JP5278348B2 - Alloy for joining - Google Patents

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JP5278348B2
JP5278348B2 JP2010037644A JP2010037644A JP5278348B2 JP 5278348 B2 JP5278348 B2 JP 5278348B2 JP 2010037644 A JP2010037644 A JP 2010037644A JP 2010037644 A JP2010037644 A JP 2010037644A JP 5278348 B2 JP5278348 B2 JP 5278348B2
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joining
atomic
alloy
bonding
foil
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JP2010284721A (en
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有一 佐藤
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Nippon Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide alloy for joining which achieves improvement of joining strength and toughness of a joining layer all together by optimizing alloy composition. <P>SOLUTION: Alloy foil for joining contains, in atom%, &ge;6% and &le;18% of B, &ge;0.1% and &le;10% of C, and the balance Fe with inevitable impurities. In addition, the alloy foil for joining contains at least one of &ge;0.1% and &le;5% of Al, &ge;0.1% and &le;20% of Cr, &ge;0.1% and &le;10% of V, and &ge;0.1% and &le;40% of Ni. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、各種部品、構造物等の材料を接合するための接合用合金に関するものである。   The present invention relates to a bonding alloy for bonding materials such as various parts and structures.

各種部品、構造物等の材料の接合方法として、液相拡散接合が知られている。液相拡散接合とは、被接合材間に融点が被接合材のそれより低い接合材料を介在させて、接合材料の液相線温度以上、被接合材料の液相線温度以下の温度で加熱し、接合材料中の拡散元素を拡散させて接合する方法である。   Liquid phase diffusion bonding is known as a method for bonding materials such as various parts and structures. In liquid phase diffusion bonding, a bonding material having a melting point lower than that of the material to be bonded is interposed between the materials to be bonded and heated at a temperature not lower than the liquidus temperature of the bonding material and not higher than the liquidus temperature of the material to be bonded. In this method, the diffusion element in the bonding material is diffused for bonding.

本発明者らは、酸化雰囲気中での液相拡散接合を実現できる接合用合金箔を発明し、開示した(特許文献1参照)。上記合金箔は、P:1.0〜20原子%、Si:1.0〜10原子%、V:0.1〜20原子%、B:1.0〜20原子%を含有し、さらに、Cr、Ni、Co、W、Nb、Tiを必要に応じて含有し、残部がFe及び不可避的不純物からなる組成を有し、厚さが3.0〜200μmの箔である。   The inventors have invented and disclosed a bonding alloy foil capable of realizing liquid phase diffusion bonding in an oxidizing atmosphere (see Patent Document 1). The alloy foil contains P: 1.0 to 20 atomic%, Si: 1.0 to 10 atomic%, V: 0.1 to 20 atomic%, B: 1.0 to 20 atomic%, A foil having a composition of Cr, Ni, Co, W, Nb, Ti as required, the balance of Fe and inevitable impurities, and a thickness of 3.0 to 200 μm.

また、このような合金箔を製造するための方法として、単ロール法や双ロール法などが知られている。これらの方法は、高速回転する金属製ドラムの外周面に、溶融金属・合金をオリフィスなどから噴出させることにより急速に凝固させて、箔を鋳造するものである。合金組成を適正に選ぶことによって、液体金属に類似した非晶質合金箔を製造することができる。   Moreover, a single roll method, a twin roll method, etc. are known as a method for manufacturing such an alloy foil. In these methods, a foil is cast by rapidly solidifying the outer peripheral surface of a metal drum rotating at high speed by ejecting molten metal / alloy from an orifice or the like. By properly selecting the alloy composition, an amorphous alloy foil similar to a liquid metal can be produced.

本発明者らは、上記特許文献1に開示した液相拡散接合用合金箔を改善した液相拡散接合用合金箔を開示した(特許文献2、3参照)。これら特許文献2、3で開示した接合用合金は、接合強度の改善を狙ったもので、その特徴は接合用合金箔のSi含有量を低減したことである。   The present inventors have disclosed an alloy foil for liquid phase diffusion bonding, which is an improvement over the alloy foil for liquid phase diffusion bonding disclosed in Patent Document 1 (see Patent Documents 2 and 3). These bonding alloys disclosed in Patent Documents 2 and 3 are aimed at improving the bonding strength, and the feature is that the Si content of the bonding alloy foil is reduced.

本発明者らが接合部強度劣化の原因を調査したところ、SiOが強度劣化をもたらす割れの基点となっており、このSiOは接合箔中のSiによるものであることが判明したことによる。 When the present inventors investigated the cause of joint strength deterioration, SiO 2 was the base point of cracking that caused strength deterioration, and it was found that this SiO 2 was due to Si in the joining foil. .

さらに、本発明者らは、上記特許文献2、3で開示した接合用合金での接合後の接合部靭性を改善するための接合合金箔を提案した(特許文献4参照)。特許文献4で開示した接合用合金箔は、接合部の靭性の改善を狙ったもので、その特徴は、接合用合金箔のP含有量を低減したことである。本発明者らが接合部靭性劣化の原因を調査したところ、含有するPによるものであることが判明したためである。   Furthermore, the present inventors have proposed a bonded alloy foil for improving the joint toughness after bonding with the bonding alloys disclosed in Patent Documents 2 and 3 (see Patent Document 4). The alloy foil for joining disclosed in Patent Document 4 aims to improve the toughness of the joint, and its feature is that the P content of the alloy foil for joining is reduced. This is because the inventors have investigated the cause of joint toughness deterioration and found that it is due to the contained P.

しかしながら、液相拡散接合が適用可能な多くの用途の中には、接合部の強度と靭性の更なる改善が必要な用途があり、そのような用途で液相拡散接合の適用を実現するには、使用する接合用合金箔の更なる改善が求められていた。   However, among many applications where liquid phase diffusion bonding can be applied, there are applications that require further improvements in joint strength and toughness. There has been a demand for further improvement of the bonding alloy foil used.

特開平9−323175号公報JP-A-9-323175 特開2004−001065号公報JP 2004-001065 A 特開2004−114157号公報JP 2004-114157 A 特開2005−279748号公報JP 2005-279748 A

本発明は、接合後の接合部の接合強度と靱性を一層改善できる液相拡散接合用の合金を提供することを課題とする。   An object of the present invention is to provide an alloy for liquid phase diffusion bonding that can further improve the bonding strength and toughness of the bonded portion after bonding.

本発明では、接合用合金の合金組成を最適化することで上記の課題を解決した。すなわち、本発明は、Si、Pを添加しなくても、その他の添加元素の種類と量を工夫することで液相拡散接合用合金として使用可能な合金が得られることを見出したにことに基づきなされたものである。本発明の液相拡散接合用合金は、Si、Pを含有しないことにより、接合後の接合強度と靭性の一層の向上を実現したものである。   In the present invention, the above problem has been solved by optimizing the alloy composition of the joining alloy. That is, the present invention has found that an alloy that can be used as a liquid phase diffusion bonding alloy can be obtained by devising the type and amount of other additive elements without adding Si and P. It was made based on. The liquid phase diffusion bonding alloy of the present invention does not contain Si or P, thereby realizing further improvement in bonding strength and toughness after bonding.

本発明の要旨は、以下のとおりである。   The gist of the present invention is as follows.

(1)原子%で、
B :6%以上18%以下、
C :0.1%以上10%以下
を含有し、残部がFe及び不可避的不純物からなることを特徴とする接合用の合金。
(1) Atomic%
B: 6% or more and 18% or less,
C: An alloy for joining, containing 0.1% or more and 10% or less, with the balance being Fe and inevitable impurities.

(2)さらに原子%で、
Al:0.1%以上5%以下
を含有することを特徴とする前記(1)に記載の接合用の合金。
(2) Furthermore, in atomic%,
Al: 0.1% or more and 5% or less is contained, The alloy for joining as described in said (1) characterized by the above-mentioned.

(3)さらに原子%で、
Cr:0.1%以上20%以下
を含有することを特徴とする前記(1)又は(2)に記載の接合用の合金。
(3) Furthermore, in atomic%,
Cr: Alloy for bonding according to (1) or (2) above, containing 0.1% or more and 20% or less.

(4)さらに原子%で、
V:0.1%以上10%以下
を含有することを特徴とする前記(1)〜(3)のいずれかに記載の接合用の合金。
(4) Furthermore, in atomic%,
V: The alloy for bonding according to any one of (1) to (3) above, containing 0.1% to 10%.

(5)さらに原子%で、
Ni:0.1%以上11.1%以下
を含有することを特徴とする前記(1)〜(4)のいずれかに記載の接合用の合金。
(5) Furthermore, in atomic%,
Ni: The alloy for bonding according to any one of (1) to (4) above, containing 0.1% to 11.1 %.

本発明の接合用合金によれば、液相拡散接合における接合部の接合強度と靭性を、従来の接合用合金を使用した場合と比較して、例えば、シャルピー衝撃試験での吸収エネルギー値で2倍程度まで良好な値を示すほど向上させることが可能となる。その結果、液相拡散接合の適用分野拡大が実現できることになる。   According to the bonding alloy of the present invention, the bonding strength and toughness of the bonded portion in the liquid phase diffusion bonding are, for example, 2 in the absorbed energy value in the Charpy impact test, compared with the case where the conventional bonding alloy is used. It becomes possible to improve as a good value is shown up to about twice. As a result, application field expansion of liquid phase diffusion bonding can be realized.

実施例における、接合実験を示す図である。It is a figure which shows the joining experiment in an Example. 実施例における、引張試験片を示す図である。It is a figure which shows the tensile test piece in an Example.

本発明の接合用合金は、箔形成に重要である非晶質形成能の向上をSiやPを用いることなく実現できる成分系を見出したことに起因するものであり、さらに、接合箔として具備すべき低融点化をも同時に可能とする。箔形成にあたり、非晶質相は箔全体に形成されなくてもよい。しかし、非晶質相の形成される割合が小さすぎると箔の形成が困難になるので、非晶質相の形成される割合は、箔全体の50%以上であることが好ましく、さらに好ましくは70%以上である。   The joining alloy of the present invention is due to the discovery of a component system that can realize the improvement of the amorphous forming ability, which is important for foil formation, without using Si or P, and further comprises as a joining foil. At the same time, it is possible to lower the melting point. In forming the foil, the amorphous phase may not be formed on the entire foil. However, since the formation of the foil becomes difficult if the proportion of the amorphous phase formed is too small, the proportion of the amorphous phase formed is preferably 50% or more of the entire foil, more preferably 70% or more.

接合部の靱性劣化は、接合層の粒界にPが濃縮していることによるものであり、Pの粒界偏析が原因である。本発明の接合用合金は、Pを用いないことでこの靭性の発現を抑制した。さらに、Siを含有しないことで、接合部強度劣化の原因となるSiOの生成を抑制した。 The toughness deterioration of the joint is due to the concentration of P at the grain boundary of the joint layer, and is caused by the P grain boundary segregation. The joining alloy of the present invention suppressed the development of this toughness by not using P. Furthermore, by not containing Si, and suppress the formation of SiO 2 which causes the joint strength deteriorates.

以下に成分限定理由を述べる。   The reasons for limiting the components will be described below.

Bは、6原子%未満では非晶質形成が困難となるため、6原子%以上とし、好ましくは 8原子%以上である。一方、18原子%超では接合部に硼化物を生成し接合強度を低下させるため、18原子%以下とし、好ましくは16原子%以下である。   If B is less than 6 atomic%, it is difficult to form an amorphous state. Therefore, B is 6 atomic% or more, and preferably 8 atomic% or more. On the other hand, if it exceeds 18 atomic%, a boride is generated at the joint and the bonding strength is lowered, so that it is 18 atomic% or less, preferably 16 atomic% or less.

Cも非晶質形成能の向上に重要で、低融点化にも有効な元素である。0.1原子%未満ではそれらの効果は認められず、10原子%超の過度の添加は接合層の特性劣化を招く。よって、Cの含有量を0.1原子%以上10原子%以下とした。なお、Cの含有量は多い方がその効果を発現しやすく、1原子%以上とするのがより好ましい。   C is also important for improving the amorphous forming ability and is an element effective for lowering the melting point. If it is less than 0.1 atomic%, those effects are not recognized, and excessive addition exceeding 10 atomic% causes deterioration of the properties of the bonding layer. Therefore, the C content is set to 0.1 atomic percent or more and 10 atomic percent or less. In addition, the one where there is much content of C tends to express the effect, and it is more preferable to set it as 1 atomic% or more.

Alも非晶質形成能に役立つ元素である。0.1原子%未満ではその効果は認められず、5原子%超となるともはやその効果は失われる。よって、Alの含有量を0.1原子%以上5原子%以下とし、好ましくは0.5原子%以上である。   Al is also an element useful for amorphous forming ability. If it is less than 0.1 atomic%, the effect is not recognized, and if it exceeds 5 atomic%, the effect is lost. Therefore, the Al content is 0.1 atomic% or more and 5 atomic% or less, and preferably 0.5 atomic% or more.

なお、母材への熱影響を考慮すると融点は低いほど良く、接合用合金の融点は1200℃以下、さらには1100℃以下が好ましい。   In consideration of the thermal influence on the base material, the lower the melting point, the better. The melting point of the bonding alloy is preferably 1200 ° C. or lower, more preferably 1100 ° C. or lower.

Crは、耐食性、耐酸化性を高めるために、必要に応じて添加する。0.1原子%未満ではその効果が不十分であり、20原子%を超えると融点が高くなり好ましくない。したがって、Cr含有量を0.1原子%以上20原子%以下とし、好ましくは1原子%以上18原子%以下である。   Cr is added as necessary to enhance corrosion resistance and oxidation resistance. If it is less than 0.1 atomic%, the effect is insufficient, and if it exceeds 20 atomic%, the melting point becomes high, which is not preferable. Therefore, the Cr content is 0.1 atomic% or more and 20 atomic% or less, preferably 1 atomic% or more and 18 atomic% or less.

Vは、被接合材表面の酸化被膜形成物質を低融点物質にする効果がある。例えば、Feを融点が約800℃の低融点複合酸化物V−Feにする効果があり、通常の接合温度では酸化被膜が溶融する。このような酸化物は、溶けると表面張力の差によって球状化するので隙間が生成し、B、C等の拡散元素が自由に拡散できるようになり、酸化雰囲気中でも液相拡散接合を達成できる。 V has the effect of making the oxide film forming substance on the surface of the material to be joined a low melting point substance. For example, has the effect of the Fe 2 O 3 having a low melting point composite oxides having a melting point of about 800 ℃ V 2 O 5 -Fe 2 O 3, in a normal bonding temperature oxidation film is melted. When such an oxide is melted, it is spheroidized due to the difference in surface tension, so that a gap is formed and diffusion elements such as B and C can freely diffuse, and liquid phase diffusion bonding can be achieved even in an oxidizing atmosphere.

V含有量が0.1原子%未満ではこの効果が不十分であり、10原子%超では融点が高くなるので好ましくない。よって、V含有量を0.1原子%以上10原子%以下とし、好ましくは0.5原子%以上8原子%以下である。   If the V content is less than 0.1 atomic%, this effect is insufficient, and if it exceeds 10 atomic%, the melting point becomes high. Therefore, the V content is 0.1 atomic% or more and 10 atomic% or less, preferably 0.5 atomic% or more and 8 atomic% or less.

Niは、低融点化効果があり、さらに箔の形成能を向上させる。Ni含有量が0.1原子%未満ではこの効果が不十分であり、40原子%超ではこの効果が得られなくなるばかりでなく、原料コストが嵩むことになるので好ましくない。よって、Ni含有量を0.1原子%以上40原子%以下とする必要があるが、実施例33のNi含有量に基いて、上限を11.1%とした。なお、Niの含有量は多い方がその効果を発現しやすく、5原子%以上が好ましい。
Ni has an effect of lowering the melting point, and further improves the foil forming ability. If the Ni content is less than 0.1 atomic%, this effect is insufficient, and if it exceeds 40 atomic%, this effect cannot be obtained, and the raw material cost increases. Therefore, the Ni content needs to be 0.1 atomic% or more and 40 atomic% or less, but based on the Ni content of Example 33, the upper limit was made 11.1% . In addition, the one where content of Ni is large tends to express the effect, and 5 atomic% or more is preferable.

上記元素以外の残部は、Fe及び不可避的不純物からなる。不可避的不純物としては、Mn、S等を0.2原子%程度まで含有しても特段の問題はない。Si、Pについても、それぞれ0.005原子%以下の分析限界程度以下の含有量(通常の不可避的不純物量)であれば、特段問題とはならない。   The balance other than the above elements consists of Fe and inevitable impurities. As an inevitable impurity, there is no particular problem even if Mn, S, etc. are contained up to about 0.2 atomic%. Si and P are not particularly problematic as long as the content is less than the limit of analysis of 0.005 atomic% or less (normal unavoidable impurity amount).

もちろん、接合後の靭性改善の観点から、Pの含有量は極力少ない方が良いが、実際には合金を溶製する際に用いる鉄源やその他の合金類から不可避的不純物として含まれるのは避けられない。しかし、上記の分析限界程度に抑えれば問題なく、特段純度の良い鉄源や合金類を用いて製造コストを嵩張らせなくても、この分析限界程度内に抑えることは可能である。因みに、例えば0.01%程度の極少量のPでも靭性劣化が発現するのは、接合後の結晶粒界での偏析によるPの濃化に起因する。   Of course, from the viewpoint of improving toughness after joining, the P content should be as low as possible, but in practice it is included as an inevitable impurity from the iron source and other alloys used when melting the alloy. Unavoidable. However, there is no problem as long as it is limited to the above-mentioned analysis limit, and it is possible to suppress it within this analysis limit without increasing the manufacturing cost by using an iron source or alloys with particularly good purity. Incidentally, the deterioration of toughness even with a very small amount of P of about 0.01%, for example, is due to the concentration of P due to segregation at the grain boundary after bonding.

なお、Vを添加することにより酸化雰囲気中での接合が可能となるが、本発明のV添加合金は、酸化雰囲気での使用に特に限定されるものではない。   In addition, joining in an oxidizing atmosphere is possible by adding V, but the V-added alloy of the present invention is not particularly limited to use in an oxidizing atmosphere.

本発明の接合用合金は、液相拡散接合のみならず、いわゆるロウ付け及びロウ接とよばれる接合法にも使用できる。この接合法は一般的に、接合材が溶融したのち、接合材中の拡散元素が被接合材中に拡散する前に固化して接合する方法である。   The bonding alloy of the present invention can be used not only for liquid phase diffusion bonding but also for bonding methods called so-called brazing and brazing. In general, this bonding method is a method in which, after the bonding material is melted, the diffusion element in the bonding material is solidified and diffused before being diffused into the material to be bonded.

また、本発明の接合用合金は、急冷凝固法として知られている単ロール法や双ロール法等により箔に鋳造し、箔状の接合材として使用することができる。また、形状として箔のほか、用途に応じて粉末等でも使用することができる。さらに、非晶質に限らず、結晶質のものでも用途によっては使用可能である。   Further, the joining alloy of the present invention can be cast into a foil by a single roll method or a twin roll method known as a rapid solidification method and used as a foil-like joining material. In addition to foil as a shape, powder can be used depending on the application. Further, not only amorphous but also crystalline ones can be used depending on applications.

本発明を実施例に基づいて、以下に詳細に説明する。表1、2に示す各合金について、単ロール法により下記条件で箔を鋳造した。なお、表1、2において、“−”は、含有量が検出限界未満であることを意味する。表3、4に融点及び接合実験の結果を示す。   The present invention will be described in detail below based on examples. About each alloy shown to Table 1, 2, foil was cast on the following conditions by the single roll method. In Tables 1 and 2, “-” means that the content is less than the detection limit. Tables 3 and 4 show the melting point and the result of the joining experiment.

冷却ロール:材質;Cu−1質量%Cr
直径;300mm
幅;50mm
表面速度(周速):25m/s
ノズル−冷却ロール間のギャップ:250μm
ノズル開口形状:0.6mm×25mm
Cooling roll: Material; Cu-1 mass% Cr
Diameter: 300mm
Width: 50mm
Surface speed (peripheral speed): 25 m / s
Nozzle-cooling roll gap: 250 μm
Nozzle opening shape: 0.6mm x 25mm

各合金は、いずれも、Mn、S等の不純物を0.2原子%程度含んでいる。Si、PはICP分析法で分析した結果、分析限界以下(0.005原子%以下)であった。鋳造時の溶融合金温度は、表3、4に示す融点よりおよそ150℃高い温度とした。各合金の融点はDTA装置により求め、表3、4に示した。   Each alloy contains about 0.2 atomic% of impurities such as Mn and S. As a result of analysis by ICP analysis, Si and P were below the analysis limit (0.005 atomic% or less). The temperature of the molten alloy at the time of casting was about 150 ° C. higher than the melting points shown in Tables 3 and 4. The melting point of each alloy was determined by a DTA apparatus and shown in Tables 3 and 4.

鋳造の結果、比較例のNo.38、No.39、No.43、No.49、No.54、No.56、No.57及びNo.59は良好な箔が得られず、以後の接合実験を行うことができなかった。これは、非晶質形成能が低かったことによるものである。   As a result of casting, the comparative example No. 38, no. 39, no. 43, no. 49, no. 54, no. 56, no. 57 and no. No good foil was obtained for 59, and subsequent joining experiments could not be performed. This is because the amorphous forming ability was low.

表3、4の融点、接合雰囲気、接合強度における“−”は、試験未実施であることを意味する。それ以外は、本発明例、比較例とも問題なく鋳造でき、板厚が30μm程度の良好な箔が得られた。   In Tables 3 and 4, “−” in the melting point, the bonding atmosphere, and the bonding strength means that the test has not been performed. Otherwise, the present invention example and the comparative example could be cast without any problem, and a good foil having a thickness of about 30 μm was obtained.

そして、得られた箔を用いて接合実験を行った。接合実験に際しては、直径20mmの円盤状にした箔を2枚重ねて接合材とし、直径20mmのSTK490丸鋼(融点1550℃以上)を被接合材とした。   And the joining experiment was done using the obtained foil. In the joining experiment, two pieces of foil having a disk shape with a diameter of 20 mm were overlapped to form a joining material, and STK490 round steel having a diameter of 20 mm (melting point of 1550 ° C. or higher) was used as the joining material.

図1に示すように、2本の被接合材1の間に接合材2を挟み込んで接合した。接合温度
は、各接合材2の融点直上から融点+50℃として、雰囲気制御が可能な加熱炉を用いて、表3、4に示すそれぞれの雰囲気で加熱した。加熱中は、被接合材1と接合材2の密着性を高めるため2MPaで加圧した。接合時間はすべて10分とした。
As shown in FIG. 1, a bonding material 2 is sandwiched between two bonded materials 1 and bonded. The bonding temperature was set to a melting point + 50 ° C. immediately above the melting point of each bonding material 2 and heated in respective atmospheres shown in Tables 3 and 4 using a heating furnace capable of controlling the atmosphere. During heating, a pressure of 2 MPa was applied in order to improve the adhesion between the material to be bonded 1 and the bonding material 2. The joining time was all 10 minutes.

接合実験後、接合継手部の引張強度を評価するために引張試験を行った。引張試験に際しては図2に示すように、被接合材1を接合した丸棒3から接合線4を中心としてJIS2号引張試験片5を切り出し、JISA2号引張試験機を用いて引張試験を行った。また、接合実験前の被接合材の母材からも同試験片を切り出して同様に引張試験を行い、接合強度を対母材比(接合部強度/母材強度)で表3、4に示した。   After the joining experiment, a tensile test was performed to evaluate the tensile strength of the joint joint. In the tensile test, as shown in FIG. 2, a JIS No. 2 tensile test piece 5 was cut out from the round bar 3 to which the material to be joined 1 was joined, with the joining line 4 as the center, and a tensile test was conducted using a JIS No. 2 tensile tester. . In addition, the same test piece was cut out from the base material of the material to be joined before the joining experiment and the tensile test was performed in the same manner, and the joint strength is shown in Tables 3 and 4 in terms of base material ratio (joint strength / base material strength). It was.

さらに、接合後の靱性を評価するために、シャルピー衝撃試験により、継手部の吸収エネルギーの測定を行った。衝撃試験に際しては、引張試験と同様に継手部からJISZ2201号記載の4号衝撃試験片を切り出し、JISZ2201号記載の要領で行った。衝撃試験の温度は0℃とし、得られた結果は表3、4に示した。   Furthermore, in order to evaluate the toughness after joining, the absorbed energy of the joint part was measured by the Charpy impact test. In the impact test, a No. 4 impact test piece described in JISZ2201 was cut out from the joint part in the same manner as described in JISZ2201, as in the tensile test. The temperature of the impact test was 0 ° C., and the results obtained are shown in Tables 3 and 4.

表3、4に示したように、本発明例はいずれも、対母材比で1.0を超える高い引張強度を示し、同時に吸収エネルギーが150Jを超える優れた靱性が得られた。高い靱性を示したのは、Pを含有させなかったことにより脆化を抑制できたためと考えられる。   As shown in Tables 3 and 4, all of the inventive examples exhibited high tensile strength exceeding 1.0 in terms of base material ratio, and at the same time, excellent toughness having an absorbed energy exceeding 150 J was obtained. The high toughness is considered to be because embrittlement could be suppressed by not containing P.

これに対して、表3、表4に示したように、比較例では衝撃試験での吸収エネルギーで150Jを超えるものがあったが、引張強度の対母材比が1.0超となるものはなく、接合強度と靭性の両者を満足するものはなかった。   On the other hand, as shown in Tables 3 and 4, in the comparative examples, there were those in which the absorbed energy in the impact test exceeded 150 J, but the tensile strength to base material ratio exceeded 1.0. None, and none of them satisfied both joint strength and toughness.

Figure 0005278348
Figure 0005278348

Figure 0005278348
Figure 0005278348

Figure 0005278348
Figure 0005278348

Figure 0005278348
Figure 0005278348

複雑な接合形状を有する各種部品や構造物等の材料の接合において、液相拡散接合は接合温度の低下や、一度に広い接合も可能とすることから、コスト・時間の削減の観点から産業上有益な接合方法である。本発明の接合用合金箔を用いることにより、この液相拡散接合の適用先拡大すなわち、接合コストの低減を広い範囲で可能とすることが実現できる。   In the joining of materials such as various parts and structures with complicated joining shapes, liquid phase diffusion joining enables the joining temperature to be lowered and wide joining at a time. It is a useful joining method. By using the bonding alloy foil of the present invention, it is possible to realize the wide application of the liquid phase diffusion bonding, that is, the reduction of the bonding cost.

1 被接合材
2 接合材
3 接合後の丸鋼
4 接合線
5 引張試験片
DESCRIPTION OF SYMBOLS 1 To-be-joined material 2 Joining material 3 Round steel after joining 4 Joining wire 5 Tensile test piece

Claims (5)

原子%で、
B :6%以上18%以下、
C :0.1%以上10%以下
を含有し、残部がFe及び不可避的不純物からなることを特徴とする接合用の合金。
Atomic%
B: 6% or more and 18% or less,
C: An alloy for joining, containing 0.1% or more and 10% or less, with the balance being Fe and inevitable impurities.
さらに原子%で、
Al:0.1%以上5%以下
を含有することを特徴とする請求項1項に記載の接合用の合金。
Furthermore, in atomic%,
The alloy for bonding according to claim 1, comprising Al: 0.1% to 5%.
さらに原子%で、
Cr:0.1%以上20%以下
を含有することを特徴とする請求項1又は2に記載の接合用の合金。
Furthermore, in atomic%,
The alloy for bonding according to claim 1 or 2, characterized by containing Cr: 0.1% or more and 20% or less.
さらに原子%で、
V :0.1%以上10%以下
を含有することを特徴とする請求項1〜3のいずれか1項に記載の接合用の合金。
Furthermore, in atomic%,
V: 0.1% or more and 10% or less is contained, The alloy for joining of any one of Claims 1-3 characterized by the above-mentioned.
さらに原子%で、
Ni:0.1%以上11.1%以下
を含有することを特徴とする請求項1〜4のいずれか1項に記載の接合用の合金。
Furthermore, in atomic%,
Ni: 0.1% or more and 11.1 % or less are contained, The alloy for joining of any one of Claims 1-4 characterized by the above-mentioned.
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