CN1370847A - Al-Pb alloy melt protecting and purifying method - Google Patents
Al-Pb alloy melt protecting and purifying method Download PDFInfo
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- CN1370847A CN1370847A CN 01132217 CN01132217A CN1370847A CN 1370847 A CN1370847 A CN 1370847A CN 01132217 CN01132217 CN 01132217 CN 01132217 A CN01132217 A CN 01132217A CN 1370847 A CN1370847 A CN 1370847A
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- alloy
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Abstract
The Al-Pb alloy protecting and purifying method comprises to add flux containing NaCl, KCL, (La Ce) F3, CaCO3, Na3AlF6 and Na2B4O7 into Al-Pb alloy smelting furnace with the added amount being 0.5-5%. When the flux is used in covering, protecting and purifying, the 10 microns over non-metal inclusion is eliminated from the high temperatur Al-Pb alloy melt, the over 10 microns non-metal inclusion content is reduced to below 0.02 %, hydrogen content is reduced to below 0.15 ml/100g Al, Pb evaporation and burning loss is reduced to below 1 %, and the other performance is raised greatly. The process has obvious melt purifying effect and Al phase and Pb phase fining effect.
Description
What the present invention relates to is a kind of alloy melt protecting and purifying method, and particularly a kind of Al-Pb alloy melt protecting and purifying method belong to the metallic material alloy field of smelting.
Background technology: because Al-Pb alloy has excellent abrasive and seizure resistance, and has self-lubricating function, it is that alloy is used as internal combustion engine bearings such as automobile that this kind alloy will extensively replace aluminium-Xi.Though China is in the research of this kind alloy and produce and obtained huge progress, but because Al-Pb alloy is easy to generate the shortcoming of gravity segregation, thereby in order to eliminate segregation, the alloy melting temp height, usually more than 1000 ℃, in its fusion process, the measure that prevents segregation such as often need to take to stir, so also exist bigger problem: (1) melt oxidation scaling loss is serious, (2) the melt fluctuation causes being involved in the alloy liquid a large amount of oxide inclusions, (3) plumbous volatilization is serious, not only causes the lead content in the alloy to reduce, and contaminate environment seriously, infringement operator's health, (4) melt generally adopts hexachloroethane to carry out purifying treatment as flux, not only can not remove hydrogen and oxide inclusion in the melt fully, and environmental pollution is serious.At present in the melting of this kind alloy and scavenging process, there are not better flux and way, by literature search, " preparation of casting sliding bearing of Al-Pb alloy alloy and microstructure thereof " literary composition in " Special Processes of Metal Castings and non-ferrous alloy ", 1998 (5): 24-26, author: Sun Daren etc., this article is presented in aluminium-lead alloy fusion process, to leave the aperture be φ 10mm seal closure to face shield one on crucible, but the φ 10mm aperture above the sealing cover, can not completely cut off melt contacts with air, can not prevent plumbous volatilization and scaling loss, and inconvenient operation.For the refining of aluminium-lead alloy, there is no and theme same document report of the present invention.
Summary of the invention and embodiment: the method that the invention provides covering protection purification refinement in a kind of Al-Pb alloy fusion process: will contain NaCl, KCl, (La, Ce) F
3, CaCO
3, Na
3AlF
6And Na
2B
4O
7Flux adds the Al-Pb alloy melt smelting furnace, the add-on of flux is 0.5～5%, when furnace charge begins to melt, because the density of flux is less than Al-Pb alloy melt, its fusing point is lower than the fusing point of Al-Pb alloy, do not soak into alloy melt, perhaps wetting capacity is not strong, melt spreads out the surface of alloy melt automatically, form the flux film of one deck densification, the flux film thickness of formation is in 1～100 micrometer range, and this flux film is being kept perfectly under the effect of Al-Pb alloy high-temperature fusant more than 1000 ℃, thereby play secluding air, prevent to inhale the effect of hydrogen and melt oxidation; This antiflux has physics and chemical purification effect to hydrogen and the oxygen that exists in the alloy melt, and the purified product of formation is adsorbed by flux film, and flux film is had strengthening effect; Chemical ingredients in the flux has refining effect with Pb mutually mutually to the Al in the alloy; The various reaction times that this antiflux and melt produce fully and steadily.
In the fusion process, before smelting furnace is reinforced, above-mentioned flux is positioned over furnace bottom, adds furnace charge again, after furnace charge began fusing, because flux density is less than melt, flux was with after melt fully contacts, on float over bath surface, form the flux rete easily.
The present invention can keep fine and close flux rete in order to make flux under the effect of high-temperature fusant, adopted glass ingredient (Na in the flux
2B
4O
7), this glass can be mingled with by adsorption and oxidation, also can adsorb the hydrogen in the melt, also contains rare earth compound composition (La, Ce) F in the flux
3With flux component commonly used as Na
3(AlF)
6, CaF
2, NaCl and KCl etc., wherein rare earth element is displaced, with other composition, the effect of playing protection and purifying.
The present invention has substantive distinguishing features and marked improvement; after adopting this kind flux covering protection to purify; the above nonmetal inclusion (NMI) of 10 μ m in high temperature (1000 ℃) the Al-Pb alloy melt is removed fully; the following nonmetal inclusion content of 10 μ m is lower than 0.02%; hydrogen content can be reduced to the following level of 0.15ml/100gAl; plumbous volatilization and scaling loss amount drop to＜1% level, and other various salient featuress improve greatly.Melt is had significant cleaning action, Al is had refining effect mutually with Pb mutually, and technology is simple, nontoxic.
Embodiment:
| Embodiment | Flux add-on (%) | Performance improves (%) | Refining effect | Plumbous scaling loss amount (%) | Decontamination effect improving | |
| [H](ml/100 ??gAl) | ??NMI(％) | |||||
| ??1 | ??0.5 | ??15 | Good | ??＜1 | ??0.15 | ??＜0.02 |
| ??2 | ??3 | ??20 | Better | ??＜1 | ??0.14 | ??＜0.02 |
| ??3 | ??5 | ??25 | Best | ??＜1 | ??0.12 | ??＜0.02 |
Claims (2)
1, a kind of Al-Pb alloy melt protecting and purifying method is characterized in that and will contain NaCl, KCl, (La, Ce) F
3, CaCO
3, Na
3AlF
6And Na
2B
4O
7Flux adds the Al-Pb alloy melt smelting furnace, and the add-on of flux is 0.5～5%.
2, this Al-Pb alloy melt protecting according to claim 1 and purifying method is characterized in that in the fusion process, before smelting furnace is reinforced, above-mentioned flux are positioned over furnace bottom, add furnace charge again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011322179A CN1162562C (en) | 2001-11-15 | 2001-11-15 | Al-Pb alloy melt protecting and purifying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011322179A CN1162562C (en) | 2001-11-15 | 2001-11-15 | Al-Pb alloy melt protecting and purifying method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1370847A true CN1370847A (en) | 2002-09-25 |
| CN1162562C CN1162562C (en) | 2004-08-18 |
Family
ID=4671255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011322179A Expired - Fee Related CN1162562C (en) | 2001-11-15 | 2001-11-15 | Al-Pb alloy melt protecting and purifying method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1162562C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252073A (en) * | 2018-11-13 | 2019-01-22 | 天津立中合金集团有限公司 | High-strength tenacity aluminium alloy space material and preparation method thereof |
| CN109576523A (en) * | 2018-12-29 | 2019-04-05 | 安徽鑫铂铝业股份有限公司 | A kind of purification method of heat transmission aluminium alloy |
-
2001
- 2001-11-15 CN CNB011322179A patent/CN1162562C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252073A (en) * | 2018-11-13 | 2019-01-22 | 天津立中合金集团有限公司 | High-strength tenacity aluminium alloy space material and preparation method thereof |
| CN109576523A (en) * | 2018-12-29 | 2019-04-05 | 安徽鑫铂铝业股份有限公司 | A kind of purification method of heat transmission aluminium alloy |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1162562C (en) | 2004-08-18 |
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