CN103382525B - Magnesium alloy smelting protective fluxing agent and preparation method thereof - Google Patents
Magnesium alloy smelting protective fluxing agent and preparation method thereof Download PDFInfo
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- CN103382525B CN103382525B CN201310249831.8A CN201310249831A CN103382525B CN 103382525 B CN103382525 B CN 103382525B CN 201310249831 A CN201310249831 A CN 201310249831A CN 103382525 B CN103382525 B CN 103382525B
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Abstract
A magnesium alloy smelting protective fluxing agent comprises the chemical components, by mass: 8-15% of barium carbonate, 12-20% of calcium sulfate, 10-18% of calcium carbonate, 12-15% of magnesium chloride, 12-20% of magnesium nitrate, 12-20% of magnesium carbonate, 1-5% of lithium chloride and 1-5% of a rare earth oxide. A preparation method of the smelting protective fluxing agent mainly comprises the steps: respectively drying the above raw materials at the temperature of 170-210 DEG C to dehydrate; then after mixing the dried raw materials, putting into a ball mill, milling into a powdery matter, wherein the average particle size of the powdery matter is less than 10 [mu]m; and after sieving the powdery matter, filling into a sealed container for standby application. The magnesium alloy smelting protective fluxing agent has the advantages of simple processes, low cost, good flame retardant performance and excellent high-temperature protective effect, and can effectively reduce harmful gas emissions.
Description
Technical field
The invention belongs to metallic substance and metallurgical class field, particularly a kind of melting protecting flux and preparation method thereof.
Background technology
Magnesium alloy is as the lightest Engineering Metal Structure material, there is light specific gravity, specific tenacity and specific rigidity are high, damping and amortization and machinability are good, thermal conductivity is good, electromagnetic shielding ability is strong and vibration damping is good and be easy to the advantage reclaiming, meet aviation, space flight, modern automobile industry is to loss of weight, energy-conservation requirement, and alternative engineering plastics are to meet 3C(computer, communication, consumer electronics) product light, thin, miniaturization, the requirement of high integration and environmental protection aspect, become the preferred material of Hyundai Motor and 3C industry, be described as " green engineering material of 21 century ".
But poor corrosion resisting property and high chemically reactive, become the two large major technique bottlenecks that restriction magnesium alloy is applied already.For a long time, in magnesium alloy smelting protection, people have done a large amount of work, prevent oxidation and the burning of magnesium liquid, but solve not yet well up to now.Oxidizable and the combustion problem of magnesium alloy in fusion process is the key that hinders magnesium alloy smelting technology and Processing Technology Development, badly influences development and the application of magnesium alloy materials.
Current, the guard method of magnesium alloy in fusion process mainly contains: gas protection method and flux protection method.
Gas protection method is implemented the minimum that affects the simplest and on cast properties.The seventies in last century so far, with SF
6gas be representative gas shield technology be the magnesium alloy flame-proof guard method that magnesium industry circle generally adopts always.But the caused environmental problem of Greenhouse effect causes people's concern day by day.SF
6be a kind of serious greenhouse gases, its Greenhouse effect are about CO
223900 times, SF
6life cycle estimate to reach 3200, and can havoc ozonosphere.Therefore, international Mei Ye association (IMA) realizes SF before being determined at 2015
6zero release (Cashion S P et.al.Journal of Light Metals, 2002; 1:37).
Flux protection method is exactly in fusion process, at magnesium bath surface covering flux, to the refining of magnesium liquid, to removing gas and the oxide inclusion in magnesium liquid.The flux generally using is now by anhydrous carnallite (MgCl
2-KCl) be some fluorochemicals of main interpolation, muriate composition, this flux is wanted remelting dehydration before using, being added to magnesium liquid when surface changes into wateryly immediately, discharges the people's that chokes smell, contaminate environment simultaneously, the serious corrosion of factory building, operator's respiratory tract occupational illness is many, and in addition, this flux slaggability is low, poor with the separation property of magnesium melt, easily entrain into formation flux in magnesium melt and be mingled with.The feature of the foamed magnesium alloy covering agent (CN1122112C) of Shanghai Communications University is that this insulating covering agent in use produces rare gas element bubble, and its protective value is better than traditional flux, but the protection effect under its high temperature is undesirable.The feature of the magnesium of Shanghai Communications University and the fire-retardant covering flux of magnesium alloy complex protection and production method (CN1208481C) thereof is complex protection; improve insulating covering agent in protection effect at high temperature; although but adding of beryllide improved flame retardant properties; but cause alloy grain thick, can fall low-alloyed mechanical property.
Summary of the invention:
The object of the present invention is to provide the magnesium alloy smelting protecting flux that a kind of technique is simple, with low cost, flame retardant properties is good, high temperature protection effect is good.
The chemical composition mass percent of magnesium alloy smelting protecting flux of the present invention is: barium carbonate 8-15%, calcium sulfate 12-20%, calcium carbonate 10-18%, magnesium chloride 12-15%, magnesium nitrate 12-20%, magnesiumcarbonate 12-20%, lithium chloride 1-5% and rare earth oxide 1-5%.Described rare earth oxide comprises: one or more in lanthanum trioxide, cerium oxide, the rich cerium of the rich lanthanum of oxidation, when multiple, each oxide components mass percent is equal to.
The preparation method of above-mentioned magnesium alloy smelting protection flux:
(1) by above-mentioned raw materials at 170-210 DEG C of drying and dewatering respectively;
(2) be milled into powdery by putting into ball mill after the raw material mixing of above-mentioned oven dry, its average particle size particle size is less than 10 μ m;
(3) after above-mentioned meal is sieved, pack in encloses container for subsequent use.
When use, above-mentioned magnesium alloy smelting protection flux is sprinkling upon on magnesium surface, in stove, temperature is higher than after 500 DEG C, protection flux melts gradually, and produces the bubble that diameter is 2-3mm, along with temperature continues to raise, flux melts and drawout on magnesium liquid surface rapidly, and oxidizing fire does not occur magnesium.The at high temperature sustainable 3h of this protection effect.
The present invention compared with prior art tool has the following advantages:
1, technique is simple, with low cost.
2, in use, can not introduce alloying element, and improve the burning-point of magnesium alloy, make it obtain good flame retardant properties.
3, high-temperature behavior is good, under hot conditions, (is greater than 500 DEG C), and it is liquid that flux melts becomes, and spreads out on alloy or magnesium liquid surface, plays the effect of isolated air.Meanwhile, foaming substance decomposes is emitted gas, makes flux float over magnesium liquid surface on the one hand, on the other hand, also plays the effect of oxygen in isolated air.
4, reduce the discharge of obnoxious flavour, reach the object of environmental protection.
5, melting slagging-off is effective.
Embodiment:
Embodiment 1
Get barium carbonate 8kg, calcium sulfate 20kg, calcium carbonate 18kg, magnesium chloride 12kg, magnesium nitrate 20kg, magnesiumcarbonate 20kg, lithium chloride 1kg, be oxidized the rich cerium 1kg of rich lanthanum.By above-mentioned raw materials respectively at 170 DEG C of drying and dewaterings; After again the raw material of above-mentioned oven dry being mixed, put into ball mill and be milled into the powdery that average particle size particle size is less than 10 μ m; After above-mentioned meal is sieved, be prepared into magnesium alloy smelting protecting flux, and packed in encloses container for subsequent use.
When use, sprinkle above-mentioned magnesium alloy smelting protection flux at magnesium surface, in stove, temperature is higher than after 500 DEG C, protection flux melts gradually, and produces the bubble that diameter is 2mm, along with temperature continues to raise, flux is melting and drawout on magnesium liquid surface rapidly, and oxidizing fire does not occur magnesium.At high temperature this protection effect continues 3h.
Embodiment 2
Get barium carbonate 15kg, calcium sulfate 20kg, calcium carbonate 18kg, magnesium chloride 15kg, magnesium nitrate 12kg, magnesiumcarbonate 12kg, lithium chloride 3kg, lanthanum trioxide 2.5kg, cerium oxide 2.5kg.By above-mentioned raw materials respectively at 200 DEG C of drying and dewaterings; After again the raw material of above-mentioned oven dry being mixed, put into ball mill and be milled into the powdery that average particle size particle size is less than 10 μ m; After above-mentioned meal is sieved, be prepared into magnesium alloy smelting protecting flux, and packed in encloses container for subsequent use.
When use, sprinkle above-mentioned magnesium alloy smelting protection flux at magnesium surface, temperature is higher than after 500 DEG C in stove, protection flux melts gradually, and the bubble that generation diameter is 2.5mm, along with temperature continues to raise, flux melts and drawout on liquid magnesium alloy surface rapidly, and oxidizing fire does not occur magnesium alloy.At high temperature this protection effect continues 3h.
Embodiment 3
Get barium carbonate 15kg, calcium sulfate 12kg, calcium carbonate 10kg, magnesium chloride 15kg, magnesium nitrate 20kg, magnesiumcarbonate 20kg, lithium chloride 5kg, lanthanum trioxide 1kg, cerium oxide 1kg, be oxidized the rich cerium 1kg of rich lanthanum.By above-mentioned raw materials respectively at 180 DEG C of drying and dewaterings; After again the raw material of above-mentioned oven dry being mixed, put into ball mill and be milled into the powdery that average particle size particle size is less than 10 μ m; After above-mentioned meal is sieved, be prepared into magnesium alloy smelting protecting flux, and packed in encloses container for subsequent use.
When use, sprinkle above-mentioned magnesium alloy smelting protection flux at magnesium surface, temperature is higher than after 500 DEG C in stove, protection flux protection flux melts gradually, and the bubble that generation diameter is 3mm, along with temperature continues to raise, flux is melting and drawout on liquid magnesium alloy surface rapidly, and oxidizing fire does not occur magnesium alloy.At high temperature this protection effect continues 3h.
Embodiment 4
Get barium carbonate 12kg, calcium sulfate 18kg, calcium carbonate 15kg, magnesium chloride 14kg, magnesium nitrate 17kg, magnesiumcarbonate 18kg, lithium chloride 3kg, cerium oxide 1.5kg, be oxidized the rich cerium 1.5kg of rich lanthanum.By above-mentioned raw materials respectively at 210 DEG C of drying and dewaterings; After again the raw material of above-mentioned oven dry being mixed, put into ball mill and be milled into the powdery that average particle size particle size is less than 10 μ m; After above-mentioned meal is sieved, be prepared into magnesium alloy smelting protecting flux, and packed in encloses container for subsequent use.
When use, sprinkle above-mentioned magnesium alloy smelting protection flux at magnesium surface, in stove, temperature is higher than after 500 DEG C, protection flux melts gradually, and produces the bubble that diameter is 2mm, along with temperature continues to raise, flux is melting and drawout on magnesium liquid surface rapidly, and oxidizing fire does not occur magnesium.At high temperature this protection effect continues 3h.
Claims (3)
1. a magnesium alloy smelting protecting flux, is characterized in that: its chemical composition mass percent is: barium carbonate 8-15%, calcium sulfate 12-20%, calcium carbonate 10-18%, magnesium chloride 12-15%, magnesium nitrate 12-20%, magnesiumcarbonate 12-20%, lithium chloride 1-5% and rare earth oxide 1-5%.
2. a kind of magnesium alloy smelting protecting flux according to claim 1; it is characterized in that: rare earth oxide contained in described rare earth oxide comprises: one or more in lanthanum trioxide, cerium oxide, the rich cerium of the rich lanthanum of oxidation, when multiple, each oxide components mass percent is equal to.
3. the preparation method of magnesium alloy smelting protecting flux claimed in claim 1, is characterized in that:
(1) by above-mentioned raw materials at 170-210 DEG C of drying and dewatering respectively;
(2) be milled into powdery by putting into ball mill after the raw material mixing of above-mentioned oven dry, the average particle size particle size of its powdery is less than 10 μ m;
(3) after above-mentioned meal is sieved, pack in encloses container for subsequent use.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310249831.8A CN103382525B (en) | 2013-06-21 | 2013-06-21 | Magnesium alloy smelting protective fluxing agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310249831.8A CN103382525B (en) | 2013-06-21 | 2013-06-21 | Magnesium alloy smelting protective fluxing agent and preparation method thereof |
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| Publication Number | Publication Date |
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| CN103382525A CN103382525A (en) | 2013-11-06 |
| CN103382525B true CN103382525B (en) | 2014-10-15 |
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| CN201310249831.8A Expired - Fee Related CN103382525B (en) | 2013-06-21 | 2013-06-21 | Magnesium alloy smelting protective fluxing agent and preparation method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105349816B (en) * | 2015-11-30 | 2017-12-01 | 贵州航天风华精密设备有限公司 | A kind of protection solvent of magnesium alloy smelting and preparation method thereof |
| CN113174505B (en) * | 2021-04-08 | 2022-04-26 | 上海交通大学 | Refining flux for magnesium-lithium alloy and preparation method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122112C (en) * | 2000-09-21 | 2003-09-24 | 上海交通大学 | Foamed magnesium alloy covering agent |
| CN1216170C (en) * | 2003-04-18 | 2005-08-24 | 中南大学 | Fluxing agent for refining magnesium alloy containing rare-earth |
| CN101376933B (en) * | 2008-09-11 | 2010-09-29 | 河南科技大学 | Flux for smelting rare-earth-contained magnesium alloy and production method thereof |
| RU2407813C2 (en) * | 2009-03-18 | 2010-12-27 | Открытое Акционерное Общество "Корпорация Всмпо-Ависма" | Procedure for production of flux for melting and refining magnesium or its alloys |
| 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 |
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- 2013-06-21 CN CN201310249831.8A patent/CN103382525B/en not_active Expired - Fee Related
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