JP3888537B2 - Magnesium alloy brazing flux and brazing material and method for brazing magnesium alloy - Google Patents
Magnesium alloy brazing flux and brazing material and method for brazing magnesium alloy Download PDFInfo
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- JP3888537B2 JP3888537B2 JP2002214753A JP2002214753A JP3888537B2 JP 3888537 B2 JP3888537 B2 JP 3888537B2 JP 2002214753 A JP2002214753 A JP 2002214753A JP 2002214753 A JP2002214753 A JP 2002214753A JP 3888537 B2 JP3888537 B2 JP 3888537B2
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- brazing
- magnesium alloy
- flux
- magnesium
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Description
【0001】
【発明が属する技術分野】
本発明は,各種のマグネシウム合金を大気中でろう付けするためのフラックスとろう材に関するものである。
【0002】
【従来の技術】
マグネシウムおよびマグネシウム合金の表面は非常に酸化しやすく,安定な酸化マグネシウム皮膜(MgO)で覆われている。そのため,そのろう付けは簡単ではなく,ろう付けはほとんど行われていない。従来,文献(Welding Handbook Vol.3,8th Edition,American Welding Society,および、ろう接便覧、産報、1967)に記載されているマグネシウム合金ろう付け用のフラックスとろう材はそれぞれ表1と表2に示す通りである。
【0003】
ろう付けが必要とされる展伸材としてのマグネシウム合金AZ31B(3wt%Al-1wt%Znで残りはMg)板を用いて,表1と表2に示されるフラックスとろう材を種々組み合わせてろう付けを行ったが,ろう材は濡れず,さらにマグネシウム合金板が部分溶融を起こし,現状では,マグネシウム合金のろう付けは難しい状態にある。
【0004】
すなわち,従来考えられているフラックスは酸化マグネシウム皮膜を還元除去する能力が不十分であること,および,ろう材の融点が約570℃〜600℃と高く,マグネシウム合金(たとえば,AZ31B合金の固相線:575℃,液相線:630℃)の融点に近いために,マグネシウム合金がろう付けによって部分的に溶融を起したり,損傷劣化するという問題がある。
【0005】
【表1】
【0006】
【表2】
【0007】
【発明が解決しようとする課題】
本発明の目的は,大気中においてマグネシウム合金を450℃〜500℃の比較的低温度でろう付することができる,フラックスとろう材を提供することにある。
【0008】
【課題を解決するための手段】
上記の課題は,酸化マグネシウム皮膜の還元除去が可能である塩化カルシウム(CaCl2)を多量に含有し,溶融温度が約440℃〜約500℃の低温度になるように成分配合したフラックス,および,融点が500℃以下のろう材を開発することによって解決される。
【0009】
すなわち,40重量%から75重量%の塩化カルシウム(CaCl2)を主成分とし,10重量%から30重量%の塩化ナトリウム(NaCl), および5重量%から30重量%の塩化リチウム(LiCl)を含有するフラックス,および,50重量%から70重量%のインジュウム(In)と20重量%から50重量%のマグネシウム(Mg)および0重量%から10重量%の亜鉛(Zn)を主成分とするろう材を提供することによって解決される。
【0010】
【発明の実施の形態】
発明した粉末状フラックスをそのまま, あるいはアルコールで溶いて,接合面に塗布する。ろう材は適当な大きさの形状に切り出して接合面に挿入し,大気中で加熱することによって接合がなされる。
【0011】
【実施例】
発明したフラックスの組成は,塩化カルシウム(CaCl2)と塩化ナトリウム(NaCl)および塩化リチウム(LiCl)の三元系の組成となるように調整する。この際、好ましくは三元系の共晶組成にするのがよい。すなわち,請求項に示された組成の範囲すなわち40重量%から75重量%の塩化カルシウム(CaCl2)を主成分として、10重量%から30重量%の塩化ナトリウム(NaCl), 及び5重量%から30重量%の塩化リチウム(LiCl)を添加することにより, フラックスの溶融温度をろう付けに好適な約440℃〜約500℃に調整する。一例として実測値を示すと,61.3重量%の塩化カルシウム(CaCl2),16.4重量%の塩化ナトリウム(NaCl)および22.3重量%の塩化リチウム(LiCl)を混合したフラックスは,その溶融温度は約440℃となる。
【0012】
また,ろう付け時のフラックスの作用効果においては,上記組成範囲に調整したフラックスでは,ほとんど差異はなかった。次に発明したろう材の組成の一例と溶融温度(液相線)を表3に示す。この表3にはろう材に適当なろう付け温度と継ぎ手強さも示してある。このろう材の組成のうち,亜鉛(Zn)の添加量を多くすれば,ろう材の溶融温度は低下するが,フラックスの溶融温度の関係から,上限は約10重量%とするのが良い。
【0013】
上記のフラックスとろう材を用いて,板厚1mmのマグネシウム合金AZ31B板(幅10mm×長さ30mm)2枚を十字の形に重ね合わせてろう付けをした。毎秒10℃の加熱速度で所定のろう付け温度まで加熱して,30秒間保持してろう付けした。ろう付けされた十字重ね継ぎ手を十字引張ジグに取り付けて引張はがし試験を行い,引き剥がし荷重を継ぎ手強さとした。その継ぎ手強さを表3に示す。
【0014】
【表3】
【0015】
表3からわかるように,発明したろう材の溶融温度は435℃〜470℃であり,当初の目標どおり500℃以下でろう付けが可能になった。また,継ぎ手の強さも表3に示す値で十分であり,特に表3のろう材1による継ぎ手は母材部で破断して,母材の強さ以上の強い継ぎ手が得られる。亜鉛の添加量を調整することによって溶融温度を調整でき,溶融温度を下げることができるが,反面,継手の強さは低下する。
【0016】
図1には,走査電子顕微鏡によるろう付け部の断面組織写真と元素分布を示す。発明したフラックスと表3に示すろう材2を用いて,AZ31Bマグネシウム合金板を460℃でろう付けした場合の, ろう付け部の断面組織の走査電子顕微鏡像(左上)とマグネシウム(Mg, 左下),亜鉛(Zn, 右上)とインジウム(In, 右下)の元素分布像を示す。ろう付け部の断面組織写真において,中央の灰色部はろう層部であり,上下の黒い箇所はマグネシウム合金母材部である。両母材が良くろう付けされていることが分かる。また,ろう層部における Mg,ZnとInの分布を見ると,偏析もなくほぼ均一に分布しており,良くろう付けされていることが分かる。
【0017】
なお請求項に示すように配合量を50重量%から70重量%の重量範囲のインジュウム(In)と、20重量%から50重量%の重量範囲のマグネシウム(Mg)と0重量%から10重量%の重量範囲の亜鉛(Zn)に調整したろう材でもほぼ同等の効果を得た。
【0018】
【発明の効果】
上記の説明のように,本発明による40重量%から75重量%の塩化カルシウム(CaCl2)を主成分とし,10重量%から30重量%の塩化ナトリウム(NaCl)および5重量%から30重量%の塩化リチウム(LiCl)を含有するフラックス,および,50重量%から70重量%のインジュウム(In)と20重量%から50重量%のマグネシウム(Mg)および0重量%から10重量%の亜鉛(Zn)を主成分とするろう材を用いることによって,展伸マグネシウム合金材を大気中でろう付けすることが可能となり, 接合部の強さも初期の目的に達する十分な強さを有するろう付け継ぎ手が得られる。
【図面の簡単な説明】
【図1】 ろう付け部の走査電子顕微鏡による断面組織写真と元素分布[0001]
[Technical field to which the invention belongs]
The present invention relates to a flux and a brazing material for brazing various magnesium alloys in the atmosphere.
[0002]
[Prior art]
The surface of magnesium and magnesium alloy is very easy to oxidize and is covered with a stable magnesium oxide film (MgO). Therefore, the brazing is not easy and the brazing is hardly performed. Conventionally, fluxes and brazing materials for brazing magnesium alloys described in the literature (Welding Handbook Vol.3, 8th Edition, American Welding Society, and Brazing Handbook, Industrial Report, 1967) are shown in Tables 1 and 2, respectively. As shown in
[0003]
Using a magnesium alloy AZ31B (3wt% Al-1wt% Zn and the rest Mg) as a wrought material that requires brazing, various combinations of fluxes and brazing materials shown in Tables 1 and 2 will be used. Although brazing was performed, the brazing material did not get wet, and the magnesium alloy sheet partially melted. At present, brazing of the magnesium alloy is difficult.
[0004]
In other words, the flux conventionally considered has insufficient ability to reduce and remove the magnesium oxide film, and the melting point of the brazing material is as high as about 570 ° C to 600 ° C, and the magnesium alloy (for example, solid phase of AZ31B alloy). Because the melting point is close to the melting point (line: 575 ° C, liquidus line: 630 ° C), there is a problem that the magnesium alloy partially melts or deteriorates due to brazing.
[0005]
[Table 1]
[0006]
[Table 2]
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide a flux and a brazing material capable of brazing a magnesium alloy at a relatively low temperature of 450 ° C. to 500 ° C. in the atmosphere.
[0008]
[Means for Solving the Problems]
The above problems include a flux containing a large amount of calcium chloride (CaCl 2 ) capable of reducing and removing the magnesium oxide film, and a component blended so that the melting temperature is about 440 ° C. to about 500 ° C., and This can be solved by developing a brazing material with a melting point of 500 ° C or lower.
[0009]
That is, 40% to 75% calcium chloride (CaCl 2 ) as the main component, 10% to 30% sodium chloride (NaCl), and 5% to 30% lithium chloride (LiCl). Consists of flux and 50% to 70% indium (In), 20% to 50% magnesium (Mg) and 0% to 10% zinc (Zn) Solved by providing the material.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The invented powdery flux is applied as it is or dissolved in alcohol to the joint surface. The brazing material is cut into a suitable size, inserted into the joining surface, and joined by heating in the atmosphere.
[0011]
【Example】
The composition of the invented flux is adjusted so as to have a ternary composition of calcium chloride (CaCl 2 ), sodium chloride (NaCl) and lithium chloride (LiCl). At this time, a ternary eutectic composition is preferable. That is, from the range of the composition indicated in the claims, that is, from 40 wt% to 75 wt% calcium chloride (CaCl 2 ) as a main component, 10 wt% to 30 wt% sodium chloride (NaCl), and 5 wt% By adding 30% by weight lithium chloride (LiCl), the melting temperature of the flux is adjusted to about 440 ° C to about 500 ° C suitable for brazing. When showing measured values as an example, 61.3 wt% of calcium chloride (CaCl 2), 16.4 wt% sodium chloride (NaCl) and 22.3 wt% of the flux mixed with lithium chloride (LiCl), the melt temperature was about 440 It becomes ℃.
[0012]
In addition, in the effect of flux during brazing, there was almost no difference between the flux adjusted to the above composition range. Next, Table 3 shows an example of the composition of the brazing material invented and the melting temperature (liquidus). Table 3 also shows the brazing temperature and joint strength suitable for the brazing material. Of these brazing filler compositions, increasing the amount of zinc (Zn) will lower the melting temperature of the brazing filler metal, but the upper limit should be about 10% by weight because of the flux melting temperature.
[0013]
Using the above flux and brazing material, two magnesium alloy AZ31B plates (width 10mm x length 30mm) with a thickness of 1mm were stacked in a cross shape and brazed. It was heated to a predetermined brazing temperature at a heating rate of 10 ° C. per second and held for 30 seconds for brazing. A brazed cruciform joint was attached to a cruciform tension jig and a tensile peel test was conducted to determine the peel load as the joint strength. The joint strength is shown in Table 3.
[0014]
[Table 3]
[0015]
As can be seen from Table 3, the melting temperature of the invented brazing material was 435 ° C to 470 ° C, and brazing was possible at 500 ° C or less as originally planned. Further, the strength shown in Table 3 is sufficient for the strength of the joint. In particular, the joint of the
[0016]
FIG. 1 shows a cross-sectional structure photograph and element distribution of a brazed portion by a scanning electron microscope. Scanning electron micrograph (upper left) and magnesium (Mg, lower left) of the cross-sectional structure of the brazed part when brazing the AZ31B magnesium alloy plate at 460 ° C using the invented flux and the brazing filler metal 2 shown in Table 3 Element distribution images of zinc (Zn, upper right) and indium (In, lower right) are shown. In the cross-sectional structure photograph of the brazing part, the gray part in the center is the brazing layer part, and the upper and lower black parts are the magnesium alloy base material part. It can be seen that both base materials are well brazed. Also, looking at the distribution of Mg, Zn, and In in the brazing layer, it can be seen that the distribution is almost uniform with no segregation and is well brazed.
[0017]
As shown in the claims, the compounding amount is 50% to 70% by weight of indium (In), 20% to 50% by weight of magnesium (Mg) and 0% to 10% by weight. The brazing material adjusted to zinc (Zn) in the weight range of approximately the same effect was obtained.
[0018]
【The invention's effect】
As explained above, the main component is 40% to 75% calcium chloride (CaCl 2 ) according to the present invention, 10% to 30% sodium chloride (NaCl) and 5% to 30% by weight. Containing 50% to 70% by weight of Indium (In), 20% to 50% by weight of Magnesium (Mg) and 0% to 10% by weight of zinc (Zn) ) Can be used to braze wrought magnesium alloy materials in the atmosphere, and the strength of the joint must be high enough to reach the initial purpose. can get.
[Brief description of the drawings]
1 is a cross-sectional structure photograph and element distribution of a brazed portion by a scanning electron microscope.
Claims (3)
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Cited By (1)
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CN103273211A (en) * | 2013-06-01 | 2013-09-04 | 北京工业大学 | Magnesium alloy flux-cored brazing wire and preparation method thereof |
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TW200920877A (en) * | 2007-11-05 | 2009-05-16 | Magtech Technology Co Ltd | Method for soldering magnesium alloy workpieces |
CN103286484B (en) * | 2013-07-05 | 2015-09-16 | 江阴市赛英电子有限公司 | A kind of MIG welding method of magnesium alloy |
CN103286402B (en) * | 2013-07-05 | 2015-09-30 | 国家电网公司 | A kind of gas brazing welding method of magnesium alloy |
CN105643145B (en) * | 2016-03-25 | 2018-02-23 | 江苏科技大学 | A kind of brazing flux for magnesium alloy brazing |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103273211A (en) * | 2013-06-01 | 2013-09-04 | 北京工业大学 | Magnesium alloy flux-cored brazing wire and preparation method thereof |
CN103273211B (en) * | 2013-06-01 | 2015-06-10 | 北京工业大学 | Magnesium alloy flux-cored brazing wire and preparation method thereof |
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