CN108179313A - Resistance to oxidation lead containing Sr lithium alloy with extremely low work hardening rate - Google Patents
Resistance to oxidation lead containing Sr lithium alloy with extremely low work hardening rate Download PDFInfo
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- CN108179313A CN108179313A CN201810124714.1A CN201810124714A CN108179313A CN 108179313 A CN108179313 A CN 108179313A CN 201810124714 A CN201810124714 A CN 201810124714A CN 108179313 A CN108179313 A CN 108179313A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C11/00—Alloys based on lead
- C22C11/02—Alloys based on lead with an alkali or an alkaline earth metal as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/12—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of lead or alloys based thereon
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses resistance to oxidation lead containing Sr lithium alloys and its processing technology with extremely low work hardening rate.According to weight percent, the ingredient of the alloy is：Li:1.2‑1.6wt.%,Sr:0.2‑0.6wt.%,Pt:0.2‑0.4wt.%,Ag:0.5 0.8wt.%, Mo:0.4‑0.6wt.%,Pr:0.2 0.4wt.%, surplus are lead.The lead lithium alloy has extremely low work hardening rate, and outstanding oxidation resistent susceptibility.The shielding material metal of performance beyond tradition, and wide application will be obtained in military, civil field.
Description
Technical field
The present invention relates to technical field of alloy, specifically, being related to a kind of lead lithium alloy.
Background technology
Nuclear reactor is a kind of to start, control and maintain nuclear fission or the device of nuclear fusion chain reaction.Relative to nuclear weapon
The uncontrolled chain reaction that instant of detonation is occurred, among reactor, the rate that core becomes can be precisely controlled, energy
It can outward be discharged with slower speed, be utilized for people.For nuclear reactor there are many purposes, currently the most important purposes is to generate
Thermal energy other fuel to be replaced to heat water, generates the facilities operating such as steam-electric power or driving aircraft carrier.Some reactor quilts
For the isotope for being produced as medical treatment and industrial use or for producing weapons grade plutonium.Some reactor operations are only used for studying.
Current whole business nuclear reactor is all based on nuclear fission.
The main function of Shielding Materials for Nuclear Radiation is absorption or weakens neutron and bifurcation ray.To meet various reactors especially
It is the requirement increasingly harsher to shielding material of fast reactor and mobile reactor, the shielding material there is an urgent need to be developed not only has
There is good comprehensive shielded effect, but also there should be good mechanical property.Shielding material has strong absorption to ray
And scattering process, prepared by the research of radiation protection material suffers from extremely important meaning in national defence and civil field.Therefore, core
The development of radiation shielding material is favored and is paid attention to by various countries as important scientific research task always, and relevant research and development are in state
It is inside and outside all very active.
Although there is the research largely about nuclear screening material at present, these materials still have obdurability and are difficult to meet work
Requirement, heat resistance for structual shield material are bad, comprehensive shielded effect is bad, volume be difficult to greatly mobile and Radiation hardness compared with
The problems such as poor.The integrated requirement of function and structure is taken into account simultaneously, seriously limits its application in shielding harness.Expand core
It is the important cause to involve the interests of the state and the people that can utilize, and accelerates the important energy source strategy that nuclear power developing is China.And nuclear reactor is transported
The nuke rubbish generated in the links such as row, nuclear fuel cycle, the elimination of nuclear facilities has hot.Function admirable, moderate cost, technique
There are larger application prospects in the fields such as nuclear power facility and nuke rubbish storing for ripe high-strength plumbum-based shielding material.It develops high
Strong lead base shielding material simultaneously further improves its cost performance, will obtain wide application in military, civil field, significant.
The addition of lithium allows the density of density ratio majority alloy of tin lithium alloy will be low.And with the increase of lithium content,
Density can also be reduced further;(2) intensity is high.Tin lithium alloy has very high intensity, and intensity will not be because of the increasing of lithium content
Add and significant change occurs, and the intensity of alloy can be further improved by adding the elements such as copper, magnesium, zinc;(3) rigidity
It is high.Tin lithium alloy possesses very high rigidity, and non-deformability is strong, and rigidity can also be further improved with the increase of lithium content;
(4) it is antifatigue.Tin lithium alloy anti-fatigue performance is excellent, and service life is long.
In melting and forming process oxidation easily occurs for lead lithium alloy, burning is even exploded, not only to the molding of part
It damages with performance, also easily injures human body and pollution environment.One important directions of lead lithium alloy industrialization are exactly such as
What prevents the oxidizing fire under its high temperature.At present frequently with chlorate flux protection method and inert gas shielding in metallurgy industry
Method.But both methods has the defects of it is difficult to avoid that, is such as also easy to produce toxic gas pollution environment and flux is caused to be mingled with
And damage alloy property.In addition, melting, casting equipment and complex process, increase cost.Lead lithium alloy is solved to melt in an atmosphere
Another approach that burning is generated during refining is to add alloying element into lead lithium alloy, reaches fire-retardant mesh by the method for alloying
's.Its mechanism of alloying ignition-proof method is to add specific alloying element in lead lithium alloy fusion process to influence alloy oxidation
Thermodynamics and dynamics process forms dense oxidation film and nitride film with protective effect, reaches and prevents alloy vigorous oxidation
It is substantially reduced with the tendency of the purpose of nitridation, and oxidizing fire of the lead lithium alloy during following process, so as to improve lead
The process safety of lithium alloy.Lead lithium alloy not only has excellent casting character, and high temperature resistance is also significantly larger than existing
Shielding material metal.
Invention content
The purpose of the present invention is to overcome the deficiency in the prior art, provide one kind can under 350-400 degree atmospheric conditions into
Resistance to oxidation lead containing the Sr lithium alloy and its processing technology with extremely low work hardening rate of row melting.And in this temperature range melting
Alloy final products not only have an extremely low work hardening rate, oxidation resistent susceptibility is also significantly larger than existing shielding material lead
Alloy.This method also have production cost it is low, convenient for large-scale production the characteristics of.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of resistance to oxidation lead containing Sr lithium alloy with extremely low work hardening rate.By weight percentage, the composition of alloy is：
Li: 1.2-1.6wt.%,Sr:0.2-0.6wt.%,Pt:0.2-0.4wt.%,Ag:0.5-0.8wt.%, Mo:0.4-0.6wt.%,
Pr:0.2-0.4wt.%, surplus are lead.The lead lithium alloy is in fusion process because volatilizing and forming the reasons such as clinker and lose
Weight is in 1.0-3.0wt.% or so.
The preparation method of above-mentioned resistance to oxidation lead containing the Sr lithium alloy with extremely low work hardening rate, includes the following steps：
As above the raw material matched is added in the electric induction furnace of atmosphere protection, and using silicon carbide crucible；Sensing heating is to 350-400
Degree forms alloy solution, and be sufficiently stirred 10 minutes or so using electromagnetic agitation effect；Alloy liquid is kept the temperature in 350-400 degree
Standing is cast in the same level equipment of heat top and carries out semi-continuous casting into required slab ingot after ten minutes, and ingot casting moves down speed and is
10-15m/min.The slab ingot can regard rolling embryo material and prepare more thin lead lithium alloy for the pressure rolling of subsequent handling
Plank.The last heat treatment procedure of these planks is：Vacuum solid solution handles 214 degree, 2.9 hours；Vacuum aging handles 138 degree,
1.4 hour.
Compared with prior art, the present invention has the advantages that：
（1）Patent of the present invention can't fully meet existing for the mechanics and oxidation resistent susceptibility of current shielding material metal
The present situation for having demand provides a kind of novel materialogy solution.The alloy has extremely excellent flame retardant property, can be with
Reach and stand 5 hours without significantly burning under atmospheric environment in 350-400 temperature ranges.To liquid alloy into
During the melt treatments such as row stirring, air blowing, after its skin covering of the surface is destroyed because being vigorously stirred, energy rapid regeneration successfully hinders
The burning of alloy.And the weight that the lead lithium alloy loses in fusion process because of the reasons such as volatilization and formation clinker is less than
3.0wt.% or so.
（2）The addition of lithium allows the density of density ratio majority alloy of lead lithium alloy will be low.And with the increasing of lithium content
Add, density can also be reduced further.Lead lithium alloy has very high intensity, and intensity will not occur because of the increase of lithium content
Significant change, and the intensity of alloy can be further improved by adding the elements such as copper, magnesium, zinc.Lead lithium alloy possesses very high
Rigidity, non-deformability is strong, and rigidity can also be further improved with the increase of lithium content.
（3）Physics, chemical compatibility and the interface compatibility that the alloy is successfully solved between lead and alloying element are asked
Topic, overcomes the difference in specific gravity between constituent element, realizes alloying element and alloy mutually being uniformly distributed in lead base body.And with flowing
The advantages that property is good, and filling performance is favourable, shrinkage cavity formability is small, and molten metal is inspiratory small.With low liquid-solid phase setting temperature
Range can solve the technical barriers such as hot cracking tendency during casting is big, and casting cavity is low with loose apparent product yield rate.
（4）The lead lithium alloy processing performance is very excellent, and cutting speed can be the 2- of universal shield material metal
3 times.At room temperature, the tensile strength of the alloy reaches 300-310MPa.And traditional shielding material with metal at room temperature
Tensile strength is respectively 230-250MPa.The material has extremely low work hardening ability, can be in the operation of rolling without in
Between heat treatment or prolonged room temperature Recovery and recrystallization and by the amount of rolling under every time 30-40% by the thickness of final plank
Degree is rolled down to the 2-8% of original depth.And general shielding material metal due to intensity is big and work hardening rate is higher.It is necessary
Softened by the reply under Recovery and recrystallization or high temperature at room temperature.Under 100 degree, the oxidation rate of the material is
3.2×10-4Mm/.Thus 20 years or more are used safely without apparent oxidative phenomena in the environment of temperature is less than 100 degree
Occur.For fields such as core heap, medical radiation course shielding, nuclear waste disposals, the peace of nuclear reactor system can be effectively ensured
Row for the national games improves the system operation service life.
Specific embodiment
Embodiment 1
A kind of resistance to oxidation lead containing Sr lithium alloy in 350 degree of meltings with extremely low work hardening rate.By weight percentage, alloy
Chemical composition be：Li: 1.4wt.%,Sr:0.3wt.%,Pt:0.2wt.%,Ag:0.6wt.%, Mo:0.5wt.%, Pr:
0.3wt.%, surplus are lead.The preparation method of alloy：As above the raw material matched is added in the electric induction furnace of atmosphere protection, and
Using silicon carbide crucible；Sensing heating forms alloy solution, and be sufficiently stirred 10 minutes left sides using electromagnetic agitation effect to 350 degree
It is right；Alloy liquid is stood to be cast to after ten minutes in the same level equipment of heat top in 350 degree of heat preservations and carries out semi-continuous casting into institute
The slab ingot needed, ingot casting move down speed as 12m/min.The slab ingot can regard the pressure rolling that rolling embryo material is used for subsequent handling
To prepare more thin lead lithium alloy plank.The last heat treatment procedure of these planks is：Vacuum solid solution handles 214 degree, and 2.9 is small
When；Vacuum aging handles 138 degree, 1.4 hours.
The lead lithium alloy processing performance is very excellent, and cutting speed can be 2.6 times of universal shield material metal.
At room temperature, the tensile strength of the alloy reaches 302MPa.And tensile strength of traditional shielding material with metal at room temperature
Respectively 230-250MPa.The material has extremely low work hardening ability, can not have intermediate heat-treatment in the operation of rolling
Or prolonged room temperature Recovery and recrystallization and by every time under 35% the amount of rolling the thickness of final plank is rolled down to initially
The 2-8% of thickness.And general shielding material metal due to intensity is big and work hardening rate is higher.It must be by room temperature
Reply under Recovery and recrystallization or high temperature is softened.Under 100 degree, the oxidation rate of the material is 3.2 × 10-4mm/
Year.It thus uses safely in the environment of temperature is less than 100 degree 20 years or more and occurs without apparent oxidative phenomena.For core
The fields such as heap, medical radiation course shielding, nuclear waste disposal can effectively ensure the safe operation of nuclear reactor system, improve
The system operation service life.The lead lithium alloy is in fusion process because the weight for volatilizing and forming the reasons such as clinker and losing exists
1.4wt.% or so.
Embodiment 2
A kind of resistance to oxidation lead containing Sr lithium alloy in 370 degree of meltings with extremely low work hardening rate.By weight percentage, alloy
Chemical composition be：Li: 1.3wt.%,Sr:0.5wt.%,Pt:0.3wt.%,Ag:0.5wt.%, Mo:0.6wt.%, Pr:
0.3wt.%, surplus are lead.The preparation method of alloy：As above the raw material matched is added in the electric induction furnace of atmosphere protection, and
Using silicon carbide crucible；Sensing heating forms alloy solution, and be sufficiently stirred 10 minutes left sides using electromagnetic agitation effect to 370 degree
It is right；Alloy liquid is stood to be cast to after ten minutes in the same level equipment of heat top in 370 degree of heat preservations and carries out semi-continuous casting into institute
The slab ingot needed, ingot casting move down speed as 10m/min.The slab ingot can regard the pressure rolling that rolling embryo material is used for subsequent handling
To prepare more thin lead lithium alloy plank.The last heat treatment procedure of these planks is：Vacuum solid solution handles 214 degree, and 2.9 is small
When；Vacuum aging handles 138 degree, 1.4 hours.
The lead lithium alloy processing performance is very excellent, and cutting speed can be 2.4 times of universal shield material metal.
At room temperature, the tensile strength of the alloy reaches 308MPa.And tensile strength of traditional shielding material with metal at room temperature
Respectively 230-250MPa.The material has extremely low work hardening ability, can not have intermediate heat-treatment in the operation of rolling
Or prolonged room temperature Recovery and recrystallization and by every time under 36% the amount of rolling the thickness of final plank is rolled down to initially
The 2-8% of thickness.And general shielding material metal due to intensity is big and work hardening rate is higher.It must be by room temperature
Reply under Recovery and recrystallization or high temperature is softened.Under 100 degree, the oxidation rate of the material is 3.2 × 10-4mm/
Year.It thus uses safely in the environment of temperature is less than 100 degree 20 years or more and occurs without apparent oxidative phenomena.For core
The fields such as heap, medical radiation course shielding, nuclear waste disposal can effectively ensure the safe operation of nuclear reactor system, improve
The system operation service life.The lead lithium alloy is in fusion process because the weight for volatilizing and forming the reasons such as clinker and losing exists
1.6wt.% or so.
Embodiment 3
A kind of resistance to oxidation lead containing Sr lithium alloy in 390 degree of meltings with extremely low work hardening rate.By weight percentage, alloy
Chemical composition be：Li: 1.5wt.%,Sr:0.3wt.%,Pt:0.2wt.%,Ag:0.6wt.%, Mo:0.5wt.%, Pr:
0.3wt.%, surplus are lead.The preparation method of alloy：As above the raw material matched is added in the electric induction furnace of atmosphere protection, and
Using silicon carbide crucible；Sensing heating forms alloy solution, and be sufficiently stirred 10 minutes left sides using electromagnetic agitation effect to 390 degree
It is right；Alloy liquid is stood to be cast to after ten minutes in the same level equipment of heat top in 390 degree of heat preservations and carries out semi-continuous casting into institute
The slab ingot needed, ingot casting move down speed as 12m/min.The slab ingot can regard the pressure rolling that rolling embryo material is used for subsequent handling
To prepare more thin lead lithium alloy plank.The last heat treatment procedure of these planks is：Vacuum solid solution handles 214 degree, and 2.9 is small
When；Vacuum aging handles 138 degree, 1.4 hours.
The lead lithium alloy processing performance is very excellent, and cutting speed can be 2.5 times of universal shield material metal.
At room temperature, the tensile strength of the alloy reaches 304MPa.And tensile strength of traditional shielding material with metal at room temperature
Respectively 230-250MPa.The material has extremely low work hardening ability, can not have intermediate heat-treatment in the operation of rolling
Or prolonged room temperature Recovery and recrystallization and by every time under 38% the amount of rolling the thickness of final plank is rolled down to initially
The 2-8% of thickness.And general shielding material metal due to intensity is big and work hardening rate is higher.It must be by room temperature
Reply under Recovery and recrystallization or high temperature is softened.Under 100 degree, the oxidation rate of the material is 3.2 × 10-4mm/
Year.It thus uses safely in the environment of temperature is less than 100 degree 20 years or more and occurs without apparent oxidative phenomena.For core
The fields such as heap, medical radiation course shielding, nuclear waste disposal can effectively ensure the safe operation of nuclear reactor system, improve
The system operation service life.The lead lithium alloy is in fusion process because the weight for volatilizing and forming the reasons such as clinker and losing exists
1.4wt.% or so.
Claims (3)
1. a kind of resistance to oxidation lead containing Sr lithium alloy with extremely low work hardening rate；According to weight percent, the ingredient of the alloy
For：Li: 1.2-1.6wt.%,Sr:0.2-0.6wt.%,Pt:0.2-0.4wt.%,Ag:0.5-0.8wt.%, Mo:0.4-
0.6wt.%, Pr:0.2-0.4wt.%, surplus are lead.
2. there is resistance to oxidation lead containing the Sr lithium alloy of extremely low work hardening rate according to claim 1, it is characterised in that including
Following steps：As above the raw material matched is added in the electric induction furnace of atmosphere protection, and using silicon carbide crucible；Sensing heating
Alloy solution is formed, and be sufficiently stirred 10 minutes or so using electromagnetic agitation effect to 350-400 degree；By alloy liquid in 350-
400 degree of heat preservations, which stand to be cast to after ten minutes in the same level equipment of heat top, carries out semi-continuous casting into required slab ingot, ingot casting
Speed is moved down as 10-15m/min.
3. there is resistance to oxidation lead containing the Sr lithium alloy of extremely low work hardening rate according to claim 1, it is characterised in that include
Following procedure of processing：The slab ingot can regard rolling embryo material and be closed for the pressure rolling of subsequent handling to prepare more thin lead lithium
Golden plate material；The last heat treatment procedure of these planks is：Vacuum solid solution handles 214 degree, 2.9 hours；Vacuum aging processing 138
Degree, 1.4 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810124714.1A CN108179313A (en) | 2018-02-07 | 2018-02-07 | Resistance to oxidation lead containing Sr lithium alloy with extremely low work hardening rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810124714.1A CN108179313A (en) | 2018-02-07 | 2018-02-07 | Resistance to oxidation lead containing Sr lithium alloy with extremely low work hardening rate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108179313A true CN108179313A (en) | 2018-06-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810124714.1A Withdrawn CN108179313A (en) | 2018-02-07 | 2018-02-07 | Resistance to oxidation lead containing Sr lithium alloy with extremely low work hardening rate |
Country Status (1)
| Country | Link |
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| CN (1) | CN108179313A (en) |
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2018
- 2018-02-07 CN CN201810124714.1A patent/CN108179313A/en not_active Withdrawn
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Application publication date: 20180619 |