CN102358926A - Method for improving sizes, distribution and shapes of Al3Ti particles in aluminum-titanium-boron alloy - Google Patents
Method for improving sizes, distribution and shapes of Al3Ti particles in aluminum-titanium-boron alloy Download PDFInfo
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- CN102358926A CN102358926A CN2011101136289A CN201110113628A CN102358926A CN 102358926 A CN102358926 A CN 102358926A CN 2011101136289 A CN2011101136289 A CN 2011101136289A CN 201110113628 A CN201110113628 A CN 201110113628A CN 102358926 A CN102358926 A CN 102358926A
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Abstract
The invention relates to the technical field of preparation of aluminum-titanium-boron alloys, in particular to a method for improving the sizes, distribution and shapes of Al3Ti particles in an aluminum-titanium-boron alloy. The method comprises the following specific steps of: A, loading an ordinary common aluminum-titanium-boron alloy in which the average size of original Al3Ti particles is about 50 mum into a corundum crucible, spreading a covering agent, and putting into a box-type resistance furnace which is pre-heated to 1,100 DEG C; B, rapidly heating the box-type resistance furnace to 1,200-1,250 DEG C, and preserving heat for 30-35 minutes; and C, rapidly pouring the smelted alloy into a copper mold and rapidly pressing an upper mold cover to obtain the aluminum-titanium-boron alloy in which the average size of the Al3Ti particles is about 6 mum. In the invention, the aluminum-titanium-boron alloy in which the Al3Ti particles are refined and the shapes and distribution of the Al3Ti particles are improved is obtained according to the rapid solidifying principle with a quick copper mold cooling method by mainly controlling the smelting temperature and heat preserving time of the alloy and adopting pouring and pressing methods, so that the refining capabilities of the aluminum-titanium-boron alloy on aluminum and aluminum alloys are improved.
Description
Technical field
The present invention relates to the Al-Ti-B alloy preparing technical field, more particularly, relate to a kind of Al in the Al-Ti-B alloy that improves
3The method of Ti particle size, distribution and pattern.
Background technology
Al-Ti-B intermediate alloy is as present the most widely used aluminium and duraluminum fining agent; Its grain refining efficiency gains universal acceptance already, yet along with industrial development, the performance requriements of aluminium and duraluminum is also improved constantly; Traditional Al-Ti-B alloy is because it plays the particle Al of one of refining effect
3The Ti particle have size big, distribute inadequately evenly and mostly pattern is shortcomings such as strip, cause the Al-Ti-B alloy grain refining efficiency limited, hindered the further raising of aluminium and alloy property thereof; Aluminium titanium carbon master alloy newly developed though grain refining efficiency is superior to aluminium titanium boron, and does not have " fining agent poisoning " phenomenon; But because its complicated process of preparation, cost are higher; Therefore and the solubleness of carbon in molten aluminium is lower, and is difficult to form effective refinement particle TiC, fails widespread production to use; Meanwhile, the novel aluminum of " traditional fining agent+rare earth " and aluminum grain refiner also are in the laboratory study stage.
The Malin of Southern Yangtze University points out in its academic dissertation " the detailed performance research of Al-Ti-B grain-refining agent ": adopt difference to prepare Al-Ti-B intermediate alloy with the salt order, mix with Al in the Al-Ti-B intermediate alloy of salt preparation
3The Ti particle size is minimum, uses the α-Al size after this Al-Ti-B intermediate alloy refinement also minimum; People such as Liu Xiang Fa of Shandong University are at " TiAl in the Al-Ti master alloy
3Form and to the influence of thinning effect " draw in the literary composition: the Al of different shape
3Ti has different thinning effects, the block Al of rapid solidification
3Ti grain refine best results.
Show thus, necessary the conventional aluminum Ti-B alloy is improved, reduce Al
3The Ti particle size is improved its distribution situation and pattern, to satisfy the requirements at the higher level to aluminium and the proposition of duraluminum grain refining efficiency.
Summary of the invention
The present invention is for solving Al in the existing Al-Ti-B alloy
3The Ti particle size is big, distribution is even inadequately and mostly pattern is strip and causes the limited problem of Al-Ti-B alloy grain refining efficiency, aims to provide a kind of Al in the Al-Ti-B alloy that improves
3The method of Ti particle size, distribution and pattern.
The technical scheme that the present invention is taked for solution prior art problem is: through a kind of Al in the Al-Ti-B alloy that improves is provided
3The method of Ti particle size, distribution and pattern, concrete steps are following:
A, on Al-Ti-B alloy, sprinkle insulating covering agent, put into and be warmed up to 1100 ℃ chamber type electric resistance furnace in advance;
B, chamber type electric resistance furnace is rapidly heated 1200～1250 ℃ carries out melting, be incubated 30～35 minutes;
C, melted alloy is poured in the copper mold fast, and pressed the copper mold loam cake rapidly, thereby obtain Al
3The Ti particle mean size is about 6 μ m, and petal-shaped and blocky Al
3Ti accounts for Al
3Al-Ti-B alloy in 65%～75% scope of Ti total volume fraction.
Original Al in the Al-Ti-B alloy in the said steps A
3The Ti particle mean size is about 50 μ m and be strip.
Insulating covering agent in the said steps A is that massfraction is the pressed powder that the NaCl uniform mixing of 50% KCl and 50% is formed, and prevents the scaling loss of alloy, reduces the generation of oxide compound, purifies melt.
Temperature rise rate among the said step B 10 ℃/more than the min.
Among the said step C, require to use copper mold, adopt quick pressing to improve Al-Ti-B alloy as the cast model.
Used insulating covering agent is the uniform mixture of analytical pure chemical reagent KCl and NaCl, it is toasted down at 300 ℃ removed crystal water in 5 hours, presses mass ratio 1:1 uniform mixing then, is stored in greater than keeping dry in 100 ℃ the thermostatic drying chamber in order to using.
Copper mold when compacting, note pouring into the speed of alloy liquid and the golden liquid of pressing, require the alloy liquid cooling but speed 10
2～10
4In the K/s scope, to guarantee Al-Ti-B alloy liquid rapid solidification, the purpose of pressing gold liquid is for alloy liquid is cooled off fully.Just poured the alloy liquid in the copper mold into, the one side that contacts with copper mold almost moment just solidified, but alloy liquid inside and top are still liquid, therefore with the copper mold loam cake press to fast alloy liquid can make alloy liquid apace, fully solidify concrete operations such as Fig. 1.
Compared to prior art, the invention has the beneficial effects as follows: the present invention success refinement Al
3The Ti particle, making it is that 50 μ m are reduced to about 6 μ m by original mean sizes; The present invention has improved Al
3The Ti particulate distributes, the Al after the refinement
3The Ti particle is distributed in the aluminum substrate more uniformly; The present invention has improved Al
3Ti particulate pattern becomes better petal-shaped of thinning effect and bulk by the primary strip, and then improves the grain refining efficiency of Al-Ti-B alloy.
Description of drawings
Fig. 1 is cold pressing the soon synoptic diagram of method for making of the copper mold that adopts among the present invention;
Fig. 2 is original aluminum titanium boron and the XRD comparison diagram that uses the inventive method improvement Al-Ti-B alloy afterwards;
Fig. 3 is the SEM figure of original aluminum Ti-B alloy tissue;
Fig. 4 is to use the inventive method to improve Al-Ti-B alloy afterwards and organizes SEM figure.
Embodiment
To combine accompanying drawing and case study on implementation that the present invention is further specified below:
At first, with original Al
3The Ti particle mean size is packed in the corundum crucible about 50 μ m and for the general commonly used Al-Ti-B alloy of strip; Evenly sprinkle insulating covering agent; The thermostatic drying chamber of putting into 101 ℃ is put into and is warmed up to 1100 ℃ chamber type electric resistance furnace in advance, subsequently after dry 30 minutes; Chamber type electric resistance furnace is raised to 1250 ℃ with the temperature rise rate of 12 ℃/min, is incubated 35 minutes; At last, as shown in Figure 1, melted alloy is poured in the copper mold fast, and pressed the mould loam cake rapidly, thereby obtain Al
3The Ti particle mean size about 6 μ m and major part be petal-like Al-Ti-B alloy.
Adopt Al-Ti-B alloy after the improvement that above-mentioned embodiment obtains, detect through XRD, with the XRD figure spectrum contrast of original aluminum Ti-B alloy, as shown in Figure 2: as to find that material composition does not change, be mainly base aluminum, Al
3Ti particle and TiB
2Particle.
The Al-Ti-B alloy that adopts above-mentioned embodiment to obtain detects through SEM, with the SEM picture contrast of original aluminum Ti-B alloy, like Fig. 3 and shown in Figure 4: Al in the original aluminum Ti-B alloy
3The Ti particle mean size is about 50 μ m, and mostly pattern is strip, and it is even inadequately to distribute; Al after the improvement
3The Ti particle mean size is about 6 μ m, and mostly pattern is petal-shaped and bulk, wherein block Al
3The Ti volume(tric)fraction accounts for Al
350%～60% of Ti total volume fraction, a small amount of strip Al
3The Ti volume(tric)fraction accounts for Al
325%～35% of Ti total volume fraction, and uniform distribution.
Claims (6)
1. one kind is improved Al in the Al-Ti-B alloy
3The method of Ti particle size, distribution and pattern is characterized in that:
A, on Al-Ti-B alloy, sprinkle insulating covering agent, put into and be warmed up to 1100 ℃ chamber type electric resistance furnace in advance;
B, chamber type electric resistance furnace is rapidly heated 1200～1250 ℃ carries out melting, be incubated 30～35 minutes;
C, melted alloy is poured in the copper mold fast, and pressed the copper mold loam cake rapidly, thereby obtain Al
3The Ti particle mean size is about 6 μ m, and petal-shaped and blocky Al
3Ti accounts for Al
3Al-Ti-B alloy in 65%～75% scope of Ti total volume fraction.
2. a kind of Al in the Al-Ti-B alloy that improves as claimed in claim 1
3The method of Ti particle size, distribution and pattern is characterized in that: the original Al in the Al-Ti-B alloy in the said steps A
3The Ti particle mean size is about 50 μ m and be strip.
3. a kind of Al in the Al-Ti-B alloy that improves as claimed in claim 1
3The method of Ti particle size, distribution and pattern; It is characterized in that: the insulating covering agent in the said steps A is that massfraction is the pressed powder that the NaCl uniform mixing of 50% KCl and 50% is formed; Be used to prevent the scaling loss of alloy, reduce the generation of oxide compound, purify melt.
4. a kind of Al in the Al-Ti-B alloy that improves as claimed in claim 1
3The method of Ti particle size, distribution and pattern is characterized in that: the temperature rise rate among the said step B 10 ℃/more than the min.
5. a kind of Al in the Al-Ti-B alloy that improves as claimed in claim 3
3The method of Ti particle size, distribution and pattern; It is characterized in that: used insulating covering agent is the uniform mixture of analytical pure chemical reagent KCl and NaCl; It is toasted 5 hours removal crystal water down at 300 ℃; Press mass ratio 1:1 uniform mixing then, be stored in greater than keeping dry in 100 ℃ the thermostatic drying chamber in order to using.
6. a kind of Al in the Al-Ti-B alloy that improves as claimed in claim 1
3The method of Ti particle size, distribution and pattern is characterized in that: copper mold when compacting, make the alloy liquid cooling but speed 10
2～10
4In the K/s scope, to guarantee Al-Ti-B alloy liquid rapid solidification.
?
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| CN2011101136289A CN102358926A (en) | 2011-05-04 | 2011-05-04 | Method for improving sizes, distribution and shapes of Al3Ti particles in aluminum-titanium-boron alloy |
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| CN2011101136289A CN102358926A (en) | 2011-05-04 | 2011-05-04 | Method for improving sizes, distribution and shapes of Al3Ti particles in aluminum-titanium-boron alloy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820663A (en) * | 2013-11-05 | 2014-05-28 | 常州大学 | Preparation method for fine Al3Ti particles-dispersed aluminum-base intermediate alloy |
| CN110129625A (en) * | 2019-05-23 | 2019-08-16 | 河北工业大学 | TiC-TiB2The preparation method of/Al composite inoculant |
| CN113373340A (en) * | 2021-05-31 | 2021-09-10 | 西北工业大学 | Preparation method of Al-Nb-B refiner master alloy for casting aluminum-silicon alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62133037A (en) * | 1985-12-04 | 1987-06-16 | Ngk Insulators Ltd | Alloy for grain refining and its manufacture |
-
2011
- 2011-05-04 CN CN2011101136289A patent/CN102358926A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62133037A (en) * | 1985-12-04 | 1987-06-16 | Ngk Insulators Ltd | Alloy for grain refining and its manufacture |
Non-Patent Citations (2)
| Title |
|---|
| 朱正锋: "Al-Ti-B中间合金的制备及其细化性能的研究", 《中国优秀博硕士学位论文全文数据库（硕士）工程科技Ⅰ辑》, no. 04, 31 December 2004 (2004-12-31), pages 022 - 82 * |
| 杨阳等: "AlTiB中间合金中TiAl3形态的遗传和变异", 《铸造》, no. 6, 30 June 1997 (1997-06-30), pages 9 - 12 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820663A (en) * | 2013-11-05 | 2014-05-28 | 常州大学 | Preparation method for fine Al3Ti particles-dispersed aluminum-base intermediate alloy |
| CN103820663B (en) * | 2013-11-05 | 2016-04-13 | 常州大学 | A kind of acquisition Al 3the preparation method of Ti particle small and dispersed contained aluminium-base intermediate alloy |
| CN110129625A (en) * | 2019-05-23 | 2019-08-16 | 河北工业大学 | TiC-TiB2The preparation method of/Al composite inoculant |
| CN110129625B (en) * | 2019-05-23 | 2020-06-09 | 河北工业大学 | TiC-TiB2Preparation method of/Al composite inoculant |
| CN113373340A (en) * | 2021-05-31 | 2021-09-10 | 西北工业大学 | Preparation method of Al-Nb-B refiner master alloy for casting aluminum-silicon alloy |
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Application publication date: 20120222 |