JP2008030102A - Brazing method of composite material for brazing, and brazed product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brazing method capable of suppressing surface discoloration of a brazing filler metal part and degradation of fluidity of a brazing filler metal caused by the components of a heat treatment atmospheric gas during the brazing heat treatment of a composite material for brazing, and a brazed product. <P>SOLUTION: In the brazing method of a composite material for brazing, the composite material for brazing having a brazing filler metal part composed of a plurality of metal layers is brazed. A composite material 10 for gas adsorption having a gas adsorption layer 15 which is lower in melting point than the brazing filler metal part of a composite material 30 for brazing and high in reactivity with gas components such as oxygen and nitrogen in an atmospheric gas in a heat treatment furnace is arranged in a brazing heat treatment furnace in a closed space. Thereafter, the gas adsorption layer 15 is melted and the gas components are adsorbed by the gas adsorption layer 15 and removed. Then, the brazing heat treatment is performed and the brazing filler metal part is melted to perform the brazing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brazing and brazing method for brazing composite materials and brazing products, and more particularly to a brazing and joining method and brazing for brazing composite materials used for brazing heat exchangers and fuel cell members. It relates to products.

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

  Further, as a brazing material for members made of stainless steel, Ni-base or Co-base alloy, various Ni brazing materials having excellent corrosion resistance at the brazed joint are defined by JIS standards.

  Further, 4 to 22 wt% of metal powder selected from Ni, Cr, Ni—Cr alloy, or stainless steel is added to the powdered Ni brazing material as the Ni brazing material used for joining the heat exchanger. A powder Ni brazing material is proposed (see, for example, Patent Document 1).

  Further, there is a self-brazing composite material having a brazing layer made of Ni and Ti on the surface of stainless steel as a base material, that is, having a brazing layer structure of Ni / Ti / stainless steel (for example, Patent Document 2). reference).

JP 2000-107883 A Japanese Patent Laid-Open No. 7-299592

  The self-brazing composite material described in Patent Document 2 includes a Ti layer in the brazing layer.

Ti has higher reactivity with gas components such as oxygen and nitrogen than other metal elements. Therefore, when performing the brazing heat treatment, in order to reduce the gas component contained in the heat treatment atmosphere as much as possible, it is 5.0 × 10 ⁻² Pa or higher (higher than 5.0 × 10 ⁻² Pa). A degree of vacuum is required. When brazing heat treatment is performed at a vacuum level lower than that, when the brazing layer melts, it reacts with those gas components to form a compound. As a result, there is a problem that the surface of the brazing material is discolored and the hot metal flowability of the brazing material is hindered by the compound and brazing productivity is lowered.

  In order to solve these problems, there is a method in which a simple metal such as Ti or Ti alloy having high reactivity with the atmosphere component is placed in the same heat treatment furnace and reacted with the atmosphere gas component.

  However, when this method is adopted, the brazing layer of the brazing composite material is more likely to react with the atmospheric gas component, and thus the above problem cannot be solved. This is because the Ti component (brazing layer) that is melted and in the liquid phase state reacts more easily with the atmospheric gas component than the Ti component (metal alone such as Ti or Ti alloy) in the solid phase state. .

  An object of the present invention is to suppress the surface discoloration of the brazing filler metal part due to the heat treatment atmosphere gas component and the decrease in the flow property of the brazing metal during the brazing heat treatment of the brazing composite material in order to solve the problems in the prior art. It is to provide a brazing and joining method and a brazing product.

  In order to achieve the above object, the invention according to claim 1 is a method for brazing a brazing composite material having a brazing material portion composed of a plurality of metal layers, in a brazing heat treatment furnace in a closed space. A gas adsorbing composite material having a gas adsorbing layer having a lower melting point than the brazing material portion of the brazing composite material and having high reactivity with gas components such as oxygen and nitrogen in the atmosphere gas in the heat treatment furnace is disposed, Thereafter, the gas adsorption layer is melted and the gas component is adsorbed and removed by the gas adsorption layer, and then brazing heat treatment is performed to melt the brazing material portion and perform brazing.

  According to a second aspect of the present invention, only the gas adsorbing layer is melted and the brazing filler metal part is held at a temperature at which it is not melted for a predetermined time, and the gas adsorbing layer is melted to adsorb and remove the gas components. After that, it is preferable to perform brazing heat treatment by raising the temperature to the brazing temperature and melting the brazing material part to perform brazing.

  According to a third aspect of the present invention, the gas adsorbing composite material has a multilayer structure in which a gas adsorbing layer composed of a Ti or Ti alloy layer and a Ni or Ni alloy layer is stacked on the surface of the base material.

  In the invention of claim 4, the layer thickness ratio of the Ti layer to the sum of the layer thicknesses of the Ti layer and Ni layer of the gas adsorption composite material is preferably 70% or more and 82% or less.

  According to a fifth aspect of the present invention, the brazing composite material has a multi-layer structure in which the brazing material portion composed of a Ti or Ti alloy layer and a Ni or Ni alloy layer is stacked on the surface of a base material.

  In the invention of claim 6, the thickness ratio of the Ti layer to the sum of the thicknesses of the Ti layer and the Ni layer of the brazing composite material is preferably 56% or less.

  According to the seventh aspect of the present invention, at least one of the Ti layer and the Ni layer constituting the gas adsorption layer of the gas adsorption composite material may contain P.

  In the invention according to claim 8, the P concentration contained in the gas adsorption layer of the gas adsorption composite material is preferably 0.02 to 10 wt%.

  According to the ninth aspect of the present invention, at least one of the Ti layer and the Ni layer constituting the gas adsorption layer of the gas adsorption composite material includes at least one of Cu, Mn, Al, or Cr. May be.

  In a tenth aspect of the present invention, the Cu concentration contained in the gas adsorption layer of the gas adsorption composite material is preferably 0.2 to 30 wt%.

  The invention of claim 11 is formed by brazing and joining a brazing composite material and a member to be brazed using the brazing composite material brazing method according to any one of claims 1 to 10. is there.

  According to the present invention, when brazing a brazing composite material having a brazing material portion composed of a plurality of metal layers, a Ti or Ti alloy layer and a Ni or Ni alloy layer are bonded and bonded to a base material. By disposing the gas adsorption composite material in the same heat treatment furnace, the discoloration of the brazing material part and brazing product due to gas components such as oxygen and nitrogen remaining in the furnace is suppressed, and the brazing flow property is improved. Is obtained.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of the invention will be described with reference to the accompanying drawings.

  In the brazing composite material joining method according to the present embodiment, a gas adsorption composite material having a cladding layer (gas adsorption layer) that melts at a temperature lower than the melting point of the brazing material portion of the brazing composite material is brazed. This is a method in which brazing heat treatment is performed in the same heat treatment furnace as the brazing composite material.

  FIG. 1 shows a cross-sectional view of a gas adsorption composite material used in a brazing joining method according to a preferred embodiment of the present invention.

  As shown in FIG. 1, a gas adsorbing composite material 10 is composed of a gas adsorbing layer (in order from the base material 11 side) on one side (upper surface in FIG. 1) of a base material 11 made of a plate material such as an alloy. It is a clad material formed by laminating and bonding a layer (hereinafter referred to as a Ti layer) 12, a Ni or Ni alloy layer (hereinafter referred to as a Ni layer) 13) 15. Here, the gas adsorption layer (molten layer) 15 may be provided not only on one side of the substrate 11 but also on both sides (upper and lower surfaces in FIG. 1).

  The weight ratio of the Ti component in the gas adsorption layer (Ni / Ti layer) 15 clad on the gas adsorption composite material 10 is 55 to 70 mass%, preferably 58 to 67 mass%, and more preferably 60 to 65 mass%. This is because it is necessary to perform heat treatment at a temperature lower than the brazing temperature in order to prevent exposure of reaction-sensitive components to the surface layer due to diffusion of the brazing filler metal portion of the brazing composite material. The weight ratio of the components is 63 mass% which takes the lowest temperature (eutectic point: 942 ° C.) in the Ni / Ti alloy.

  Further, at least one of the Ti layer 12 and the Ni layer 13 constituting the gas adsorption layer 15 of the gas adsorption composite material 10 may contain P. The concentration of P contained in the desired gas adsorption layer 15 is 0.02 to 10 wt%.

  Further, at least one of the Ti layer 12 and the Ni layer 13 constituting the gas adsorption layer 15 of the gas adsorption composite material 10 may contain at least one of Cu, Mn, Al, or Cr. Good. For example, when Cu is contained in the gas adsorption layer 15, a desirable Cu concentration is 0.2 to 30 wt%.

  Stainless steel is mentioned as an alloy which comprises the base material 11, For example, SUS304 (JIS specification) etc. are mentioned. Further, as a configuration of the composite material 10, the gas adsorption layer 15 may be bonded to the base material 11 made of a metal other than stainless steel. However, it is desirable that the metal (base material 11) to which the gas adsorption layer 15 is bonded does not increase the melting point upon reaction between Ti and the Ni alloy.

  The thickness of the base material 11 is sufficiently thick compared with the thickness of the gas adsorption layer 15, and is formed, for example, twice or more.

  The formation method of the composite material 10 formed by cladding the gas adsorption layer 15 on the surface of the base material 11 is not particularly limited, and all conventional methods for forming the clad material can be applied. Then, the method of integrating by rolling is mentioned.

  In the composite material 10 shown in FIG. 1, the gas adsorption layer 15 has a two-layer structure. However, the present invention is not limited to this, and as shown in FIG. The composite material 20 provided with the gas adsorption layer 15 having a layer structure or more (for example, a three-layer structure of the Ni layer 13, the Ti layer 12, and the Ni layer 13 in this order from the substrate 11 side) may be used.

  Further, the gas adsorbing layer 15 is not limited to the bonding material between the plate materials. For example, a mixed powder of Ni powder and Ti powder or a powder obtained by dissolving them with a solvent such as a binder may be used. However, since it is difficult to handle the powder or the powder in a state in which the powder is hardened with a binder, it is desirable to use a plate-bonded bonding material that can be more easily handled as the gas adsorption layer 15.

  Moreover, the same effect can be obtained by using the composite material 10 without using the base material 11 and using only the Ti layer 12 and the Ni layer 13 bonded and bonded (only the gas adsorption layer 15) as the composite material. Although it can be expected, in this case, the melted component (gas adsorption layer 15) is solidified in the furnace and may adhere to the hearth and the furnace wall, which is inferior in handleability.

  Next, the brazing joining method according to the present embodiment will be described.

  As shown in FIG. 3, a brazing composite material 30 and a brazing material (pipe material) 14 are combined. The brazing composite material 30 is a clad material in which a brazing material portion (Ti layer, Ni layer in order from the base material side) is provided on one side of the base material. The thickness ratio of the Ti layer in the brazing material portion (Ti layer and Ni layer) clad by the brazing composite material 30 is 56% or less.

  Thereafter, as shown in FIG. 4, the gas adsorbing composite material 10 is disposed around the brazed product (the brazing composite material 30 and the pipe material 14). At this time, it is desirable that the gas adsorbing composite material 10 is disposed as close to and as possible to the brazed products 30 and 14. This is because the gas adsorbing composite 10 is preferentially reacted with the gas component remaining in the vicinity of the brazing composite 30.

  The reaction area of the gas adsorption composite 10 (in FIG. 4, the total area of the gas adsorption layers 15 in the four gas adsorption composites 10) is based on the maximum width, maximum length, and maximum height of the brazed product. It is desirable that the surface area of the rectangular parallelepiped be greater than or equal to. This is because this is the minimum area in which the gas adsorbing composite material 10 can be disposed so as to surround the brazed products 30 and 14. By disposing the brazing composite material 30 so as to be surrounded by the gas adsorption composite material 10, the gas component in the vicinity of the brazing composite material 30 and the gas adsorption composite material 10 can be reacted efficiently. However, since this condition is appropriately changed according to the volume in the furnace and the residual concentration of the gas component, it is not a sufficient condition.

As shown in FIG. 4, the gas adsorbing composite material 10 and the brazed articles 30 and 14 are placed in a heat treatment furnace. The inside of the heat treatment furnace is a closed space where gas does not enter and exit, and is evacuated at a vacuum level lower than 5.0 × 10 ⁻² Pa. At this time, before raising the temperature to the brazing temperature for performing the actual brazing heat treatment, the temperature is lower than that by 20 ° C. to 50 ° C., preferably 25 ° C. to 40 ° C. higher than the melting point of the gas adsorbing composite material 10. (Pre-heat treatment temperature) is recommended to hold for a certain time. The holding time is 10 min to 20 min, preferably 15 min to 20 min. During this holding time, only the gas adsorption layer 15 in the gas adsorption composite material 10 is melted. After this pre-heat treatment is completed, the brazing material is melted by further heating to raise the brazing temperature, and the brazing heat treatment is completed by holding and cooling at the brazing temperature for a certain period of time. can get.

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

  The reason why the combination of the Ti layer 12 and the Ni layer 13 is used for the gas adsorption layer 15 of the gas adsorption composite material 10 is that Ti or Ti alloy first reacts more easily with oxygen and nitrogen than other elements. Can be mentioned. The reason why Ni or Ni alloy is combined with Ti or Ti alloy is that Ti and Ni are joined together, so that Ti atoms and Ni atoms are interdiffused during heating, and the alloy part formed thereby becomes Ni, Ti. It is because it melt | dissolves in melting | fusing point lower than the brazing | wax material part of the composite material 30 for brazing by falling from each melting | fusing point. The reason why the gas adsorbing layer 15 of the gas adsorbing composite material 10 is melted at a temperature lower than the melting point of the brazing filler metal portion in the brazing composite material 30 is that the Ti component is a gas component in the molten state than in the solid phase state. This is because the reactivity with (oxygen, nitrogen, carbon, etc.) increases.

  Since the gas adsorbing layer 15 of the gas adsorbing composite material 10 is melted at a lower temperature than the brazing material portion of the brazing composite material 30, the gas adsorbing layer 15 The reaction of the gas components remaining in the furnace proceeds further. As a result, most gas components are adsorbed and removed by the molten gas adsorption layer 15.

  Thereafter, the brazing material 30 is heated and heated to the brazing temperature to melt the brazing material portion, and a brazing heat treatment is performed. At this time, an impure gas component (reactivity with Ti is present in the furnace). Almost no high gas component) remains. Therefore, the gas component is not adsorbed on the molten brazing material portion, and good brazing is possible. Further, in the gas adsorbing composite material 10, since the base material 11 is formed to be sufficiently thick as compared with the gas adsorption layer 15, the molten gas adsorption layer 15 is held while adhering to the base material 11, cooled, The solidified gas adsorption layer 15 does not adhere to the hearth and the furnace wall.

As described above, the gas adsorbing composite material 10 is placed in the same heat treatment furnace as the brazing composite material 30, so that the brazing joint heat treatment can be performed at a vacuum level lower than 5.0 × 10 ⁻² Pa. Prior to the brazing material portion of the brazing composite material 30, the surface layer portion (gas adsorption layer 15) of the composite material 10 reacts with gas components such as oxygen and nitrogen remaining in the furnace, thereby Surface discoloration is suppressed, and the flow of brazing water is not impaired. As a result, a brazed product with good heat resistance and corrosion resistance of the brazed joint can be obtained without maintaining a vacuum higher than 5.0 × 10 ⁻² Pa during brazing heat treatment.

  The heat treatment method for brazing and bonding a composite material according to a preferred embodiment of the present invention is limited to a heat exchanger that is exposed to a highly corrosive gas or liquid at a high temperature, such as an EGR cooler. In addition, for example, it can be applied to various uses such as a fuel cell reformer cooler and a fuel cell member.

(Example 1)
Made of SUS304 (JIS standard), on the surface of a 2.5 mm thick stainless steel strip, in order from the stainless steel strip side, a 0.77 mm thick Ti strip, a 0.23 mm thick Ni strip Was laminated by a rolling method to produce a composite material having a laminated structure of Ni / Ti / SUS304 and a weight ratio of the Ti layer to the Ni / Ti layer of 63 mass% (plate thickness ratio of 77%).

Thereafter, the composite material was repeatedly rolled to produce a 1.0 mm composite material. The produced composite material was placed in a heat treatment furnace, and brazing evaluation described later was performed.
(Example 2)
A surface of the same stainless steel strip as in Example 1 is clad by rolling with a Ti strip having a thickness of 0.8 mm and a Ni strip having a thickness of 0.2 mm in order from the stainless steel strip side. Ni / Ti / SUS304, a composite material in which the weight ratio of the Ti layer to the Ni / Ti layer was 67 mass% (plate thickness ratio was 80%) was produced.

Thereafter, the composite material was repeatedly rolled to produce a 1.0 mm composite material. The produced composite material was placed in a heat treatment furnace, and brazing evaluation described later was performed.
(Comparative Example 1)
A surface of the same stainless steel strip as in Example 1 was clad by rolling with a Ti strip having a thickness of 0.83 mm and a Ni strip having a thickness of 0.17 mm in this order from the stainless steel strip side. Ni / Ti / SUS304, a composite material in which the weight ratio of the Ti layer to the Ni / Ti layer was 72 mass% (plate thickness ratio was 83%) was produced.

Thereafter, the composite material was repeatedly rolled to produce a 1.0 mm composite material. The produced composite material was placed in a heat treatment furnace, and brazing evaluation described later was performed.
(Comparative Example 2)
A surface of the same stainless steel strip as in Example 1 was clad by rolling with a Ti strip having a thickness of 0.89 mm and a Ni strip having a thickness of 0.11 mm in this order from the stainless steel strip side. Ni / Ti / SUS304, a composite material in which the weight ratio of the Ti layer to the Ni / Ti layer is 80 mass% (plate thickness ratio is 89%) was produced.

Thereafter, the composite material was repeatedly rolled to produce a 1.0 mm composite material. The produced composite material was placed in a heat treatment furnace, and brazing evaluation described later was performed.
(Comparative Example 3)
On the surface of the same stainless steel strip as in Example 1, in order from the stainless steel strip side, a Ti strip with a thickness of 0.66 mm and a Ni strip with a thickness of 0.34 mm are clad by a rolling method to form a laminated structure Ni / Ti / SUS304, a composite material in which the weight ratio of the Ti layer to the Ni / Ti layer is 50% (plate thickness ratio is 66%) was produced.

Thereafter, the composite material was repeatedly rolled to produce a 1.0 mm composite material. The produced composite material was placed in a heat treatment furnace, and brazing evaluation described later was performed.
(Comparative Example 4)
On the surface of the same stainless steel strip as in Example 1, in order from the stainless steel strip side, a Ti strip having a thickness of 0.59 mm and a Ni strip having a thickness of 0.41 mm are clad by a rolling method to form a laminated structure. Ni / Ti / SUS304, a composite material in which the weight ratio of the Ti layer to the Ni / Ti layer was 42 mass% (plate thickness ratio was 59%) was produced.

Thereafter, the composite material was repeatedly rolled to produce a 1.0 mm composite material. The produced composite material was placed in a heat treatment furnace, and brazing evaluation described later was performed.
(Conventional example)
A composite material to be placed in the heat treatment furnace was not produced (not used), and brazing evaluation described later was performed.

  Using the composite materials described in Examples 1 and 2, Comparative Examples 1 to 4, and the conventional example, a brazing test of the composite material for brazing was performed (the conventional example has no composite material). As a brazing composite material, it is made of SUS304 (JIS standard), and on the surface of a stainless steel strip having a thickness of 2.5 mm, a Ti strip having a thickness of 0.72 mm in order from the stainless steel strip side. A 0.6 mm Ni strip is clad by a rolling method, the laminated structure is Ni / Ti / SUS304, and the weight ratio of the Ti layer to the Ni / Ti layer is 38 mass% (plate thickness ratio is 39%). A material was prepared, and rolling was repeated on the material to produce a 1.0 mm brazing composite material.

  As shown in FIG. 3, the obtained brazing composite material 30 was cut into 40 mm × 50 mm, and a stainless steel pipe (diameter 10 mm × length 30 mm) 14 made of SUS304 was placed on the upper surface on the brazing layer side. Thereafter, as shown in FIG. 4, the composite material 10 (two pieces of 25 mm × 40 mm and two pieces of 25 mm × 50 mm) was placed up and down using a jig or the like on the front, rear, left and right of the brazing composite material 30. . At that time, the Ni surface of the gas adsorbing layer 15 in the composite material 10 was arranged toward the brazing composite material 30 side.

The brazing heat treatment was first held at 980 ° C. (pre-heat treatment temperature) for 15 min, then heated to 1200 ° C. (brazing temperature), heated to 15 min, and then cooled. The heat treatment atmosphere condition was 8.0 × 10 ⁻² Pa.

  Regarding the obtained brazed product (brazed joint of the brazing composite material 30 and the stainless steel pipe 14), evaluation of characteristics, specifically, discoloration state of the surface, fillet formation state (water flowability), and these A comprehensive evaluation of the characteristics was performed. The evaluation results of the brazing characteristics are shown in Table 1. In the evaluation, “Good” indicates “good” and “Poor” indicates “poor”.

  Here, the evaluation of the hot water flowability was performed by the fillet shape of the brazed joint of the obtained brazed product and the cross-sectional area of the fillet.

  As a result of the evaluation of the brazed product, the composite materials of Examples 1 and 2 both had good hot metal flowability and good fillet shape and amount. Moreover, there was little discoloration of the surface. Therefore, the overall evaluation was good.

  On the other hand, for the composite materials of Comparative Examples 1 to 4, since the melting point of the Ni / Ti layer of the composite material exceeds 1100 ° C., the Ni / Ti layer does not melt at the pre-heat treatment temperature of 980 ° C. It did not react sufficiently with the gas components of the atmospheric gas remaining in the furnace. Therefore, at a brazing temperature of 1200 ° C., the brazing filler metal part of the brazing composite material and the gas components in the furnace react preferentially, the surface of the brazing material is discolored, and the hot water flow is obstructed. Both shape and quantity were insufficient. From the above, the overall evaluation was poor.

  In the conventional example in which the brazing heat treatment was performed without using the composite material, the discoloration of the surface of the brazing material was remarkable, and the flowing property of the brazing metal was not sufficient. As a result, the overall evaluation was poor.

  As described above, according to the brazing joint method of the composite material for brazing according to the present invention in which the brazing joint is performed using the composite materials of Examples 1 and 2, the surface discoloration is small and the brazing metal flowability is good. From this, it can be seen that this is a brazing joint method with excellent brazing joint reliability.

It is sectional drawing of the composite material for gas adsorption | suction used for the brazing joining method which concerns on one preferred embodiment of this invention. It is a modification of FIG. It is a figure which shows the state which combined the composite material for brazing and the to-be-brazed material. It is a figure which shows the state which has arrange | positioned the gas adsorption composite material around the combination of FIG.

Explanation of symbols

10 Gas Adsorbing Composite Material 15 Gas Adsorbing Layer 30 Brazing Composite Material

Claims (11)

  In a method for brazing and joining a brazing composite material having a brazing material portion composed of a plurality of metal layers, the melting point is lower than that of the brazing composite material in the brazing heat treatment furnace in a closed space, and A gas adsorbing composite material having a gas adsorbing layer that is highly reactive with gas components such as oxygen and nitrogen in the atmosphere gas in the heat treatment furnace is disposed, and then the gas adsorbing layer is melted to form the gas in the gas adsorbing layer. A brazing and joining method for a brazing composite material, wherein components are adsorbed and removed, followed by brazing heat treatment to melt the brazing material portion and brazing.   Only the gas adsorption layer is melted and the brazing filler metal part is held at a temperature that does not melt for a predetermined time, the gas adsorption layer is melted and the gas component is adsorbed and removed by the gas adsorption layer, and then the brazing temperature is reached. The brazing and joining method for a brazing composite material according to claim 1, wherein the brazing heat treatment is performed by raising the temperature and the brazing material portion is melted to perform brazing.   3. The brazing composite material according to claim 1, wherein the gas adsorption composite material has a multilayer structure in which a gas adsorption layer composed of a Ti or Ti alloy layer and a Ni or Ni alloy layer is stacked on a substrate surface. Brazing joining method.   The brazing composite brazing material according to any one of claims 1 to 3, wherein a layer thickness ratio of the Ti layer to a sum of thicknesses of the Ti layer and the Ni layer of the gas adsorbing composite material is 70% or more and 82% or less. Bonding method.   The brazing material according to any one of claims 1 to 4, wherein the brazing composite material has a multilayer structure in which the brazing material portion composed of a Ti or Ti alloy layer and a Ni or Ni alloy layer is stacked on a substrate surface. Brazing method for composite materials.   The brazing composite brazing method according to any one of claims 1 to 5, wherein a layer thickness ratio of the Ti layer to a sum of thicknesses of the Ti layer and the Ni layer of the brazing composite material is 56% or less. .   The brazing / bonding method for a brazing composite material according to claim 1, wherein at least one of the Ti layer and the Ni layer constituting the gas adsorption layer of the gas adsorption composite material contains P. 8.   The brazing / bonding method for a brazing composite material according to claim 7, wherein the P concentration contained in the gas adsorption layer of the gas adsorption composite material is 0.02 to 10 wt%.   The Ti layer and the Ni layer constituting the gas adsorption layer of the gas adsorption composite material, wherein at least one layer includes at least one of Cu, Mn, Al, or Cr. A brazing and joining method for the brazing composite as described.   The brazing / bonding method for a brazing composite material according to claim 9, wherein the concentration of Cu contained in the gas adsorption layer of the gas adsorption composite material is 0.2 to 30 wt%. A brazed product obtained by brazing a brazing composite material and a member to be brazed by using the brazing composite brazing method according to claim 1.

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