JP2002363706A - Composite material for brazing and brazed product using the composite material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite material for brazing which has satisfactory heat resistance, oxidation resistance and corrosion resistance, and in which the ratio of the erosion in a base material on brazing is low, and which has satisfactory brazing operability, and to provide a brazed product in which reliability in joints are satisfactory, and the cost of production is inexpensive. SOLUTION: In the first form of the composite material for brazing, the surface of the base material 11 is provided with a brazed layer obtained by laminating a Cu or Cu alloy layer 14, a Ti or a Ti alloy layer 13 and an Ni or Ni alloy layer 12. Further, in the second form of the composite material for brazing, the surface of the base material 11 is provided with a brazed layer obtained by laminating a Cu or Cu alloy layer 14 and a Ti or Ti alloy layer 13 at least layer by layer.

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 a heat exchanger and a fuel cell member, and brazing using the same. It is about products.

[0002]

2. Description of the Related Art A stainless steel base clad material is used as a joining material for an oil cooler for an automobile. In this method, a Cu material having a function as a brazing material is clad on one or both surfaces of a stainless steel plate as a base material.

[0003] Further, as brazing materials for members made of stainless steel, Ni-based or Co-based alloys, various Ni brazing materials having excellent oxidation resistance and corrosion resistance at joints are specified by JIS standards.

Further, Ni used for joining a heat exchanger
As a brazing material, a metal powder selected from Ni, Cr, or a Ni-Cr alloy is added to a powdery Ni brazing material by 4 to 2 times.
A powdered Ni brazing material to which 2% by weight is added has been proposed (see JP-A-2000-107883).

[0005] In addition, the surface of stainless steel as a substrate is coated with N
having a brazing layer of i and Ti, ie, Ni / T
There is a self-brazing composite material having a brazing layer structure of i / stainless steel (see JP-A-7-299592).

[0006]

However, the conventional brazing filler metal or brazing composite is exposed to a high-temperature, highly corrosive gas or liquid by a heat exchanger (exhaust gas recirculation device (hereinafter, EGR)). When used as a brazing filler metal for the cooler), the following problems have been encountered.

When the above-mentioned stainless base clad material is used as a joining material for an oil cooler for an automobile, there is no problem with respect to heat resistance, oxidation resistance, and corrosion resistance.
When the stainless steel-based clad material is used as a joining material for an EGR cooler, since a high-temperature and highly corrosive exhaust gas is circulated inside the EGR cooler, a brazing material (Cu material) of the stainless steel-based clad material is used. ), Heat resistance,
There was a problem that oxidation resistance and corrosion resistance were not sufficient.

Since the above-mentioned various Ni brazing materials are in a powder form, it is necessary to apply a powder Ni brazing material to each joint. That is, since a large amount of labor is required for the brazing operation, the productivity of the brazed product is extremely low, and as a result, there is a problem that the manufacturing cost is increased.

Although the above-mentioned self-brazing composite material exhibits a sufficient effect on heat resistance and corrosion resistance, the stainless steel of the base material is strongly eroded by the molten brazing layer during brazing, so that brazing is performed. There has been a problem that the performance (strength and fatigue properties) of the subsequent product is greatly reduced. Specifically, the Ni layer and the Ti layer are melted by the heat treatment at the time of brazing, but the reaction between Ti and the stainless steel as the base material becomes excessive because the reactivity of Ti is extremely high. This is because the Fe component of the stainless steel as the base material reacts with Ti, and a Fe-rich solid solution phase and Fe ₂ Ti,
This is because an intermetallic compound such as FeTi easily occurs.
As a result, since the Fe component of the base material melts and disperses into the brazing layer, significant erosion occurs in the base material, and the thickness and volume of the base material before brazing cannot be ensured, and the joining portion In the bonding strength, that is, the reliability of the brazed product is reduced.

One object of the present invention, which has been made in view of the above circumstances, is that heat resistance, oxidation resistance, and corrosion resistance are good.
The rate of erosion of the substrate during brazing is low, and
An object of the present invention is to provide a brazing composite material having good brazing workability.

Another object of the present invention is to provide a brazing product which has a good reliability of a joint and a low manufacturing cost.

[0012]

According to a first embodiment of the present invention, there is provided a brazing composite material having a brazing layer on a substrate surface. On the surface of the base material, a Cu or Cu alloy layer, a Ti or Ti alloy layer, and a Ni or Ni alloy layer are stacked and provided. A second embodiment of the brazing composite material according to the present invention is directed to a brazing composite material having a brazing layer on the surface of a substrate, wherein Cu or C
A u alloy layer and at least one Ti or Ti alloy layer are laminated and provided.

According to the above arrangement, the surface of the substrate is coated with N
Since a brazing layer composed of a brazing material containing i, Ti, and Cu is provided, compared with a conventional brazing composite material, heat resistance, oxidation resistance, and corrosion resistance that are equal or more than equivalent are obtained. Thus, a brazing composite material having a low rate of erosion of the substrate during brazing can be obtained.

On the other hand, a brazing product using the brazing composite material according to the present invention is a product joined using the above-mentioned brazing composite material.

By performing brazing (joining) using the brazing composite material having the above-described structure, the reliability of the joint of the brazed product is improved.

[0016]

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

[0017] The inventors of the present invention have the same heat resistance and corrosion resistance as the conventional self-brazing composite material (Ni-Ti-based brazing material), and at the time of brazing, the base material of the stainless steel Ti As a result of various studies on the configuration of a brazing composite material that is less likely to erode (melt and disperse into the brazing layer) and that is easy to braze,
By using Ti and Cu or Ti, Cu, and Ni, a brazing composite material satisfying the above-mentioned characteristics could be obtained.

FIG. 1 is a cross-sectional view of a first embodiment of a brazing composite material according to the present invention, and FIG. 2 is a cross-sectional view showing a first modification of FIG. 1, and FIG. FIG. 3 shows a cross-sectional view of the second embodiment. 2 and 3, FIG.
The same members as those described above are denoted by the same reference numerals.

As shown in FIG. 1, a brazing composite material 10 according to the present embodiment has a brazing layer (base material) on one side (the upper surface in FIG. 1) of a base material 11 made of a stainless steel plate. 11 or Ni alloy layer 12, Ti or T
This is a clad material provided with an i-alloy layer 13 and a Cu or Cu alloy layer 14). Here, the brazing layer is made of the base material 1
1 may be provided not only on one side but also on both sides (upper and lower surfaces in FIG. 1).

The Ni or the Ni alloy constituting the Ni alloy layer 12 is preferably a Ni-P-based alloy or a Ni-Cr-Fe-based corrosion-resistant and heat-resistant superalloy (for example, Inconel (registered trademark)). This is because these alloys can improve the flowability and wettability during brazing and reduce the solubility of the Fe component in stainless steel.

The Cu or the Cu alloy constituting the Cu alloy layer 14 is preferably a Cu-Ni alloy or a Cu-Cr alloy. This is because Ni and Cr have the effect of improving the corrosion resistance and oxidation resistance of the brazed portion (joined portion).

Further, the method of forming the clad material in which the brazing layer is provided on the surface of the base material 11 is not particularly limited, and any conventional method for forming a clad material can be applied. After laminating plate materials, a method of integrating them by rolling may be used.

In FIG. 1, the Ni or Ni alloy layers 12 and 1 are arranged on the surface of the substrate 11 in this order from the substrate 11 side.
2, Ti or Ti alloy layers 13, 13 and Cu or Cu
Although the case where the alloy layers 14 and 14 are provided has been described, the order of forming the layers 12, 13 and 14 is not limited to this. For example, as shown in FIG. 2, the Cu or Cu alloy layer 1 is formed on the surface of the substrate 11 in order from the substrate 11 side.
4, 14, a composite material 20 provided with Ti or Ti alloy layers 13 and 13 and Ni or Ni alloy layers 12 and 12 may be used. Further, as shown in FIG. 3, the Cu or Cu alloy layers 14, 14, T
The composite material 30 provided with the i or Ti alloy layers 13, 13 and the Cu or Cu alloy layers 14, 14 may be used. Here, it is preferable to use a Cu—Ni-based alloy layer as the Cu or Cu alloy layer 14, and this Cu—Ni-based alloy layer is disposed between the base material 11 and the Ti or Ti alloy layer 13, and the It is particularly preferable to form a barrier layer for preventing the reaction between the Fe component and Ti.

Further, the outermost layer of the brazing layer (FIGS. 1 and 3)
In FIG. 2, a Cu or Cu alloy layer 14, and in FIG.
B or Si is added to the metal or alloy constituting the i-alloy layer 12).
May be added. Thereby, the melting point, wettability, toughness, and joining strength of the brazing material can be adjusted.

Next, the optimal proportions of Cu, Ni and Ti in the entire brazing layer provided on the surface of the base material 11 will be described.

The ratio of Cu to the entire brazing layer (brazing material) (weight of Cu / weight of entire brazing layer) is 10 to 10%.
60 wt% is preferred. This is because the ratio of Cu is 10 wt.
%, The effect of lowering the melting temperature of the entire brazing layer cannot be sufficiently obtained, and if it exceeds 60% by weight, the corrosion resistance and the oxidation resistance deteriorate.

The proportion of Ni in the entire brazing layer (Ni
Weight / total weight of brazing layer) is 10 to 60 wt%
Is preferred. If the Ni content is less than 10 wt%, the corrosion resistance and oxidation resistance are reduced, and the Ni content is reduced to 60 wt%.
Is exceeded, the melting temperature of the entire brazing layer rises and the substrate 1
This is because the reaction between 1 and Ti becomes excessive.

The proportion of Ti in the entire brazing layer (Ti
Weight / weight of the entire brazing layer) is 10 to 40 wt%
Is preferred. If the proportion of Ti is less than 10 wt%, the corrosion resistance and oxidation resistance decrease, and
Is exceeded, the melting temperature of the entire brazing layer rises and the substrate 1
This is because the reaction between 1 and Ti becomes excessive, the reaction with the Fe component in the stainless steel becomes remarkable, and the erosion of the substrate 11 increases.

Next, the operation of the present embodiment will be described.

In order to minimize the reaction between the base material 11 made of stainless steel and Ti in the brazing material, it is necessary to reduce the brazing temperature to suppress the reaction between the base material 11 and Ti. In the composite material 10 according to the present embodiment, a Ni or Ni alloy layer 12, a Ti or Ti alloy layer 13, and a Cu or Cu alloy layer 14 are provided on the surface of the base material 11 in this order from the base material 11 side. . By configuring the brazing layer with a brazing material of Ni, Ti, and Cu, the melting temperature of the brazing layer can be reduced. Cu-Ni-Ti-based composition and eutectic temperature of the brazing material specifically consider the results for eutectic temperature of the brazing material of the composition of Cu ₂ Ti-23 at% Ni is 960 ° C., CuTi-9 atomic% Ni The eutectic temperature of the brazing material having the composition of 924 ° C. is 924 ° C., which is much lower than the melting temperature (about 1000 ° C.) of the conventional high heat and corrosion resistant brazing material. Thereby, the base material 11
And the reaction of Ti can be suppressed.

In order to suppress the reaction between the base material 11 and Ti as much as possible, the amount of Fe
It is necessary to limit the melting and dispersion of the components. Generally, the molten phase of Cu or a Cu alloy has a lower degree of erosion on stainless steel than the molten phase of a Ni—Ti alloy. In the present embodiment, since the brazing material constituting the brazing layer is made of Ni, Ti, and Cu, the melting and dispersion of the Fe component in the stainless steel can be restricted.

As described above, the brazing composite material 1 of the present embodiment
According to Nos. 0 to 30, by providing a brazing layer made of a brazing material containing Ni, Ti, and Cu on the surface of a base material 11 made of stainless steel, a conventional self-brazing composite material (Ni -Ti-based brazing material) and can suppress the reaction between the base material 11 and the Ti in the brazing material during brazing (that is, the base material 11 during brazing). Erosion rate is lower).

Since the brazing composite materials 10 to 30 are clad materials, one of the brazing members to be joined is used as a base material to form the composite materials 10 to 30 (or to perform the joining). Composite material 10-30 between joints of attachment members
Are arranged), and the brazing members are joined to each other using the composite materials 10 to 30 to produce a brazing product. Thus, like various conventional Ni brazing materials, a powdered Ni brazing material is applied to each joint. It does not require the work of applying each, and the brazing work does not require much labor (the brazing workability is improved). As a result, the yield of brazed products
The productivity is improved, and the production cost can be reduced.

Further, the brazing composite materials 10 to 30
The brazing material constituting the brazing layer has a low rate of erosion of the base material 11 at the time of brazing, so that even after brazing, the thickness and volume of the base material 11 are almost the same as before brazing. There is no. As a result, the joining strength of the joining portions of the brazing members does not decrease, and the reliability of the joining portions of the brazing products is enhanced.

The brazing composite materials 10 to 3 of the present embodiment
0 does not limit its use only to heat exchangers exposed to high-temperature and highly corrosive gases or liquids such as EGR coolers. In addition, for example, fuel cell reformer coolers, It is also applicable to various uses such as fuel cell members.

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

FIG. 4 is a sectional view showing a third embodiment of the brazing composite material according to the present invention, and FIG. 5 is a sectional view showing a first modification of FIG.
FIG. 6 is a sectional view of a fourth embodiment of the brazing composite material according to the present invention. 5 and 6, the same members as those in FIG. 4 are denoted by the same reference numerals.

The brazing composite material 10 of the previous embodiment is
This was a clad material in which a brazing layer was provided on the surface of a base material 11 made of a plate material.

On the other hand, as shown in FIG. 4, the brazing composite material 40 according to the present embodiment has a brazing layer (from the side of the base material 41) on the outer periphery of the rod-shaped or wire-shaped base material 41. In order, Ni or Ni alloy layer 42, Ti or Ti alloy layer 4
3 and a Cu or Cu alloy layer 44).

The brazing layer is formed by a plating method, an extrusion method, a tube-forming method, or the like.

In FIG. 4, the Ni or Ni alloy layer 42 and the T
The case where the i or Ti alloy layer 43 and the Cu or Cu alloy layer 44 are provided has been described.
The order of forming 44 is not limited to this. For example, as shown in FIG. 5, a composite material 5 in which a Cu or Cu alloy layer 44, a Ti or Ti alloy layer 43, and a Ni or Ni alloy layer 42 are provided on the outer periphery of a
It may be 0. Also, as shown in FIG.
The Cu or Cu alloy layer 4
4, a composite material 60 provided with a Ti or Ti alloy layer 43 and a Cu or Cu alloy layer 44 may be used. Where Cu
Alternatively, it is preferable to use a Cu—Ni-based alloy layer as the Cu alloy layer 44. This Cu—Ni-based alloy layer is disposed between the base material 41 and the Ti or Ti alloy layer 43, and the Fe component in the stainless steel and the Ti It is particularly preferable to use a barrier layer that prevents the reaction of

The brazing composite 40 according to the present embodiment
Also in the composite materials 10 to 3 according to the previous embodiment,
It goes without saying that the same operation and effect as those of 0 can be obtained.

The brazing composite materials 40 to 6 of the present embodiment
0 can be applied to an oil cooler, a radiator, a secondary battery member, and the like in addition to a heat exchanger such as a cooler for an EGR, a cooler for a reformer of a fuel cell, and a fuel cell member.

[0044]

(Example 1) A stainless steel strip made of SUS304 (JIS standard) and having a thickness of 2.5 mm and a width of 150 mm was formed on a stainless steel strip in order from the stainless steel strip side.
Laminate and roll the Ti strip and Cu strip,
A clad material was formed. Thereafter, rolling was repeatedly performed on the clad material to produce a brazing composite material having a total brazing layer thickness of 70 μm. Here, the ratio of Ni, Ti, and Cu in the entire brazing layer is 40 wt% N.
The thickness of each strip was adjusted to be i-20 wt% Ti-40 wt% Cu.

(Example 2) A brazing composite material was produced in the same manner as in Example 1 except that the arrangement of the Ni strip and the Cu strip was reversed.

(Example 3) Cu-3 instead of Cu strip material
A brazing composite material was produced in the same manner as in Example 1 except that a 0 wt% Ni alloy strip was used. Here, the ratio of Ni, Ti, and Cu in the entire brazing layer is 52 w
The thickness of each strip was adjusted to be t% Ni-20wt% Ti-28wt% Cu.

Example 4 A brazing composite material was produced in the same manner as in Example 1 except that a Cu-30 wt% Ni alloy strip was used instead of the Ni strip and the Cu strip. Here, the proportion of Ni, Ti, and Cu in the entire brazing layer is 24 wt% Ni-20 wt% Ti-5.
The thickness of each strip was adjusted to be 6 wt% Cu.

Comparative Example 1 A brazing composite material was produced in the same manner as in Example 3. Here, the ratio of Ni, Ti, and Cu in the entire brazing layer is 60 wt% Ni-3.
The thickness of each strip was adjusted to be 5 wt% Ti-5 wt% Cu.

Comparative Example 2 A brazing composite material was manufactured in the same manner as in Example 1. Here, the ratio of Ni, Ti, and Cu in the entire brazing layer is 20 wt% Ni-1.
The thickness of each strip was adjusted to be 0 wt% Ti-70 wt% Cu.

(Comparative Example 3) On the same stainless steel strip as in Example 1, a Ti strip and a Cu-30 wt% Ni alloy strip were laminated and rolled in this order from the stainless steel strip side, and the cladding was performed. A material was formed. Thereafter, rolling was repeatedly performed on the clad material to produce a brazing composite material having a total brazing layer thickness of 70 μm. Here, the ratio of Ni, Ti, and Cu to the entire brazing layer is 3
The thickness of each strip was adjusted to be 0 wt% Ni-20 wt% Ti-50 wt% Cu.

(Comparative Example 4) On the surface of the same stainless steel strip as in Example 1, a thickness of 0.
A 2 mm Ti strip and a 0.15 mm thick Ni strip were laminated and rolled to form a clad material. Thereafter, rolling was repeatedly performed on the clad material to produce a brazing composite material having a total brazing layer thickness of 50 μm.

(Comparative Example 5) On the surface of the same stainless steel strip as in Example 1, a thickness of 0.
08 mm Ni strip, 0.2 mm thick Ti strip, and 0.08 mm Ni strip were laminated and rolled to form a clad material. Thereafter, rolling is repeatedly performed on the clad material, and the thickness of the entire brazing layer is 50 μm.
m was prepared.

(Conventional Example 1) A Cu strip having a thickness of 0.5 mm was laminated and rolled on the surface of the same stainless steel strip as in Example 1 to form a clad material. Thereafter, rolling is repeatedly performed on the clad material so that the thickness of the Cu layer is 5 mm.
A 0 μm brazing composite was produced.

(Conventional Example 2) On the surface of the same stainless steel strip as in Example 1, a commercially available powdered Ni brazing material (average particle size 35 μm) was used.
m) was mixed with a kneaded material dissolved in a synthetic resin (polymer resin) binder to prepare a brazing composite material.

Table 1 shows the specifications of the brazing composite materials of Examples 1 to 4, Comparative Examples 1 to 5, and Conventional Examples 1 and 2.

[0056]

[Table 1]

Next, for each composite material, the rate of erosion (corrosion rate) of the stainless steel strip as the base material, corrosion resistance, wettability of the brazing material, and brazing productivity (workability).
Was evaluated, and a comprehensive evaluation was performed from these evaluation results. Table 2 shows various evaluation results.

Here, the rate of erosion was evaluated by heating each composite material to a maximum of 1150 ° C. in a vacuum furnace to melt the brazing layer, and then observing the cross section of each composite material. Thickness ratio of stainless steel strip material (thickness after heat treatment x 10
0 / plate thickness (%) before heat treatment). The evaluation of corrosion resistance was performed by placing each composite material in a corrosive solution containing chloride ions, nitrate ions, and sulfate ions.
A corrosion test was performed by immersion for 00 hours, and then each composite material was taken out of the solution, and the structure of the brazed portion was observed to check whether or not corrosion had occurred. The wettability was evaluated by placing a stainless steel pipe made of SUS304 on the surface of the brazing layer of each composite material and maximizing 115 in a vacuum furnace.
The evaluation was performed based on the fillet (chamfer) shape of the brazing portion after brazing by heating to 0 ° C.

[0059]

[Table 2]

As shown in Table 2, the brazing composite materials of Examples 1 to 4 which are the brazing composite materials according to the present invention have a brazing layer formed of a brazing material containing Ni, Ti and Cu. Further, the proportion of Cu in the entire brazing layer is within a specified range (1
0 to 60 wt%), the residual ratio of the substrate thickness was 93, 95, 90, and 97 (%), respectively. In addition, corrosion resistance, wettability, and brazing productivity were all good. From these evaluation results, the overall evaluation was also good (○).

On the other hand, although the composite material of Comparative Example 1 had good corrosion resistance, wettability, and brazing productivity, the proportion of Cu in the entire brazing layer was out of the specified range. Of the base material, the residual thickness of the substrate is 80%.
%, And the erosion rate was slightly higher. From these evaluation results, the overall evaluation was somewhat difficult (△).

The composite material of Comparative Example 2 had a high base material residual ratio of 97% and good wettability and brazing productivity, but had a high Cu content in the entire brazing layer.
Is 70% by weight, which is out of the specified range, that is, the ratio of Ni and Ti is as low as 30% by weight. Therefore, the corrosion resistance is not good, and corrosion is observed in the brazed portion. From these evaluation results, the overall evaluation was poor (x).

In the composite material of Comparative Example 3, the brazing layer was formed of a brazing material of Ti and Cu, and the proportion of Cu in the entire brazing layer was 50 wt% within a specified range. Although the wettability and brazing productivity were all good, the residual thickness of the substrate was 85 because of the brazing layer structure in which the stainless steel strip and the Ti strip were in direct contact.
%, And the erosion rate was slightly higher. From these evaluation results, the overall evaluation was somewhat difficult (△).

The composite materials of Comparative Examples 4 and 5 were all excellent in corrosion resistance, wettability, and brazing productivity. However, in the composite material of Comparative Example 5, since the brazing layer was formed of Ni and Ti brazing materials and did not contain Cu brazing material, the residual ratio of the substrate thickness was 78%, and the erosion rate was low. it was high. Further, the composite material of Comparative Example 4 had a brazing layer structure in which the brazing layer was formed of Ni and Ti brazing materials, that is, it did not include Cu brazing material and the stainless steel strip and Ti strip were in direct contact. Therefore, the residual ratio of the substrate thickness was 65%, and the erosion rate was extremely high. From these evaluation results, the overall evaluation was poor (x).

The composite material of Conventional Example 1 had a high substrate residual ratio of 96% and good wettability and brazing productivity, but only the brazing layer was made of Cu brazing material. , Corrosion resistance was not good, and corrosion was observed at the brazed portion. From these evaluation results, the overall evaluation was poor (x).

The composite material of Conventional Example 2 had a high residual thickness of the base material of 95% and good corrosion resistance and wettability, but the brazing material of the brazing layer was powdered Ni. Since it was a brazing material, the brazing productivity was not good. From these evaluation results, the overall evaluation was poor (x).

As described above, the embodiments of the present invention are not limited to the above-described embodiments, and it goes without saying that various other embodiments can be envisaged.

[0068]

In summary, according to the present invention, the following excellent effects are exhibited. (1) By providing a brazing layer composed of a brazing material containing Ni, Ti, and Cu on the surface of a base material, the heat resistance is equal to or higher than that of a conventional brazing composite material. Thus, a brazing composite material having excellent oxidation resistance, corrosion resistance, and a low rate of erosion of the substrate during brazing can be obtained. (2) By performing brazing using the brazing composite material of (1), the reliability of the joint of the brazed product is improved.

[Brief description of the drawings]

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

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

FIG. 5 is a sectional view showing a first modification of FIG. 4;

FIG. 6 is a sectional view of a fourth embodiment of the brazing composite material according to the present invention.

[Explanation of symbols]

10, 20, 30, 40, 50, 60 Brazing composite material 11, 41 Base material 12, 42 Ni or Ni alloy layer 13, 43 Ti or Ti alloy layer 14, 44 Cu or Cu alloy layer

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) C22C 19/03 C22C 19/03 G (72) Inventor Masayoshi Aoyama 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Hitachi (72) Inventor Ryokan Shirai 4-10-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture, Toyoura Plant, Hitachi Cable, Ltd.

Claims (7)

[Claims] 1. A brazing composite material having a brazing layer on the surface of a substrate, wherein a Cu or Cu alloy layer, a Ti or Ti alloy layer, and a Ni or Ni alloy layer are laminated on the surface of the substrate. A brazing composite material provided. 2. A layer structure of each layer laminated on the surface of the base material, wherein a Cu or Cu alloy layer is disposed on one surface of the Ti or Ti alloy layer, and a Ni or Ni alloy layer is disposed on the other surface. Item 7. A brazing composite material according to Item 1. 3. A brazing composite material having a brazing layer on the surface of a base material, wherein at least one of Cu or Cu alloy layer and Ti or Ti alloy layer is laminated on the surface of the base material. Characteristic brazing composite. 4. The brazing composite material according to claim 3, wherein the layer structure of each layer laminated on the surface of the base material includes a Cu or Cu alloy layer disposed on both surfaces of the Ti or Ti alloy layer. 5. The brazing composite material according to claim 1, wherein said base material is formed of stainless steel. 6. The Cu or Cu alloy layer is formed of Cu—Ni
The brazing composite material according to any one of claims 1 to 5, which is formed of an alloy. 7. A brazing product joined by using the brazing composite material according to claim 1. Description: