheet cobalt base is crossed into particle crusher machine, granulator uses 600 μm
Bore diameter stainless steel screen cloth, the sieve that shaken in formula vibrating sieving machine is hit on top, screens out size at 150~380 μm
Between particle.
(2) powder compacting
Cobalt granule made from above-mentioned steps (1) is put into the hard of YG15 wolfram steel material processing
In alloy mold, and former inwall is lubricated using the carbon tetrachloride turbid liquid of zinc stearate,
Charge is 7.50g in mould, and press is forced into forming pressure for 690MPa, and the dwell time is
10 seconds, it is pressed into diameter 7.2mm, height 26.3mm cobalt core block green body.Using press machine
Tool is stripped, and the averag density deviation of every piece of core base after shaping is in ± 0.02g/cm3Between, it is raw
Base density reaches 6.5g/cm3。
(3) pellet is sintered
It will be inserted in vacuum atmosphere sintering furnace, carried out by the cobalt core block green body of surface quality detection
Pellet is sintered, and using molybdenum boat as load plate, pellet uses vertical type during sintering.In H2Atmosphere
In, average heating rate is 2.8 DEG C/min, and 1 hour is incubated respectively at 300 DEG C and 500 DEG C,
Sinter to 850 DEG C and be incubated 2.5 hours, sintering cobalt pellet is made after sintering for furnace cooling.Burn
Tie process curve as shown in Figure 1.
(4) pellet degasification is sintered
Cobalt pellet after being sintered using less grinder for grinding, it is ensured that cylinder diameter tolerance is in ± 0.02mm
Between, roughness Ra≤0.4 μm is processed using numerically controlled lathe to its end face, and height is public
Difference is between ± 0.02mm, roughness Ra≤0.4 μm.Again by cobalt pellet in hydrogen-free organic solvent
Cleaned in carbon tetrachloride, remove cobalt pellet surface and oil contaminant and water mark.Then by the pellet after processing
Insert in vacuum atmosphere sintering furnace, be evacuated to below 1Pa, be warming up to 290 DEG C, insulation 1
Furnace cooling after hour.It can obtain cobalt pellet of the present invention.Degasification sintering process curve
As shown in Figure 2.
Cobalt of the present invention adjusts the preparation technology of rod assembly SMIS block, due to cobalt pellet crystal grain
The unilateral control such as degree needs so that sintering temperature ＜ 0.7Tm, sintering temperature is relatively low, therefore needs
Certain limitation is proposed to raw material cobalt powder, it is preferred by parameter, it is desirable to which that cobalt powder reaches than surface
1.48m2/ more than g.Cobalt core block green body draw ratio is more than 4, green compact is improved when this to be molded close
Degree becomes difficult, be this present invention preferably YG15 hard alloy as mold materials, make mould
With high finish and wearability, the decay of pressing pressure, the life-span of mould are reduced
Increased.For reduction briquetting pressure and ejection pressure, four chlorinations of zinc stearate can be used
The turbid liquid of carbon is lubricated to former inwall.Control climate when for the benefit of sintering, the present invention uses molybdenum
Boat is as load plate, and molybdenum has very high stability under atmospheric hydrogen atmosphere, while using pellet
Upright to place, defect of bending over just is not present in pellet after sintering；Staged heating sintering, which is promoted, to be put
Gas and the progress of partial reduction reaction.Because cobalt pellet is sintered in a hydrogen atmosphere, belong to when grinding
Yu Youshui is processed, and causes pellet hydrogen content higher (2~3 μ g/g), hydrogen foot reactor endotoxin,
Hydrogen be mainly absorption on pellet, its antidetonation heat resistance is poor, by shake can to disengage it from,
But scuffing is easily produced to cobalt block, therefore remaining hydrogen is removed using cryogenic vacuum sintering.Grinding
Cobalt pellet surface is caused to be contaminated, the present invention carries out the cleaning before degasification from carbon tetrachloride,
Pellet can be cleaned and H pollution is avoided.
The cobalt pellet prepared through present invention process, a diameter of 6.20~6.24mm, highly reaches
25.1mm, density reaches 8.55~8.65g/cm3(97~98%T.D.), average crystal grain 3~4
μm, hole is evenly distributed, and cobalt total amount is more than 99.7%, and H element content is less than 1 μ g/g, table
0.4 μm of surface roughness Ra ＜, elongation percentage is more than 13.5%, meets into heap use requirement.
Embodiment 2
(1) granulating powders
60g cobalt dusts are taken, in 400MPa Forming under Pressure, cobalt base are compressed into tablet form, then will
Obtained sheet cobalt base crosses particle crusher machine, and granulator uses 600 μm of bore diameter stainless steel screen clothes,
Shake sieve in vibrating sieving machine, screens out particle of the size between 150~380 μm.
(2) powder compacting
Cobalt granule made from step (1) is put into sintered-carbide die, charge is 7.50g,
Press is forced into forming pressure for 770MPa, and pressurize 10 seconds is pressed into diameter 7.2mm,
Height 26.1mm cobalt core block green body.Mechanical stripping obtains cobalt core block green body.
(3) pellet is sintered
Cobalt core block green body obtained by step (2) is inserted in vacuum atmosphere sintering furnace, pellet is carried out
Sintering, pellet uses vertical type during sintering.In H2In atmosphere, average heating rate is 3.0/min,
1.5 hours are incubated respectively at 300 DEG C and 500 DEG C, 880 DEG C is sintered to and is incubated 3 hours, with stove
Sintering cobalt pellet is made after cooling, sintering.
(4) pellet degasification is sintered
Cobalt pellet after being sintered to step (3) is ground, then using hydrogen-free organic solvent
Then cleaning is evacuated to below 1Pa, is warming up to remove cobalt pellet surface and oil contaminant and water mark
300 DEG C, furnace cooling after being incubated 1.5 hours.It can obtain cobalt pellet of the present invention.
Embodiment 3
(1) granulating powders
Surface is taken in 1.48m2/ more than g, 70g cobalt dusts, in 430MPa Forming under Pressure,
It is compressed into tablet form cobalt base.Obtained sheet cobalt base is crossed into particle crusher machine, granulator is used
600 μm of bore diameter stainless steel screen clothes, shake sieve in vibrating sieving machine, screens out size at 150~380 μm
Between particle.
(2) powder compacting
Cobalt granule made from step (1) is put into YG15 sintered-carbide dies, charge
For 7.50g, press is forced into forming pressure for 870MPa, is pressed into diameter 7.2mm, high
Spend 26.0mm cobalt core block green body.Mechanical stripping obtains cobalt core block green body.
(3) pellet is sintered
It will be inserted in vacuum atmosphere sintering furnace, entered by the cobalt core block green body of surface quality detection
Row pellet is sintered.In H2In atmosphere, average heating rate is 3.2 DEG C/min, at 300 DEG C and
500 DEG C are incubated 2 hours respectively, sinter to 950 DEG C of temperature and are incubated 2 hours, furnace cooling,
Sintering cobalt pellet is made after sintering.
(4) pellet degasification is sintered
Cobalt pellet after being sintered using less grinder for grinding, it is ensured that cylinder size and precision, using number
Control lathe is processed to its end face.Again by cobalt pellet in hydrogen-free organic solvent carbon tetrachloride it is clear
Wash, remove cobalt pellet surface and oil contaminant and water mark.Pellet after processing is inserted into vacuum atmosphere sintering
In stove, below 1Pa is evacuated to, 310 DEG C are warming up to, furnace cooling after being incubated 1 hour.
It can obtain cobalt pellet of the present invention.
Embodiment 4
A kind of cobalt of the present invention adjusts the preparation technology of rod assembly SMIS block, and it includes as follows
Step：
(1) granulating powders
55g cobalt dusts are taken, in 360MPa Forming under Pressure, cobalt base are compressed into tablet form, then will
Sheet cobalt base crosses particle crusher machine, and shake sieve in vibrating sieving machine, screens out size at 150~380 μm
Between particle.
(2) powder compacting
Cobalt granule made from above-mentioned steps (1) is put into the hard alloy of YG15 materials processing
In mould, and former inwall is lubricated using the carbon tetrachloride turbid liquid of zinc stearate, mould
Middle charge is 7.50g, and press is forced into forming pressure for 700MPa, and the dwell time is 15
Second, it is pressed into diameter 7.2mm, height 26.3mm cobalt core block green body.Using press machinery
The demoulding, the averag density deviation of every piece of core base after shaping is in ± 0.02g/cm3Between, green compact
Density reaches 6.5g/cm3。
(3) pellet is sintered
It will be inserted in vacuum atmosphere sintering furnace, carried out by the cobalt core block green body of surface quality detection
Pellet is sintered, and using molybdenum boat as load plate, pellet uses vertical type during sintering.In H2Atmosphere
In, average heating rate is 2.9 DEG C/min, and 1 hour is incubated respectively at 300 DEG C and 500 DEG C,
Sinter to 950 DEG C and be incubated 2.5 hours, sintering cobalt pellet is made after sintering for furnace cooling.
(4) pellet degasification is sintered
Cobalt pellet after being sintered using less grinder for grinding, it is ensured that cylinder diameter tolerance is in ± 0.02mm
Between, roughness Ra≤0.4 μm is processed using numerically controlled lathe to its end face, and height is public
Difference is between ± 0.02mm, roughness Ra≤0.4 μm.Again by cobalt pellet in hydrogen-free organic solvent
Cleaned in carbon tetrachloride, remove cobalt pellet surface and oil contaminant and water mark.Then by the pellet after processing
Insert in vacuum atmosphere sintering furnace, be evacuated to below 1Pa, be warming up to 300 DEG C, insulation 1
Furnace cooling after hour.It can obtain cobalt pellet of the present invention.
Claims (8)
1. a kind of cobalt adjusts the preparation technology of rod assembly SMIS block, it comprises the following steps：
(1) granulating powders
Cobalt dust is compressed into tablet form cobalt base in 350~430MPa, sheet cobalt base crosses granulator
Broken, shake sieve in vibrating sieving machine, screens out cobalt granule of the size between 150~380 μm；
(2) powder compacting
Cobalt granule made from step (1) is put into sintered-carbide die, then press pressurizes
To forming pressure in 690~870MPa, compacting obtains cobalt core block green body；
(3) pellet is sintered
Cobalt core block green body made from step (2) is put into vacuum sintering furnace, in hydrogen atmosphere
Lower use staged heating mode is sintered；Described staged heating mode is at 300 DEG C
1~2 hour is incubated respectively with 500 DEG C of two temperature ranges, is incubated at 850~950 DEG C
2~3 hours, then cool；
(4) pellet degasification is sintered
Cobalt pellet after being sintered to step (3) is ground, then using hydrogen-free organic solvent
Clean to remove cobalt pellet surface and oil contaminant and water mark；Then cobalt pellet is put into vacuum sintering furnace
It is interior, below 1Pa is evacuated to, 290~310 DEG C is warming up to and is incubated 1~2 hour, cooling,
Cobalt pellet is made.
2. cobalt according to claim 1 adjusts the preparation technology of rod assembly SMIS block, its
It is characterised by：Cobalt dust employed in step (1) is than surface in 1.48m2/ more than g.
3. cobalt according to claim 1 adjusts the preparation technology of rod assembly SMIS block, its
It is characterised by：Sintered-carbide die employed in step (2) adds for YG15 wolfram steel materials
Work is formed.
4. cobalt according to claim 1 adjusts the preparation technology of rod assembly SMIS block, its
It is characterised by：Before cobalt granule is put into sintered-carbide die in step (2), using tristearin
The turbid liquid of carbon tetrachloride of sour zinc is lubricated to mold cavity block inwall.
5. cobalt according to claim 1 adjusts the preparation technology of rod assembly SMIS block, its
It is characterised by：It is that vertical type is placed on burning during cobalt pellet green sintering described in step (3)
In freezing of a furnace；Sintering is used as load plate using molybdenum boat.
6. cobalt adjusts the preparation technology of rod assembly SMIS block according to claim 1 or 5,
It is characterized in that：Average heating rate is during cobalt pellet green sintering described in step (3)
2.8~3.2 DEG C/min.
7. cobalt according to claim 1 adjusts the preparation technology of rod assembly SMIS block, its
It is characterised by：Being ground to cobalt pellet described in step (4), is first to use centreless grinding
Bed grinding cobalt pellet, to ensure cobalt pellet cylinder size and precision, then again with numerically controlled lathe pair
Cobalt pellet end face is processed.
8. cobalt according to claim 1 adjusts the preparation technology of rod assembly SMIS block, its
It is characterised by：Hydrogen-free organic solvent described in step (4) is carbon tetrachloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810075450.1A CN106508058B (en) | 2008-05-15 | 2008-05-15 | Cobalt adjusts the preparation technology of cobalt pellet in rod assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810075450.1A CN106508058B (en) | 2008-05-15 | 2008-05-15 | Cobalt adjusts the preparation technology of cobalt pellet in rod assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106508058B true CN106508058B (en) | 2011-03-30 |
Family
ID=58264218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810075450.1A Expired - Fee Related CN106508058B (en) | 2008-05-15 | 2008-05-15 | Cobalt adjusts the preparation technology of cobalt pellet in rod assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106508058B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108221015A (en) * | 2017-12-28 | 2018-06-29 | 中核北方核燃料元件有限公司 | A kind of medical cobalt source cobalt pellet nickel plating process |
| CN108297251A (en) * | 2017-12-28 | 2018-07-20 | 中核北方核燃料元件有限公司 | Medical cobalt adjusts rod assembly cobalt pellet extrusion forming process |
| CN113012832A (en) * | 2019-12-20 | 2021-06-22 | 中核北方核燃料元件有限公司 | UO2Composite UN-UO2Method for producing fuel pellets |
| CN114613525A (en) * | 2021-06-30 | 2022-06-10 | 上海核工程研究设计院有限公司 | Cobalt adjusting rod core body for producing high-specific-activity cobalt radioactive source by utilizing heavy water reactor |
-
2008
- 2008-05-15 CN CN200810075450.1A patent/CN106508058B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108221015A (en) * | 2017-12-28 | 2018-06-29 | 中核北方核燃料元件有限公司 | A kind of medical cobalt source cobalt pellet nickel plating process |
| CN108297251A (en) * | 2017-12-28 | 2018-07-20 | 中核北方核燃料元件有限公司 | Medical cobalt adjusts rod assembly cobalt pellet extrusion forming process |
| CN113012832A (en) * | 2019-12-20 | 2021-06-22 | 中核北方核燃料元件有限公司 | UO2Composite UN-UO2Method for producing fuel pellets |
| CN114613525A (en) * | 2021-06-30 | 2022-06-10 | 上海核工程研究设计院有限公司 | Cobalt adjusting rod core body for producing high-specific-activity cobalt radioactive source by utilizing heavy water reactor |
| CN114613525B (en) * | 2021-06-30 | 2024-05-14 | 上海核工程研究设计院股份有限公司 | Cobalt regulating rod core body for producing high specific activity cobalt radioactive source by using heavy water reactor |
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| GR03 | Grant of secret patent right | ||
| DC01 | Secret patent status has been lifted | ||
| DCSP | Declassification of secret patent | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 |