CN101376933A - Flux for smelting rare-earth-contained magnesium alloy and production method thereof - Google Patents
Flux for smelting rare-earth-contained magnesium alloy and production method thereof Download PDFInfo
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- CN101376933A CN101376933A CNA2008101413398A CN200810141339A CN101376933A CN 101376933 A CN101376933 A CN 101376933A CN A2008101413398 A CNA2008101413398 A CN A2008101413398A CN 200810141339 A CN200810141339 A CN 200810141339A CN 101376933 A CN101376933 A CN 101376933A
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Abstract
The invention belongs to the field of metal materials and metallurgy, and provides flux used to melt magnesium alloy containing rare earth; the mass percentage of the flux is as follows: 20 percent to 30 percent of magnesium chloride, 35 percent to 45 percent of potassium chloride, 10 percent to 15 percent of sodium chloride, 10 percent to 15 percent of lithium chloride, and 5 percent to 10 percent of sodium carbonate. The production method comprises the following steps: the magnesium chloride, the potassium chloride, the sodium chloride and the lithium chloride are mixed by the mass percentage and dried for more than 20 hours at 70 DEG C to 100 DEG C; and then the carbonate is added in the dried mixture, mechanically mixed for more than 12 hours in a planetary mill, and then put into a closed container for stand-by. The flux developed by the invention is used to melt magnesium alloy containing rare earth, and can serve as covering agent and refining agent in melting. The flux can greatly reduce the loss of rare earth elements in melting, has quite good adhesion capability of containing non-metal, simple and convenient production method, and low cost. The flux is also applicable to the magnesium alloy not containing rare earth.
Description
Technical field
The invention belongs to metallic substance and metallurgical class field, relate generally to a kind of flux and production method thereof that is used for smelting rare-earth-contained magnesium alloy, prevent the oxidizing fire of alloy liquid as the insulating covering agent in the smelting rare-earth-contained magnesium alloy process with secluding air, and the refining agent in the refining process is used for removing the non-metallic inclusion of smelting rare-earth-contained magnesium alloy process.
Background technology
Magnesium alloy is the lightest structural metallic materials during present engineering is used, and its density only is 23% of steel, 64% of aluminium alloy; Magnesium alloy has high specific rigidity and specific tenacity, good damping and amortization and damping property, good electromagnetic shielding, anti-electromagnetic interference performance.Magnesium alloy is at automobile, and the application on the motorcycle can reach " energy-saving and emission-reduction " purpose, and magnesium alloy is easy to be beneficial to environmental protection, therefore is described as 21 century " green structured material ".At present various countries generally pay attention to the development of magnesium alloy, and magnesium alloy is at defence and military, aerospace, and automobile and electronics and information industry have very wide application prospect.
The room temperature strength of traditional magnesium alloy is not high, and the high-temperature behavior difference has seriously hindered the use of magnesium alloy on some high temperature, key components and parts, becomes the extensive bottleneck that uses of restriction magnesium-alloy material.For the room temperature strength and the high-temperature behavior that improve magnesium alloy, the scientific research personnel has done number of research projects, has developed a series of new magnesium alloy.A large amount of RE elements that studies show that not only can improve the intensity of the castability of magnesium alloy and magnesium alloy effectively but also can increase substantially the high-temperature behavior of magnesium alloy, the use temperature of magnesium-alloy material can be brought up to 200-300 ℃ by room temperature.Current, the effect of rare earth element in high-strength magnesium alloy and heat resistance magnesium alloy obtained numerous scientific research personnel's attention.Some Heat Resistant Rare Earth-magnesium Alloy has realized the application in industry, as EK41, QE22, EQ21, WE54, WE43.
Magnesium alloy is oxidizing fire very easily at high temperature, so need alloy is protected in the fusion process of magnesium alloy, flux protection still has a wide range of applications in industry now as a kind of traditional magnesium alloy smelting mode.Flux except playing the oxidizing fire that secluding air prevents liquid magnesium alloy, also uses as scouring agent in fusion process, purifies alloy melt to remove the non-metallic inclusion that generates owing to oxidation.Traditional magnesium alloy adopts RJ2 type flux to carry out melting mostly.RJ2 type flux major ingredients mass percent is: 45% magnesium chloride, 37% Repone K, 8% sodium-chlor, 4% Calcium Fluoride (Fluorspan), 6% bariumchloride.Magnesium chloride (MgCl
2) meeting and O in fusion process
2, H
2O reacts and form H on the liquid level of magnesium alloy
2With the HCl protective atmosphere, the oxidation that liquid level has been delayed in resistance.In addition, Ye Tai MgCl
2To the MgO in the magnesium alloy fused mass, Mg
3N
2Deng nonmetal inclusion good wettability is arranged, the ability of stronger removal oxide inclusion is arranged, thereby be the main component of most of magnesium alloy flux.But when the melting magnesium-rare earth, because the active chemical of rare earth element is easy to take place to answer 2[RE with magnesium chloride]+3MgCl
2(l)=2RECl
3(s)+and Mg (l), thus make expensive rare earth element in fusion process, lose, make the content of the rare earth element in the alloy reduce greatly.Some flux at the magnesium-rare earth melting of having developed at present, owing to added valuable components such as Calcium Fluoride (Fluorspan), rare earth compound, price is higher.Therefore, the magnesium-rare earth flux of developing a kind of cheapness is significant.
Summary of the invention
The objective of the invention is to propose a kind of simple, convenient, cheap flux that is used for smelting rare-earth-contained magnesium alloy and production method thereof at the deficiency of existing magnesium alloy flux; This kind flux is mainly used in fire-resisting protection and the refining treatment in the smelting rare-earth-contained magnesium alloy process; When magnesium alloy smelting, not only can be used as insulating covering agent and used but also can be used as refining agent and use, also can be used as insulating covering agent and refining agent uses simultaneously; In fusion process, can play oxidizing fire that prevents magnesium alloy fused mass and the effect that purifies magnesium alloy fused mass removal oxide inclusion and can reduce the loss of rare earth element in fusion process greatly again.
In order to achieve this end, the present invention adjusts the mass percent of the main component of flux on the basis of existing RJ type flux, has introduced two kinds of new constituent elements simultaneously; The composition of flux of the present invention and mass percent are: 20%-30% magnesium chloride, 35%-45% Repone K, 10%-15% sodium-chlor, 10%-15% lithium chloride, 5%-10% yellow soda ash.
Traditional RJ type flux can cause a large amount of losses of rare earth element when the melting rare-earth-contained magnesium alloy.The major cause that causes the rare earth element loss is that the content of magnesium chloride in the RJ type flux is very high, and feasible expensive rare earth loses in a large number in the flux thereby meeting of adding rare earth element and magnesium chloride generation rare earth chloride enter.But the magnesium chloride in the flux has the ability of the oxide inclusion of stronger removal, thereby magnesium chloride is the basic constituent element of magnesium alloy flux.Therefore the present invention has reduced the mass percent of magnesium chloride in flux.The viscosity of Repone K and surface tension are all smaller, and the content that has increased Repone K can reach viscosity and the capillary purpose that reduces after the flux melts, and flux is easy to make flux that the better protecting effect be arranged at the surface spreading of alloy liquid.The existence of Calcium Fluoride (Fluorspan) can make the viscosity of flux, and the increase of flux viscosity is unfavorable for wetting between flux and liquid level, is unfavorable for the deslagging of alloy liquid; Bariumchloride and sodium-chlor all can make the density of flux increase, magnesium alloy density is little, if the density difference between alloy and the flux is too small, can reduce the flux flame retardant effect, when casting, make flux be difficult to separate simultaneously, make flux sneak into and cause new being mingled with in the mold with alloy liquid.Therefore, under the condition that increases sodium chloride content a little, do not add bariumchloride make the viscosity of flux reduce and increased flux and alloy liquid between density difference, guarantee that flux and alloy liquid can be separated preferably when casting.The continuous decomposition of the carbonate that adds meeting in the process of melting discharges carbon dioxide makes the insulating covering agent show bubble be difficult for sinking, and has reduced the usage quantity of insulating covering agent.When can diluting melting, the carbon dioxide that discharges simultaneously, improved the melting environment by the obnoxious flavoures such as HCl that muriate discharged.When using this flux to use as refining agent, the gas that flux discharged can increase the adsorptive power of flux to nonmetal inclusion, simultaneously alloy liquid is had the effect of physics degasification, thereby has strengthened the affinability of refining agent.
Different with traditional flux production method, the production method of flux of the present invention is: magnesium chloride, Repone K, sodium-chlor, lithium chloride are simply mixed back (artificial blending) by mass percentage, dry more than 20 hours in loft drier under 70-100 ℃ of temperature, adding carbonate then, mixes the back and uses dry airtight containers store standby more than 12 hours in ground and mixed on the planetary ball mill.
When flux uses as insulating covering agent, when magnesium alloy is heated to 550 ℃ in crucible, sprinkle insulating covering agent uniformly on the surface of magnesium alloy.As long as using priciple is for can guarantee that magnesium alloy is not oxidized, few as far as possible using.When the process of magnesium alloy from semi-molten to fusing otherwise the time the surface to magnesium alloy spread a spot of insulating covering agent and can access protection timely with the unsalted surface that guarantees just to have exposed, using priciple is the same.By the time can form one deck densification after magnesium alloy melts fully on the surface of alloy liquid, the protective membrane of white can play the purpose that secluding air prevents the liquid magnesium alloy oxidizing fire; When flux uses as refining agent, adopt the flux of the 1%-10% that is equivalent to the furnace charge gross weight that liquid magnesium alloy is carried out refining treatment.When treating that alloy liquid reaches refining temperature, flux is immersed alloy liquid inside rapidly with soft steel spoon splendid attire, and stir the soft steel spoon up and down, make the alloy liquid recycle stream moving, with the chance that contact absorption of the nonmetal inclusion in the increase alloy liquid with refining agent, refining time is 5-15 minute, and to guarantee nonmetal can fully absorption by refining agent, it is oxidized once more to prevent alloy liquid to spread a small amount of insulating covering agent in the liquid level benefit after the refining treatment.Usually need to leave standstill processing after the refining treatment, the time is 20-30 minute.
Flux provided by the present invention has overcome the limitation of the flux of previous use, not only can be used for melting to contain the magnesium alloy of rare earth, and is suitable equally to the melting of common magnesium alloy.Owing to adjusted magnesium chloride, Repone K, sodium-chlor mass percent, introduced lithium chloride, carbonate simultaneously and made the rare earth recovery rate in the magnesium alloy after the melting be greatly improved.The adding of carbonate simultaneously makes the refining effect of flux be improved and has played the effect that improves the melting environment.And the production method of flux provided by the present invention is novel and simple, convenient, and flux do not contain rare component, and is cheap.
Embodiment
Below by specific embodiment technical scheme of the present invention is further described following examples and does not constitute limitation of the invention.
Embodiment 1
The flux component that is used for smelting rare-earth-contained magnesium alloy: 20% magnesium chloride, 45% Repone K, 15% sodium-chlor, 15% lithium chloride, 5% yellow soda ash.
The production method of flux: it is dry more than 20 hours in loft drier under 70-100 ℃ of temperature that magnesium chloride, Repone K, sodium-chlor, lithium chloride are simply mixed back (artificial blending) by mass percentage, add yellow soda ash in ground and mixed on the planetary ball mill more than 12 hours, sieve with 100 mesh sieves, standby with dry airtight containers store.
Use this flux melting to add the AZ31B magnesium alloy of rare earth neodymium, when magnesium alloy is heated to 550 ℃ in the soft steel crucible, sprinkle insulating covering agent uniformly on the surface of magnesium alloy.The process of magnesium alloy from semi-molten to fusing however the time the surface to magnesium alloy spread a spot of insulating covering agent and can access protection timely with the unsalted surface that guarantees just to have exposed.During refining, adopt the flux of the 1%-10% that is equivalent to the furnace charge gross weight to carry out refining treatment.In the time of 720 ℃, flux is immersed alloy liquid inside rapidly with soft steel spoon splendid attire, and stir the soft steel spoon up and down, make the alloy liquid recycle stream moving, refining time is 10 minutes, to guarantee nonmetal can fully absorption by refining agent, spreads a small amount of insulating covering agent in the liquid level benefit after the refining treatment.Leave standstill processing after the refining treatment, the time is 30 minutes.The as cast condition tensile strength of alloy is σ
b=190MPa, the recovery rate of rare earth neodymium is more than 80%.
Embodiment 2
The flux component that is used for smelting rare-earth-contained magnesium alloy: 28% magnesium chloride, 40% Repone K, 15% sodium-chlor, 10% lithium chloride, 7% yellow soda ash.
The production method of flux: it is dry more than 20 hours in loft drier under 70-100 ℃ of temperature that magnesium chloride, Repone K, sodium-chlor, lithium chloride are simply mixed back (artificial blending) by mass percentage, add yellow soda ash in ground and mixed on the planetary ball mill more than 12 hours, sieve with 100 mesh sieves, standby with dry airtight containers store.
Use this flux melting to add the AZ31B magnesium alloy of rare earth cerium, when magnesium alloy is heated to 550 ℃ in the soft steel crucible, sprinkle insulating covering agent uniformly on the surface of magnesium alloy.The process of magnesium alloy from semi-molten to fusing however the time the surface to magnesium alloy spread a spot of insulating covering agent and can access protection timely with the unsalted surface that guarantees just to have exposed.During refining, adopt the flux of the 1%-10% that is equivalent to the furnace charge gross weight to carry out refining treatment.In the time of 720 ℃, flux is immersed alloy liquid inside rapidly with soft steel spoon splendid attire, and stir the soft steel spoon up and down, make the alloy liquid recycle stream moving, refining time is 5 minutes, to guarantee nonmetal can fully absorption by refining agent, spreads a small amount of insulating covering agent in the liquid level benefit after the refining treatment.Leave standstill processing after the refining treatment, the time is 30 minutes.The as cast condition tensile strength of alloy is σ
b=186MPa, the recovery rate of rare earth cerium is between 79%-82%.
Embodiment 3
The flux component that is used for smelting rare-earth-contained magnesium alloy: 30% magnesium chloride, 35% Repone K, 10% sodium-chlor, 15% lithium chloride, 10% yellow soda ash.
The production method of flux: it is dry more than 20 hours in loft drier under 70-100 ℃ of temperature that magnesium chloride, Repone K, sodium-chlor, lithium chloride are simply mixed back (artificial blending) by mass percentage, add yellow soda ash in ground and mixed on the planetary ball mill more than 12 hours, sieve with 100 mesh sieves, standby with dry airtight containers store.
Use this flux melting AZ91 magnesium alloy, when magnesium alloy is heated to 550 ℃ in the soft steel crucible, sprinkle insulating covering agent uniformly on the surface of magnesium alloy.The process of magnesium alloy from semi-molten to fusing however the time the surface to magnesium alloy spread a spot of insulating covering agent and can access protection timely with the unsalted surface that guarantees just to have exposed.During refining, adopt the flux of the 1%-10% that is equivalent to the furnace charge gross weight to carry out refining treatment.In the time of 720 ℃, flux is immersed alloy liquid inside rapidly with soft steel spoon splendid attire, and stir the soft steel spoon up and down, make the alloy liquid recycle stream moving, refining time is 10 minutes, to guarantee nonmetal can fully absorption by refining agent, spreads a small amount of insulating covering agent in the liquid level benefit after the refining treatment.Leave standstill processing after the refining treatment, the time is 30 minutes.The as cast condition tensile strength of alloy is σ
b=195MPa, unit elongation δ=6%.
Claims (2)
1, a kind of flux that is used for smelting rare-earth-contained magnesium alloy, it is characterized in that: the composition of flux and mass percent are: 20%-30% magnesium chloride, 35%-45% Repone K, 10%-15% sodium-chlor, 10%-15% lithium chloride, 5%-10% yellow soda ash.
2, a kind of production method of the flux that is used for smelting rare-earth-contained magnesium alloy of claim 1, it is characterized in that: after magnesium chloride, Repone K, sodium-chlor, lithium chloride are mixed by mass percentage, dry more than 20 hours under 70-100 ℃ the temperature condition, and then carbonate joined in the dry mixture, in mechanically mixing on the planetary ball mill more than 12 hours, the airtight containers for future use of packing into after the mixing.
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|---|---|---|---|
| CN2008101413398A CN101376933B (en) | 2008-09-11 | 2008-09-11 | Flux for smelting rare-earth-contained magnesium alloy and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101413398A CN101376933B (en) | 2008-09-11 | 2008-09-11 | Flux for smelting rare-earth-contained magnesium alloy and production method thereof |
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|---|---|
| CN101376933A true CN101376933A (en) | 2009-03-04 |
| CN101376933B CN101376933B (en) | 2010-09-29 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560164A (en) * | 2012-01-14 | 2012-07-11 | 台州职业技术学院 | Fusion agent for smelting of magnesium alloy containing rare earth yttrium and preparation method thereof |
| CN102690963A (en) * | 2012-05-16 | 2012-09-26 | 北京有色金属研究总院 | Flux used for recycling magnesium alloy cuttings, and preparation method and application method thereof |
| CN103215468A (en) * | 2013-04-19 | 2013-07-24 | 扬州峰明金属制品有限公司 | Rear-earth magnesium alloy smelting agent and preparation method thereof |
| CN103215460A (en) * | 2013-05-13 | 2013-07-24 | 西南大学 | Slag conglomeration agent for treating magnesium and magnesium alloy |
| CN103382525A (en) * | 2013-06-21 | 2013-11-06 | 燕山大学 | Magnesium alloy smelting protective fluxing agent and preparation method thereof |
| CN105349816A (en) * | 2015-11-30 | 2016-02-24 | 贵州航天风华精密设备有限公司 | Magnesium alloy smelting protection solvent and preparation method thereof |
| CN113106275A (en) * | 2021-04-09 | 2021-07-13 | 河北大有镁业有限责任公司 | Continuous production method of high-quality multi-element rare earth magnesium alloy with controllable end point component |
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| CN102851519B (en) * | 2011-07-01 | 2015-04-22 | 湖南晟通科技集团有限公司 | Novel aluminum refining agent, and preparation method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560164A (en) * | 2012-01-14 | 2012-07-11 | 台州职业技术学院 | Fusion agent for smelting of magnesium alloy containing rare earth yttrium and preparation method thereof |
| CN102560164B (en) * | 2012-01-14 | 2013-08-21 | 台州职业技术学院 | Fusion agent for smelting of magnesium alloy containing rare earth yttrium and preparation method thereof |
| CN102690963A (en) * | 2012-05-16 | 2012-09-26 | 北京有色金属研究总院 | Flux used for recycling magnesium alloy cuttings, and preparation method and application method thereof |
| CN102690963B (en) * | 2012-05-16 | 2014-12-10 | 北京有色金属研究总院 | Flux used for recycling magnesium alloy cuttings, and preparation method and application method thereof |
| CN103215468A (en) * | 2013-04-19 | 2013-07-24 | 扬州峰明金属制品有限公司 | Rear-earth magnesium alloy smelting agent and preparation method thereof |
| CN103215468B (en) * | 2013-04-19 | 2015-01-14 | 扬州峰明金属制品有限公司 | Rear-earth magnesium alloy smelting agent and preparation method thereof |
| CN103215460A (en) * | 2013-05-13 | 2013-07-24 | 西南大学 | Slag conglomeration agent for treating magnesium and magnesium alloy |
| CN103215460B (en) * | 2013-05-13 | 2014-07-30 | 西南大学 | Slag conglomeration agent for treating magnesium and magnesium alloy |
| CN103382525A (en) * | 2013-06-21 | 2013-11-06 | 燕山大学 | Magnesium alloy smelting protective fluxing agent and preparation method thereof |
| CN105349816A (en) * | 2015-11-30 | 2016-02-24 | 贵州航天风华精密设备有限公司 | Magnesium alloy smelting protection solvent and preparation method thereof |
| CN113106275A (en) * | 2021-04-09 | 2021-07-13 | 河北大有镁业有限责任公司 | Continuous production method of high-quality multi-element rare earth magnesium alloy with controllable end point component |
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| CN101376933B (en) | 2010-09-29 |
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