JP3284232B2 - Purification method of flame-retardant magnesium alloy - Google Patents
Purification method of flame-retardant magnesium alloyInfo
- Publication number
- JP3284232B2 JP3284232B2 JP10109197A JP10109197A JP3284232B2 JP 3284232 B2 JP3284232 B2 JP 3284232B2 JP 10109197 A JP10109197 A JP 10109197A JP 10109197 A JP10109197 A JP 10109197A JP 3284232 B2 JP3284232 B2 JP 3284232B2
- Authority
- JP
- Japan
- Prior art keywords
- magnesium alloy
- flame
- retardant magnesium
- retardant
- molten metal
- 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.)
- Ceased
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- Manufacture And Refinement Of Metals (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、カルシウムを含有
する難燃性マグネシウム合金からきょう雑物を除去して
精製する方法に関する。[0001] The present invention relates to a method for purifying a flame-retardant magnesium alloy containing calcium by removing impurities.
【０００２】[0002]
【従来の技術】マグネシウムやその合金は種々の用途に
用いられており、特にマグネシウム合金は、実用金属材
料中最も軽量である上、切削性が良好で、かつ強度／密
度比が高いことから、航空機材料や自動車材料などとし
て用いられている。そして、このマグネシウム合金とし
ては、例えばＭｇ−Ａｌ系、Ｍｇ−Ｍｎ系、Ｍｇ−Ｚｎ
系、Ｍｇ−Ａｌ−Ｚｎ系、Ｍｇ−Ｚｎ−Ｚｒ系などが知
られている。2. Description of the Related Art Magnesium and its alloys are used for various purposes. In particular, magnesium alloys are the lightest among practical metal materials, have good machinability, and have a high strength / density ratio. It is used as a material for aircraft and automobiles. And, as this magnesium alloy, for example, Mg-Al system, Mg-Mn system, Mg-Zn
Systems, Mg-Al-Zn systems, and Mg-Zn-Zr systems are known.
【０００３】本発明者らは、先にマグネシウム又は前記
マグネシウム合金にカルシウムを添加することにより、
難燃性マグネシウム合金を製造しうることを見出した
が、このカルシウムを添加すると、酸化物などのきょう
雑物が混入し、マグネシウム合金を鋳造した場合、その
機械的強度を低下させるという問題が生じる。そのた
め、溶融状態の難燃性マグネシウム合金に不活性ガスを
吹き込み、気泡に随伴させて酸化物のようなきょう雑物
を浮上させたり、金網などを用いてろ過したり、あるい
は塩素系又はフッ素系フラックスを用いて、きょう雑物
をその中に取り込むことにより、混入するきょう雑物を
除去することが行われている。[0003] The inventors of the present invention previously added calcium to magnesium or the magnesium alloy by
It has been found that a flame-retardant magnesium alloy can be manufactured, but when this calcium is added, impurities such as oxides are mixed in, and when a magnesium alloy is cast, there is a problem that its mechanical strength is reduced. . For this reason, an inert gas is blown into the molten flame-retardant magnesium alloy to float foreign substances such as oxides along with air bubbles, or to filter using a wire mesh, or to use chlorine-based or fluorine-based materials. 2. Description of the Related Art It has been practiced to remove contaminants by incorporating foreign substances therein by using a flux.
【０００４】しかしながら、これらの方法では、難燃性
マグネシウム合金中のきょう雑物を完全に取り除くこと
は困難で、鋳造した場合、その引張り強度の向上はほと
んど認められない。また、このきょう雑物の除去を完全
に行うために、長時間処理すると、流動性が低下して金
網の目詰りを生じたり、フラックス中の塩化物やフッ化
物などによる作業環境の悪化を生じる。However, it is difficult to completely remove impurities in the flame-retardant magnesium alloy by these methods, and when cast, almost no improvement in tensile strength is recognized. In addition, if the treatment is carried out for a long time in order to completely remove the foreign matter, the fluidity is reduced and the wire mesh is clogged, or the working environment is deteriorated due to chlorides and fluorides in the flux. .
【０００５】[0005]
【発明が解決しようとする課題】本発明は、このような
事情のもとで、難燃性マグネシウム合金を鋳造した場合
の機械的強度を向上させるために、その中に含まれてい
るきょう雑物を効果的に除去して、難燃性マグネシウム
合金を精製する方法を提供することを目的としてなされ
たものである。SUMMARY OF THE INVENTION Under such circumstances, the present invention has been developed to improve the mechanical strength when a flame-retardant magnesium alloy is cast. An object of the present invention is to provide a method for purifying a flame-retardant magnesium alloy by effectively removing substances.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、難燃性マ
グネシウム合金からきょう雑物を効果的に除去する方法
について鋭意研究を重ねた結果、難燃性マグネシウム合
金を溶融状態で真空脱気することにより、意外にも合金
中に含まれているガスに随伴してきょう雑物が溶湯表面
に浮上し、除去されることにより、前記目的を達成しう
ることを見出し、この知見に基づいて本発明を完成する
に至った。Means for Solving the Problems The inventors of the present invention have conducted intensive studies on a method for effectively removing foreign matter from a flame-retardant magnesium alloy, and as a result, the flame-retardant magnesium alloy was evacuated in a molten state under vacuum. By noticing, surprisingly, foreign matters floated on the surface of the molten metal accompanying gas contained in the alloy, and were found to be able to achieve the above object by being removed. Thus, the present invention has been completed.
【０００７】 すなわち、本発明は、カルシウムを含有
する難燃性マグネシウム合金を溶融状態において、０．
１〜５０Ｔｏｒｒで少なくとも３０秒間真空脱気してき
ょう雑物を溶湯表面に浮上させることを特徴とするマグ
ネシウム合金の精製方法を提供するものである。That is, the present invention relates to a method of preparing a calcium-containing flame-retardant magnesium alloy in a molten state.
At least 30 seconds vacuum degassing pointed out in 1~50Torr
An object of the present invention is to provide a method for purifying a magnesium alloy, wherein a contaminant is floated on the surface of a molten metal .
【０００８】[0008]
【発明の実施の形態】本発明方法において用いられるカ
ルシウムを含有する難燃性マグネシウム合金の例として
は、マグネシウム又はＭｇ−Ａｌ系、Ｍｇ−Ｍｎ系、Ｍ
ｇ−Ｚｎ系、Ｍｇ−Ｌｉ系、Ｍｇ−Ａｌ−Ｚｎ系、Ｍｇ
−Ｚｎ−Ｚｒ系、Ｍｇ−Ｃｅ−Ｚｒ系などの公知の合金
に対して、カルシウムを０．１〜１０重量％程度の割合
で添加したものが挙げられる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of a calcium-containing flame-retardant magnesium alloy used in the method of the present invention include magnesium or Mg-Al, Mg-Mn and M-Mn.
g-Zn system, Mg-Li system, Mg-Al-Zn system, Mg
A known alloy such as -Zn-Zr-based or Mg-Ce-Zr-based alloys may be obtained by adding calcium at a ratio of about 0.1 to 10% by weight.
【０００９】本発明においては、このマグネシウム合金
を、溶融状態において真空脱気するが、その際のマグネ
シウム合金の溶湯温度は、合金の種類に応じて適宜選定
されるが、通常７００〜８００℃の範囲である。また、
真空度については、合金中のガスに随伴させてきょう雑
物を溶湯表面に効果的に浮上させるには５０Ｔｏｒｒ以
下の圧力が用いられる。しかし、あまり真空度を高くし
ても、その割には効果の向上はみられず、むしろ装置面
で経済的に不利となるので、圧力の下限は０．１Ｔｏｒ
ｒとする。真空脱気時間は３０秒間以上が必要であり、
３０秒間未満ではきょう雑物は十分に除去されない。ま
た、真空脱気時間があまり長すぎても無意味であり、し
たがって、好ましい真空脱気時間は３０秒〜２０分間の
範囲で選ぶのが有利である。In the present invention, this magnesium alloy is vacuum-degassed in a molten state. The temperature of the molten magnesium alloy is appropriately selected according to the kind of the alloy. Range. Also,
With respect to the degree of vacuum, a pressure of 50 Torr or less is used to effectively float the foreign substances accompanying the gas in the alloy on the surface of the molten metal. However, even if the degree of vacuum is increased too much, the effect is not improved, and the apparatus is economically disadvantageous. Therefore, the lower limit of the pressure is 0.1 Torr.
r. Vacuum deaeration time needs 30 seconds or more,
If the time is less than 30 seconds, foreign matter is not sufficiently removed. In addition, it is meaningless if the vacuum degassing time is too long. Therefore, it is advantageous to select a preferable vacuum degassing time in the range of 30 seconds to 20 minutes.
【００１０】この真空脱気処理により、マグネシウム合
金中のきょう雑物は、合金中に含まれているガスに随伴
して溶湯表面に浮上し、取り除かれるので、この溶湯を
金型に流し込み鋳造したものは、機械的強度が向上す
る。また、耐食性の向上も期待できる。[0010] By this vacuum degassing treatment, impurities in the magnesium alloy float on the surface of the molten metal accompanying the gas contained in the alloy and are removed, so that the molten metal is poured into a mold and cast. Those with improved mechanical strength. In addition, improvement in corrosion resistance can be expected.
【００１１】[0011]
【発明の効果】本発明によれば、カルシウムを含む難燃
性マグネシウム合金からきょう雑物を容易に取り除くこ
とができ、その結果、該マグネシウム合金を鋳造した場
合、機械的強度が向上する。According to the present invention, impurities can be easily removed from the flame-retardant magnesium alloy containing calcium, and as a result, when the magnesium alloy is cast, the mechanical strength is improved.
【００１２】[0012]
【実施例】次に、本発明を実施例によりさらに詳細に説
明する。Next, the present invention will be described in more detail with reference to examples.
【００１３】比較例 ステンレス鋼製るつぼに、ダイカスト用マグネシウム合
金ＡＺ９１（Ａｌ ９重量％、Ｚｎ０．７重量％含有）
を入れたのち、蓋をし、これを７００℃の電気炉中で加
熱し、マグネシウム合金を溶解させた。次いで、溶湯表
面の酸化物を取り除いたのち、カルシウムをマグネシウ
ム合金に対して、１、２及び５重量％の割合でそれぞれ
添加し、棒でかきまぜながら混合し、難燃性マグネシウ
ム合金とした。その後、５分間保持したのち、溶湯表面
の不純物を取り除いてから、舟型の金型に７００℃の溶
湯を流し込み鋳造した。Comparative Example Magnesium alloy AZ91 for die casting (containing 9% by weight of Al and 0.7% by weight of Zn) in a stainless steel crucible.
Was put, and the lid was put on. This was heated in an electric furnace at 700 ° C. to dissolve the magnesium alloy. Next, after removing the oxide on the surface of the molten metal, calcium was added to the magnesium alloy at a ratio of 1, 2 and 5% by weight, respectively, and mixed with stirring with a rod to obtain a flame-retardant magnesium alloy. Then, after holding for 5 minutes, impurities on the surface of the molten metal were removed, and then the molten metal at 700 ° C. was poured into a boat-shaped mold and cast.
【００１４】次に、この鋳造材料を４４０℃で２４時間
溶体化処理したのち、旋盤で引張り試験用の試験片に加
工し、引張り試験を行った。その結果を表１に示す。各
試験片の破断面を観察すると、いずれもきょう雑物の混
入がみられた。Next, the cast material was subjected to a solution treatment at 440 ° C. for 24 hours, then processed into a test piece for a tensile test by a lathe, and a tensile test was performed. Table 1 shows the results. Observation of the fracture surface of each test piece revealed that foreign matter was mixed in each case.
【００１５】実施例 比較例と同様にして、マグネシウム合金を溶解し、これ
にカルシウムを１、２及び５重量％の割合でそれぞれ添
加して難燃性マグネシウム合金としたのち、５分間保持
した。次いで、溶湯の入ったステンレス鋼製るつぼを鉄
製の真空容器に入れ、ロータリーポンプで１Ｔｏｒｒま
で減圧し、この圧力下で２分間保持して真空脱気を行っ
た。その後、再度るつぼを電気炉に入れ、溶湯温度を高
め、舟型の金型に７００℃の溶湯を流し込み鋳造した。
以下、比較例と同様にして溶体化処理を行ったのち、試
験片を作製し、引張り試験を行った。結果を表１に示
す。各試験片の破断面を観察すると、いずれもきょう雑
物の混入はみられなかった。Example A magnesium alloy was melted in the same manner as in the comparative example, and calcium was added to the magnesium alloy at a ratio of 1, 2 and 5% by weight, respectively, to obtain a flame-retardant magnesium alloy. Next, the stainless steel crucible containing the molten metal was put in an iron vacuum vessel, and the pressure was reduced to 1 Torr by a rotary pump, and the pressure was maintained for 2 minutes to perform vacuum degassing. After that, the crucible was put into the electric furnace again, the temperature of the molten metal was raised, and the molten metal at 700 ° C. was poured into a boat-shaped mold and cast.
Hereinafter, after performing a solution treatment in the same manner as in the comparative example, a test piece was prepared, and a tensile test was performed. Table 1 shows the results. Observation of the fracture surface of each test piece showed that no foreign matter was mixed.
【００１６】[0016]
【表１】 [Table 1]
【００１７】表１から分かるように、実施例のものは、
いずれも対応する比較例のものに比べて、引張り強度が
向上している。以上の結果、難燃性マグネシウム合金を
溶融状態において真空脱気することにより、きょう雑物
が容易に除去され、引張り強度が向上した健全な鋳物と
なることが分かる。As can be seen from Table 1, those of the embodiment are as follows.
In each case, the tensile strength is higher than that of the corresponding comparative example. From the above results, it can be seen that by vacuum degassing the flame-retardant magnesium alloy in a molten state, impurities are easily removed and a sound casting with improved tensile strength is obtained.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭48−20710（ＪＰ，Ａ) 特公 昭56−41346（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 1/02 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-48-20710 (JP, A) JP-B-56-41346 (JP, B2) (58) Fields investigated (Int. Cl. 7 , DB name) C22C 1/02
Claims (1)
ム合金を溶融状態において、０．１〜５０Ｔｏｒｒで少
なくとも３０秒間真空脱気してきょう雑物を溶湯表面に
浮上させることを特徴とする難燃性マグネシウム合金の
精製方法。In a molten state, a calcium-containing flame-retardant magnesium alloy is vacuum-degassed at 0.1 to 50 Torr for at least 30 seconds to deposit impurities on the surface of the molten metal.
A method for purifying a flame-retardant magnesium alloy, which is characterized by floating .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10109197A JP3284232B2 (en) | 1997-04-02 | 1997-04-02 | Purification method of flame-retardant magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10109197A JP3284232B2 (en) | 1997-04-02 | 1997-04-02 | Purification method of flame-retardant magnesium alloy |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30515899A Division JP3318606B2 (en) | 1999-10-27 | 1999-10-27 | Method for producing calcium-containing magnesium alloy casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10280062A JPH10280062A (en) | 1998-10-20 |
| JP3284232B2 true JP3284232B2 (en) | 2002-05-20 |
Family
ID=14291433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10109197A Ceased JP3284232B2 (en) | 1997-04-02 | 1997-04-02 | Purification method of flame-retardant magnesium alloy |
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| JP (1) | JP3284232B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005350808A (en) * | 2004-06-11 | 2005-12-22 | Hyogo Prefecture | Helmet and helmet manufacturing method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100526039B1 (en) * | 2002-09-10 | 2005-11-09 | 인하대학교 산학협력단 | Method for purifying magnesium scrap with vacuum distillation |
| CN1314820C (en) * | 2005-08-18 | 2007-05-09 | 沈阳工业大学 | Magnesium alloy melt forced-circulation smelting method |
| KR101964895B1 (en) | 2011-04-18 | 2019-04-02 | 고쿠리츠다이가쿠호진 도호쿠다이가쿠 | Magnesium fuel cell |
| CN112779430B (en) * | 2020-12-24 | 2022-03-29 | 中国兵器工业第五九研究所 | Preparation method of high-quality magnesium alloy melt |
| CN115725870A (en) * | 2022-11-28 | 2023-03-03 | 电子科技大学长三角研究院(湖州) | A kind of preparation method and application of micro-nano alloy material based on alkali metal flux |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5641346B2 (en) | 2011-03-15 | 2014-12-17 | 住友電装株式会社 | Shield shell mounting structure |
-
1997
- 1997-04-02 JP JP10109197A patent/JP3284232B2/en not_active Ceased
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5641346B2 (en) | 2011-03-15 | 2014-12-17 | 住友電装株式会社 | Shield shell mounting structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005350808A (en) * | 2004-06-11 | 2005-12-22 | Hyogo Prefecture | Helmet and helmet manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10280062A (en) | 1998-10-20 |
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