CN1936043A - Magnesium alloy refining agent concurrently having fining and refining action and its use method - Google Patents
Magnesium alloy refining agent concurrently having fining and refining action and its use method Download PDFInfo
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- CN1936043A CN1936043A CN 200610054501 CN200610054501A CN1936043A CN 1936043 A CN1936043 A CN 1936043A CN 200610054501 CN200610054501 CN 200610054501 CN 200610054501 A CN200610054501 A CN 200610054501A CN 1936043 A CN1936043 A CN 1936043A
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Abstract
The invention relates to a magnesium alloy refiner and the method of application. It contains 10-50wt% graphite powder, 20-40wt% strontium carbonate, 10-30wt% CeF, 1-10wt% TiC, and 5-10wt% C2Cl6. After taking the process of heating, dehydrating, mixing according to the ratio to equal, pressing to molding, it could be sealed to use. The technology includes the following steps: after the magnesium alloy melting in crucible, heating to 700-720 degree centigrade and removing the slag, pressing the refiner into alloy liquid to take refining process for 10-15 minutes, standing for 5-10 minutes after process to gain magnesium alloy melt. The invention simplifies melt process technology, lowers cost and improves the capability of alloy.
Description
Technical field:
The present invention relates to a kind of magnesium alloy refiner.
Technical background:
Modern society, the energy and environmental problem become the focus that people pay close attention to day by day.In order to cut down the consumption of energy, reduce the environmental pollution that vehicle exhaust causes, the lightweight of automobile becomes one of target that each big automobile vendor of the world does one's utmost to pursue.And magnesium alloy is as light-weight structural timber, because of its have light specific gravity, specific tenacity specific rigidity height, damping vibration attenuation fall dry ability strong, can electromagnetic radiation shielding and be easy to advantage such as recycling, make it be particularly suitable for the application in the vehicles such as automobile, motorcycle and fields such as computer, communication, instrument and military affairs, be described as 21 century " green structured material ".Since the nineties in 20th century, the application of magnesium alloy in world's automotive industry be just with the speed increment in every year about 20%, but at present both at home and abroad the mechanical property of existing magnesium alloy etc. also be difficult to satisfy current and conveying mechanical parts such as automobile, aircraft industrial expansion requirement from now on.Therefore, people just study magnesium alloy from aspects such as alloying constituent optimization, thinning processing and thermal treatments, in the hope of improving its comprehensive mechanical property.And in improving the various technological measures of magnesium alloy mechanical property, the key that the crystal grain by thinning processing refinement magnesium alloy is considered to improve the magnesium alloy comprehensive mechanical property and improves its quality.Generally speaking, effect is mainly reflected in following several respects to the magnesium alloy Effect on Performance in grain refining: 1. because magnesium alloy is the close-packed hexagonal crystalline structure, have only three independently slip systems under the room temperature, the plastic deformation ability of alloy is relatively poor, grain size is more more remarkable than the alloy of body-centered cubic or face-centered cubic crystal structure to the influence of mechanical property, and tiny crystal grain then helps to improve the mechanical property and the plastic deformation ability of alloy; 2. because the magnesium alloy crystallization range is wide, thermal conductivity is lower, body shrinks bigger, the grain coarsening tendency is serious, and in process of setting, easily produce casting flaws such as shrinkage porosite, hot tearing, tiny crystal grain then helps to reduce hot tearing and casting flaw such as loose, thereby the performance of alloy is improved; 3. tiny product grain helps to shorten in the alloy casting state tissue on the product circle solid solution diffusion lengths of alloy phase when thermal treatment such as Mg17Al12, thereby heat treatment of alloy efficient is improved.In addition, tiny crystal grain also helps to improve the corrosion resistance nature and the processing characteristics of magnesium alloy.Also see the improvement effect of thinning processing just, therefore given to pay close attention to widely and attention highly for the thinning processing research of magnesium alloy both at home and abroad always for the magnesium alloy performance.
Document " metallurgy and material transactions (Metallurgical and Materials Transactions; 2000; 31A:2895) " and " casting (Foundry; 2005; 54 (4): 315) " crystal fining method of magnesium alloy is studied and summarized, the main at present crystal grain that adopts following method to come the refinement magnesium alloy is proposed: 1) melt overheat method, soon alloy melt is superheated in a certain temperature range that is higher than fusing point and after the time of insulation than weak point, is cooled fast to teeming temperature and casts; 2) melt paddling process promptly applies strong external force to reach the purpose of crystal grain thinning by modes such as high-intensity magnetic field, ultrasonic wave or mechanical stirring to alloy melt; 3) in containing aluminum magnesium alloy, add carbonaceous material (as lime carbonate, magnesiumcarbonate, graphite granule and dim etc.) or feed carbonaceous gas (as carbonic acid gas, acetylene and Sweet natural gas); 4) add other alloying elements, as zirconium (Zr) and calcium (Ca) etc.Yet above method exists different problems respectively and makes its application be subjected in various degree restriction.Owing to magnesium alloy fused mass need be heated to high temperature, increased the oxidational losses and the inspiratory capacity of magnesium alloy liquation as the melt overheat method, increased the consumption of energy and crucible, and, be unfavorable for separate impurities because the density of impurity and melt alloy all reduces.In addition, the increase of iron-holder also can reduce the corrosion resistance of alloy greatly.There are problems such as technology inconvenience or complicated operation in the melt paddling process; In containing aluminum magnesium alloy, add carbonaceous material or feed carbonaceous gas when needing to contain in the alloy 0.5% above aluminium, just can play effective refining effect.In addition, zirconium is owing to lost efficacy refining effect with aluminum element reaction in the magnesium alloy, so it is inapplicable to the most of magnesium alloy except that Mg-Zn-(Y), adds calcium and then causes alloy thermal fragmentation defect to occur easily in castingprocesses.Also, cause the application of above-mentioned these magnesium alloy refining methods all to be subjected to restriction to a certain degree, thereby influenced the large-scale application of magnesium alloy just because of the problem of above-mentioned existence.
Summary of the invention:
The objective of the invention is to overcome the deficiency of aforesaid method, propose a kind ofly can carry out efficient refinement, and also have the magnesium alloy refiner and the using method thereof of refining effect simultaneously magnesium alloy.
The present invention is in the following manner for realizing above-mentioned purpose.
A kind of magnesium alloy refiner that has refining and refining effect simultaneously, its composition range is (weight percent): 10～50% Graphite Powder 99s (particle diameter is not more than 50 microns), 20～40% Strontium carbonate powder SrCO
3, 10～30% cerium fluoride CeF, 1～10% powdery titanium carbide TiC (particle diameter is not more than 100 microns), 5～10% hexachloroethane C
2Cl
6
The weight percent of each composition is preferably 40～50% Graphite Powder 99s, 20～30% Strontium carbonate powder SrCO
3, 10～20% cerium fluoride CeF, 2～4% powdery titanium carbide TiC, 6～8% hexachloroethane C
2Cl
6
The acting as of each component in this fining agent: Strontium carbonate powder mainly plays refining effect, and it is mainly by reaction displaces the Sr unit with refining effect and usually realizes with alloy melt; Cerium fluoride also has effects such as refining degasification and slagging-off except playing refining effect; Titanium carbide mainly plays refining effect, its mainly when becoming alloy graining the forming core core realize; Graphite Powder 99 mainly plays refining effect; Hexachloroethane mainly plays refining degasification and slagging-off effect, and in addition, the bubble that itself and the reaction of magnesium alloy liquation produce can also play stirring action to alloy liquid.
The production method that has the magnesium alloy refiner of refining and refining effect simultaneously provided by the invention is: starting material are heated to 100～150 ℃ at first respectively remove moisture content in baking oven, take by weighing starting material then by weight percentage; At room temperature the starting material that will take by weighing by weight percentage (inserting machinery in the wet pan) mix; The composite modifying-refining agent that mixes is pressed into the cylindric of φ 45 * 80mm with pressing machine, seals up for safekeeping with aluminium foil then, treat to use when magnesium alloy refining is handled.
The use technology that has the magnesium alloy refiner of refining and refining effect simultaneously provided by the invention is: under flux or gas shield melting condition, skim be warmed up to 700～720 ℃ after magnesium alloy melted in crucible after, between 730～750 ℃, 1～10% fining agent that accounts for the alloy charging weight after the preheating is pressed into the refining and the thinning processing of carrying out in the alloy liquid 10～15 minutes rapidly with bell jar then; Leave standstill after disposing and to get the good magnesium alloy fused mass of thinning effect in 5～10 minutes.
Fining agent provided by the invention has significant advantage, this fining agent is integrated the refining treatment and the thinning processing of magnesium alloy, simplified the melt treatment of magnesium alloy, reduced cost, and confirm through a large amount of experiments and production practice, have extraordinary refining and thinning effect, improved the performance of alloy.
Embodiment:
Below by five specific embodiments technical scheme of the present invention is further described.
Embodiment 1:
The composition of fining agent (weight percent): 40% Graphite Powder 99 (particle diameter is not more than 50 microns), 30% Strontium carbonate powder (SrCO
3), 20% cerium fluoride (CeF), 3% powdery titanium carbide (TiC) (particle diameter is not more than 100 microns), 7% hexachloroethane (C
2Cl
6).
The production method of fining agent: at first respectively starting material are heated to 100～150 ℃ and remove moisture content in baking oven, take by weighing starting material then by mass percentage; At room temperature the starting material that will take by weighing are by mass percentage inserted mechanically mixing in the small-sized wet pan; The composite modifying-refining agent that mixes is pressed into the cylindric of φ 45 * 80mm with pressing machine, seals up for safekeeping with aluminium foil then, treat to use when magnesium alloy refining is handled.
During use, under flux or gas shield melting condition, skim be warmed up to 700 ℃ after magnesium alloy melted in crucible after; Between 730～750 ℃, 7% fining agent that accounts for the alloy charging weight after the preheating is pressed into the refining and the thinning processing of carrying out in the alloy liquid 10 minutes rapidly with bell jar then; Drag for slag after disposing, leave standstill then and can get the good magnesium alloy fused mass of thinning effect in 5 minutes.Be used for AZ91 (Mg-9Al-1Zn-0.1Mn) magnesium alloy, the inclusion in the alloy melt is removed substantially, and average grain size is 82um, and the room temperature tensile strength of metal mold sample is that 189MPa, unit elongation are 3.2%.
Embodiment 2:
The composition of fining agent (weight percent): 50% Graphite Powder 99 (particle diameter is not more than 50 microns), 30% Strontium carbonate powder (SrCO
3), 10% cerium fluoride (CeF), 4% powdery titanium carbide (TiC) (particle diameter is not more than 100 microns), 6% hexachloroethane (C
2Cl
6).
The production method of fining agent: at first respectively starting material are heated to 100～150 ℃ and remove moisture content in baking oven, take by weighing starting material then by mass percentage; At room temperature the starting material that will take by weighing are by mass percentage inserted mechanically mixing in the small-sized wet pan; The composite modifying-refining agent that mixes is pressed into the cylindric of φ 45 * 80mm with pressing machine, seals up for safekeeping with aluminium foil then, treat to use when magnesium alloy refining is handled.
During use, under flux or gas shield melting condition, skim be warmed up to 700 ℃ after magnesium alloy melted in crucible after; Between 730～750 ℃, 6% fining agent that accounts for the alloy charging weight after the preheating is pressed into the refining and the thinning processing of carrying out in the alloy liquid 10 minutes rapidly with bell jar then; Drag for slag after disposing, leave standstill then and can get the good magnesium alloy fused mass of thinning effect in 5 minutes.Be used for AZ91 (Mg-9Al-1Zn-0.1Mn) magnesium alloy, the inclusion in the alloy melt is removed substantially, and average grain size is 85um, and the room temperature tensile strength of metal mold sample is that 185MPa, unit elongation are 3%.
Embodiment 3:
The composition of fining agent (weight percent): 50% Graphite Powder 99 (particle diameter is not more than 50 microns), 25% Strontium carbonate powder (SrCO
3), 15% cerium fluoride (CeF), 5% powdery titanium carbide (TiC) (particle diameter is not more than 100 microns), 5% hexachloroethane (C
2Cl
6).
The production method of fining agent: at first respectively starting material are heated to 100～150 ℃ and remove moisture content in baking oven, take by weighing starting material then by mass percentage; At room temperature the starting material that will take by weighing are by mass percentage inserted mechanically mixing in the small-sized wet pan; The composite modifying-refining agent that mixes is pressed into the cylindric of φ 45 * 80mm with pressing machine, seals up for safekeeping with aluminium foil then, treat to use when magnesium alloy refining is handled.
During use, under flux or gas shield melting condition, skim be warmed up to 700 ℃ after magnesium alloy melted in crucible after; Between 730～750 ℃, 8% fining agent that accounts for the alloy charging weight after the preheating is pressed into the refining and the thinning processing of carrying out in the alloy liquid 10 minutes rapidly with bell jar then; Drag for slag after disposing, leave standstill then and can get the good magnesium alloy fused mass of thinning effect in 5 minutes.Be used for AZ91 (Mg-9A1-1Zn-0.1Mn) magnesium alloy, the inclusion in the alloy melt is removed substantially, and average grain size is 80um, and the room temperature tensile strength of metal mold sample is that 192MPa, unit elongation are 3.5%.
Embodiment 4:
The composition of fining agent (weight percent): 45% Graphite Powder 99 (particle diameter is not more than 50 microns), 25% Strontium carbonate powder (SrCO
3), 16% cerium fluoride (CeF), 8% powdery titanium carbide (TiC) (particle diameter is not more than 100 microns), 6% hexachloroethane (C
2Cl
6).
The production method of fining agent: at first respectively starting material are heated to 100～150 ℃ and remove moisture content in baking oven, take by weighing starting material then by mass percentage; At room temperature the starting material that will take by weighing are by mass percentage inserted mechanically mixing in the small-sized wet pan; The composite modifying-refining agent that mixes is pressed into the cylindric of φ 45 * 80mm with pressing machine, seals up for safekeeping with aluminium foil then, treat to use when magnesium alloy refining is handled.
During use, under flux or gas shield melting condition, skim be warmed up to 720 ℃ after magnesium alloy melted in crucible after; Between 730～750 ℃, 4% fining agent that accounts for the alloy charging weight after the preheating is pressed into the refining and the thinning processing of carrying out in the alloy liquid 10 minutes rapidly with bell jar then: drag for slag after disposing, leave standstill then and can get the good magnesium alloy fused mass of thinning effect in 5 minutes.Be used for AM60 (Mg-6Al-0.22Zn-0.25Mn) magnesium alloy, the inclusion in the alloy melt is removed substantially, and average grain size is 89um, and the room temperature tensile strength of metal mold sample is that 190MPa, unit elongation are 3%.
Embodiment 5:
The composition of fining agent (weight percent): 40% Graphite Powder 99 (particle diameter is not more than 50 microns), 20% Strontium carbonate powder (SrCO
3), 20% cerium fluoride (CeF), 12% powdery titanium carbide (TiC) (particle diameter is not more than 100 microns), 8% hexachloroethane (C
2Cl
6).
The production method of fining agent: at first respectively starting material are heated to 100～150 ℃ and remove moisture content in baking oven, take by weighing starting material then by mass percentage: at room temperature the starting material that will take by weighing are by mass percentage inserted mechanically mixing in the small-sized wet pan; The composite modifying-refining agent that mixes is pressed into the cylindric of φ 45 * 80mm with pressing machine, seals up for safekeeping with aluminium foil then, treat to use when magnesium alloy refining is handled.
During use, under flux or gas shield melting condition, skim be warmed up to 720 ℃ after magnesium alloy melted in crucible after; Between 730～750 ℃, 5% fining agent that accounts for the alloy charging weight after the preheating is pressed into the refining and the thinning processing of carrying out in the alloy liquid 10 minutes rapidly with bell jar then; Drag for slag after disposing, leave standstill then and can get the good magnesium alloy fused mass of thinning effect in 5 minutes.Be used for ZA84 (Mg-8Zn-4Al-0.25Mn) magnesium alloy, the inclusion in the alloy melt is removed substantially, and average grain size is 78um, and the room temperature tensile strength of metal mold sample is that 191MPa, unit elongation are 8%.
Claims (5)
1, a kind of magnesium alloy refiner that has refining and refining effect simultaneously, it is made up of following component in percentage by weight: 10～50% Graphite Powder 99s, 20～40% Strontium carbonate powder SrCO
3, 10～30% cerium fluoride CeF, 1～10% powdery titanium carbide TiC, 5～10% hexachloroethane C
2Cl
6Above-mentioned raw materials is added heat abstraction moisture content respectively earlier, take by weighing by weight percentage, mix, extrusion forming is again sealed up for safekeeping stand-by.
2,1 described magnesium alloy refiner as requested, it is characterized in that: the weight percent of each composition is 40～50% Graphite Powder 99s, 20～30% Strontium carbonate powder SrCO
3, 10～20% cerium fluoride CeF, 2～4% powdery titanium carbide TiC, 6～8% hexachloroethane C
2Cl
6
3,1 or 2 described magnesium alloy refiners as requested, it is characterized in that: the particle diameter of described Graphite Powder 99 is not more than 50 microns, and the particle diameter of powdery titanium carbide TiC is not more than 100 microns.
4, magnesium alloy refiner according to claim 1 and 2 is characterized in that: the extrusion forming of fining agent is to be pressed into cylindricly with pressing machine, seals up for safekeeping with aluminium foil then.
5, the using method of claim 1 or 2 described magnesium alloy refiners is characterized in that: under flux or gas shield melting condition, skim be warmed up to 700～720 ℃ after magnesium alloy melted in crucible after; Leave standstill after skimming, between 730～750 ℃, 1～10% fining agent that accounts for the alloy charging weight after the preheating is pressed into the refining and the thinning processing of carrying out in the alloy liquid 10～15 minutes rapidly with bell jar then; Left standstill after disposing 5～10 minutes, and promptly got the good magnesium alloy fused mass of thinning effect.
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|---|---|---|---|
| CNB2006100545013A CN100554458C (en) | 2006-10-14 | 2006-10-14 | A kind of magnesium alloy refiner and using method thereof that has refining and refining effect simultaneously |
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| CNB2006100545013A CN100554458C (en) | 2006-10-14 | 2006-10-14 | A kind of magnesium alloy refiner and using method thereof that has refining and refining effect simultaneously |
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| CN100554458C CN100554458C (en) | 2009-10-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101985713A (en) * | 2010-12-09 | 2011-03-16 | 重庆理工大学 | Method for refining CaMgSn phase in Mg-Sn-Ca series magnesium alloy by adding Sr |
| CN107574325A (en) * | 2017-10-24 | 2018-01-12 | 重庆理工大学 | A kind of preparation method of Mg Ce Mn Sc heat resistance magnesium alloys |
| CN107739947A (en) * | 2017-10-24 | 2018-02-27 | 重庆理工大学 | A kind of Mg Y Mn Sc heat resistance magnesium alloys and preparation method thereof |
| CN112375934A (en) * | 2020-11-25 | 2021-02-19 | 安徽军明机械制造有限公司 | Method for improving mechanical property of AZ31 magnesium alloy by using low-frequency ultrasonic waves |
| CN112981160A (en) * | 2021-02-05 | 2021-06-18 | 山东省科学院新材料研究所 | Composite flux suitable for magnesium-aluminum magnesium alloy and preparation method and application thereof |
-
2006
- 2006-10-14 CN CNB2006100545013A patent/CN100554458C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101985713A (en) * | 2010-12-09 | 2011-03-16 | 重庆理工大学 | Method for refining CaMgSn phase in Mg-Sn-Ca series magnesium alloy by adding Sr |
| CN107574325A (en) * | 2017-10-24 | 2018-01-12 | 重庆理工大学 | A kind of preparation method of Mg Ce Mn Sc heat resistance magnesium alloys |
| CN107739947A (en) * | 2017-10-24 | 2018-02-27 | 重庆理工大学 | A kind of Mg Y Mn Sc heat resistance magnesium alloys and preparation method thereof |
| CN107574325B (en) * | 2017-10-24 | 2019-05-03 | 重庆理工大学 | A kind of preparation method of Mg-Ce-Mn-Sc heat resistance magnesium alloy |
| CN112375934A (en) * | 2020-11-25 | 2021-02-19 | 安徽军明机械制造有限公司 | Method for improving mechanical property of AZ31 magnesium alloy by using low-frequency ultrasonic waves |
| CN112375934B (en) * | 2020-11-25 | 2022-04-26 | 安徽军明机械制造有限公司 | Method for improving mechanical property of AZ31 magnesium alloy by using low-frequency ultrasonic waves |
| CN112981160A (en) * | 2021-02-05 | 2021-06-18 | 山东省科学院新材料研究所 | Composite flux suitable for magnesium-aluminum magnesium alloy and preparation method and application thereof |
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|---|---|
| CN100554458C (en) | 2009-10-28 |
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