JPH1046267A - Method for grain refinement of Al or Al alloy - Google Patents
Method for grain refinement of Al or Al alloyInfo
- Publication number
- JPH1046267A JPH1046267A JP21541296A JP21541296A JPH1046267A JP H1046267 A JPH1046267 A JP H1046267A JP 21541296 A JP21541296 A JP 21541296A JP 21541296 A JP21541296 A JP 21541296A JP H1046267 A JPH1046267 A JP H1046267A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- added
- refining
- present
- crystal grains
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Manufacture And Refinement Of Metals (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
(57)【要約】
【技術課題】 表面特性の厳しいＡｌまたはＡｌ合金鋳
造品の結晶粒を微細化することができるフィルターの目
詰まりの少ないＡｌまたはＡｌ合金の結晶粒微細化方法
を提供し、併せてそのために添加使用されるＡｌ−Ｔｉ
母合金を提供する。
【解決手段】 ＡｌまたはＡｌ合金溶湯に、粒状のＴｉ
を原料とし、９００℃以下で製造されたＡｌ−Ｔｉ母合
金を結晶粒微細化剤として添加することを特徴とするも
のである。すなわち本発明において結晶粒微細化のため
に添加されるＡｌ−Ｔｉ母合金は、原料として粒状のＴ
ｉを使用し、Ｔｉの添加量が２ｗｔ％以下、溶解温度が
９００℃以下として製造してなるものである。
(57) [Technical Problem] [Problem] To provide a method for refining crystal grains of Al or Al alloy with less clogging of a filter capable of refining crystal grains of Al or Al alloy casting having severe surface characteristics, In addition, Al-Ti used for this purpose
Provide mother alloy. SOLUTION: Granular Ti is added to Al or Al alloy melt.
, And adding an Al—Ti master alloy produced at 900 ° C. or lower as a crystal grain refiner. That is, in the present invention, the Al-Ti mother alloy added for refining the crystal grains is made of granular T
Using i, the amount of Ti added is 2 wt% or less, and the dissolution temperature is 900 ° C. or less.
Description
【０００１】[0001]
【発明の属する技術分野】本発明はＡｌまたはＡｌ合金
（以下、単にＡｌまたはアルミニウムと称する）の結晶
粒微細化方法およびそのためにＡｌ溶湯中に添加するに
好適なＡｌ−Ｔｉ母合金に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for refining crystal grains of Al or an Al alloy (hereinafter, simply referred to as Al or aluminum) and an Al-Ti master alloy suitable for being added to an Al melt.
【０００２】[0002]
【従来の技術】アルミニウムの鋳造に際し、鋳造品の結
晶粒微細化を図るため、溶湯中に結晶粒微細化剤とし
て、Ａｌ−Ｔｉ−Ｂ母合金を添加し、ＴｉＢ2またはＴ
ｉＡｌ3の生成により結晶粒を微細化する技術は周知で
ある。近時における表面特性の要求が厳しくなっている
アルミニウムの圧延または押出し製品では、結晶粒微細
化剤として添加されたＡｌ−Ｔｉ−Ｂ母合金によって生
成されたＴｉＢ2は溶湯中で固体で存在するため凝集し
やすく、線状傷等の欠陥を生じることが問題となってお
り、これら圧延または押出し製品の製造に使用される鋳
造品のＡｌまたはＡｌ合金溶湯中にはＢを含まないＡｌ
−Ｔｉ母合金を添加し、ＴｉＡｌ3の生成により結晶粒
の微細化を図っている。Upon casting of the Related Art Aluminum, in order to grain refinement of the casting, as grain refiner in the melt, by adding Al-TiB master alloys, TiB 2 or T
Techniques for refining crystal grains by forming iAl 3 are well known. The rolled or extruded product of aluminum required surface properties in recent becomes stricter, TiB 2 produced by Al-TiB master alloys which are added as grain refiner is present in the solid in the molten metal Therefore, there is a problem in that the Al or Al alloy melt of the casting used for the production of these rolled or extruded products does not contain B.
It was added -Ti mother alloy, thereby achieving miniaturization of the crystal grains by the formation of TiAl 3.
【０００３】しかしながら、従来品のＡｌ−Ｔｉ母合金
を添加したアルミニム溶湯は、Ａｌ−Ｔｉ−Ｂ母合金を
添加した場合に比べて溶湯中に含まれるＡｌ酸化物が多
く発生し、Ａｌ酸化物を除去するフィルターが早期に目
詰まりを生じるため、フィルター寿命が短く、作業性お
よび経済性に問題があった。これはＡｌ−Ｔｉ母合金製
造時に生成したＴｉＯ2を含むＡｌ−Ｔｉ母合金の添加
によって母合金中のＴｉＯ2がアルミニウム溶湯中で還
元されて酸素を放出し、この酸素がＡｌと反応してＡｌ
2Ｏ3が生成される。このＡｌ2Ｏ3は比重がＡｌ溶湯と同
等であるため沈降または遊離しにくく、Ａｌ溶湯中に存
在するため、フィルターの目詰まりの原因となる。[0003] However, in a conventional aluminum melt to which an Al-Ti master alloy is added, more Al oxide is contained in the melt than in the case where an Al-Ti-B master alloy is added, and Al oxide is generated. Since the filter for removing the particles is clogged at an early stage, the filter life is short, and there are problems in workability and economy. This is because the addition of an Al-Ti master alloy containing TiO 2 generated during the production of the Al-Ti master alloy reduces TiO 2 in the mother alloy in the molten aluminum to release oxygen, which reacts with Al. Al
2 O 3 is produced. Since Al 2 O 3 has a specific gravity equal to that of the molten Al, it is unlikely to settle or separate, and because it is present in the molten Al, it causes clogging of the filter.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記したよう
な従来技術における問題点を解決するものであって、表
面特性の厳しいＡｌまたはＡｌ合金鋳造品の結晶粒を微
細化することができるフィルターの目詰まりの少ないＡ
ｌまたはＡｌ合金の結晶粒微細化方法を提供し、併せて
そのために添加使用されるＡｌ−Ｔｉ母合金を提供する
ことを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and is a filter capable of refining crystal grains of an Al or Al alloy casting having severe surface characteristics. A with less clogging
It is an object of the present invention to provide a method for refining the crystal grain of l or Al alloy, and to provide an Al-Ti master alloy additionally used for the method.
【０００５】[0005]
【課題を解決するための手段】本発明は、ＡｌまたはＡ
ｌ合金溶湯に、粒状のＴｉを原料とし、９００℃以下で
製造されたＡｌ−Ｔｉ母合金を結晶粒微細化剤として添
加することを特徴とするものであり、これにより前記課
題を解決したものである。すなわち本発明において結晶
粒微細化のために添加されるＡｌ−Ｔｉ母合金は、原料
として粒状のＴｉを使用し、Ｔｉの添加量が２ｗｔ％以
下、溶解温度が９００℃以下として製造してなるもので
ある。SUMMARY OF THE INVENTION The present invention relates to an Al or A
(1) To a molten alloy, using a granular Ti as a raw material, and adding an Al-Ti master alloy produced at 900 ° C. or less as a crystal grain refiner, thereby solving the above problem. It is. That is, in the present invention, the Al-Ti mother alloy added for refining the crystal grains is produced by using granular Ti as a raw material, adding the Ti in an amount of 2 wt% or less, and having a melting temperature of 900 ° C. or less. Things.
【０００６】通常用いられるＡｌ−Ｔｉ母合金は、Ｔｉ
濃度が５ｗｔ％〜１０ｗｔ％のもので、製造時の溶解温
度はＴｉ濃度に対応して、１１００℃〜１３００℃と高
温になり、高温度に起因してＴｉの酸化物量が増加す
る。さらに、添加するＴｉは主に棒状またはボタン状の
もので、溶解されにくく、Ｔｉも酸化されてＴｉの酸化
物が生成されやすく、それ故にＡｌ−Ｔｉ母合金中のＴ
ｉＯ2量が増加する。今、本発明にかかるＡｌ−２ｗｔ
％Ｔｉ母合金と、従来品のＡｌ−５ｗｔ％Ｔｉ母合金イ
ンゴットのＥＤＸ分析結果を示せば、図２および図３の
ようになる。すなわち、これら図２および図３より、本
発明のＡｌ−２ｗｔ％Ｔｉ母合金中には酸素がほとんど
存在せず、従ってＴｉＯ2もほとんど存在しないのに対
し、従来品のＡｌ−５ｗｔ％Ｔｉ母合金では酸素および
チッソとも明らかな存在を示し、ＴｉＯ2が生成されて
いることが分かる。A commonly used Al-Ti master alloy is Ti
When the concentration is 5 wt% to 10 wt%, the melting temperature during the production becomes as high as 1100 ° C. to 1300 ° C. in accordance with the Ti concentration, and the high temperature increases the amount of Ti oxide. Further, the Ti to be added is mainly in the form of a rod or a button and is difficult to dissolve, and Ti is also easily oxidized to easily form an oxide of Ti.
The amount of iO 2 increases. Now, the Al-2wt according to the present invention
2 and FIG. 3 show the EDX analysis results of the% Ti mother alloy and the conventional Al-5 wt% Ti mother alloy ingot. That is, from FIGS. 2 and 3, it can be seen from FIG. 2 and FIG. 3 that the Al-2 wt% Ti mother alloy of the present invention hardly contains oxygen, and thus hardly contains TiO 2 , whereas the conventional Al-5 wt% Ti mother alloy. In the alloy, both oxygen and nitrogen were clearly present, indicating that TiO 2 was generated.
【０００７】[0007]
【発明の実施の形態】本発明において、アルミニウム溶
湯に添加するＡｌ−Ｔｉ母合金は、そのＴｉ原料は溶解
しやすい粒状のものとし、かつ母合金中のＴｉ濃度をＴ
ｉＯ2の生成量の少ない２ｗｔ％以下とし、９００℃以
下で製造したものである。本発明母合金において、Ｔｉ
含有量が２ｗｔ％を越えると溶解温度が高くなり、母合
金中の酸化物の生成が急増し、その結果Ａｌ−Ｔｉ母合
金を添加したＡｌ溶湯中の酸化物の量が増え、フィルタ
ーの早期目詰まりを生じるようになる。また、Ｔｉ原料
として粒状のものを用いることにより溶解が容易にな
り、９００℃以下での製造が可能となり、製造時の母合
金中の酸化物生成も少なくすることができる。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, an Al—Ti master alloy to be added to a molten aluminum has a Ti raw material in a granular form that can be easily dissolved and a Ti concentration in the master alloy of T
It is manufactured at a temperature of 900 ° C. or less, with 2% by weight or less of iO 2 being produced. In the master alloy of the present invention, Ti
If the content exceeds 2% by weight, the melting temperature rises, the generation of oxides in the master alloy increases rapidly, and as a result, the amount of oxides in the Al melt to which the Al-Ti master alloy is added increases, and Clogging will occur. In addition, the use of granular Ti raw materials facilitates melting, enables production at 900 ° C. or lower, and reduces oxide formation in the mother alloy during production.
【０００８】[0008]
【実施例】７６０℃のＡｌ溶湯中に結晶粒微細化剤とし
て、本発明の製造条件で作製したＡｌ−２ｗｔ％Ｔｉ母
合金をＡｌ溶湯中のＴｉ濃度が２０００ｐｐｍ（通常濃
度；５０ｐｐｍ）となるように添加し、その溶湯７００
ｇを図１に示す濾過試験装置で濾過した。この濾過試験
をフィルターを取り替えて１０回繰返し行った。その結
果、本発明の製造条件で作製したＡｌ−２ｗｔ％Ｔｉは
全量濾過でき、フィルター上面の溶湯の残留は発生しな
かった。すなわち、ヘッド高さが生じず、フィルターの
早期目詰まりは生じないことが認められた。EXAMPLE As a grain refiner in an Al melt at 760 ° C., an Al-2 wt% Ti master alloy produced under the manufacturing conditions of the present invention has a Ti concentration in the Al melt of 2000 ppm (normal concentration: 50 ppm). So that the molten metal 700
g was filtered with the filtration test apparatus shown in FIG. This filtration test was repeated 10 times with the filter replaced. As a result, all of the Al-2 wt% Ti produced under the production conditions of the present invention could be filtered, and no molten metal remained on the upper surface of the filter. That is, it was recognized that the head height did not occur and the filter did not clog at an early stage.
【０００９】[0009]
【比較例】７６０℃のＡｌ溶湯中に結晶粒微細化剤とし
て、現有のＡｌ−５ｗｔ％Ｔｉ母合金、Ａｌ−１０ｗｔ
％Ｔｉ母合金をＡｌ溶湯中のＴｉ濃度が２０００ｐｐｍ
となるようにそれぞれ添加し、それらの溶湯７００ｇを
実施例で使用したと同じ濾過試験装置で各々濾過した。
その結果、現有のＡｌ−５ｗｔ％Ｔｉ母合金添加の溶湯
はフィルターを取り替えて５回繰返し濾過したところ、
濾過抵抗が上昇し、フィルター上面にヘッド高さで２５
〜３５ｍｍの溶湯が残留した。また、現有のＡｌ−１０
ｗｔ％Ｔｉ母合金添加の溶湯はフィルターを取り替えて
３回繰返し濾過したところ、濾過抵抗が上昇し、フィル
ター上面にヘッド高さで８０〜９０ｍｍと多量の溶湯が
残留し、フィルターの早期目詰まりを生じていることが
認められた。これらの結果を表１に示す。COMPARATIVE EXAMPLE Existing Al-5 wt% Ti mother alloy, Al-10 wt% as a grain refiner in molten Al at 760 ° C.
% Ti mother alloy with 2000ppm Ti concentration in molten Al
, And 700 g of the molten metal was filtered using the same filtration test apparatus as used in the examples.
As a result, when the existing molten metal with the addition of Al-5 wt% Ti master alloy was filtered five times repeatedly by replacing the filter,
The filtration resistance rises and the head height is 25
~ 35 mm of molten metal remained. In addition, existing Al-10
When the filter with the wt% Ti mother alloy added was filtered three times with the filter replaced, the filtration resistance increased, and a large amount of molten metal with a head height of 80 to 90 mm remained on the upper surface of the filter. Was found to have occurred. Table 1 shows the results.
【００１０】[0010]
【表１】 [Table 1]
【００１１】[0011]
【発明の効果】以上のような本発明によれば、結晶粒微
細化剤として、表面特性に厳しい圧延または押出し製品
用鋳造品に表面欠陥の原因となる凝集したＴｉＢ2を含
まず、さらに通常のＡｉ−Ｔｉ母合金に見られる濾過用
フィルターの早期目詰まりを軽減でき、鋳造工程での作
業性および経済性に富んだ結晶粒微細化効果を得ること
ができる。According to the present invention as described above, as a grain refining agent, a cast product for a rolled or extruded product having strict surface properties does not contain agglomerated TiB 2 which causes surface defects, and more usually Can reduce the early clogging of the filter for filtration found in the Ai-Ti master alloy of the present invention, and can obtain a crystal grain refining effect that is excellent in workability and economy in the casting process.
【図１】本発明実施例および比較例で使用した濾過試験
装置の概略説明図である。FIG. 1 is a schematic explanatory view of a filtration test apparatus used in Examples of the present invention and Comparative Examples.
【図２】本発明にかかるＡｉ−２ｗｔ％Ｔｉ母合金のＥ
ＤＸ分析結果図である。FIG. 2 shows E of an Ai-2 wt% Ti master alloy according to the present invention.
It is a DX analysis result figure.
【図３】従来品のＡｉ−５ｗｔ％Ｔｉ母合金のＥＤＸ分
析結果図である。FIG. 3 is a view showing an EDX analysis result of a conventional Ai-5 wt% Ti mother alloy.
Claims (2)
を原料とし、９００℃以下で製造されたＡｌ−Ｔｉ母合
金を結晶粒微細化剤として添加することを特徴とするＡ
ｌまたはＡｌ合金の結晶粒微細化方法。1. The method according to claim 1, wherein the Al or Al alloy melt is mixed with granular Ti.
Characterized by adding an Al—Ti master alloy produced at 900 ° C. or lower as a crystal grain refiner using
A method for refining crystal grains of 1 or Al alloy.
めに添加されるＡｌ−Ｔｉ母合金であって、原料が粒状
のＴｉを使用し、Ｔｉの添加量が２ｗｔ％以下、溶解温
度が９００℃以下として製造してなるＡｌ−Ｔｉ母合
金。2. An Al—Ti master alloy added for refining the crystal grains of Al or an Al alloy, wherein the raw material is granular Ti, the amount of Ti added is 2 wt% or less, and the melting temperature is Al-Ti mother alloy manufactured at 900 ° C or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21541296A JPH1046267A (en) | 1996-07-26 | 1996-07-26 | Method for grain refinement of Al or Al alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21541296A JPH1046267A (en) | 1996-07-26 | 1996-07-26 | Method for grain refinement of Al or Al alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1046267A true JPH1046267A (en) | 1998-02-17 |
Family
ID=16671907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21541296A Pending JPH1046267A (en) | 1996-07-26 | 1996-07-26 | Method for grain refinement of Al or Al alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1046267A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002249840A (en) * | 2001-02-21 | 2002-09-06 | Toyota Central Res & Dev Lab Inc | Aluminum casting alloy for piston and method of manufacturing piston |
| CN100383268C (en) * | 2005-10-21 | 2008-04-23 | 兰州理工大学 | Preparation method of Al-Ti-C composite grain refiner for aluminum and aluminum alloy |
| CN118080822A (en) * | 2024-01-18 | 2024-05-28 | 佛山市三水凤铝铝业有限公司 | A method for solving the problem of coarse grain on the surface of 6 series aluminum alloy module profiles |
-
1996
- 1996-07-26 JP JP21541296A patent/JPH1046267A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002249840A (en) * | 2001-02-21 | 2002-09-06 | Toyota Central Res & Dev Lab Inc | Aluminum casting alloy for piston and method of manufacturing piston |
| CN100383268C (en) * | 2005-10-21 | 2008-04-23 | 兰州理工大学 | Preparation method of Al-Ti-C composite grain refiner for aluminum and aluminum alloy |
| CN118080822A (en) * | 2024-01-18 | 2024-05-28 | 佛山市三水凤铝铝业有限公司 | A method for solving the problem of coarse grain on the surface of 6 series aluminum alloy module profiles |
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