CN1238544C - Magnesium-manganese intermediate alloy and preparing method thereof - Google Patents
Magnesium-manganese intermediate alloy and preparing method thereof Download PDFInfo
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- CN1238544C CN1238544C CN 03133459 CN03133459A CN1238544C CN 1238544 C CN1238544 C CN 1238544C CN 03133459 CN03133459 CN 03133459 CN 03133459 A CN03133459 A CN 03133459A CN 1238544 C CN1238544 C CN 1238544C
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- magnesium
- crucible
- manganese
- master alloy
- temperature
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Abstract
The present invention relates to a magnesium-manganese master alloy and a preparing method thereof. The magnesium-manganese master alloy comprises 5 to 7 wt% of manganese and magnesium as the rest; the preparing method of the present invention comprises: smelting is carried out in a crucible by a medium-frequency induction furnace, the middle lower part of the crucible is arranged in an induction coil, the middle upper part of the crucible is arranged outside the induction coil, and the upper part and the lower part of the crucible form a temperature gradient; the technical steps comprise: the crucible is preheated to 600 DEG C and then is heated until a magnesium ingot is completely melted after a magnesium ingot is added to the crucible; then, preheated electrolytic manganese is added to the magnesium liquid, and the addition quantity of the manganese is from 5 to 20 wt%; the crucible is rapidly heated until the temperature of the magnesium liquid at the bottom of the crucible reaches 800 DEG C to 900 DEG C, but the temperature of a melt surface layer is controlled to 700 to 750 DEG C; the manganese at the bottom of the crucible is continuously agitated by an agitating rod until the manganese is completely melted and homogenized; surface slag is skimmed, and then the alloy liquid is rapidly filled into a mould and is prepared into the magnesium-manganese master alloy. The method of the present invention enhances the dissolvability and the dissolution rate of the manganese and inhibits the vigorous oxidation of the magnesium melt, and the prepared Mg-Mn master alloy has high quality.
Description
Affiliated technical field
The invention belongs to a kind of magnesium base master alloy and preparation method thereof, particularly some higher toughness and plasticity automobile structure, sports goods and 3C field require the casting of using and the mother alloy of wrought magnesium alloys under corrosive atmosphere.
Background technology
Under as-cast condition, manganese is very weak to the strengthening effect of magnesium alloy, but after viscous deformation, the intensity of alloy is improved to some extent, and mostly belongs to wrought magnesium alloys so Mg-Mn is an alloy.Mg-Mn is the alloy MIA (Mn content is 1.2%) that comprises U.S. ASTM series and MB1 (Mn content is 1.3～2.5%) MB8 (Mn content is 1.5～2.5%, and Ce content is 0.15～0.35%) of Chinese national standard GB/T5153-1985 series.Mg-Mn is that the topmost advantage of alloy is to have good corrosion stability and weldability, especially Mn is easily with detrimental impurity element (as iron) chemical combination, thereby removed the harmful effect of these elements to corrosion stability, make corrosion speed particularly the corrosion speed in seawater reduce greatly.At common magnesium alloy smelting temperature (700 ℃～750 ℃), the solubleness of manganese in magnesium less (≤4%), and also dissolution rate is very slow; In the melting technology of magnesium-manganese alloy, if take the mode of direct manganese addition, often cause smelting time long, the oxidizing fire aggravation, inclusion content increases, and alloy mass descends.
Summary of the invention
The present invention is directed to existing Mg-Mn is the deficiency of alloy and melting and manufacturing technology, and a kind of Mg-Mn master alloy and preparation method thereof is provided.
What the present invention prepared is the higher Mg-Mn master alloy of Mn content, according to the Mg-Mn binary alloy phase diagram, peritectic transformation takes place in the time of 652 ℃: L+ β (Mn) → a sosoloid, under peritectic temperature, Mn is 3.3% in the intravital solubleness of a solid solution, descend with temperature, solid solubility reduces rapidly, and 620 ℃ are w (Mn)=2.06%, 455 ℃ is w (Mn)=0.25%, yet the content of Mn can reach about 5～7% in the Mg-Mn master alloy of employing the present invention preparation.
The preparation method of Mg-Mn master alloy of the present invention, the middle and lower part with crucible when melting places ruhmkorff coil, and then outside ruhmkorff coil, in the top and the bottom of crucible formation temperature gradient, promptly the crucible bottom temperature is the highest, up lapse of temperature in the crucible middle and upper part.Earlier crucible is preheated to about 600 ℃, add purity and be and be warming up to magnesium ingot behind 99.5% the magnesium ingot and melt fully, electrolytic manganese with preheating adds in the magnesium liquid (add-on of manganese can change between 5～20%) again, be rapidly heated to bottom magnesium solution temperature and reach 800 ℃～900 ℃, and the melt skin temperature is controlled at about 700～750 ℃, and upper and lower difference is between 150～200 ℃.Manganese with the continuous stirring crucible of stirring rod bottom melts and homogenizing fully until it.Skim the slag on surface, rapidly alloy liquid is injected mould then, make the Mg-Mn master alloy that difference contains the Mn amount.
Advantage of the present invention is to utilize the coupling of the crucible and the load coil of special shape size, make the magnesium solution formation temperature gradient in the crucible, the solubleness and the dissolution rate of manganese had so both been improved, the vigorous oxidation that has suppressed the magnesium solution again, the Mg-Mn master alloy quality height of preparation, the production efficiency height.
Embodiment
Melting Mg-Mn master alloy adopts medium-frequency induction furnace, the cast steel with high chromium crucible, and the aqueous solution of inner surface of crucible spray zinc oxide, the crucible height is 2～5 times of diameter.During melting, the middle and lower part of crucible places ruhmkorff coil, and then outside ruhmkorff coil, in the upper and lower part of crucible formation temperature gradient, promptly the crucible bottom temperature is the highest, up lapse of temperature in the crucible middle and upper part.Earlier crucible is preheated to about 600 ℃, adding purity is 99.5% magnesium ingot, feeds SF simultaneously
6, CO
2And N
2Mixed gas as shielding gas (SF
6Content be 0.4%, CO
2And N
2The ratio of content be 1: 3) or sprinkle the RJ-2 solvent, and be warming up to magnesium ingot and melt fully, electrolytic manganese with preheating adds in the magnesium liquid again, the add-on of manganese is 5～20% by weight percentage, be rapidly heated to bottom magnesium solution temperature to 800 ℃～900 ℃, simultaneously the melt skin temperature is controlled at below 750 ℃, upper and lower difference is between 150～200 ℃.Manganese with the continuous stirring crucible of stirring rod bottom melts and homogenizing fully until it.Skim the slag on surface, rapidly magnesium liquid is injected mould then.
Claims (4)
1, a kind of magnesium manganese master alloy is characterized in that it is 5～7% that this magnesium manganese master alloy contains the manganese weight percent, and surplus is a magnesium.
2, the preparation method of magnesium manganese master alloy according to claim 1, the melting that it is characterized in that this magnesium manganese master alloy is to carry out in having the crucible of thermograde, its concrete processing step is: crucible is preheated to 600 ℃, is warming up to magnesium ingot behind the adding magnesium ingot and melts fully; Electrolytic manganese with preheating adds in the magnesium liquid again, and the add-on of manganese is 5～20% by weight percentage; Be rapidly heated to bottom magnesium solution temperature to 800 ℃～900 ℃, and the melt skin temperature is controlled at 700～750 ℃; Alloy liquid with the continuous stirring crucible of stirring rod bottom melts and being evenly distributed in alloy liquid fully until manganese; Skim the slag on surface; Rapidly alloy liquid is injected mould and make magnesium manganese master alloy.
3, the preparation method of magnesium manganese master alloy according to claim 2, it is characterized in that described crucible with thermograde is meant the crucible of upper and lower part formation temperature gradient, the crucible bottom temperature is the highest, up lapse of temperature, and the upper and lower temperature head of crucible is 150～200 ℃.
4, the preparation method of magnesium manganese master alloy according to claim 2, it highly is 2～5 times of diameter to it is characterized in that used crucible.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03133459 CN1238544C (en) | 2003-06-17 | 2003-06-17 | Magnesium-manganese intermediate alloy and preparing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03133459 CN1238544C (en) | 2003-06-17 | 2003-06-17 | Magnesium-manganese intermediate alloy and preparing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1470664A CN1470664A (en) | 2004-01-28 |
| CN1238544C true CN1238544C (en) | 2006-01-25 |
Family
ID=34154247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03133459 Expired - Fee Related CN1238544C (en) | 2003-06-17 | 2003-06-17 | Magnesium-manganese intermediate alloy and preparing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1238544C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101289721B (en) * | 2008-06-18 | 2010-11-03 | 重庆大学 | High manganese-containing magnesium-manganese intermediate alloy and preparation |
| CN101381831B (en) * | 2008-10-29 | 2010-06-09 | 仝仲盛 | High plasticity magnesium alloy |
| CN103667838B (en) * | 2014-01-03 | 2016-02-03 | 重庆大学 | Mg-Sn-Mn system wrought magnesium alloy and preparation method thereof |
| CN107326202B (en) * | 2017-07-10 | 2019-04-05 | 周云锋 | A kind of high Mn content magnesium manganese intermediate alloy preparation method and alloy product |
| CN107746981B (en) * | 2017-10-18 | 2020-02-07 | 河北四通新型金属材料股份有限公司 | Preparation method of magnesium-manganese intermediate alloy |
-
2003
- 2003-06-17 CN CN 03133459 patent/CN1238544C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1470664A (en) | 2004-01-28 |
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