JP2003117678A - Composite material for brazing and brazed product using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite material for brazing having good brazing characteristics and having the good heat resistance, oxidation resistance, corrosion resistance and toughness of a brazing layer and a brazed product which is good in the reliability of joined parts and is low in a manufacturing cost. SOLUTION: The composite material 10 for brazing consists of two layers; a Ti or Ti alloy layer 12 and an Ni or Ni alloy layer 13 on the surface of a base material 11 and is formed with the brazing layer 15 having a composition ratio of Ti-1 to 40 wt.% Ni.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing composite material and a brazing product using the same, and more particularly to a composite material used for brazing heat exchangers and fuel cell members and brazing using the same. It is about products.

[0002]

2. Description of the Related Art Stainless steel based clad materials are used as joining materials for automobile oil coolers. In this, a Cu material having a function as a brazing material is clad on one side or both sides of a stainless steel plate which is a base material.

As a brazing material for members made of stainless steel, Ni-based or Co-based alloys, various Ni brazing materials having excellent oxidation resistance and corrosion resistance at the joint are specified by the JIS standard.

Further, Ni used for joining heat exchangers.
As a brazing filler metal, a powdered Ni brazing filler metal and a metal powder selected from Ni, Cr, or a Ni—Cr alloy is used in an amount of 4 to 2
A powdered Ni brazing material added with 2 wt% has been proposed (see Japanese Patent Laid-Open No. 2000-107883).

Further, N is formed on the surface of the stainless steel which is the base material.
with a brazing layer consisting of i and Ti, ie Ni / T
There is a self-brazing composite material having a brazing layer structure of i / stainless steel (see Japanese Patent Laid-Open No. 7-299592).

[0006]

However, a conventional brazing material or brazing composite material is exposed to a high temperature and highly corrosive gas or liquid (heat exchanger (exhaust gas recirculation device (hereinafter referred to as EGR (Exhaust Gas Recirculation When used as a brazing filler metal for ()))), there were the following problems. When the above-mentioned stainless steel-based clad material is used as a joining material for automobile oil coolers, there is no problem with heat resistance, oxidation resistance, and corrosion resistance. In this case, since the exhaust gas with high temperature and high corrosiveness is circulated in the EGR cooler, the brazing material (Cu material) of the stainless steel-based clad material has heat resistance, oxidation resistance,
Also, there is a problem that the corrosion resistance is not sufficient. Since the various Ni brazing materials described above are in powder form,
It is necessary to apply powdered Ni brazing material to each joint. That is, there is a problem that the brazing work requires a great deal of labor, so that the productivity of the brazing product is extremely low, resulting in an increase in manufacturing cost. The self-brazing composite material described above exhibits sufficient effects on heat resistance and corrosion resistance, but the wettability of the brazing material during brazing and the flowability of the molten metal are not good, and the brazing layer itself is brittle, There is a problem in that the performance (strength, fatigue characteristics) of the product after brazing is greatly reduced.
Specifically, the Ni layer and the Ti layer are melted by the heat treatment during brazing, but depending on the composition of Ni and Ti, a large amount of brittle intermetallic compounds are generated and the toughness is reduced (becomes brittle. End). As a result, the joint strength of the joint is reduced, that is, the reliability of the brazed product is reduced.

An object of the present invention, which was devised in view of the above circumstances, is to have good brazing properties, and to have good brazing layer heat resistance, oxidation resistance, corrosion resistance, and toughness. To provide a composite material for automobiles.

Another object of the present invention is to provide a brazed product having a good joint reliability and a low manufacturing cost.

[0009]

In order to achieve the above object, a brazing composite material according to the present invention is a brazing composite material in which a brazing layer is formed on the surface of a base material. , Ti or Ti alloy layer and Ni or Ni alloy layer, and has a composition ratio of Ti-1 to 40 wt% Ni.
The brazing layer is formed. Further, in a brazing composite material formed by forming a brazing layer on the surface of a base material, a Ti or Ti alloy layer, Ni or N is formed on the surface of the base material.
It is composed of three layers, i alloy layer and Fe or Fe alloy layer, and has a composition ratio of Ti-1 to 40 wt% Ni-1 to 40 wt.
The brazing layer is made of% Fe.

Here, the outermost layer of the brazing layer is a Ti alloy containing at least 0.02 to 10 wt% P and N.
It may be formed of i alloy or Fe alloy.

The base material may be made of stainless steel.

According to the above, it is possible to obtain a brazing composite material having good brazing characteristics and good heat resistance, oxidation resistance, corrosion resistance, and toughness of the brazing layer.

On the other hand, the brazing product according to the present invention is obtained by joining the above brazing composite material.

According to the above, the reliability of the joint is good,
A brazed product with a low manufacturing cost is obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

The inventors of the present invention have good brazing characteristics, have the same heat resistance, oxidation resistance, and corrosion resistance as conventional self-brazing composite materials (Ni-Ti type brazing materials), and , Ti-Ni system and Ti- with good toughness of brazing layer
As a result of various studies on the composition of the Ni—Fe based brazing composite material, Ti, Ni and Ti in the brazing layer,
By defining the composition ratios of Ni and Fe, respectively, a brazing composite material satisfying the above characteristics could be obtained.

A cross-sectional view of a first embodiment of a brazing composite material according to the present invention is shown in FIG. 1, and cross-sectional views of a first modification and a second modification of FIG. 1 are shown in FIGS. 2 and 3.

As shown in FIG. 1, in the brazing composite material 10 of the first embodiment, T is formed on the surface (only the upper surface in FIG. 1) of a base material 11 made of a stainless steel plate in order from the base material 11 side.
It is composed of two layers, i or Ti alloy layer 12 and Ni or Ni alloy layer 13, and has a composition ratio of Ti-1 to 40 wt% Ni.
The brazing layer 15 is formed. The surface of the base material 11 mentioned here indicates all the surfaces exposed to the outside.

Here, the constituent material of the base material 11 is preferably an Fe-based alloy containing Fe as a main component, and particularly preferably stainless steel.

The Ni or Ni alloy constituting the Ni or Ni alloy layer 13 is preferably a Ni--P alloy or a Ni--Cr--Fe corrosion resistant heat resistant superalloy (for example, Inconel (registered trademark)). By using these alloys, it is possible to improve the flowability and wettability of the molten metal during brazing, and when an Fe-based alloy (for example, stainless steel) is used as the base material 11, It is possible to reduce the elution of the Fe component into the brazing layer 15.

The Ni or Ni alloy layer 13, which is the outermost layer (layer exposed on the surface) of the brazing layer 15, is made of a Ni alloy containing at least one selected from P, B, and Si. Good. By containing these elements in the Ni alloy and adjusting the content of these elements,
The melting point, wettability, toughness, and bonding strength of the brazing material can be adjusted. In particular, Ni alloy with P of 0.02 to 10
By including wt%, the flowability of the brazing material, the wettability,
And the corrosion resistance can be significantly improved. The content of P is defined as 0.02 to 10 wt% is 0.02 wt.
If it is less than 10%, it is not possible to expect improvement in the flowability of molten metal. On the contrary, if it exceeds 10% by weight, the brazing layer becomes brittle and vibration fatigue characteristics and bonding strength are significantly reduced. And the preferable content is 0.5 to 8 wt%.

The Ni concentration of the entire brazing layer 15 is 1 to 4
0 wt% is preferable, more preferably 15 to 35 wt%
Is. The Ni concentration is defined as 1 to 40 wt% because it is N
If the i concentration is less than 1 wt%, the effect of lowering the melting point of the brazing material (Ti—Ni based brazing material) and the effect of improving toughness cannot be obtained, and if the Ni concentration exceeds 40 wt%, This is because the wettability and the hot water flowability are significantly reduced.

In the brazing composite material 10 of this embodiment shown in FIG. 1, the brazing layer 15 is formed only on one surface (the upper surface in FIG. 1) of the base material 11. As shown, brazing layers 15 and 15 may be formed on both surfaces (upper and lower surfaces in FIG. 2) of the base material 11 to form the brazing composite material 20. These composite materials 10 and 20 are clad materials, but the forming method is not particularly limited, and any conventional method for forming a clad material can be applied. For example, by repeatedly laminating and rolling plate materials. Examples of the method include a method of forming by rolling, or a method of stacking all plate materials and rolling them together.

The composite materials 10 and 20 shown in FIGS. 1 and 2 are
The brazing layer 15 (or 15, 1 on the surface of the plate-shaped substrate 11)
5) is formed, the brazing layer 15 may be formed on the surface of the rod-shaped or wire-shaped base material 31 to form the brazing composite material 30, as shown in FIG. In this case, the brazing layer 15 is formed by a plating method, an extrusion method, a pipe forming method, or the like.

In the present embodiment, the Ti or Ti alloy layer 12, Ni or Ni is applied from the base material 11 (or 31) side.
Although the case of the brazing layer 15 formed in the order of the alloy layer 13 has been described, each layer 1 constituting the brazing layer 15 is described.
The formation order of Nos. 2 and 13 is not particularly limited, and Ni or Ni alloy layer 13, Ti from the base material 11 (or 31) side
Alternatively, the Ti alloy layer 12 may be formed in this order.

Next, the operation of this embodiment will be described.

The composite materials 10, 20, 30 of this embodiment
In the following (hereinafter referred to as composite materials 10 to 30), the brazing layer 15 is composed of the Ti or Ti alloy layer 12 and the Ti or Ti alloy layer 13, and the composition ratio of the entire brazing layer 15 is Ti-1. Since the Ni brazing filler metal and the Ti brazing filler metal are melted by the heat treatment at the time of brazing, a brittle intermetallic compound is hardly generated, and as a result, the brazing layer 15 is The toughness does not decrease (the brazing layer 15 becomes brittle). Therefore, the joint strength of the joint, that is, the reliability of the brazed product does not deteriorate.

The composite materials 10 to 30 are composed of the base materials 11 and 3.
Since the brazing layer 15 is integrally provided on the surface of No. 1, there is no need to apply the powdered Ni brazing material to each joint at the time of brazing, unlike the conventional Ni brazing materials. The brazing work does not require much labor (the brazing workability becomes good). As a result, the yield and the productivity of the brazed product are improved, and the manufacturing cost can be reduced.

Further, the composite materials 10 to 30 are made of Ni or N.
By appropriately adding an additive element to the Ni alloy forming the i alloy layer 13, the brazing layer 15 has good molten metal flowability. Therefore, when the composite materials 10 to 30 are applied to brazing of a brazing member having a complicated brazing joint portion,
At the joint, a good joint surface and sufficient joint strength can be obtained, which in turn increases the reliability of the joint of the brazed product.

In the composite materials 10 to 30, since the brazing layer 15 is composed of the Ti or Ti alloy layer 12 and the Ni or Ni alloy layer 13, the Ni brazing material is contained in the Ti brazing material during brazing. Ni element of the material is mixed (melted).
This makes it possible to lower the melting point of a Ti brazing material made of Ti or a Ti alloy, which is difficult to function as a brazing material because of its high melting point, although it has excellent heat resistance and corrosion resistance. 1200 brazed
It becomes possible to carry out at around ℃. As a result, a Ti-based brazing part having excellent heat resistance, oxidation resistance, and corrosion resistance equivalent to those of the conventional self-brazing composite material (Ni-Ti-based brazing material) and having excellent brazing property. (Joint) can be obtained.

Further, the brazing product using the composite materials 10 to 30 is prepared by stacking and heating a brazing member (not shown) for joining with the brazing layer 15 of the composite materials 10 to 30, or Of a set of brazing members to join,
It is obtained by forming composite materials 10 to 30 using one brazing member as the base material 11 (or 31), and superposing the composite materials 10 to 30 on the other brazing member and heating.

Next, another embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 4 shows a sectional view of a second embodiment of the brazing composite material according to the present invention, and FIGS. 5 and 6 show sectional views of a first modification and a second modification of FIG. The same members as those in FIGS. 1 to 3 are designated by the same reference numerals.

As shown in FIG. 4, in the brazing composite material 40 of the second embodiment, F is formed on the surface (only the upper surface in FIG. 4) of the base material 11 made of a stainless steel plate in order from the base material 11 side.
A brazing layer 45 consisting of three layers, e or Fe alloy layer 44, Ti or Ti alloy layer 12, and Ni or Ni alloy layer 13, and having a composition ratio of Ti-1 to 40 wt% Ni-1 to 40 wt% Fe. Is formed. Base material 1 here
The surface 1 indicates all the surfaces exposed to the outside.

Here, the base material 11, the Ti or Ti alloy layer 12, and the Ni or N in the composite material 40 of the present embodiment.
The i alloy layer 13 is the same as the base material 11, the Ti or Ti alloy layer 12, and the Ni or Ni alloy layer 13 in the composite materials 10 to 30 of the previous embodiment, and therefore a new description is omitted.

The Fe or Fe alloy constituting the Fe alloy layer 44 is not particularly limited, but it is possible to improve the wettability of the brazing filler metal and the flowability of the molten metal during brazing, and the brazing layer A Fe alloy having good heat resistance, oxidation resistance, corrosion resistance, and toughness of No. 45 is preferable.
42 wt% Ni etc. are mentioned.

The Fe concentration of the whole brazing layer 45 is 1 to 4
0 wt% is preferable, and more preferably 10 to 30 wt%
Is. The Fe concentration is defined as 1 to 40% by weight is F
If the e concentration is less than 1 wt%, the brazing material (Ti-Ni-Fe
The effect of lowering the melting point and the effect of improving the toughness cannot be obtained, and when the Fe concentration exceeds 40 wt%, the wettability of the brazing material and the flowability of the molten metal remarkably decrease, and
This is because the melting point of the brazing material remarkably rises.

Further, in the brazing composite material 40 of the present embodiment shown in FIG. 4, the brazing layer 45 is formed only on one surface (upper surface in FIG. 4) of the base material 11. As shown, brazing layers 45, 45 may be formed on both surfaces (upper and lower surfaces in FIG. 5) of the base material 11 to form the brazing composite material 50. These composite materials 40 and 50 are clad materials, but the forming method is not particularly limited, and any conventional method for forming a clad material can be applied. For example, by repeatedly laminating and rolling plate materials. Examples of the method include a method of forming by rolling, or a method of stacking all plate materials and rolling them together.

The composite materials 40 and 50 shown in FIGS. 4 and 5 are
The brazing layer 45 (or 45, 4 on the surface of the plate-shaped substrate 11)
5) is formed, the brazing layer 45 may be formed on the surface of the rod-shaped or wire-shaped base material 31 to form the brazing composite material 60, as shown in FIG. In this case, the brazing layer 45 is formed by a plating method, an extrusion method, a pipe forming method or the like.

In the present embodiment, the Fe or Fe alloy layer 44, Ti or Ti from the side of the base material 11 (or 31) is used.
The case of the brazing layer 45 in which the alloy layer 12 and the Ni or Ni alloy layer 13 are formed in this order has been described. However, the order of forming the layers 44, 12, and 13 constituting the brazing layer 45 is not particularly limited. Instead, it can be formed with all possible combinations.

Composite materials 40, 50, 60 of the present embodiment
Also in (hereinafter, referred to as composite materials 40 to 60), the same operational effects as those of the composite materials 10 to 30 of the previous embodiment can be obtained.

By forming the Fe or Fe alloy layer 44 as the brazing layer 45 in contact with the base material 11 (or 31), the base material 11 is made of a non-metal material, for example, a plastic product such as FRP. Is possible, in this case
The weight can be reduced as compared with the composite material in which the base material 11 is made of a metal material.

The composite materials 10 to 60 of this embodiment are EG
The use is not limited to heat exchangers such as R coolers that are exposed to high temperature and highly corrosive gases or liquids, and in addition, for example, coolers for reformers of fuel cells and fuel cell members. It is also applicable to various uses such as.
In particular, the composite materials 30 and 60 can be applied not only to EGR coolers, heat exchangers such as fuel cell reformer coolers, fuel cell members, but also oil coolers, radiators, secondary battery members, and the like. Is.

It is needless to say that the embodiments of the present invention are not limited to the above-mentioned embodiments, and various other embodiments are possible.

[0045]

[Example] (Example 1) A Ti strip having a thickness of 0.5 mm is formed on the surface of a stainless steel strip having a thickness of 2.5 mm and a width of 150 mm, which is made of SUS304 (JIS standard). Material, 0.1 mm thick Ni strip is clad by rolling method, and the composition of the whole brazing layer is Ti-
A composite substrate of 30 wt% Ni was prepared. Then, rolling was repeatedly performed on the composite base material to prepare a brazing composite material having a total brazing layer thickness of 70 μm (0.07 mm).

(Example 2) On the surface of the same stainless steel strip as in Example 1, an Fe strip with a thickness of 0.35 mm, a Ti strip with a thickness of 1.2 mm, in that order from the stainless steel strip side,
And a Ni strip having a thickness of 0.1 mm is clad by a rolling method, and the composition of the entire brazing layer is Ti-10 wt% Ni-3.
A composite base material having 0 wt% Fe was prepared. Then, rolling was repeatedly performed on the composite base material to prepare a brazing composite material having a total brazing layer thickness of 70 μm (0.07 mm).

(Comparative Example 1) On the surface of the same stainless steel strip as in Example 1, the thickness 1 was sequentially formed from the stainless steel strip side.
A 0.0 mm Ti strip and a 0.03 mm thick Ni strip are clad by a rolling method, and the composition of the entire brazing layer is Ti.
A composite substrate of -0.5 wt% Ni was prepared. Then, rolling was repeatedly performed on the composite base material to prepare a brazing composite material having a total brazing layer thickness of 70 μm (0.07 mm).

(Comparative Example 2) A Ti strip having a thickness of 0.5 mm and a Ni strip having a thickness of 0.38 mm were rolled on the surface of the same stainless steel strip as in Example 1 in order from the stainless steel strip side. Clad by the method and the composition of the whole brazing layer is Ti
A composite substrate of -60 wt% Ni was prepared. afterwards,
By repeatedly rolling the composite base material, a brazing composite material having a total brazing layer thickness of 70 μm (0.07 mm) was produced.

(Comparative Example 3) On the surface of the same stainless steel strip as in Example 1, an Fe strip having a thickness of 6.8 mm, a Ti strip having a thickness of 1.5 mm, and a Ti strip having a thickness of 1.5 mm in this order from the stainless steel strip side. A 0.1 mm thick Ni strip is clad by a rolling method, and the composition of the entire brazing layer is Ti-0.5 wt% Ni-
A composite base material of 30 wt% Fe was prepared. Then, rolling was repeatedly performed on the composite base material to prepare a brazing composite material having a total brazing layer thickness of 70 μm (0.07 mm).

(Comparative Example 4) On the surface of the same stainless steel strip as in Example 1, an Fe strip having a thickness of 0.56 mm, a Ti strip having a thickness of 0.33 mm, and a Ti strip having a thickness of 0.33 mm in this order from the stainless steel strip side. A 1.0 mm thick Ni strip is clad by a rolling method, and the composition of the entire brazing layer is Ti-60 wt% Ni.
A composite substrate of -30 wt% Fe was prepared. afterwards,
By repeatedly rolling the composite base material, a brazing composite material having a total brazing layer thickness of 70 μm (0.07 mm) was produced.

(Comparative Example 5) On the surface of the same stainless steel strip as in Example 1, an Fe strip having a thickness of 0.1 mm, a Ti strip having a thickness of 35 mm, and a thickness were sequentially formed from the stainless steel strip side. 2.0 mm Ni strip is clad by rolling method,
The composition of the entire brazing layer is Ti-10 wt% Ni-0.5.
A composite substrate was prepared that was wt% Fe. Then, rolling was repeatedly performed on the composite base material to prepare a brazing composite material having a total brazing layer thickness of 70 μm (0.07 mm).

(Comparative Example 6) On the surface of the same stainless steel strip as in Example 1, an Fe strip having a thickness of 0.7 mm, a Ti strip having a thickness of 5.9 mm, and a Ti strip having a thickness of 5.9 mm in this order from the stainless steel strip side. A 1.0 mm thick Ni strip is clad by a rolling method and the composition of the entire brazing layer is Ti-10 wt% Ni-6.
A composite base material having 0 wt% Fe was prepared. Then, rolling was repeatedly performed on the composite base material to prepare a brazing composite material having a total brazing layer thickness of 70 μm (0.07 mm).

(Conventional Example 1) A Cu base material having a thickness of 0.3 mm was clad on the surface of the same stainless steel base material as in Example 1 by a rolling method to prepare a composite base material. After that, rolling is repeatedly performed on the composite base material so that the brazing layer (Cu
A brazing composite material having a layer thickness of 70 μm was produced.

(Prior Art Example 2) A commercially available powdered Ni brazing material (average particle size: 35 μm) was formed on the surface of the same stainless steel strip as in Example 1.
The kneaded material in which m) was melted with a binder of synthetic resin (polymer resin) was applied to prepare a brazing composite material.

Examples 1 and 2, Comparative Example 1, and Conventional Example 1,
Table 1 shows the layer structure of the composite material of No. 2 and the composition of the entire brazing layer.

[0056]

[Table 1]

Next, each composite material is heated in a vacuum furnace to melt the brazing layer, and their brazing performance (corrosion resistance, brazing characteristics (brazing material wettability, molten metal flowability), brazing layer). Toughness, brazing productivity (workability) and their evaluation (comprehensive evaluation). Table 2 shows the evaluation results of the brazing performance.

Here, the corrosion resistance is evaluated by immersing the laminate or each composite material in a corrosive solution containing chlorine ions, nitrate ions, and sulfate ions for 1000 hours to perform a corrosion test, and thereafter, the laminate product. Alternatively, each composite material was taken out of the solution, the structure of the brazed portion was observed, and the presence or absence of corrosion was examined.

The wettability of the brazing material was evaluated by placing a stainless steel pipe made of SUS304 on the surface of the brazing layer of each composite material and heating it to 1150 ° C. to perform brazing. The fillet (chamfer) shape was used for evaluation.

[0060]

[Table 2]

As shown in Table 2, in the composite materials of Examples 1 and 2 which are the brazing composite material according to the present invention, the composition of Ni or Ni, Fe of the entire brazing layer is within the specified range (1 to 1). 40
wt%), the corrosion resistance of the brazing layer, the brazing characteristics, the toughness of the brazing layer, and the brazing productivity were all good, and the overall evaluation was good.

On the other hand, in the composite materials of Comparative Examples 1, 3, and 5, both the corrosion resistance of the brazing layer and the brazing productivity are good, and the brazing characteristics are not problematic. Although it was (somewhat good), the composition of Ni or Ni, Fe in the entire brazing layer was lower than the specified range of 0.5 wt.
%, A large amount of brittle intermetallic compound was generated in the brazing layer, and the toughness of the brazing layer was low. Therefore, the comprehensive evaluation was poor.

The composite materials of Comparative Examples 2, 4 and 6 have good corrosion resistance, toughness, and brazing productivity of the brazing layer, but the Ni or Ni, Fe composition of the entire brazing layer is Since the content was 60 wt%, which was higher than the specified range, the brazing material did not have good wettability and molten metal flowability. For this reason,
The overall evaluation was poor.

The composite material of Conventional Example 1 had good brazing characteristics, toughness of the brazing layer, and brazing productivity, but the brazing layer was formed of only the Cu brazing material. The corrosion resistance of the coating layer was poor, and the comprehensive evaluation was poor.

In the composite material of Conventional Example 2, the brazing layer had good corrosion resistance, brazing characteristics, and toughness, but the brazing material in the brazing layer was a powdered Ni brazing material. The brazing productivity was poor and the overall evaluation was poor.

From the above, the composite materials of Examples 1 and 2 which are the brazing composite material according to the present invention have corrosion resistance of the brazing layer,
Since the brazing characteristics, the toughness of the brazing layer, and the brazing productivity are all good, it can be seen that the brazing composite material has excellent brazing performance and reliability of the brazing layer.

[0067]

In summary, according to the present invention, the following excellent effects are exhibited. (1) It is possible to obtain a brazing composite material having good brazing properties and having good heat resistance, oxidation resistance, corrosion resistance, and toughness of the brazing layer. (2) It is possible to obtain a brazed product having a good joint reliability and a low manufacturing cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of a brazing composite material according to the present invention.

FIG. 2 is a sectional view showing a first modification of FIG.

FIG. 3 is a sectional view showing a second modification of FIG.

FIG. 4 is a sectional view of a second embodiment of a brazing composite material according to the present invention.

5 is a cross-sectional view showing a first modification example of FIG.

6 is a sectional view showing a second modification of FIG.

[Explanation of symbols]

10, 20, 30, 40, 50, 60 Brazing composite material 11, 31 Base material 12 Ti or Ti alloy layer 13 Ni or Ni alloy layer 15, 45 Brazing layer 44 Fe or Fe alloy layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideyuki Sagawa             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. (72) Inventor Masayoshi Aoyama             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. (72) Inventor Shirai Kaku             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd.

Claims (5)

[Claims] 1. A brazing composite material having a brazing layer formed on the surface of a base material, wherein Ti or T is formed on the surface of the base material.
A brazing composite material comprising a brazing layer composed of two layers, i alloy layer and Ni or Ni alloy layer, and having a composition ratio of Ti-1 to 40 wt% Ni. 2. A brazing composite material having a brazing layer formed on the surface of a base material, wherein Ti or T is formed on the surface of the base material.
It is composed of three layers, i alloy layer, Ni or Ni alloy layer, and Fe or Fe alloy layer, and has a composition ratio of Ti-1 to 40 wt.
A brazing composite material, comprising a brazing layer made of% Ni-1 to 40 wt% Fe. 3. The brazing composite material according to claim 1, wherein the outermost layer of the brazing layer is formed of a Ti alloy, a Ni alloy, or an Fe alloy containing at least 0.02 to 10 wt% of P. 4. The brazing composite material according to claim 1, wherein the base material is formed of stainless steel. 5. A brazing product using a brazing composite material, which is joined by using the brazing composite material according to claim 1.