JPH01143795A - Method for brazing aluminum - Google Patents
Method for brazing aluminumInfo
- Publication number
- JPH01143795A JPH01143795A JP29772087A JP29772087A JPH01143795A JP H01143795 A JPH01143795 A JP H01143795A JP 29772087 A JP29772087 A JP 29772087A JP 29772087 A JP29772087 A JP 29772087A JP H01143795 A JPH01143795 A JP H01143795A
- Authority
- JP
- Japan
- Prior art keywords
- flux
- brazing
- aluminum materials
- brazed
- aluminum
- 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.)
- Granted
Links
- 238000005219 brazing Methods 0.000 title claims abstract description 81
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 48
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims abstract description 61
- 230000004907 flux Effects 0.000 claims abstract description 54
- 229920001083 polybutene Polymers 0.000 claims abstract description 20
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229920001577 copolymer Polymers 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims 1
- BHHYHSUAOQUXJK-UHFFFAOYSA-L zinc fluoride Chemical compound F[Zn]F BHHYHSUAOQUXJK-UHFFFAOYSA-L 0.000 abstract description 12
- 239000002612 dispersion medium Substances 0.000 abstract description 11
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 230000006866 deterioration Effects 0.000 abstract description 2
- 235000010210 aluminium Nutrition 0.000 abstract 5
- 229910020440 K2SiF6 Inorganic materials 0.000 abstract 2
- 229910000679 solder Inorganic materials 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 20
- 238000005260 corrosion Methods 0.000 description 20
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 239000000725 suspension Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000005253 cladding Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009972 noncorrosive effect Effects 0.000 description 2
- 208000014451 palmoplantar keratoderma and congenital alopecia 2 Diseases 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 229960003280 cupric chloride Drugs 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000004018 waxing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【発明の詳細な説明】
ａ８発明の目的
（産業上の利用分野）
この発明に係るアルミニウム材のろう付方法は、アルミ
ニウム、或はアルミニウム合金（本明細書では、これら
を総称してアルミニウム材とする。）同士をろう付して
、各種製品を造る場合に利用するもので、例えばコンデ
ンサ等として使用されるアルミニウム材製の熱交換器を
造る場合に利用される。Detailed Description of the Invention a8 Object of the Invention (Field of Industrial Application) The method for brazing aluminum materials according to the present invention is applicable to brazing aluminum or aluminum alloys (herein, these are collectively referred to as aluminum materials). It is used to manufacture various products by brazing (brazing) together.For example, it is used to manufacture heat exchangers made of aluminum material used as capacitors, etc.
（従来の技術）
例えばアルミニウム材製の熱交換器を造る場合、アルミ
ニウム材製の伝熱管と、同じくアルミニウム材製の放熱
フィンとを組み合わせた状態で、これら伝熱管とフィン
とを加熱炉中で加熱し、予め伝熱管とフィンとの当接面
間に介在させたろう材（Ｓｉを５〜１６％含むアルミニ
ウム合金）を溶融させ、このろう材によって伝熱管とフ
ィンとをろう付けする様にしている。(Prior art) For example, when manufacturing a heat exchanger made of aluminum material, heat transfer tubes made of aluminum material and heat radiation fins also made of aluminum material are combined, and these heat transfer tubes and fins are placed in a heating furnace. Heat to melt the brazing material (aluminum alloy containing 5 to 16% Si) interposed between the contact surfaces of the heat exchanger tube and the fins, and use this brazing material to braze the heat exchanger tube and the fins. There is.
このろう付作業の際、伝熱管やフィンを構成しているア
ルミニウム材の表面の酸化膜を破壊して、伝熱管とフィ
ンとのろう付が良好に行なわれる様にする為、ろう付部
にフラックスを塗布する事が広く行なわれている。During this brazing work, in order to destroy the oxide film on the surface of the aluminum material that makes up the heat transfer tubes and fins, and to ensure good brazing between the heat transfer tubes and fins, Applying flux is widely practiced.
この様なアルミニウム材同士のろう付に使用するフラッ
クスとして従来は一般に、アルカリ金属やアルカリ土類
金屑のハロゲン化物と、ＡＩ、 Ｚｎ１Ｍｇのハロゲン
化物とを混合したフラックスが広く使用されていた。Conventionally, as a flux used for brazing aluminum materials together, a mixture of halides of alkali metals and alkaline earth metal scraps and halides of AI and Zn1Mg has been widely used.
更に、ろう付後の残漬がアルミニウム材に対する腐食性
を持たないフラックスとして、英国特許第１０５５９１
４号明細書には、４５〜４７％（本明細書に於ける１％
」は、後述のクラツド率、或は長さの割合を表わす場合
を除き、混合割合を表わす場合は総て１重量％」である
、）のＫＦと５５〜５３％のＡＩＦｓとを混合したもの
が開示されている。Furthermore, British Patent No. 105591 is used as a flux whose residue after brazing is not corrosive to aluminum materials.
Specification No. 4 states that 45 to 47% (1% in this specification)
`` is 1% by weight in all cases where the mixture ratio is expressed, except when expressing the clad ratio or length ratio described below.'') A mixture of KF and 55 to 53% AIFs. is disclosed.
（発明が解決しようとする問題点）
ところが、上述の様なフラックスを使用して行なう、従
来のアルミニウム材のろう付に於いては、次に述べる様
な不都合を生じる。(Problems to be Solved by the Invention) However, in the conventional brazing of aluminum materials using the above-mentioned flux, the following disadvantages occur.
即ち、従来のろう付方法に於いては、何れのフラックス
を使用する場合に於いても、水を分散媒として使用し、
ろう付に使用するフラックスを分散媒としての水の中に
所定濃度で分散し、懸濁液としていた。That is, in conventional brazing methods, no matter which flux is used, water is used as a dispersion medium,
The flux used for brazing was dispersed in water as a dispersion medium at a predetermined concentration to form a suspension.
この懸濁液は、ろう付性にろう材部分に塗布するが、フ
ラックスは本来、伝熱管とフィンとの接触部等、ろう付
は部にのみ塗布すれば良く、それ以外の部分に塗布して
も、フラックスが無駄に消費されるだけでなく、ろう付
後の残渣がフィンの表面に付着して通気抵抗を増大させ
たり、残渣が著しく多い場合には、この残渣がフィンを
詰らせたりしてしまう。This suspension is applied to the brazing material part for brazing properties, but flux originally only needs to be applied to the brazing parts, such as the contact area between the heat exchanger tube and the fin, and should not be applied to other parts. However, not only is flux wasted, but residue after brazing may adhere to the surface of the fins, increasing ventilation resistance, or if there is a significant amount of residue, this residue may clog the fins. I end up doing something like that.
ところが、水を分散媒として使用した場合、フラックス
の懸濁液の粘度は掻く小さいものとなって（流動性が極
めて良くなって）、この懸濁液をろう付部にのみ塗布す
る事は極めて困難となる。However, when water is used as a dispersion medium, the viscosity of the flux suspension becomes extremely small (fluidity becomes extremely good), and it is extremely difficult to apply this suspension only to the brazed parts. It becomes difficult.
この為従来は、ろう付に必要な部分だけでなく、それ以
外の部分にもフラックスの懸濁液を、スプレー等によフ
て塗布していた為、ろう付は後に上述の様な問題が生じ
る事が避けられなかった。For this reason, in the past, a flux suspension was applied not only to the parts necessary for brazing but also to other parts by spraying, which caused problems such as those mentioned above later in brazing. It was inevitable that it would happen.
又、フラックス中にＺｎ化合物（特願昭６２−８９５５
号、同６２−２５９４６２号に開示されている様に、Ｚ
ｎＦ２が、残渣に腐食性がない事から、好ましく使用さ
れる。）を混入し、この２ｎ化合物中のＺｎを、ろう付
部にアルミニウム材中に拡散させて、このアルミニウム
材の防食を図る様な場合、分散媒として水を使用すると
、Ｚｎ化合物の分散が不均一になり易く、部分的に十分
な防食効果を発揮出来ない場合が生じる。アルミニウム
材製熱交換器の場合、その掻く一部でも耐久性が劣って
いた場合、全体としての耐久性に問題が生じる（全体と
しての耐久性は、最も劣っている部分で決定される。）
。In addition, a Zn compound (patent application 1989-8955) is added to the flux.
No. 62-259462, Z
nF2 is preferably used since its residue is non-corrosive. ), and the Zn in this 2n compound is diffused into the aluminum material at the brazed part to prevent corrosion of the aluminum material. If water is used as a dispersion medium, the Zn compound will not be dispersed properly. It tends to become uniform, and there may be cases where sufficient anticorrosion effect cannot be achieved in some areas. In the case of an aluminum heat exchanger, if even one part of the heat exchanger has poor durability, there will be a problem with the overall durability (the overall durability is determined by the worst part).
.
分散媒として水の代りに合成樹脂を使用する事も、前記
英国特許明細書に記載されている様に、一部で研究され
てはいるが、現状に於いては、合成樹脂を使用した場合
、ろう付部の加熱に伴なって合成樹脂が炭化する事で、
ろう付後に炭素粉末が残留し、ろう付性の面からも、残
渣処理の面からも好ましくないとされている。The use of synthetic resin instead of water as a dispersion medium has been studied in some areas, as described in the above-mentioned British patent specification, but at present, when synthetic resin is used, , as the synthetic resin carbonizes as the brazed part heats up,
Carbon powder remains after brazing, which is considered undesirable from both brazing properties and residue treatment.
フラックスを使用する事なく、アルミニウム材同士をろ
う付けする方法として、１０−３〜１０ ””Ｔｏｒｒ
の高真空中でろう付を行なう、真空ろう付性が知られて
いるが、この真空ろう付性の場合、防食の為にアルミニ
ウム材中、或はフラックス中に含有させたＺｎが、ろう
付の為の加熱時に飛散してしまい、Ｚｎを添加する事に
伴なう犠牲腐食作用が弱くなって、ろう付によって得ら
れるアルミニウム材製品に十分な耐食性を期特出来なく
なってしまう。As a method of brazing aluminum materials together without using flux, 10-3 to 10 ”” Torr
Vacuum brazing, in which brazing is performed in a high vacuum, is known. Zn scatters during heating, weakening the sacrificial corrosion effect associated with the addition of Zn, and making it impossible to achieve sufficient corrosion resistance in aluminum products obtained by brazing.
本発明のアルミニウム材のろう付方法は、フラックスの
分散媒を工夫する事で、上述の様な不都合を何れも解消
するものである。The method for brazing aluminum materials of the present invention eliminates all of the above-mentioned disadvantages by devising a flux dispersion medium.
ｂ９発明の構成
（問題を解決するための手段）
本発明のアルミニウム材のろう付方法に於いては、フラ
ックスを分散させる為の分散媒として、イソブチレンを
主体とする共重合体で末端に１個の二重結合を有し、構
造式
で表わされるポリブテンを使用する。b9 Structure of the invention (means for solving the problem) In the method for brazing aluminum materials of the present invention, a copolymer mainly composed of isobutylene is used as a dispersion medium for dispersing flux. A polybutene having a double bond represented by the structural formula is used.
ろう付を行なう場合には、この様なポリブテン中に、フ
ラックスを均一に分散混合したものを、対となって互い
にろう付けされるアルミニウム材の内の、少なくとも一
方のアルミニウム材の表面に塗布した後、上記対となる
アルミニウム材を非酸化性雰囲気中で加熱し、対となる
アルミニウム材の間に存在するろう材を溶融させる。When performing brazing, a mixture of flux uniformly dispersed in such polybutene is applied to the surface of at least one of the aluminum materials to be brazed to each other in a pair. Thereafter, the paired aluminum materials are heated in a non-oxidizing atmosphere to melt the brazing material present between the paired aluminum materials.
又、フラックスとしては、３０〜９０％のに２ＳｉＦ、
と、同じく基本組成物に対する割合が７０〜１０％のＺ
ｎＦ２とを混合して１００％としたもの（第一番目の発
明）、或は基本組成物に対する割合が３０〜９０％のに
２ＳＩＦＢと、同じく基本組成物に対する割合が７０〜
１０％のＺｎＦ２とから成り、フラックス全体に対する
割合が９８〜９０％の基本組成物と、フラックス全体に
対する割合が１〜３％のＮａＦと、同じく１〜７％の＾
ＩＦｓとから成るもの（第二番目の発明）を使用する。In addition, as a flux, 30 to 90% of 2SiF,
and Z, whose proportion to the basic composition is 70 to 10%.
nF2 to 100% (first invention), or 2SIFB with a proportion of 30 to 90% to the basic composition, and 2SIFB with a proportion of 70 to 90% of the basic composition.
A basic composition consisting of 10% ZnF2 with a proportion of 98-90% of the total flux, NaF with a proportion of 1-3% of the total flux, and also 1-7%^
IFs (second invention).
（作 用）
本発明のアルミニウム材のろう付方法に於いて、フラッ
クスの分散媒として使用されるポリブテンは、流動性は
あるにしても、水に比べて十分に大きな粘性を有する為
、フラックスを必要とするろう材部分にのみ、これを塗
布する事が可能となり、フラックスの使用量を少なく抑
えると同時に、ろう付後に於けるフラックス残渣を少な
くする事が出来る。(Function) In the method of brazing aluminum materials of the present invention, polybutene used as a flux dispersion medium has fluidity, but it has a sufficiently high viscosity compared to water, so it cannot be used as a flux dispersion medium. This makes it possible to apply the brazing material only to the necessary parts, thereby reducing the amount of flux used and at the same time reducing the amount of flux residue left after brazing.
又、ポリブテンは、アルミニウム材同士のろう付温度（
通常６００℃程度）以下の約３００℃で解重合して昇華
する為、ろう付後にカーボン残渣が生じる事もなく、ろ
う付性の悪化やフィンの目詰り等を生じる事もない。In addition, polybutene can be used at brazing temperatures between aluminum materials (
Because it depolymerizes and sublimates at about 300°C (normally about 600°C) or lower, no carbon residue is left after brazing, and no deterioration in brazing properties or clogging of fins occurs.
更に、ポリブテン中に分散混合するフラックスとして、
に、ＳｉＦ、とＺｎＦ、とを、或はに２ＳｉＦ６とＺｎ
Ｆ２とＮａＦとＡｌＦ３とを、それぞれ上述の様な割合
で混合したものを使用する為、ろう付後のフラックス残
漬が、アルミニウム材に対する腐食性を有しない様にな
り、耐食性を要する製品の場合に於いても、ろう付後に
このフラックス残漬を洗浄する必要がなくなるだけでな
く、ＺｎＦ、を含むフラックスを、（防食性を要しない
フィン等に塗布する事なく）防食性を要する伝熱管等の
所望部分にのみ塗布する事が出来る為、ろう付の為の加
熱に伴なって、上記所望部分にのみ、Ｚｎを均一に拡散
させる事が出来、この所望部分の防食を確実に図る事が
出来る。Furthermore, as a flux to be dispersed and mixed into polybutene,
, SiF, and ZnF, or 2SiF6 and Zn
Since a mixture of F2, NaF, and AlF3 is used in the proportions mentioned above, the residual flux after brazing will not be corrosive to aluminum materials, making it suitable for products that require corrosion resistance. Not only does it eliminate the need to clean this residual flux after brazing, but it also eliminates the need to apply ZnF-containing flux to heat transfer tubes, etc. that require corrosion protection (without applying it to fins, etc. that do not require corrosion protection). Since Zn can be applied only to the desired areas, Zn can be uniformly diffused only to the desired areas during the heating for brazing, and corrosion protection of these desired areas can be ensured. I can do it.
尚、フラックス全体、或は基本組成物に対するに２ＳＩ
Ｆ６とＺｎＦ２との混合割合を上述の範囲としたのは、
に２ＳｉＦａの含有量が３０％未満だと、ろう付性が悪
くなり、反対に含有量が９０％を越えた場合は、ＺｎＦ
２の含有量減少に伴なって、十分な防食性を期特出来な
くなる為である。In addition, 2SI for the entire flux or the basic composition
The mixing ratio of F6 and ZnF2 was set to the above range because
If the content of 2SiFa is less than 30%, the brazing properties will be poor, and on the other hand, if the content exceeds 90%, the ZnF
This is because as the content of 2 decreases, sufficient corrosion protection cannot be expected.
又、ＮａＦとＡｌＦ３とを加える場合に、これらの混合
割合を上述の範囲としたのは、ＮａＦとＡｌＦ３どの何
れに就いても、この混合割合を外れた場合には、これら
を加える事に伴なうろう付性の向上を得られない為であ
る。Also, when adding NaF and AlF3, the mixing ratio is set to the above range because, regardless of whether NaF or AlF3, if the mixing ratio is outside this range, the addition of these will result in This is because the brazing properties cannot be improved.
尚、ポリブテン中へのフラックスの添加量は、１０〜５
０％の範囲が好ましい。The amount of flux added to polybutene is 10 to 5.
A range of 0% is preferred.
この理由は、フラックスの添加量が１０％未満の場合、
フラックスの絶対量が不足して、ろう付性を悪化させ、
反対に５０％を越えて添加した場合、フラックスの分散
がなされずに流動性が悪くなり、ろう行部分への塗布が
困難となる為である。The reason for this is that when the amount of flux added is less than 10%,
Absolute amount of flux is insufficient, deteriorating brazing properties,
On the other hand, if it is added in excess of 50%, the flux will not be dispersed and fluidity will deteriorate, making it difficult to apply to the soldering area.
（実施例）
次に、本発明の効果を確認する為に行なった実験に就い
て説明する。(Example) Next, experiments conducted to confirm the effects of the present invention will be described.
先ず、本発明に於いて、フラックスの分散媒として使用
するポリブテンの加熱時に於ける変化を確認する為、分
子量が１０００のポリブテンを加熱炉中に入れ、このポ
リブテンの重量を測定しつつ、この加熱炉内の温度を第
１図の曲線ａで示す様に徐々に上昇させた所、ポリブテ
ンの重量は、同図に曲線すで示す様に減少し、４５０℃
程度でほぼ１００％昇華して、後には何の残漬も残らな
かった。First, in the present invention, in order to confirm changes during heating of polybutene used as a dispersion medium of flux, polybutene with a molecular weight of 1000 was placed in a heating furnace, and while measuring the weight of this polybutene, the heating When the temperature in the furnace was gradually increased as shown by curve a in Figure 1, the weight of polybutene decreased as shown by the curve in the same figure, reaching 450°C.
Almost 100% sublimation was achieved within a few minutes, and no residue was left behind.
この事から、ポリブテンが、アルミニウム材のろう付温
度である６００℃よりも低い温度で解重合し、完全に昇
華する事が解った。From this, it was found that polybutene depolymerizes and completely sublimates at a temperature lower than 600° C., which is the brazing temperature of aluminum material.
尚、ポリブテンとしては、分子量が２００〜２５００の
ものを使用出来るが、分子量によって粘度が異なる（分
子量が多い程、粘度が高くなる。分子量１０００のもの
で、粘度は１００００ｃｐ程度、）為、ろう行部分の形
状等に応じて適当な粘度（８０００ｃｐ程度のものが、
熱交換器製造の際に、好ましく使用出来る。）を有する
ポリブテンを選択する。但し、粘度を低下させる為なら
ば、ポリブテンを有機溶剤（パラフィン系炭化水素）に
よって希釈する事も出来る。Polybutene with a molecular weight of 200 to 2500 can be used, but the viscosity varies depending on the molecular weight (the higher the molecular weight, the higher the viscosity. If the molecular weight is 1000, the viscosity is about 10000 cp), so waxing is difficult. Appropriate viscosity (approximately 8000 cp is suitable depending on the shape of the part, etc.)
It can be preferably used when manufacturing heat exchangers. ) is selected. However, in order to lower the viscosity, polybutene can be diluted with an organic solvent (paraffinic hydrocarbon).
上述の様な性質を有するポリブテン中に混合するフラッ
クスとして、に２Ｓ＋Ｆ６とＺｎＦ２とのみから成り、
第１表に示した様な組成を有するものを使用して、第２
図に示した様なコンデンサのろう付を行なった。The flux to be mixed into polybutene having the above-mentioned properties consists only of 2S+F6 and ZnF2,
Using the composition shown in Table 1, the second
The capacitor was brazed as shown in the figure.
尚、本発明のろう付方法は、次の様な理由により、コン
デンサのろう付に好適である。The brazing method of the present invention is suitable for brazing capacitors for the following reasons.
即ち、アルミニウム材製のコンデンサ（エバポレータも
同様であるが、エバポレータの場合は、コンデンサ程防
食性を要求されない為、実用上、特に問題は生じ難い。That is, the same applies to capacitors (evaporators) made of aluminum material, but in the case of evaporators, corrosion resistance is not required as much as that of capacitors, and therefore problems are unlikely to occur in practice.
）を製造する場合は、内部に高圧の冷媒を流す伝熱管１
としてアルミニウム材製の引抜管を使用する為、伝熱管
１の表面にろう材をクラッドする事が出来ない、この為
、伝熱管１とフィン２とをろう付けする為のろう材は、
フィン２を構成するアルミニウム材の表面にクラッドす
る事になる。この様にフィン２の表面にクラッドされた
ろう材は、ろう付後に於いてもこのフィン２の表面を覆
い、その結果、ろう材により覆われたフィン２の表面の
電位が、ろう材により覆われていない伝熱管１の表面の
電位に比較して高く（責と）なる為、そのままでは、伝
熱管１が腐食し易くなってしまう。), heat transfer tube 1 with high-pressure refrigerant flowing inside.
Since a drawn tube made of aluminum is used as the material, it is not possible to clad the surface of the heat exchanger tube 1 with a brazing material. Therefore, the brazing material for brazing the heat exchanger tube 1 and the fins 2 is as follows.
The surface of the aluminum material constituting the fin 2 will be clad. The brazing filler metal clad on the surface of the fin 2 in this way covers the surface of the fin 2 even after brazing, and as a result, the potential of the surface of the fin 2 covered with the brazing filler metal is Since the potential of the surface of the heat exchanger tube 1 is higher than that of the surface of the heat exchanger tube 1 which is not heated, the heat exchanger tube 1 becomes easily corroded if left as is.
この様な場合に、本発明のろう付方法によって伝熱管１
とフィン２とをろう付けすれば、フラックス中に含まれ
ていたＺｎが伝熱管１を構成するアルミニウム材の表面
に均一に拡散し、この伝熱管１に孔食が発生する事を防
止する事が出来る。In such a case, the heat exchanger tube 1 can be bonded by the brazing method of the present invention.
By brazing the fins 2 and 2, the Zn contained in the flux will be uniformly diffused onto the surface of the aluminum material that makes up the heat exchanger tube 1, thereby preventing pitting corrosion from occurring in the heat exchanger tube 1. I can do it.
ろう付性、耐食性の実験を行なう場合に於いては、上述
の様にコンデンサ等として使用される熱交換器の伝熱管
１として、厚さが０．７ｍｍの引抜管を使用し、フィン
を構成する為のアルミニウム材製板材として、厚さ０．
１６ｍｍのクラツド板を使用した。When conducting experiments on brazing properties and corrosion resistance, as described above, a drawn tube with a thickness of 0.7 mm was used as the heat transfer tube 1 of a heat exchanger used as a condenser, etc., and a fin was constructed. As an aluminum plate material for
A 16 mm clad plate was used.
伝熱管１を構成するアルミニウム材としてはＪＩＳ １
０５０材（Ｓｉが０．２５％以下、Ｆｅが０．４０％以
下、Ｃｕが０．０５％以下、Ｍｎが０．０５％以下、Ｍ
ｇが０．０５％以下、２０が０．０５％以下、Ｔｉが０
．０３％以下、その他の不純物が、個々の物が０．０３
以下％で、残りを＾ｌとしたもの）を使用した。JIS 1 is used as the aluminum material constituting the heat exchanger tube 1.
050 material (Si 0.25% or less, Fe 0.40% or less, Cu 0.05% or less, Mn 0.05% or less, M
g is 0.05% or less, 20 is 0.05% or less, Ti is 0
．． 0.03% or less, other impurities, individual substances are 0.03% or less
(% below and the rest as ^l) was used.
又、フィン２を構成するクラツド板は、芯材の表面にろ
う材である皮材を、１０％のクラツド率（板全体の厚さ
に対するクラッド層（皮材層）の厚さの割合）で両面に
クラッド（両面で合計２０％）したもので、芯材にはＪ
ＩＳ ３００３材に１．０％のＺｎを添加したもの（Ｓ
ｉが０．６％以下、Ｆｅが０．７ ％以下、ＣｕがＯ，
ｆ１５〜０．２Ｑ％、Ｍｎが１．０〜１．５％、Ｚｎが
１．０％、その他の不純物が、個々の物が０．０５％以
下で、不純物の合計が０．１５％以下とし、残りをＡＩ
としたもの）を、皮材にはＪＩＳ ４０４５材に１．０
％のＺｎを添加したもの（ｓｉが９．０〜１１．０％、
Ｆｅが０．８％以下、Ｃｕが０．３０％以下、Ｍｎが０
．０５％以下、Ｚｎが１．０％、Ｔｉが０．２０％以下
、その他の不純物が、個々の物が０．０５％以下で、不
純物の合計が０．１５％以下とし、残りを＾ｌとしたも
の）を、それぞれ使用した。In addition, the cladding plate constituting the fin 2 has a skin material, which is a brazing material, on the surface of the core material at a cladding ratio of 10% (ratio of the thickness of the cladding layer (skinning material layer) to the thickness of the entire board). It is clad on both sides (total 20% on both sides), and the core material is J.
IS 3003 material with 1.0% Zn added (S
i is 0.6% or less, Fe is 0.7% or less, Cu is O,
f15~0.2Q%, Mn 1.0~1.5%, Zn 1.0%, other impurities individually less than 0.05%, total impurities less than 0.15% and the rest by AI
), and the skin material is JIS 4045 material 1.0
% of Zn (si is 9.0-11.0%,
Fe is 0.8% or less, Cu is 0.30% or less, Mn is 0
．． 0.05% or less, Zn 1.0%, Ti 0.20% or less, other impurities individually 0.05% or less, total impurities 0.15% or less, and the rest ^l ) were used, respectively.
この様なりラッド板により造られたフィン２と、前記し
たＪＩＳ １０５０材製の伝熱管１とを、第２図に示す
様に組み合わせ、本発明のろう付方法、従来の様に水を
分散媒として使用するろう付方法により、伝熱管１とフ
ィン２とを互いにろう付けした所、第１表に示す様な結
果を得られた。The fins 2 made of rad plates as described above and the heat transfer tubes 1 made of JIS 1050 material are combined as shown in FIG. When the heat exchanger tube 1 and the fin 2 were brazed to each other using the brazing method used in the present invention, the results shown in Table 1 were obtained.
尚、各ろう付方法を実施する場合に於いては、非腐食性
雰囲気としてＮ２ガス雰囲気を使用し、ろう何時に於け
る露点を一３０℃とし、ろう付を行なう際には、第２図
に示す様に組み合わされた伝熱管１とフィン２とを、１
５０℃で３分間予熱した後、６００℃で３分間加熱して
、ろう付けした。ろう付後にフラックスの残渣を洗い流
す作業は、総ての供試体に就いて行なわなかフた。In addition, when carrying out each brazing method, use N2 gas atmosphere as a non-corrosive atmosphere, set the dew point during brazing to -30℃, and perform brazing according to the conditions shown in Figure 2. Heat exchanger tubes 1 and fins 2 combined as shown in
After preheating at 50°C for 3 minutes, it was heated at 600°C for 3 minutes to perform brazing. The work of rinsing away flux residue after brazing was not performed on all specimens.
又、ろう付性は、ろう付後の熱交換器を目視する事で行
ない、このろう付性を表わす欄でｒ非常に良好１は、ろ
う付後に、伝熱管１とフィン２との間に形成されるろう
材のフィレットが、ろう何部の全長に亘って形良く、途
切れる事なく連続している状態を、「良好」は、フィレ
ットの形状は若干悪いが、フィレットはろう何部の全長
の９５％以上に亘って連続しており、ろう付強度には問
題がない状態を、ｒ不良１は、フィレットが不連続で、
ろう付強度にも問題がある状態を、それぞれ示している
。In addition, the brazing property is determined by visually observing the heat exchanger after brazing. "Good" means that the fillet of the brazing filler metal that is formed is in good shape and continuous without interruption over the entire length of the brazing part. "Good" means that the shape of the fillet is slightly bad, but the fillet is continuous over the entire length of the brazing part. 95% or more of the fillet is continuous and there is no problem with brazing strength.
Each shows a situation where there is a problem with brazing strength.
又、腐食試験結果の欄には、ろう付後に伝熱管１とフィ
ン２との耐食性を測定した試験の結果を、伝熱管１の表
面に生じた孔食の内の、最も深いものの深さ（単位ｌ１
ｌＩｌｌ）で記載した。腐食試験は、ＪＩＳ Ｈ８６８
１に定められたＣＡＳＳ試験法により１０００時間連続
して行なった後、伝熱管３の表面に生じた孔食の深さを
測定する事で行なった。孔食深さが０．１ｍｍ以下のも
のは、耐食性良好と判断される。ＣＡＳＳ試験法とは、
５％のＮａＣ１懸濁液を、酢酸によってＰ）１３に調整
し、更にＣｕ”イオンを、塩化第二銅の形で１００ ｐ
ｐｍ加えた腐食性液体を、５０℃の雰囲気で、１．０〜
２、０−ｍ１７８０ｃｍ’／ｈｒの割合で噴露するもの
で、試験片は、試験の間中、この腐食性液体のｎ中に曝
される。In addition, in the column of corrosion test results, the results of the test that measured the corrosion resistance of the heat exchanger tube 1 and the fins 2 after brazing are shown as the depth of the deepest pitting corrosion that occurred on the surface of the heat exchanger tube 1 ( unit l1
llll). Corrosion test is JIS H868
After continuous testing for 1000 hours using the CASS test method specified in Section 1, the depth of pitting corrosion that occurred on the surface of the heat exchanger tube 3 was measured. Those with a pitting depth of 0.1 mm or less are judged to have good corrosion resistance. What is the CASS test method?
A 5% NaCl suspension was adjusted to P)13 with acetic acid and further Cu'' ions were added in the form of cupric chloride to 100 p
A corrosive liquid containing 1.0 to 1.0 pm was added at 50°C.
The test piece is exposed to this corrosive liquid during the entire test, spraying at a rate of 2,0-m1780 cm'/hr.
更に、放熱性能は、比較例５によって造られた熱交換器
の放熱性能を１００とし、全く同じ大きさの熱交換器の
放熱性能を、これ（比較例５）の放熱性能と比較する事
で行なった。Furthermore, the heat dissipation performance is determined by setting the heat dissipation performance of the heat exchanger made in Comparative Example 5 as 100, and comparing the heat dissipation performance of a heat exchanger of exactly the same size with the heat dissipation performance of this (Comparative Example 5). I did it.
この様な試験の結果を示す第１表から明らかな通り、本
発明のろう付方法によりアルミニウム材同士をろう付す
る場合、良好なろう付を行なう事が出来、しかもフラッ
クスの残渣をそのままとしても、ろう付後に於ける耐食
性に問題がない事を確認出来た。As is clear from Table 1 showing the results of such tests, when aluminum materials are brazed together using the brazing method of the present invention, good brazing can be achieved, and even with flux residue left as is. It was confirmed that there were no problems with corrosion resistance after brazing.
次に、ポリブテン中に混合するフラックスとして、に２
ＳｉＦ、とＺｎＦ２とから成る基本組成物に、ＮａＦと
ＡｌＦ３とを加えて、第２表に示した様な組成を有する
ものを使用して、第２図に示した様なコンデンサのろう
付を行なった。コンデンサを構成する伝熱管１とフィン
２とを構成するアルミニウム材は、上述の第一番目の発
明の実施例の場合と全く同じ寸法、組成のものを使用し
た。Next, as a flux to be mixed into the polybutene,
By adding NaF and AlF3 to the basic composition consisting of SiF and ZnF2 and using a composition shown in Table 2, a capacitor as shown in Fig. 2 is brazed. I did it. The aluminum materials constituting the heat exchanger tubes 1 and fins 2 constituting the capacitor had exactly the same dimensions and composition as in the first embodiment of the invention described above.
この第２表から明らかな通り、本発明のろう付方法によ
りアルミニウム材同士をろう付する場合、良好なろう付
を行なう事が出来、しかもフラックスの残漬をそのまま
としても、ろう付後に於ける耐食性に問題がない事を確
認出来た。As is clear from Table 2, when aluminum materials are brazed together using the brazing method of the present invention, good brazing can be achieved, and even if the flux remains as is, the It was confirmed that there were no problems with corrosion resistance.
Ｃ９発明の効果
本発明のアルミニウム材のろう付方法は、以上に述べた
通り構成され実施される為、フラックスを必要な部分に
のみ塗布する事が可能となって、フラックスの使用量低
減に伴なうろう付製品の製作費低減を図れるだけでなく
、余分なフラックスの残渣によるろう付製品の品質、性
能の低下を防上出来、しかもアルミニウム材同士のろう
付強度の向上や耐食性の向上も図れて、耐久性の優れた
アルミニウム材ろう付製品を得る事が出来る。C9 Effects of the Invention Since the method for brazing aluminum materials of the present invention is configured and carried out as described above, it is possible to apply flux only to the necessary areas, which reduces the amount of flux used. Not only can you reduce the production cost of brazed products, but you can also prevent the quality and performance of brazed products from deteriorating due to excess flux residue, and you can also improve the brazing strength and corrosion resistance between aluminum materials. It is possible to obtain a brazed aluminum product with excellent durability.
第１図は温度上昇に伴なうポリブテンの重量減少の状態
を示す線図、第２図は本発明の方法によりろう付される
アルミニウム材製のコンデンサを示す正面図である。
１：伝熱管、２：フィン。
特許出願人 日本ラヂヱーター株式会社代 理
人 小 山 欽造（ばか１名）第１表FIG. 1 is a diagram showing how the weight of polybutene decreases as the temperature rises, and FIG. 2 is a front view showing a capacitor made of aluminum material to be brazed by the method of the present invention. 1: Heat exchanger tube, 2: Fin. Patent applicant: Japan Radiator Co., Ltd.
Person Kinzo Koyama (1 idiot) Table 1
Claims (2)
の二重結合を有し、構造式 ▲数式、化学式、表等があります▼ で表わされるポリブテン中に、３０〜９０％のＫ＿２Ｓ
ｉＦ＿６と７０〜１０％のＺｎＦ＿２とを混合して１０
０％として成るフラックスを均一に分散混合したものを
、対となって互いにろう付されるアルミニウム材の内の
、少なくとも一方のアルミニウム材の表面に塗布した後
、上記対となるアルミニウム材を非酸化性雰囲気中で加
熱し、対となるアルミニウム材の間に存在するろう材を
溶融させる、アルミニウム材のろう付方法。(1) A copolymer mainly composed of isobutylene, which has one double bond at the end, and has 30 to 90% K_2S in the polybutene represented by the structural formula ▲ Numerical formula, chemical formula, table, etc. ▼
10 by mixing iF_6 and 70-10% ZnF_2
After applying a uniformly dispersed mixture of 0% flux to the surface of at least one of the aluminum materials to be brazed to each other as a pair, the pair of aluminum materials is non-oxidized. A brazing method for aluminum materials that involves heating in a neutral atmosphere to melt the brazing material between the aluminum materials.
の二重結合を有し、構造式 ▲数式、化学式、表等があります▼ で表わされるポリブテン中に、基本組成物に対する割合
が３０〜９０％のＫ＿２ＳｉＦ＿６と、同じく基本組成
物に対する割合が７０〜１０％のＺｎＦ＿２とから成り
、フラックス全体に対する割合が９８〜９０％の基本組
成物と、フラックス全体に対する割合が１〜３％のＮａ
Ｆと、同じく１〜７％の肩ＡｌＦ＿３とから成るフラッ
クスを均一に分散混合したものを、対となって互いにろ
う付けされるアルミニウム材の内の、少なくとも一方の
アルミニウム材の表面に塗布した後、上記対となるアル
ミニウム材を非酸化性雰囲気中で加熱し、対となるアル
ミニウム材の間に存在するろう材を溶融させる、アルミ
ニウム材のろう付方法。(2) A copolymer mainly composed of isobutylene, which has one double bond at the end, and is represented by the structural formula ▲ Numerical formula, chemical formula, table, etc. ▼ The proportion of the basic composition is 30 The basic composition consists of ~90% K_2SiF_6 and 70-10% ZnF_2, also with a proportion of the total flux, of 98-90% of the total flux, and Na with a proportion of 1-3% of the total flux.
After applying a uniformly dispersed mixture of flux consisting of F and shoulder AlF_3 of 1 to 7% to the surface of at least one of the aluminum materials to be brazed to each other in a pair. . A method for brazing aluminum materials, which comprises heating the pair of aluminum materials in a non-oxidizing atmosphere to melt the brazing material present between the pair of aluminum materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62297720A JP2571798B2 (en) | 1987-11-27 | 1987-11-27 | Aluminum brazing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62297720A JP2571798B2 (en) | 1987-11-27 | 1987-11-27 | Aluminum brazing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01143795A true JPH01143795A (en) | 1989-06-06 |
| JP2571798B2 JP2571798B2 (en) | 1997-01-16 |
Family
ID=17850302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62297720A Expired - Fee Related JP2571798B2 (en) | 1987-11-27 | 1987-11-27 | Aluminum brazing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2571798B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5173126A (en) * | 1991-05-07 | 1992-12-22 | Kabushiki Kaisha Nihon Genma | Aluminum brazing paste |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5443853A (en) * | 1977-09-16 | 1979-04-06 | Fuyuujian Inc | Paste brazing material consisting of single structure element |
| JPS5827037A (en) * | 1981-07-30 | 1983-02-17 | ホホテンペラト−ル−レアクトルバウ・ゲゼルシヤフト・ミト・ベシユレンクタ・ハフツンク | Measuring device for tension |
| JPS5954496A (en) * | 1982-09-14 | 1984-03-29 | インタ−ナシヨナル ビジネス マシ−ンズ コ−ポレ−シヨン | Brazing method and brazing paste |
-
1987
- 1987-11-27 JP JP62297720A patent/JP2571798B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5443853A (en) * | 1977-09-16 | 1979-04-06 | Fuyuujian Inc | Paste brazing material consisting of single structure element |
| JPS5827037A (en) * | 1981-07-30 | 1983-02-17 | ホホテンペラト−ル−レアクトルバウ・ゲゼルシヤフト・ミト・ベシユレンクタ・ハフツンク | Measuring device for tension |
| JPS5954496A (en) * | 1982-09-14 | 1984-03-29 | インタ−ナシヨナル ビジネス マシ−ンズ コ−ポレ−シヨン | Brazing method and brazing paste |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5173126A (en) * | 1991-05-07 | 1992-12-22 | Kabushiki Kaisha Nihon Genma | Aluminum brazing paste |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2571798B2 (en) | 1997-01-16 |
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