JPH07314129A - Vacuum brazing method - Google Patents
Vacuum brazing methodInfo
- Publication number
- JPH07314129A JPH07314129A JP12986894A JP12986894A JPH07314129A JP H07314129 A JPH07314129 A JP H07314129A JP 12986894 A JP12986894 A JP 12986894A JP 12986894 A JP12986894 A JP 12986894A JP H07314129 A JPH07314129 A JP H07314129A
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- alloy
- less
- oxide film
- vacuum
- 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.)
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、Al合金ろう材を用い
て、Al合金材同士、またはAl合金材と異種材料、も
しくは異種材料同士を真空下でろう付する真空ろう付法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum brazing method for brazing Al alloy materials, Al alloy materials and different materials, or different materials under vacuum using Al alloy brazing materials.
【0002】[0002]
【従来の技術】従来、Al合金ろう材を用いてAl合金
材やAl合金以外の異種材料をろう付する方法の一つと
して、フラックスを使用することなく、10-4Torr
程度に調整された真空雰囲気で加熱して接合する真空ろ
う付法が知られている。 ところで一般に管理された状
態のAl合金ろう材やAl合金材の表面には300Å以
上の安定した酸化皮膜が形成されており、ろう付時に
は、ろうのぬれを阻害するこの皮膜を破壊する必要があ
る。通常のろう付法では、フラックスでこの皮膜を破壊
しているが、フラックスを用いない真空ろう付方法で
は、JIS A4004や同A4104に代表されるA
l−Si−Mg系のろう材を使用し、これらのろう材中
に1〜2%程度含まれているMgで前記酸化皮膜を破壊
している。したがって真空ろう付において、Al合金ろ
う材やろう付用Al合金材には、Mgを含有させること
が不可欠であると考えられている。2. Description of the Related Art Conventionally, as a method of brazing an Al alloy material or a dissimilar material other than an Al alloy using an Al alloy brazing material, without using flux, 10 -4 Torr
A vacuum brazing method is known in which heating is performed in a vacuum atmosphere adjusted to a certain degree and bonding is performed. By the way, a stable oxide film of 300 Å or more is formed on the surface of an Al alloy brazing material or an Al alloy material in a generally controlled state, and it is necessary to destroy this film that inhibits the wetting of the brazing material during brazing. . In the normal brazing method, this film is destroyed by flux, but in the vacuum brazing method that does not use flux, A represented by JIS A4004 or A4104 is used.
1-Si-Mg based brazing filler metal is used, and the oxide film is destroyed by Mg contained in the brazing filler metal in an amount of about 1 to 2%. Therefore, in vacuum brazing, it is considered essential to contain Mg in the Al alloy brazing material and the brazing Al alloy material.
【0003】[0003]
【発明が解決しようとする問題点】しかし、ろう材やろ
う付用Al合金材に含まれているMgは、ろう付中に盛
んに蒸発して炉内を汚染するので炉の定期的な清掃が必
要であるばかりでなく、ろう付製品表面にも付着し外観
を損なうという問題がある。これに対し、本願発明者ら
は先に、材料中のMg含有量を厳しく抑え、かつ、ろう
材やろう付用Al合金材の表面酸化皮膜厚さをろう付加
熱前に薄くすることによって、ろう付性を損なうことな
くMgの汚染を防止する真空ろう付方法を提案した(名
称「Al合金ろう付中空構造体の製造方法」等:平成4
年12月9日出願)。ところが、この方法によってろう
付加熱前に酸化皮膜を抑制していても、ろう付時の加熱
で酸化皮膜が成長し、その結果として多くの場合にろう
付性が低下することが判明した。本発明は、上記事情を
背景としてなされたものであり、前記提案をさらに改善
して、ろう付前に酸化皮膜厚さを抑えるとともに、ろう
付加熱時にも成長しにくい酸化皮膜にすることにより、
良好なろう付性を安定して維持した上でMgの弊害を排
除できる真空ろう付方法を提供することを目的とする。However, since Mg contained in the brazing material or the Al alloy material for brazing evaporates vigorously during the brazing and contaminates the inside of the furnace, periodical cleaning of the furnace is required. However, there is a problem in that it is attached to the surface of the brazed product and impairs the appearance. On the other hand, the inventors of the present invention previously severely suppressed the Mg content in the material, and made the surface oxide film thickness of the brazing material or the Al alloy material for brazing thin before the brazing heat, A vacuum brazing method for preventing the contamination of Mg without impairing the brazing property has been proposed (name: “Method for manufacturing Al alloy brazing hollow structure”, etc .: 1992).
Application on December 9, 2012). However, it has been found that even if the oxide film is suppressed before the heat of brazing by this method, the oxide film grows by the heating during brazing, and as a result, the brazing property deteriorates in many cases. The present invention has been made in the background of the above circumstances, further improving the above proposal, while suppressing the oxide film thickness before brazing, by an oxide film that does not easily grow during brazing heat,
It is an object of the present invention to provide a vacuum brazing method capable of eliminating the harmful effects of Mg while stably maintaining good brazing properties.
【0004】[0004]
【問題を解決するための手段】すなわち本発明の真空ろ
う付方法のうち第1の発明は、Al合金ろう材とろう付
用のAl合金材のMg含有量をそれぞれ0.1重量%以
下に規制し、かつ酸処理によってそれぞれの少なくとも
ろう付部の酸化皮膜厚さをろう付加熱前において200
Å以下とし、これら材料を10-5Torr以下の真空下
で加熱するとともに加熱中の前記酸化皮膜厚さをそれぞ
れ200Å以下に抑えてAl合金材同士をろう付するこ
とを特徴とする。That is, the first invention of the vacuum brazing method of the present invention is to reduce the Mg contents of the Al alloy brazing material and the Al alloy material for brazing to 0.1% by weight or less, respectively. The oxide film thickness of at least each brazing part is regulated by acid treatment to 200 before brazing heat.
It is characterized in that it is set to Å or less, and these materials are heated under a vacuum of 10 -5 Torr or less, and the thickness of the oxide film during heating is suppressed to 200 Å or less, respectively, and the Al alloy materials are brazed to each other.
【0005】第2の発明は、Al合金ろう材とろう付用
のAl合金材のMg含有量をそれぞれ0.1重量%以下
に規制し、かつ酸処理によってそれぞれの少なくともろ
う付部の酸化皮膜厚さをろう付加熱前において200Å
以下とし、これら材料と同じくろう付用の異種材料とを
10-5Torr以下の真空下で加熱するとともに加熱中
の前記酸化皮膜厚さをそれぞれ200Å以下に抑えてA
l合金材と異種材料とをろう付することを特徴とする。A second aspect of the present invention regulates the Mg contents of the Al alloy brazing material and the Al alloy material for brazing to 0.1 wt% or less, respectively, and performs an acid treatment to form an oxide film on at least the brazing portion. Thickness is 200Å before brazing heat
Below, these materials as well as other materials for brazing are heated under a vacuum of 10 -5 Torr or less, and the thickness of the oxide film during heating is controlled to 200 Å or less, respectively.
It is characterized in that an l alloy material and a dissimilar material are brazed.
【0006】第3の発明は、Al合金ろう材のMg含有
量を0.1重量%以下に規制し、かつ酸処理によって少
なくともろう付部の酸化皮膜厚さをろう付加熱前におい
て200Å以下とし、このAl合金ろう材とろう付用の
異種材料とを10-5Torr以下の真空下で加熱すると
ともに加熱中の前記酸化皮膜厚さを200Å以下に抑え
て異種材料同士をろう付することを特徴とする。A third aspect of the present invention regulates the Mg content of the Al alloy brazing material to 0.1% by weight or less, and at least makes the oxide film thickness of the brazing portion 200 Å or less before the brazing heat by acid treatment. The Al alloy brazing material and the dissimilar material for brazing are heated under a vacuum of 10 -5 Torr or less, and the thickness of the oxide film during heating is suppressed to 200 Å or less to braze the dissimilar materials. Characterize.
【0007】第4の発明は、第1から第3の発明におい
て、酸化皮膜厚さをろう付加熱前において100Å以
下、ろう付加熱中において150Å以下に制限したこと
を特徴とする。A fourth invention is characterized in that, in the first to third inventions, the thickness of the oxide film is limited to 100 Å or less before the brazing heat is applied and 150 Å or less during the brazing heat.
【0008】なお本願発明でろう付対象となる、ろう付
用のAl合金材は、Mgが重量%で0.1%以下(望ま
しくは0.05%以下)である以外には、他の成分は限
定されない。ただし、Mg と同様にろう付時に蒸散する
元素はできるだけ含有しないのが望ましく、この点でZ
nも重量%で0.1%以下とするのが望ましく、さらに
0.05%以下とするのが一層望ましい。また両者の合
計量を0.1%以下、さらには0.05%以下にするの
が望ましい。The Al alloy material for brazing to be brazed in the present invention has other components except that Mg is 0.1% or less (desirably 0.05% or less) by weight. Is not limited. However, like Mg, it is desirable to contain as little elements as possible that evaporate during brazing.
It is desirable that n is 0.1% or less by weight%, and more desirably 0.05% or less. Further, it is desirable that the total amount of both is 0.1% or less, and further 0.05% or less.
【0009】また異種材料の構成材としては、Al合金
以外のものであればよく、金属材料および非金属材料が
対象となる。直接ろう付が可能な材料として、鉄・ニッ
ケル・チタン・ステンレス・銅を挙げることができる。
構成材がステンレス鋼やセラミックなどからなり、ろう
付性が良好でない場合には、ろう付性が良好な上記材料
などをメッキ、溶射、イオンプレーティングなどの方法
によって表面に被覆する。なお、メッキの中でも電界ニ
ッケルメッキ、無電界ニッケルメッキはアルミのろう付
性に優れている。また異種材料には、Al合金を構成材
とし、その表面に装飾などの目的でAl合金以外の被覆
層が形成されたものも含まれる。要は、少なくともろう
付部がAl合金以外の材料で構成されていればよい。As the constituent material of the different materials, any material other than the Al alloy may be used, and metallic materials and non-metallic materials are targeted. Materials that can be directly brazed include iron, nickel, titanium, stainless steel, and copper.
When the constituent material is made of stainless steel, ceramics or the like and the brazing property is not good, the material having good brazing property is coated on the surface by a method such as plating, thermal spraying or ion plating. Among the plating, electrolytic nickel plating and electroless nickel plating are excellent in brazing property of aluminum. In addition, the dissimilar materials include those having an Al alloy as a constituent material and a coating layer other than the Al alloy formed on the surface thereof for the purpose of decoration or the like. The point is that at least the brazing part is made of a material other than Al alloy.
【0010】なお異種材料の一例として、ステンレス鋼
が挙げられるが、従来、真空、熱交換の分野でステンレ
ス/アルミニウム合金のトランジションピースを使用
し、ステンレス鋼はステンレス鋼と溶接し、アルミニウ
ム材はアルミニウム材と溶接するようにして、夫々同種
材料と接合していた。しかし、ステンレス/アルミニウ
ム合金のトランジションピースは通常、爆着・摩擦圧接
で製作されており、非常に高価であり、しかも爆着・摩
擦圧接では接合する形状もある程度限定されてしまう
が、真空ろう付では形状による制約がないので、自由な
形状が選択できる。そこでステンレスの表面にニッケル
メッキ(実施例ではニッケルストライク後、電気ニッケ
ルメッキ)を施せば、ステンレス表面にインサート材を
配置したり、他の高価なイオンプレーティング等の方法
を採用することなく安価で、容易な方法で真空ろう付が
可能になる。また、電気ニッケルメッキでなく、ニッケ
ルリンメッキを施すと、リンの影響で接合部に微細なク
ラックが入ることが判明した。このためニッケルメッキ
中のリンの量は0.1%以下とするのが望ましい。As an example of the dissimilar material, stainless steel can be cited. Conventionally, a transition piece of stainless / aluminum alloy has been used in the fields of vacuum and heat exchange, the stainless steel is welded to the stainless steel, and the aluminum material is aluminum. Each of them was welded to the same material and joined to the same material. However, stainless / aluminum alloy transition pieces are usually manufactured by explosion welding / friction welding, which is very expensive, and the shape to be joined by explosion welding / friction welding is also limited to a certain extent. Since there is no restriction due to the shape, you can select any shape you like. Therefore, if the surface of stainless steel is nickel-plated (in the example, after nickel strike and then electro-nickel plating), it is cheap without placing insert materials on the surface of stainless steel or adopting other expensive ion plating methods. Vacuum brazing is possible with an easy method. It was also found that when nickel-phosphorus plating was applied instead of electric nickel plating, fine cracks were formed in the joint due to the effect of phosphorus. Therefore, it is desirable that the amount of phosphorus in the nickel plating be 0.1% or less.
【0011】次に本願発明におけるろう材としては、代
表的にはSiを重量%で5〜15%含むAl −Si系の
ものが挙げられるが、本願発明としてはこれに限定され
るものではなく、要は、Mg含有量を0.1%以下(望
ましくは0.05%以下)に規制したものであればよ
い。 また、Mgと同様にろう付時に蒸散する元素はで
きるだけ含有しないのが望ましく、犠牲陽極作用などを
目的として添加されるZnも重量%で0.1%以下とす
るのが望ましい。また、MgとZnの合計量も0.1%
以下、さらには0.05%以下に規制するのが望まし
い。Next, the brazing filler metal in the present invention is typically an Al-Si based one containing 5 to 15% by weight of Si, but the present invention is not limited to this. The point is that the Mg content may be regulated to 0.1% or less (desirably 0.05% or less). Further, like Mg, it is desirable to contain as little elements as possible that evaporate during brazing, and Zn added for the purpose of sacrificial anode action or the like is also preferably 0.1% or less by weight. The total amount of Mg and Zn is 0.1%.
Below, it is desirable to further regulate to 0.05% or less.
【0012】また、ろう材は置きろうとして用いたり、
Al合金の片面にまたは両面にクラッドしたブレージン
グシートとして提供されるものが含まれる。さらに異種
材料にAl合金ろう材をクラッドしたものも含まれる。
ブレージングシートにおいて、ろう材を片面にだけクラ
ッドする場合には、他面は露出させておく他に、他部
材、例えば犠牲陽極皮材をクラッドしたものであっても
よい。In addition, the brazing material is used as a brazing material,
Included are those provided as brazing sheets of Al alloy clad on one or both sides. Furthermore, a material in which an Al alloy brazing material is clad to a different material is also included.
In the brazing sheet, when the brazing material is clad on only one side, the other side may be left exposed and other members such as a sacrificial anode skin material may be clad.
【0013】ろう材およびAl合金のろう付加熱前の酸
化皮膜厚の調整は、硝酸や硫酸を用いた酸処理によって
行われる。処理対象は材料全体が必須となるものではな
く、少なくともろう付部が対象となっていればよい。こ
の酸処理は、通常は浸漬によって行うが、塗布や噴霧に
よって行うことも可能である。なお酸処理に先立って
は、脱脂などの前処理を行うことも可能であり、苛性処
理した後、酸処理するのが望ましい。また酸処理後は、
通常、処理表面の洗浄を行うが、酸化皮膜の変質や成長
を避けるために純水で洗浄するのが望ましい。The oxide film thickness of the brazing material and the Al alloy before the brazing heat is adjusted by acid treatment using nitric acid or sulfuric acid. The material to be treated is not necessarily the whole material, and at least the brazing part may be treated. This acid treatment is usually carried out by dipping, but it can also be carried out by coating or spraying. Prior to the acid treatment, pretreatment such as degreasing can be performed, and it is desirable to perform the acid treatment after the caustic treatment. After acid treatment,
Normally, the treated surface is washed, but it is desirable to wash with pure water in order to avoid deterioration and growth of the oxide film.
【0014】[0014]
【作用】一般的に大気中放置でAl合金の表面に形成さ
れる酸化皮膜は多孔性の皮膜であり、酸化の進行過程で
は酸素分子が孔や亀裂から侵入してAl合金と盛んに接
触するので、酸化皮膜は等速的に成長し、特に加熱によ
って厚さが急速に増す。これに対し、加熱によっても成
長しにくい薄い酸化皮膜は、皮膜欠陥の極めて少ない、
つまりバリア性の高い、緻密な酸化皮膜である。緻密な
酸化皮膜では拡散によって酸化が進行するので、皮膜の
成長は減速し、成長が抑えられる。 本発明者らは、緻
密な酸化皮膜は上記した大気中放置では容易に形成され
ず、酸、特に硝酸や硫酸中に材料を浸漬することによっ
て初めて得られることを見出した。なお酸処理によっ
て、酸化皮膜は薄くち密な不働態皮膜となるので、酸に
よっても侵食を受けにくく緻密性が維持される。[Function] Generally, an oxide film formed on the surface of an Al alloy when left in the air is a porous film, and oxygen molecules infiltrate through pores and cracks and actively contact with the Al alloy during the progress of oxidation. Therefore, the oxide film grows at a constant rate, and in particular, the thickness thereof is rapidly increased by heating. On the other hand, a thin oxide film that does not easily grow even when heated has very few film defects.
In other words, it is a dense oxide film having a high barrier property. In a dense oxide film, oxidation progresses by diffusion, so the growth of the film is slowed down and suppressed. The present inventors have found that a dense oxide film is not easily formed by leaving it in the atmosphere as described above, and can be obtained only by immersing the material in an acid, particularly nitric acid or sulfuric acid. Since the oxide film becomes a thin and dense passive film by the acid treatment, it is hard to be corroded by acid and the denseness is maintained.
【0015】すなわち本願発明によれば、ろう付前にろ
う材およびAl合金材の表面酸化皮膜は、所定の厚さ以
内に規制され、さらに加熱中の皮膜成長も抑えられてい
るので、Mgが材料中に包含されていなくとも、ろうは
安定して良好な流動性を有している。さらに、ろう付環
境を10-5Torr以下の高真空に制御することにより
一層ろう付性が向上し、良好にろう付を行うことができ
る。そして、ろう付中におけるMgの蒸散は全くない
か、殆ど無視できるので、ろう付雰囲気およびろう付品
の汚染を防止できる。得られたろう付品は、良好に接合
されているとともに、表面層に酸化物などの形でMgが
残存することはなく、優れた表面光沢を有している。That is, according to the present invention, since the surface oxide film of the brazing material and the Al alloy material is regulated within a predetermined thickness before brazing and the film growth during heating is suppressed, Mg is not contained. Even if not included in the material, the wax has a stable and good flowability. Further, by controlling the brazing environment to a high vacuum of 10 -5 Torr or less, the brazing property is further improved and good brazing can be performed. Further, since there is no evaporation of Mg during the brazing or it can be almost ignored, it is possible to prevent the brazing atmosphere and the brazed product from being contaminated. The brazed product obtained has excellent surface gloss, with good bonding and no Mg remaining in the surface layer in the form of oxide or the like.
【0016】次に、本願発明における条件の限定理由を
述べる。 1)Mg含有量:0.1%以下 Al合金材、ろう材にMgを0.1%を越えて含有させ
ると、ろう付中に蒸散して、雰囲気内(真空炉)および
ろう付品を汚染し、また、ろう付品の光沢を失わせるの
で、上限を0.1%とする。 またAl合金材、ろう材
の不可避不純物中のMg含有量を0.05%以下にする
と、ろう付品の汚染はさらに少なくなり、表面の光沢も
良く、炉の汚染も防げるのでMg:0.05%とするの
が望ましい。Next, the reasons for limiting the conditions in the present invention will be described. 1) Mg content: 0.1% or less When an Al alloy material or brazing material contains Mg in excess of 0.1%, it evaporates during brazing, so that the atmosphere (vacuum furnace) and brazed products Since it contaminates and loses the luster of the brazed product, the upper limit is made 0.1%. Further, when the content of Mg in the unavoidable impurities of the Al alloy material and the brazing material is set to 0.05% or less, the contamination of the brazed product is further reduced, the surface gloss is good, and the contamination of the furnace can be prevented. It is desirable to set it to 05%.
【0017】2)酸化皮膜厚さ:200Å以下 Al合金材、ろう材の酸化皮膜が200Åを越えるとろ
うの流動を著しく阻害してろう付性を低下させるので2
00Åを上限とする。同様の理由でろう付加熱中の皮膜
厚さを150Å以下とするのが望ましい。また、ろう付
加熱前においては、加熱中の若干の皮膜の成長を考慮し
て100Å以下に制限するのが望ましい。2) Oxide film thickness: 200 Å or less If the oxide film of Al alloy material or brazing material exceeds 200 Å, braze flow is significantly impaired and brazeability is reduced.
The upper limit is 00Å. For the same reason, it is desirable that the thickness of the coating film during the brazing heat be 150 Å or less. In addition, before the brazing heat is added, it is desirable to limit it to 100 Å or less in consideration of a slight film growth during heating.
【0018】3)雰囲気:10-5Torr以下 Mgを殆ど含有させないことによるろうのぬれ性の低下
を防ぐために、前記した酸化皮膜の制御に加えて、ろう
付雰囲気を制御することにより、ろう付性を向上させ
る。ここで、雰囲気圧が10-5Torrより真空度が低
いと雰囲気中の微小水分量が増えてろう付性が悪くなる
ので、上記範囲が望ましい。なお、同様の理由で雰囲気
圧を10-6Torr以下とするのがさらに望ましい。3) Atmosphere: 10 -5 Torr or less In order to prevent the deterioration of the wettability of the braze due to almost no inclusion of Mg, the brazing is controlled by controlling the brazing atmosphere in addition to the control of the oxide film described above. Improve sex. Here, if the atmospheric pressure is lower than 10 −5 Torr and the degree of vacuum is lower, the amount of minute water in the atmosphere increases and the brazing property deteriorates. For the same reason, it is more desirable to set the atmospheric pressure to 10 −6 Torr or less.
【0019】[0019]
【実施例】 (実施例1)1mm厚のJIS A3003合金板1
と、JIS A3003合金を芯材としてその両面にA
l−Si合金ろう材(JIS A4045)を10%厚
でクラッドした0.5mm厚のブレージングシート2と
を用意した。上記で使用したJIS A3003合金と
JIS A4045合金に含まれるMg量はそれぞれ
0.01、0.02重量%であった。Example 1 Example 1 JIS A3003 alloy plate 1 with a thickness of 1 mm
And JIS A3003 alloy as core material
A brazing sheet 2 having a thickness of 0.5 mm, in which an l-Si alloy brazing material (JIS A4045) was clad at a thickness of 10% was prepared. The amounts of Mg contained in the JIS A3003 alloy and the JIS A4045 alloy used above were 0.01 and 0.02% by weight, respectively.
【0020】なお、上記JIS A3003合金板1に
ついては、(1)溶剤脱脂のみのもの、(2)10%苛
性ソーダ液中で脱脂後、水洗したもの、(3)10%苛
性ソーダ液中で脱脂、水洗後、直ちに15%硝酸中へ浸
漬し、水洗、乾燥したもの、(4)(3)の硝酸への浸漬
時間を短縮したもの、(5)(3)の硝酸を15%硫酸に
変えて同様の処理を行ったもの、をそれぞれ用意し、ブ
レージングシート2には(3)の処理を行った。次い
で、図1に示すように上記合金板1、1間にブレージン
グシート2を立てた状態で組合わせ、10-6Torrの
雰囲気下で600℃、5分間保持の真空ろう付を行っ
た。 これら供試材のろう付性試験結果についてろう付
前後のJISA3003板の酸化皮膜厚さとともに表1
に示した。表1から明らかなように、本発明の方法で
は、ろう付時においても酸化皮膜の成長が抑えられてお
り、良好なろう付性が得られていた。Regarding the above JIS A3003 alloy sheet 1, (1) solvent degreasing only, (2) degreasing in 10% caustic soda solution, followed by washing with water, (3) degreasing in 10% caustic soda solution, Immediately after washing with water, soak in 15% nitric acid, then wash with water, dry, (4) (3) shortened dipping time in nitric acid, (5) (3) change nitric acid to 15% sulfuric acid Those subjected to the same treatment were prepared, and the brazing sheet 2 was subjected to the treatment (3). Next, as shown in FIG. 1, the brazing sheet 2 was assembled between the alloy plates 1 and 1 in a standing state, and vacuum brazing was carried out at 600 ° C. for 5 minutes in an atmosphere of 10 −6 Torr. The results of the brazing test of these test materials are shown in Table 1 together with the oxide film thickness of JISA3003 plate before and after brazing.
It was shown to. As is clear from Table 1, in the method of the present invention, the growth of the oxide film was suppressed even during brazing, and good brazing properties were obtained.
【0021】[0021]
【表1】 [Table 1]
【0022】(実施例2)次に実施例2を以下に説明す
る。アルミパイプ3は、JIS A3003アルミニウ
ム合金とJIS A4343アルミニウム合金ろう材を
クラッドしたブレージングシートを切削したパイプ形状
からなり、それぞれMgとZn含有量を各0.01%に
規制している。上記アルミパイプ3は、ろう付け前の前
処理として、60℃10%NaOH溶液に30秒浸漬
後、硝酸15%溶液に1分浸漬して表面酸化皮膜を50
Åに調整した後、イオン交換した純水で洗浄した。ま
た、比較例として60℃10%NaOH溶液に30秒浸
漬後、酸への浸漬を行うことなく純水で洗浄して表面酸
化皮膜を120Åに調整したアルミパイプを用意した。(Embodiment 2) Next, Embodiment 2 will be described below. The aluminum pipe 3 has a pipe shape obtained by cutting a brazing sheet clad with a JIS A3003 aluminum alloy and a JIS A4343 aluminum alloy brazing material, and the Mg and Zn contents are regulated to 0.01% each. As a pretreatment before brazing, the aluminum pipe 3 is immersed in a 10% NaOH solution at 60 ° C. for 30 seconds and then immersed in a 15% nitric acid solution for 1 minute to form a surface oxide film on the surface.
After adjusting to Å, it was washed with ion-exchanged pure water. Further, as a comparative example, an aluminum pipe having a surface oxide film adjusted to 120 Å was prepared by immersing in a 10% NaOH solution at 60 ° C. for 30 seconds and then washing with pure water without immersion in acid.
【0023】次にろう付対象となる相手材のステンレス
パイプ4は、SUS304ステンレス鋼をパイプ形状に
切削したものであり、表面にニッケルストライク処理
後、電気ニッケルメッキを施し、ろう付前に、アセトン
で超音波洗浄を行った。次いで、アルミパイプ3のろう
材3a側を内側、アルミニウム合金3b側を外側にし
て、アルミパイプ3とステンレスパイプ4とを突き合わ
せ、治具でクランプして真空ろう付炉に投入した。炉内
では、10-6Torrの真空度で、605℃、10分間
保持の真空ろう付を行った。得られた供試材のアルミパ
イプ表面の酸化皮膜厚を測定するとともに供試材のろう
付性について評価し、その結果を表2に示した。表2か
ら明らかなように、異種材料をろう付した本実施例で
も、発明法によれば良好なろう付性が得られている。Next, the mating material stainless steel pipe 4 to be brazed is SUS304 stainless steel cut into a pipe shape. The surface of the pipe is nickel-strike-treated and then electro-nickel plated. Ultrasonic cleaning was performed. Next, with the brazing material 3a side of the aluminum pipe 3 inside and the aluminum alloy 3b side outside, the aluminum pipe 3 and the stainless steel pipe 4 were butted against each other, clamped with a jig, and put into a vacuum brazing furnace. In the furnace, vacuum brazing was carried out at a vacuum degree of 10 −6 Torr at 605 ° C. for 10 minutes. The oxide film thickness on the surface of the aluminum pipe of the obtained test material was measured, and the brazing property of the test material was evaluated. The results are shown in Table 2. As is clear from Table 2, even in the present example in which different materials were brazed, good brazing properties were obtained by the inventive method.
【0024】[0024]
【表2】 [Table 2]
【0025】(実施例3)1mm厚のJIS1種のTi
板同士をT型に組み立てて、隅肉部に沿って、1mm径
のワイヤ状のJIS A4045ろう材を配置した。こ
のJIS A4045ろう材はMg量が0.01重量%
以下であり、予め苛性処理後、15%硝酸に浸漬し、さ
らに純水で洗浄して表面の酸化皮膜を50Åに調整し
た。上記材料を真空炉内におき、10-6Torrの雰囲
気下で600℃、5分間保持の真空ろう付を行った。
得られたろう付品は良好に接合されており、ろう付性に
問題がないことが確認された。また、ろう付部の表面の
光沢にも優れていた。なお、上記ろう材のろう付後の酸
化皮膜厚さを測定したところ、55Åであった。また、
JIS2種、3種のTi板についても同様のろう付試験
を行ったが、いずれも良好なろう付性が得られた。(Example 3) 1 mm thick JIS Class 1 Ti
The plates were assembled into a T shape, and a wire-shaped JIS A4045 brazing material having a diameter of 1 mm was arranged along the fillet portion. This JIS A4045 brazing filler metal has a Mg content of 0.01% by weight.
After the caustic treatment, it was immersed in 15% nitric acid and washed with pure water to adjust the surface oxide film to 50 Å. The above materials were placed in a vacuum furnace and vacuum brazed at 600 ° C. for 5 minutes in an atmosphere of 10 −6 Torr.
It was confirmed that the obtained brazed product was well joined and there was no problem in brazing property. Also, the surface of the brazed part was excellent in gloss. The thickness of the oxide film after brazing of the brazing material was measured and found to be 55Å. Also,
Similar brazing tests were conducted on JIS Type 2 and Type 3 Ti plates, but good brazing properties were obtained.
【0026】[0026]
【発明の効果】以上説明したように、本願発明の真空ろ
う付方法によれば、ろう材、Al合金材の不純物中のM
g含有量を重量%で0.1%以下にし、かつ、酸化皮膜
厚さをろう付加熱前、ろう付加熱中において200Å以
下としたので、ろうの良好な流動性が安定して得られ、
ろう付用の材料は良好に接合される、さらにろう付中の
Mgの蒸散による汚染を防止でき、その結果、十分な表
面光沢を有し、良好に接合されたろう付品が得られる。
しかも、ろう付環境の汚染が防止されているので、真空
炉などの装置の清掃が不要となり、作業能率が向上す
る。As described above, according to the vacuum brazing method of the present invention, M in the impurities of the brazing material and the Al alloy material is
Since the g content is 0.1% or less by weight and the oxide film thickness is 200 Å or less before and during the heat of brazing, a good brazing fluidity can be stably obtained.
The material for brazing is well joined, and further, contamination due to evaporation of Mg during brazing can be prevented, resulting in a well joined brazed article having sufficient surface gloss.
Moreover, since the brazing environment is prevented from being contaminated, it is not necessary to clean a device such as a vacuum furnace, and the work efficiency is improved.
【図1】 図1は、本発明の一実施例の斜視図である。FIG. 1 is a perspective view of an embodiment of the present invention.
【図2】 図2は、同じく他の実施例の斜視図である。FIG. 2 is a perspective view of another embodiment of the present invention.
1 合金板 2 ブレージングシ
ート 3 アルミパイプ 4 ステンレスパイ
プ1 Alloy plate 2 Brazing sheet 3 Aluminum pipe 4 Stainless steel pipe
───────────────────────────────────────────────────── フロントページの続き (72)発明者 当摩 建 静岡県裾野市平松85番地 三菱アルミニウ ム株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toma Ken 85 Hiramatsu, Susono, Shizuoka Prefecture Mitsubishi Aluminum Co., Ltd.
Claims (4)
金材のMg含有量をそれぞれ0.1重量%以下に規制
し、かつ酸処理によってそれぞれの少なくともろう付部
の酸化皮膜厚さをろう付加熱前において200Å以下と
し、これら材料を10-5Torr以下の真空下で加熱す
るとともに加熱中の前記酸化皮膜厚さをそれぞれ200
Å以下に抑えてAl合金材同士をろう付することを特徴
とする真空ろう付法1. An Al alloy brazing material and an Al alloy material for brazing are each controlled to have a Mg content of 0.1% by weight or less, and at least the oxide film thickness of each brazing portion is brazed by acid treatment. Before the heat is applied, the pressure is set to 200 Å or less, these materials are heated under a vacuum of 10 -5 Torr or less, and the thickness of the oxide film during heating is 200
Å Vacuum brazing method characterized by brazing Al alloy materials to each other with the pressure kept below
のMg含有量をそれぞれ0.1重量%以下に規制し、か
つ酸処理によってそれぞれの少なくともろう付部の酸化
皮膜厚さをろう付加熱前において200Å以下とし、こ
れら材料と同じくろう付用の異種材料とを10-5Tor
r以下の真空下で加熱するとともに加熱中の前記酸化皮
膜厚さをそれぞれ200Å以下に抑えてAl合金材と異
種材料とをろう付することを特徴とする真空ろう付法2. The Mg content of the Al alloy brazing material and the Al alloy material for brazing are regulated to 0.1 wt% or less, respectively, and the oxide film thickness of at least the brazing part is brazed by acid treatment. Before applying heat, it should be 200 Å or less, and these materials and other materials for brazing should be 10 -5 Torr.
A vacuum brazing method characterized by heating under a vacuum of r or less and brazing an Al alloy material and a dissimilar material while suppressing the thickness of the oxide film during heating to 200 Å or less, respectively.
量%以下に規制し、かつ酸処理によって少なくともろう
付部の酸化皮膜厚さをろう付加熱前において200Å以
下とし、このAl合金ろう材とろう付用の異種材料とを
10-5Torr以下の真空下で加熱するとともに加熱中
の前記酸化皮膜厚さを200Å以下に抑えて異種材料同
士をろう付することを特徴とする真空ろう付法3. An Al alloy brazing material, the Mg content of which is regulated to 0.1% by weight or less, and at least the oxide film thickness of the brazing portion is made 200 Å or less before brazing heat by acid treatment. A vacuum characterized by heating a brazing material and a dissimilar material for brazing under a vacuum of 10 -5 Torr or less and brazing the dissimilar materials while suppressing the thickness of the oxide film during heating to 200 Å or less. Brazing method
00Å以下、ろう付加熱中において150Å以下に制限
したことを特徴とする請求項1〜3のいずれかに記載の
真空ろう付方法4. The oxide film thickness is set to 1 before heat for brazing.
The method of vacuum brazing according to any one of claims 1 to 3, characterized in that it is limited to 00 Å or less and to 150 Å or less during heat applied by brazing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12986894A JPH07314129A (en) | 1994-05-20 | 1994-05-20 | Vacuum brazing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12986894A JPH07314129A (en) | 1994-05-20 | 1994-05-20 | Vacuum brazing method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07314129A true JPH07314129A (en) | 1995-12-05 |
Family
ID=15020285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12986894A Pending JPH07314129A (en) | 1994-05-20 | 1994-05-20 | Vacuum brazing method |
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Country | Link |
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JP (1) | JPH07314129A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002009212A (en) * | 2000-06-23 | 2002-01-11 | Denki Kagaku Kogyo Kk | Method for manufacturing heat dissipation structure |
JP2013063485A (en) * | 2011-09-16 | 2013-04-11 | Allied Material Corp | Rotary cutting tool and method of manufacturing the same |
KR101272981B1 (en) * | 2010-06-04 | 2013-06-10 | 김동열 | Ultrasound magnetostriction transducer for sonochemistry application and method of manufacturing for the same |
JP2014055543A (en) * | 2012-09-12 | 2014-03-27 | Toshiba Corp | Transition piece damage repair method and transition piece |
CN107052493A (en) * | 2017-04-10 | 2017-08-18 | 河南科技大学 | A kind of brazing device and method for welding of many auxiliary |
CN108431260A (en) * | 2015-12-28 | 2018-08-21 | 株式会社Uacj | The manufacturing method of aluminum alloy brazing sheet and aluminum alloy heat exchanger |
-
1994
- 1994-05-20 JP JP12986894A patent/JPH07314129A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002009212A (en) * | 2000-06-23 | 2002-01-11 | Denki Kagaku Kogyo Kk | Method for manufacturing heat dissipation structure |
KR101272981B1 (en) * | 2010-06-04 | 2013-06-10 | 김동열 | Ultrasound magnetostriction transducer for sonochemistry application and method of manufacturing for the same |
JP2013063485A (en) * | 2011-09-16 | 2013-04-11 | Allied Material Corp | Rotary cutting tool and method of manufacturing the same |
JP2014055543A (en) * | 2012-09-12 | 2014-03-27 | Toshiba Corp | Transition piece damage repair method and transition piece |
CN108431260A (en) * | 2015-12-28 | 2018-08-21 | 株式会社Uacj | The manufacturing method of aluminum alloy brazing sheet and aluminum alloy heat exchanger |
US20190151973A1 (en) * | 2015-12-28 | 2019-05-23 | Uacj Corporation | Aluminum alloy brazing sheet and method for manufacturing heat exchanger formed of aluminum alloy |
CN107052493A (en) * | 2017-04-10 | 2017-08-18 | 河南科技大学 | A kind of brazing device and method for welding of many auxiliary |
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