CN102690964B - Alterant for hypereutectic aluminum-silicon alloy primary silicon and preparation method thereof - Google Patents
Alterant for hypereutectic aluminum-silicon alloy primary silicon and preparation method thereof Download PDFInfo
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- CN102690964B CN102690964B CN201210194047.7A CN201210194047A CN102690964B CN 102690964 B CN102690964 B CN 102690964B CN 201210194047 A CN201210194047 A CN 201210194047A CN 102690964 B CN102690964 B CN 102690964B
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Abstract
The invention discloses an alterant used for refining hypereutectic aluminum-silicon alloy primary silicon. The alterant comprises 0.1-30 wt% of silicon, 0.001-30 wt% of iron and the balance of aluminum in mass. The invention also discloses a preparation method of the alterant used for refining the hypereutectic aluminum-silicon alloy primary silicon. The method comprises the steps that commercial purity aluminum or high purity aluminum is melted in an intermediate frequency furnace, then weighed commercial purity silicon or high purity silicon and ingot iron are sequentially added, and heating is continued until the components are completely molten. The molten metal is thermally insulated and stirred and then is poured into ingots or made into wires. The alterant for the hypereutectic aluminum-silicon alloy primary silicon contains a nucleation substrate of the primary silicon, and the nucleation rate of the primary silicon is greatly improved, so that the primary silicon is refined. When the alterant is added into hypereutectic aluminum-silicon alloy in a proper proportion, the modification effect on the primary silicon is obvious, and the effect of the alterant is superior to that of the conventional AlP alterant.
Description
Technical field
The invention belongs to metallic substance technical field, relate to a kind of cast Al-Si alloy technology, particularly a kind of transcocrystallized Al-Si alloy primary silicon alterant and preparation method thereof.
Background technology
Transcocrystallized Al-Si alloy is due to its good wear resistance, and the features such as volume stability obtain widespread use in automobile industry.But primary silicon is thick under state of nature, worsen its performance.For the performance need that makes full use of transcocrystallized Al-Si alloy is to the primary silicon processing of going bad, refinement primary silicon size.Traditional method is master alloy or the salt adding in melt containing P element.But add microcosmic salt contaminate environment, complicated containing the preparation of P master alloy, and need insulation for a long time to reach modification effect.
Summary of the invention
The present invention, in order to solve the problems of the technologies described above, provides a kind of transcocrystallized Al-Si alloy primary silicon alterant and preparation method thereof, and this alterant energy refinement primary silicon improves primary silicon nucleation rate.
To achieve these goals, the present invention adopts following technical scheme.
A kind of transcocrystallized Al-Si alloy primary silicon alterant, silicon 0.1-30%, iron 0.001-30%, surplus is aluminium; In mass.
Described transcocrystallized Al-Si alloy primary silicon alterant, preferred version is, silicon 0.1-25%, iron 0.01-25%, surplus is aluminium; In mass.
The preparation method of above-mentioned transcocrystallized Al-Si alloy primary silicon alterant, comprises that step is as follows:
(1) take in mass ratio commercial-purity aluminium or rafifinal, industrial pure silicon or HIGH-PURITY SILICON, technically pure iron raw material;
(2) in smelting furnace, fine aluminium is melted to 700-900 ℃, then adds load weighted industrial pure silicon or HIGH-PURITY SILICON and technically pure iron, continue heating, insulation is to melting completely;
(3) above-mentioned melt is cast into ingot casting or continuous casting and rolling becomes wire rod.
The invention has the beneficial effects as follows, the forming core substrate that transcocrystallized Al-Si alloy primary silicon alterant contains primary silicon, improves the nucleation rate of primary silicon greatly, thus refinement primary silicon.From embodiment and comparative example relatively can find, this alterant is in the time that proper ratio adds in transcocrystallized Al-Si alloy, its modification effect to primary silicon is obvious.And its effect is better than traditional AlP alterant now, in lower than AlP addition, can make primary silicon refine to the state after size goes bad lower than AlP.
Accompanying drawing explanation
Fig. 1 is embodiment 1 naturally cooling metallograph under the opticmicroscope of 500 times in sand mold;
Fig. 2 is embodiment 2 naturally cooling metallograph under the opticmicroscope of 500 times in sand mold;
Fig. 3 is embodiment 3 naturally cooling metallograph under the opticmicroscope of 500 times in sand mold;
Fig. 4 is embodiment 4 naturally cooling metallograph under the opticmicroscope of 500 times in sand mold;
Fig. 5 is embodiment 5 naturally cooling metallograph under the opticmicroscope of 500 times in sand mold;
Fig. 6 is comparative example 1 naturally cooling metallograph under the opticmicroscope of 500 times in sand mold;
Fig. 7 is comparative example 2 naturally cooling metallograph under the opticmicroscope of 500 times in sand mold.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Embodiment 1:
(1) press commercial-purity aluminium 60%, silicon 30%, the mass ratio of iron 10% takes raw material;
(2) fine aluminium melted and be warming up to 850 ℃, then adding load weighted industrial pure silicon and technically pure iron, being stirred to completely and melting;
(3) above-mentioned melt is cast into ingot casting or continuous casting and rolling becomes wire rod.
In intermediate frequency furnace, melt Al-15Si alloy, to fusing completely, the transcocrystallized Al-Si alloy primary silicon alterant that adds the present embodiment to prepare according to the ratio of Al-15Si alloy mass 0.3%, is poured in sand mold according to normal process, and finished product cast organizes pattern under microscope as Fig. 1.
Embodiment 2:
(1) press commercial-purity aluminium 80%, silicon 15%, the mass ratio of iron 5% takes raw material;
(2) fine aluminium melted and be warming up to 850 ℃, then adding load weighted industrial pure silicon and technically pure iron, being stirred to completely and melting;
(3) above-mentioned melt is cast into ingot casting or continuous casting and rolling becomes wire rod.
In intermediate frequency furnace, melt Al-15Si alloy, to fusing completely, the transcocrystallized Al-Si alloy primary silicon alterant that adds the present embodiment to prepare according to the ratio of Al-15Si alloy mass 0.3%, is poured in sand mold according to normal process, and finished product cast organizes pattern under microscope as Fig. 2.
Embodiment 3:
(1) press commercial-purity aluminium 98.8%, silicon 1%, the mass ratio of iron 0.2% takes raw material;
(2) fine aluminium melted and be warming up to 850 ℃, then adding load weighted industrial pure silicon and technically pure iron, being stirred to completely and melting;
(3) above-mentioned melt is cast into ingot casting or continuous casting and rolling becomes wire rod.
In intermediate frequency furnace, melt Al-15Si alloy, to fusing completely, the transcocrystallized Al-Si alloy primary silicon alterant that adds the present embodiment to prepare according to the ratio of Al-15Si alloy mass 0.3%, is poured in sand mold according to normal process, and finished product cast organizes pattern under microscope as Fig. 3.
Embodiment 4:
(1) press commercial-purity aluminium 60%, silicon 10%, the mass ratio of iron 30% takes raw material;
(2) fine aluminium melted and be warming up to 850 ℃, then adding load weighted industrial pure silicon and technically pure iron, being stirred to completely and melting;
(3) above-mentioned melt is cast into ingot casting or continuous casting and rolling becomes wire rod.
In intermediate frequency furnace, melt Al-15Si alloy, to fusing completely, the transcocrystallized Al-Si alloy primary silicon alterant that adds the present embodiment to prepare according to the ratio of Al-15Si alloy mass 0.3%, is poured in sand mold according to normal process, and finished product cast organizes pattern under microscope as Fig. 4.
Embodiment 5:
(1) press commercial-purity aluminium 70%, silicon 10%, the mass ratio of iron 20% takes raw material;
(2) fine aluminium melted and be warming up to 850 ℃, then adding load weighted industrial pure silicon and technically pure iron, being stirred to completely and melting;
(3) above-mentioned melt is cast into ingot casting or continuous casting and rolling becomes wire rod.
In intermediate frequency furnace, melt Al-15Si alloy, to fusing completely, the transcocrystallized Al-Si alloy primary silicon alterant that adds the present embodiment to prepare according to the ratio of Al-15Si alloy mass 0.3%, is poured in sand mold according to normal process, and finished product cast organizes pattern under microscope as Fig. 5.
Comparative example 1:
In intermediate frequency furnace, melt Al-15Si alloy, to fusing completely, do not add any primary silicon alterant, be poured in sand mold according to normal process, the pattern under finished product microscope is as Fig. 4.
Comparative example 2:
In intermediate frequency furnace, melt Al-15Si alloy, to fusing completely, add in mass ratio 1% traditional AlP alterant, be poured in sand mold according to normal process, the pattern under finished product microscope is as Fig. 5.
From embodiment and the last metallographic structure of comparative example medium casting, the successful of transcocrystallized Al-Si alloy primary silicon alterant of the present invention.Can find with comparative example contrast, along with adding of transcocrystallized Al-Si alloy primary silicon alterant of the present invention, the size of primary silicon significantly reduces, and is accompanied by the raising of primary silicon nucleation rate.On the one hand, transcocrystallized Al-Si alloy primary silicon alterant of the present invention acts in low add-on and can show good effect the modifying-refining of primary silicon, on the other hand, compare traditional AlP alterant, transcocrystallized Al-Si alloy primary silicon alterant modification effect of the present invention is better, can make the size of primary silicon compare the size of AlP after rotten less on suitable addition.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (2)
1. a transcocrystallized Al-Si alloy primary silicon alterant, is characterized in that, silicon 0.1-25%, and iron 0.01-25%, surplus is aluminium; In mass; This alterant contains the substrate of primary silicon forming core, and its preparation method comprises that step is as follows:
(1) take in mass ratio commercial-purity aluminium or rafifinal, industrial pure silicon or HIGH-PURITY SILICON, technically pure iron raw material;
(2) in smelting furnace, fine aluminium is melted to 700-900 ℃, then adds load weighted industrial pure silicon or HIGH-PURITY SILICON and technically pure iron, continue heating, insulation is to melting completely;
(3) above-mentioned melt is cast into ingot casting or continuous casting and rolling becomes wire rod.
2. transcocrystallized Al-Si alloy primary silicon alterant as claimed in claim 1, is characterized in that, in described step (2), in smelting furnace, fine aluminium is melted to 750-850 ℃.
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| CN102925764A (en) * | 2012-11-15 | 2013-02-13 | 山东大学 | Dual-modification method of eutectic and hypereutectic aluminum-silicon alloy |
| CN104439206B (en) * | 2014-11-29 | 2017-02-22 | 山东大学 | Application of silicon grain heterogeneous nucleation enhancer in promotion of nucleation of silicon grains in aluminum-silicon alloy melt |
| CN108754195B (en) * | 2018-06-29 | 2020-04-03 | 张家港江苏科技大学产业技术研究院 | Alterant for iron-rich phase alteration in hypereutectic high-iron aluminum silicon alloy and preparation method thereof |
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| CN1471589A (en) * | 2000-10-02 | 2004-01-28 | Preparing aluminium-silicon alloys |
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| CN1471589A (en) * | 2000-10-02 | 2004-01-28 | Preparing aluminium-silicon alloys |
Non-Patent Citations (2)
| Title |
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| 张维维."Al-Si-Fe合金第二相形态控制技术研究".《中国优秀博硕士学位论文全文数据库（硕士） 工程科技Ⅰ辑》.2004,(第3期),表2-2. |
| 张维维."Al-Si-Fe合金第二相形态控制技术研究".《中国优秀博硕士学位论文全文数据库(硕士) 工程科技Ⅰ辑》.2004,(第3期),表2-2. * |
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