JPH03110061A - Brazing method for high-temperature heat-resistant brazing material - Google Patents
Brazing method for high-temperature heat-resistant brazing materialInfo
- Publication number
- JPH03110061A JPH03110061A JP24580589A JP24580589A JPH03110061A JP H03110061 A JPH03110061 A JP H03110061A JP 24580589 A JP24580589 A JP 24580589A JP 24580589 A JP24580589 A JP 24580589A JP H03110061 A JPH03110061 A JP H03110061A
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- resistant
- powder
- filler metal
- temperature heat
- 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 118
- 239000000463 material Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims description 10
- 239000000843 powder Substances 0.000 claims abstract description 27
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 7
- 239000010935 stainless steel Substances 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims description 41
- 229910052751 metal Inorganic materials 0.000 claims description 41
- 239000000945 filler Substances 0.000 claims description 33
- 239000000470 constituent Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 4
- 229910000679 solder Inorganic materials 0.000 description 8
- 238000005204 segregation Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003779 heat-resistant material Substances 0.000 description 2
- 229910006091 NiCrSi Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Landscapes
- Ceramic Products (AREA)
Abstract
Description
この発明は、高温熱交換器のパイプと筐体との接続や、
燃焼器の高温部の部材間の接続などのような、強度と気
密性とを要求される高温部の接続に適用される高温耐熱
ろうのろう付方法に関するものである。This invention can be used to connect pipes and casings of high-temperature heat exchangers,
The present invention relates to a method of brazing high-temperature heat-resistant solder that is applied to connections between high-temperature parts that require strength and airtightness, such as connections between members of high-temperature parts of combustors.
第２図は従来の一般的な高温耐熱ろうのろう付部を示す
断面図であり、スターリング機関の高温熱交換器部を例
示している０図において１はステンレス鋼などの耐熱材
からなるパイプ、２は同じくステンレス鋼などの耐熱材
からなるシリンダに穴があいた被ろう材部、３はＮｉ−
Ｃｒ−Ｂを成分とするｌｌｉろうで、被ろう材部２とパ
イプ１の嵌合間隙は１０〜２０μｍに設定されている。
またろう付の一般的な従来技術は、特開昭５４−７４２
４９号公報および特開昭５６−４３７２号公報にも記載
されている。
この高温ろう付の動作について述べる。第３図はろう付
の挙動を模擬的に示したろう材部の断面図である。Ｎｉ
−Ｃｒ−ＢからなるＮｉろうは共晶材で、ある温度、た
とえば１０７０″Ｃで融解する（第３図（ａ）参照）。
Ｎｉろうは拡散型のろう材で、ろう付温度１０７０℃で
融解し、母材であるバイブ１と被ろう材部２にＢが拡散
して拡散相４を形成し、Ｂが拡散することによってろう
材の組成が変化し、ろう材単体の融点が上昇する。その
ため、同じ１０７０°ＣでＮｉろうは等温凝固する（第
３図（ｂ）参照）。
ろう付間隙が１１００ａと広い場合は、第４図（ａ）に
模擬的に示したように２０７０″Ｃでまずろう材３が溶
融し、ついでパイプ１と被ろう件部２０周りのろう材は
Ｂの拡散にもとづく等温凝固により固まる（第４図（ａ
）参照）。ろう層の中心部に残されたろう材は、Ｂの拡
散が等温凝固したろう層３ａのために妨げられ、１０７
０″Ｃにおいて融解した状態のままになる。そのため、
ろう付間隙が広いと、解は残ったろう材を表面張力で保
持することができず、中心部のろう材は、重力により流
れ（３ｂ）、バイブｌを詰めてしまう。
また、流れすぎることがなくとも、中心部のろう材が解
は残ったままになるため、Ｂ −Ｃｒの有害な偏析物５
やボイド６を生成し、ろう材部の疲労強度を低下させる
（第４図（Ｃ）参照）。Figure 2 is a cross-sectional view showing a conventional general high-temperature heat-resistant brazing part. , 2 is a brazing filler metal part made of a heat-resistant material such as stainless steel with a hole, and 3 is a Ni-
The fitting gap between the covering brazing material portion 2 and the pipe 1 is set to 10 to 20 μm using LLI brazing material containing Cr-B as a component. In addition, the general prior art of brazing is
It is also described in Japanese Patent Application Laid-Open No. 49-49 and Japanese Patent Application Laid-Open No. 56-4372. The operation of this high-temperature brazing will be described below. FIG. 3 is a cross-sectional view of a brazing material portion simulating brazing behavior. Ni
Ni brazing material consisting of -Cr-B is a eutectic material and melts at a certain temperature, for example, 1070"C (see Figure 3 (a)). Ni brazing material is a diffusion type brazing material, and at a brazing temperature of 1070"C. B melts and diffuses into the base metal vibrator 1 and covering brazing filler metal part 2 to form a diffused phase 4. Due to the diffusion of B, the composition of the brazing filler metal changes and the melting point of the brazing filler metal itself increases. Therefore, the Ni solder solidifies isothermally at the same temperature of 1070°C (see Figure 3 (b)). If the brazing gap is as wide as 1100°C, it will be 2070" as shown in the simulation in Figure 4(a). At C, the brazing filler metal 3 is first melted, and then the brazing filler metal around the pipe 1 and the solder fitting 20 is solidified by isothermal solidification based on the diffusion of B (see Fig. 4 (a).
)reference). The brazing material left in the center of the brazing layer has 107
It remains in a molten state at 0″C. Therefore,
If the brazing gap is wide, the remaining brazing material cannot be held by surface tension, and the brazing material in the center will flow due to gravity (3b) and pack the vibrator l. In addition, even if the flow does not flow too much, the brazing filler metal in the center remains unsolved, resulting in the harmful segregation of B-Cr.
and voids 6, reducing the fatigue strength of the brazing filler metal portion (see FIG. 4(C)).
従来の高温耐熱ろうのろう付方法は以上のようにして行
われているので、ろう付間隙が大きな時、ろう材の流れ
すぎや、それにともなってろう層中にボイドが発生し、
また中心部のろう材が解は残ったままになるため、Ｂ
−Ｃｒの有害な偏析物を生成し、ろう材部の疲労強度を
低下させる。そのため、適切なろう付間隙（１０〜２０
μｍ）を確保するため、被ろう材部をリーマ仕上げなど
を行わねばならず、加工時間が多くかかるなどの課題が
あった。
この発明は上記のような課題を解消するためになされた
もので、ろう材の流れすぎやボイド及びＢ−Ｃｒの偏析
物などをともなわず、大きなろう付間隙でろう付できる
高温耐熱ろうのろう付方法を提供することを目的とする
。Conventional brazing methods for high-temperature heat-resistant brazing are performed as described above, so when the brazing gap is large, the brazing material may flow too much and voids may occur in the brazing layer as a result.
Also, since the solder metal in the center remains unsolved, B
-Generates harmful segregation of Cr and reduces the fatigue strength of the brazing filler metal. Therefore, an appropriate brazing gap (10 to 20
μm), the covered brazing material must be reamed and finished, resulting in problems such as a long processing time. This invention was made to solve the above-mentioned problems, and it is a high-temperature resistant brazing method that allows brazing with a large brazing gap without excessive flow of the filler metal, voids, or segregation of B-Cr. The purpose is to provide a method.
この発明に係わる高温耐熱ろうのろう付方法は、Ｎｉろ
う材中に金属粉末または無機質粉末を混合したろう材を
使用し、ろう付を行うものである。The high-temperature heat-resistant brazing method according to the present invention uses a Ni brazing material mixed with metal powder or inorganic powder to perform brazing.
この発明における高温耐熱ろうのろう付方法は、ろう付
間隙が大きくなっても、ろう付強度の低下をともなわず
、ろう層中に欠陥を発生させず、作業時間もほとんど変
わらず、嵌合間隙が大きくなったので、リーマ穴からキ
リ穴に変換できるので、ろう材部加工時間を削減でき、
ろう付できる。The high-temperature heat-resistant brazing method of this invention does not cause a decrease in brazing strength even when the brazing gap becomes large, does not cause defects in the brazing layer, and has almost no change in working time. Since the hole has become larger, it is possible to convert from a reamed hole to a drilled hole, which reduces machining time for the filler metal part.
Can be brazed.
以下、この発明の一実施例を図について説明する。第１
図において１はステンレス鋼などからなるパイプ、２は
同じくステンレス鋼などの耐熱材からなり、キリなどで
穴が加工された被ろう材部、１０はＮｉ−Ｃｒ−Ｂを成
分とするＮｉろうに粒径が２０〜４０μｍ程度のＮｉ粉
末１１をＮｉろうの重量を基準として５％混合したろう
材を示す。被ろう材部２とパイプ１との嵌合間隙は１０
０μｍ程度おいている０本例では、Ｎｔ絹粉末５％混入
した場合について記述するが、実験で確認されている範
囲では、１から５０％程度の割合なら著しい強度の差が
ない、粉末の割合が高くなるほど、気密性の信幀性が低
下する傾向がある。
次に動作について説明する。ろう付間隙が１００μｍと
広い場合、ろう付温度が１０７０″Ｃになると、ろう材
１０が融解する。この時、ろう材中のＮｉ粉末１１は反
応せず、金属粉の状態である（第１図（ａ））、次に、
１０７０ ’Ｃの状態に保持されると、第５図と同様に
バイブｌと被ろう材部２の周りのろう材ｌＯは、Ｂが母
材側に拡散することにより、ろう材中のＢ濃度が低下し
、等温凝固により固まる、ろう層中心部のろう材は、Ｂ
がＮｉ粉末中に拡散して等温凝固する。そのため、ろう
材１０中のＮｉ粉末１１は反応してろう材中に固溶する
（第１図（ｂ））。このようにしてろう付温度から冷却
すると、ろう付間隙が広くとも、ろう層中心部のろう材
１０が均等に凝固し、流れすぎや、Ｂ−Ｃｒの有害な偏
析物が生成されないので、ろう付強さを低下させること
なく、良好なろう付を行うことができる。 Ｎｉ粒子お
よびステンレス鋼粒子を種々の割合で添加してろう材に
よる継手の引張試験を行った結果を第５図に示す。この
ように継手強さは、５０％以下の重量比ではほとんど影
響がない。また、金属粉末の割合がそれよりも高くなる
と気密性の信鯨性が低下する傾向が認められた。
なお、上記の実施例では、ろう材に混入する金れ、ろう
付温度で溶融しなくＢとの濃度差がある金属粉末であれ
ば同様に使用できる。また、ろう付間隙も１００μｍに
固定するものでなく、金属粉末の粒径より大きく、表面
張力でろう材をろう付部に保持できる間隙であればよい
。さらに、Ｎｉ粉末の重量比を、本実施例では５％以下
としたが、５％以上でも気密性の不良率は高くなるがろ
う付できる。Ｎｉ粉末の重量比が１〜３％の時が、いち
ばんろう付不良の低下する領域である。
本実施例では、Ｎｉ−Ｃｒ−ＢのＮｉろう付について説
明したが、Ｎｉ Ｃｒ Ｓｉ系のろう材や、この他
にも拡散が起こり易い他のろう材であってもよい。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a pipe made of stainless steel, etc., 2 is also made of a heat-resistant material such as stainless steel, and the covered brazing filler metal part has a hole drilled with a drill, etc., and 10 is a Ni brazing filler metal whose ingredients are Ni-Cr-B. A brazing filler metal is shown in which Ni powder 11 having a particle size of about 20 to 40 μm is mixed in an amount of 5% based on the weight of Ni solder. The fitting gap between the covered brazing material part 2 and the pipe 1 is 10
In this example, we will describe the case where 5% of Nt silk powder is mixed, but within the range confirmed by experiments, there is no significant difference in strength between 1 and 50% of the powder ratio. The higher the value, the less reliable the airtightness tends to be. Next, the operation will be explained. When the brazing gap is as wide as 100 μm, the brazing material 10 melts when the brazing temperature reaches 1070"C. At this time, the Ni powder 11 in the brazing material does not react and remains in the state of metal powder (first Figure (a)), then
When maintained at a temperature of 1070'C, the brazing filler metal lO around the vibrator l and the covering brazing filler metal part 2 will decrease the B concentration in the brazing filler metal as B diffuses to the base metal side, as shown in FIG. The brazing material in the center of the brazing layer, where the
diffuses into the Ni powder and solidifies isothermally. Therefore, the Ni powder 11 in the brazing filler metal 10 reacts and becomes a solid solution in the brazing filler metal (FIG. 1(b)). When cooled from the brazing temperature in this way, even if the brazing gap is wide, the brazing filler metal 10 in the center of the brazing layer will solidify evenly, and excessive flow and harmful segregation of B-Cr will not be generated, so the brazing Good brazing can be achieved without reducing strength. FIG. 5 shows the results of a tensile test of a joint using a brazing filler metal with Ni particles and stainless steel particles added in various proportions. In this way, joint strength is hardly affected by a weight ratio of 50% or less. Furthermore, when the proportion of metal powder was higher than that, it was observed that the reliability of airtightness tended to decrease. In the above embodiments, any metal powder mixed in the brazing material that does not melt at the brazing temperature and has a concentration difference with B can be used in the same manner. Further, the brazing gap is not fixed at 100 μm, but may be any gap that is larger than the particle size of the metal powder and can hold the brazing material in the brazed portion by surface tension. Furthermore, although the weight ratio of Ni powder was set to 5% or less in this embodiment, brazing can be performed even if the weight ratio is 5% or more, although the rate of defective airtightness increases. When the weight ratio of Ni powder is 1 to 3%, this is the region where the brazing defects are most reduced. In this embodiment, Ni-Cr-B Ni brazing has been described, but NiCrSi-based brazing filler metal or other brazing filler metals that are likely to diffuse may also be used.
以上のようにこの発明によれば、Ｎｉろう材中に金属ま
たは無機質粉末を混合したろう材を使用してろう付を行
うことにより、ろう付間隙が大きくても、ろう付強度の
低下をともなわず、ろう層中に有害な偏析物やボイドな
どの欠陥を発生させることがない。これによって嵌合間
隙を大きくすることができ、リーマ加工からキリ加工に
変換できる効果がある。また作業時間もほとんど変わら
ずにろう付できる。As described above, according to the present invention, by performing brazing using a brazing filler metal in which metal or inorganic powder is mixed into Ni brazing filler metal, even if the brazing gap is large, the brazing strength is reduced. First, no defects such as harmful segregations or voids are generated in the brazing layer. This has the effect of increasing the fitting gap and allowing conversion from reaming to drilling. In addition, brazing can be done with almost no change in working time.
第１図（ａ）〜（Ｃ）はこの発明の一実施例による高温
耐熱ろうのろう付作用を示す断面正面図、第２図は従来
の高温耐熱ろうのろう行倒を示す断面図、第３図（ａ）
、 （ｂ）はこの高温耐熱ろうのろう付作用を示す断
面図、第４図（ａ）〜（Ｃ）はろう付間隙が大きい時に
ろう付不良が発生する様子を示した断面図で、第５図は
ろう材中の金属粉末の割合と継手強さとの関係を示すグ
ラフ図である。
図において、１はバイブ、２は被ろう打部（被ろう付母
材）、１０はＮｉ粉混入ろう材（ろう材）。
なお、図中、同一符号は同一または相当部分を示す。
特
許
出
願
人
三菱電機株式会社
■
第
図1(a) to (C) are sectional front views showing the brazing action of a high temperature heat resistant solder according to an embodiment of the present invention; FIG. 2 is a sectional view showing the brazing action of a conventional high temperature heat resistant solder; Figure 3 (a)
, (b) is a cross-sectional view showing the brazing action of this high-temperature heat-resistant solder, and Figures 4 (a) to (C) are cross-sectional views showing how brazing failure occurs when the brazing gap is large. FIG. 5 is a graph showing the relationship between the proportion of metal powder in the brazing filler metal and joint strength. In the figure, 1 is a vibrator, 2 is a brazing part (to be covered by brazing), and 10 is a brazing filler metal mixed with Ni powder (brazing filler metal). In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Patent applicant Mitsubishi Electric Corporation■ Figure
Claims (2)
つとする高温耐熱ろう材を使用して行われる高温耐熱ろ
うのろう付方法において、前記高温耐熱ろう材が、ろう
付温度において前記拡散しやすい元素を吸収する性質を
有する物質の粉末を含有し、該ろう材を前記被ろう付母
材に接触させた状態で所定のろう付温度に加熱すること
を特徴とする高温耐熱ろうのろう付方法。(1) In a high-temperature heat-resistant brazing method using a high-temperature heat-resistant brazing filler metal whose constituent elements include an element that easily diffuses into the base material to be brazed, the high-temperature heat-resistant brazing filler metal is A high-temperature heat-resistant brazing brazing material that contains powder of a substance that has the property of absorbing the easily diffusible element, and is heated to a predetermined brazing temperature while the brazing material is in contact with the base material to be brazed. brazing method.
するＮｉろうであり、ろう材の重量を基準として１〜５
％のＮｉ粉末またはステンレス粉末を混合したことを特
徴とする請求項第１項記載の高温耐熱ろうのろう付方法
。(2) The high-temperature heat-resistant brazing filler metal is a Ni brazing filler metal containing Ni-Cr-B, and is 1-5% based on the weight of the brazing filler metal.
% of Ni powder or stainless steel powder is mixed therein. 2. The method of brazing a high temperature heat resistant brazing material according to claim 1, wherein % of Ni powder or stainless steel powder is mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1245805A JPH084924B2 (en) | 1989-09-21 | 1989-09-21 | High temperature heat resistant brazing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1245805A JPH084924B2 (en) | 1989-09-21 | 1989-09-21 | High temperature heat resistant brazing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03110061A true JPH03110061A (en) | 1991-05-10 |
| JPH084924B2 JPH084924B2 (en) | 1996-01-24 |
Family
ID=17139107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1245805A Expired - Fee Related JPH084924B2 (en) | 1989-09-21 | 1989-09-21 | High temperature heat resistant brazing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH084924B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5844962A (en) * | 1981-08-26 | 1983-03-16 | ソシエテ・ナシオナル・デテユ−ド・エ・ドウ・コンストリユクシオン・ドウ・モト−ル・ダヴイアシオン“エス・エヌ・ウ・セ・エム・ア−” | Connection due to diffusion soldering |
| JPH01186290A (en) * | 1988-01-22 | 1989-07-25 | Mitsubishi Metal Corp | Liquid phase diffusion joining method for ni base heat resistant alloy member |
-
1989
- 1989-09-21 JP JP1245805A patent/JPH084924B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5844962A (en) * | 1981-08-26 | 1983-03-16 | ソシエテ・ナシオナル・デテユ−ド・エ・ドウ・コンストリユクシオン・ドウ・モト−ル・ダヴイアシオン“エス・エヌ・ウ・セ・エム・ア−” | Connection due to diffusion soldering |
| JPH01186290A (en) * | 1988-01-22 | 1989-07-25 | Mitsubishi Metal Corp | Liquid phase diffusion joining method for ni base heat resistant alloy member |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH084924B2 (en) | 1996-01-24 |
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