JP2004050278A - Flux and filler metal for brazing magnesium alloy and its brazing method - Google Patents
Flux and filler metal for brazing magnesium alloy and its brazing method Download PDFInfo
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- JP2004050278A JP2004050278A JP2002214753A JP2002214753A JP2004050278A JP 2004050278 A JP2004050278 A JP 2004050278A JP 2002214753 A JP2002214753 A JP 2002214753A JP 2002214753 A JP2002214753 A JP 2002214753A JP 2004050278 A JP2004050278 A JP 2004050278A
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- brazing
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Abstract
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 OF THE INVENTION
The present invention relates to a flux and a brazing material for brazing various magnesium alloys in the atmosphere.
[0002]
[Prior art]
The surfaces of magnesium and magnesium alloys are very easily oxidized and are covered with a stable magnesium oxide film (MgO). Therefore, the brazing is not easy and brazing is rarely performed. Conventionally, fluxes and brazing filler metals for brazing magnesium alloys described in the literature (Welding Handbook Vol. 3, 8th Edition, American Welding Society, and Brazing Handbook, Production Report, 1967) are shown in Tables 1 and 2, respectively. As shown in FIG.
[0003]
Using a magnesium alloy AZ31B (3 wt% Al-1 wt% Zn, the remainder being Mg) plate 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 plate partially melted. At present, it is difficult to braze magnesium alloy.
[0004]
That is, the flux considered conventionally 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, the solid phase of AZ31B alloy) (Line: 575 ° C., liquidus: 630 ° C.), there is a problem that the magnesium alloy is partially melted or damaged by 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 that can braze 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-mentioned problems include a flux containing a large amount of calcium chloride (CaCl 2 ) capable of reducing and removing a magnesium oxide film, and a component blended so that the melting temperature is as low as about 440 ° C. to about 500 ° C., and The problem can be solved by developing a brazing material having a melting point of 500 ° C. or less.
[0009]
That is, 40% to 75% by weight of calcium chloride (CaCl 2 ) as a main component, 10% to 30% by weight of sodium chloride (NaCl), and 5% to 30% by weight of lithium chloride (LiCl). The flux contained will be based on 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). It is solved by providing materials.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The invented powdered flux is applied as it is or dissolved in alcohol and applied to the joint surface. The brazing material is cut into an appropriate size, inserted into the joining surface, and heated to be joined in the atmosphere.
[0011]
【Example】
The composition of the invented flux is adjusted to be a ternary composition of calcium chloride (CaCl 2 ), sodium chloride (NaCl) and lithium chloride (LiCl). At this time, a ternary eutectic composition is preferably used. That is, the composition ranges indicated in the claims, ie, 40% to 75% by weight of calcium chloride (CaCl 2 ) as a main component, 10% to 30% by weight of sodium chloride (NaCl), and 5% by weight to The melting temperature of the flux is adjusted to about 440 ° C. to about 500 ° C. suitable for brazing by adding 30% by weight of lithium chloride (LiCl). As an example, measured values show that a flux obtained by mixing 61.3% by weight of calcium chloride (CaCl 2 ), 16.4% by weight of sodium chloride (NaCl) and 22.3% by weight of lithium chloride (LiCl) is: Its melting temperature is about 440 ° C.
[0012]
There was almost no difference in the effect of the flux during brazing with the flux adjusted to the above composition range. Next, an example of the composition of the brazing material invented and the melting temperature (liquidus) are shown in Table 3. Table 3 also shows the appropriate brazing temperature and joint strength for the brazing material. If the amount of zinc (Zn) is increased in the composition of the brazing filler metal, the melting temperature of the brazing filler metal decreases, but the upper limit is preferably about 10% by weight in view of the melting temperature of the flux.
[0013]
Using the above flux and brazing material, two magnesium alloy AZ31B plates (width 10 mm x length 30 mm) having a thickness of 1 mm were overlapped 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. The brazed cross-lap joint was attached to a cross tension jig to perform a tensile peel test, and the peeling load was defined as the joint strength. Table 3 shows the joint strength.
[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 intended. Also, the strength of the joint shown in Table 3 is sufficient. Particularly, the joint made of the brazing material 1 shown in Table 3 breaks at the base material, and a strong joint having a strength equal to or greater than the strength of the base material is obtained. By adjusting the amount of zinc added, the melting temperature can be adjusted and the melting temperature can be lowered, but the strength of the joint decreases.
[0016]
FIG. 1 shows a cross-sectional structure photograph and the element distribution of the brazed part by a scanning electron microscope. Scanning electron microscope image (upper left) and magnesium (Mg, lower left) of the cross-sectional structure of the brazed part when AZ31B magnesium alloy plate is brazed at 460 ° C using the invented flux and brazing
[0017]
As shown in the claims, the amount of indium (In) in the range of 50 to 70% by weight, magnesium (Mg) in the range of 20 to 50% by weight, and 0 to 10% by weight. Almost the same effect was obtained with a brazing material adjusted to zinc (Zn) in the weight range of.
[0018]
【The invention's effect】
As described above, 40% to 75% by weight of calcium chloride (CaCl 2 ) according to the present invention as a main component, 10% to 30% by weight of sodium chloride (NaCl) and 5% to 30% by weight. And 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). ) Makes it possible to braze the wrought magnesium alloy material in the air, and the brazing joint has sufficient strength to reach the initial purpose. can get.
[Brief description of the drawings]
Fig. 1 Cross-sectional structure photograph and element distribution of the brazed part by scanning electron microscope
Claims (3)
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JP2002214753A JP3888537B2 (en) | 2002-07-24 | 2002-07-24 | Magnesium alloy brazing flux and brazing material and method for brazing magnesium alloy |
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Cited By (4)
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EP2055419A1 (en) * | 2007-11-05 | 2009-05-06 | Magtech Technology Co., Ltd | Method of soldering a magnesium alloy workpiece with electroless plating with Nickel-Phosphrous, fluxing and use of a leadfree tin alloy solder |
CN103286484A (en) * | 2013-07-05 | 2013-09-11 | 王满玉 | MIG (metal-inert gas) welding method for magnesium alloys |
CN103286402A (en) * | 2013-07-05 | 2013-09-11 | 王满玉 | Flame brazing welding method for magnesium alloys |
CN105643145A (en) * | 2016-03-25 | 2016-06-08 | 江苏科技大学 | Brazing flux for magnesium alloy brazing |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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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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2002
- 2002-07-24 JP JP2002214753A patent/JP3888537B2/en not_active Expired - Fee Related
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2055419A1 (en) * | 2007-11-05 | 2009-05-06 | Magtech Technology Co., Ltd | Method of soldering a magnesium alloy workpiece with electroless plating with Nickel-Phosphrous, fluxing and use of a leadfree tin alloy solder |
CN103286484A (en) * | 2013-07-05 | 2013-09-11 | 王满玉 | MIG (metal-inert gas) welding method for magnesium alloys |
CN103286402A (en) * | 2013-07-05 | 2013-09-11 | 王满玉 | Flame brazing welding method for magnesium alloys |
CN103286402B (en) * | 2013-07-05 | 2015-09-30 | 国家电网公司 | A kind of gas brazing welding method of magnesium alloy |
CN105643145A (en) * | 2016-03-25 | 2016-06-08 | 江苏科技大学 | Brazing flux for magnesium alloy brazing |
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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