JP2009248117A - Brazing sheet and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brazing sheet different from a conventional amorphous sheet or a conventional brazing filler metal paste. <P>SOLUTION: The brazing sheet comprises a first layer member Y formed of a first material, and a second layer member X1 formed of a second material and fixed to a surface on at least one side of the first layer member. The composition of a brazing filler metal is obtained at least by fusing the first and second materials. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a brazing sheet used when brazing members and a brazing member and a method for manufacturing the brazing sheet.

Conventionally, for example, when brazing and joining members made of metal, a method of brazing and joining members by placing a brazing sheet between the members and performing heat treatment has been used.
According to the brazing joining using this brazing sheet, the brazing sheet can be processed into an arbitrary shape and placed at a brazing location, so that partial brazing joining of members is preferably performed. It can be carried out.
As such a brazing sheet, an amorphous sheet produced by a rapid cooling method is used.

In addition, a brazing material paste containing a brazing material in a binder may be used for partial brazing joining between members.
According to the brazing joining using this brazing material paste, the members can be brazed and joined by applying the brazing material paste to an arbitrary part of the member and performing heat treatment.
Japanese Patent Laid-Open No. 5-261496 Japanese Patent No. 3953075 JP 2008-073738 A

However, the manufacturing process of the amorphous sheet is complicated, and the manufacturing cost is very high. For this reason, the cost of brazing joining will increase.
Further, since the brazing paste contains a binder, there is a problem that a part of the binder is carbonized and remains by heat treatment.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a brazing sheet different from conventional amorphous sheets and brazing pastes, and a method for producing the brazing sheet.

  In order to achieve the above object, a brazing sheet of the present invention includes a first layer member made of a first material, and a second layer made of a second material while being fixed to at least one surface of the first layer member. A two-layer member, wherein the first material and the second material are at least fused to form a brazing material composition.

  According to the brazing sheet of the present invention having such characteristics, the region where the first material forming the first layer member and the second material forming the second layer member are fused is at least a brazing material composition. It becomes.

  In the brazing sheet of the present invention, the first material is nickel, the first layer member is a nickel foil, and the second material is nickel contained in the first layer member from the brazing material composition. The configuration is made of the removed material.

  Moreover, in the brazing sheet of the present invention, a configuration is adopted in which the first layer member includes a through hole or an uneven portion.

  Next, in the method for producing a brazing sheet of the present invention, at least one surface of the sheet-like first layer member made of the first material is fused with at least the first material to form a brazing material composition. A pressure-bonding step of pressure-bonding the powder made of the second material, and a heat-treatment step of heat-treating the first layer member to which the powder is pressure-bonded in the pressure-bonding step.

  According to the method for manufacturing a brazing sheet of the present invention having such characteristics, the brazing material composition is obtained by fusing at least the first material with respect to the first layer member made of the first material in the crimping step. A powder made of the second material is pressed. Then, the first layer member to which the powder is pressure-bonded in the heat treatment process is heat-treated.

  In the method for manufacturing a brazing sheet of the present invention, in the heat treatment step, the first layer member is heat-treated at a temperature lower than the melting point of the first material and higher than the melting point of the second material. Is adopted.

  In the brazing sheet manufacturing method of the present invention, in the heat treatment step, the first layer member is heat-treated at a temperature lower than the melting point of the first material and the melting point of the second material. adopt.

  In the brazing sheet manufacturing method of the present invention, the first material is nickel, the first layer member is nickel foil, and the second material is contained in the first layer member from the brazing material composition. The structure is made of a material excluding nickel.

  Moreover, in the manufacturing method of the sheet | seat for brazing of this invention, the structure that the said 1st layer member is provided with a through-hole or an uneven | corrugated | grooved part is employ | adopted.

According to the brazing sheet of the present invention, the region where the first material forming the first layer member and the second material forming the second layer member are fused has at least a brazing material composition. For this reason, it becomes possible to perform brazing joining of members with a brazing sheet by performing heat treatment according to the melting point of the brazing material composition formed by fusing the first material and the second material. .
According to such a brazing sheet, by selecting the first material and the second material, it is not necessary to use an amorphous material or a paste material as the first material and the second material. In addition, a brazing sheet in which carbonized material is not generated by heating can be obtained.

Moreover, according to the manufacturing method of the brazing sheet of the present invention, the second material having the brazing material composition by being fused with at least the first material with respect to the first layer member made of the first material in the crimping step. The powder consisting of is pressed. Then, the first layer member to which the powder is pressure-bonded in the heat treatment process is heat-treated.
As a result, the brazing sheet of the present invention (that is, the first layer member made of the first material and at least one side of the first layer member) according to the heat treatment conditions (for example, time and temperature) in the heat treatment step. A brazing sheet having a second layer member made of a second material and fixed to the surface of the second material, or a fusion material of the first material and the second material (that is, a material having a brazing material composition). A brazing sheet can be produced.
In other words, according to the method for producing a brazing sheet of the present invention, it is possible to produce a brazing sheet that is inexpensive and has good workability and that does not generate a carbonized material by heating because it does not use a binder. It becomes.

  Hereinafter, an embodiment of a brazing sheet and a method for producing a brazing sheet according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

FIG. 1 is a perspective view of a brazing sheet S1 of the present embodiment. The brazing sheet S1 shown in FIG. 1 is obtained by cutting out a part of the brazing sheet S1 extending in a strip shape.
As shown in this figure, the brazing sheet S1 is made of a nickel foil Y made of nickel (first material) and a material obtained by removing nickel contained in the nickel foil Y from a desired brazing material composition (for example, Bni-5). (Fixed layer X1) which consists of (2nd material) and is fixed to the surface of one side of nickel foil Y. The thickness of the nickel foil Y can be arbitrarily set, but is set to about 10 to 50 μm, for example.
In such a brazing sheet S1, the material for forming the nickel foil Y is nickel, and the material for forming the fixing layer X1 is the nickel contained in the nickel foil Y from a desired brazing material composition (for example, Bni-5). Since the nickel foil Y and the fixing layer X1 are fused, a brazing material composition (for example, Bni-5) is obtained.

FIG. 2 shows a desired brazing material composition Bni-5 (a brazing material composition of nickel 71 wt%, chromium 19 wt%, and silicon 10 wt%), and a material for forming a nickel foil Y in a predetermined unit region (nickel foil itself). 6 is a table showing changes in the weight ratio of components in the material forming the fixed layer X1 when the weight ratio is changed.
As shown in this table, for example, when the nickel foil Y is 10 wt% of the brazing sheet S1 (Ni foil 10 wt%), the weight ratio of components in the material forming the fixing layer X1 is the entire fixing layer X1. Is 100 wt%, nickel (Ni) is 67.8 wt%, chromium (Cr) is 21.1 wt%, and silicon (Si) is 11.1 wt%. Then, as shown in FIG. 2, as the weight ratio of the nickel foil Y increases, the weight ratio of nickel in the material forming the fixing layer X1 decreases.

  As described above, since the material for forming the fixing layer X1 is a material obtained by removing the nickel contained in the nickel foil Y from the desired brazing material composition, as shown in FIG. 2, the weight ratio of the nickel foil Y increases. Accordingly, the nickel content of the material forming the pinned layer X1 is reduced.

As shown in FIG. 1, when the nickel foil Y is a flat sheet, the thickness of the nickel foil Y in the entire brazing sheet S1 changes in proportion to the required weight ratio of the nickel foil Y. .
However, in such a case, the thickness of the brazing sheet S1 is determined depending on the weight ratio of the nickel foil Y. On the other hand, the nickel foil Y having punch holes (through holes) shown in FIG. 3, the wire mesh nickel foil Y having a plurality of through regions (through holes) shown in FIG. 4, or the convex shown in FIG. By using the nickel foil Y on which the portion (uneven portion) is formed, the weight ratio of the nickel foil Y can be greatly changed while suppressing the change in the thickness of the nickel foil Y. Moreover, it may replace with a convex part and the recessed part may be formed.
Therefore, by suitably selecting, for example, a nickel foil processed as shown in FIGS. 3 to 5 as the nickel foil Y, the thickness of the brazing sheet S1 can be arbitrarily set.

In addition, as shown in FIG. 2, the weight ratio of the components in the material forming the fixed layer X <b> 1 changes according to the weight ratio of the nickel foil Y. However, depending on the weight ratio, it may be difficult to prepare a material for forming the optimum fixing layer X1.
As will be described in detail later, the fixing layer X1 is formed by pressing a powder made of a material forming the fixing layer X1 onto the nickel foil Y and heat-treating it. And depending on the weight ratio of the component in the material which forms the adhering layer X1, it may be difficult to press-bond to the nickel foil.
For this reason, when the thickness of the nickel foil Y cannot be changed, the brazing sheet S1 is processed as shown in FIGS. 3 to 5, and the nickel foil Y with respect to the brazing sheet S1 is processed. By changing the weight ratio, a material for forming the fixed layer X1 having a suitable weight ratio of the components can be used.
As an example, the nickel foil Y of Ni foil 50 wt% shown in FIG. 2, nickel (Ni) 58.6 wt%, chromium (Cr) 27.1 wt%, and silicon (Si) 14.3 wt%. When only the material for forming the fixing layer X1 is available, the material for forming the fixing layer X1 at hand can be used by forming punch holes in the nickel foil Y and reducing the weight ratio. it can.

The region including the interface between the nickel foil Y and the fixing layer X1 has a brazing material composition by fusing nickel and a material excluding nickel contained in the nickel foil Y from a desired brazing material composition.
For this reason, the region including the interface between the nickel foil Y and the fixing layer X1 of the brazing sheet S1 is melted by being heated to the melting point temperature or higher of the brazing material composition. And when the area | region containing the interface of nickel foil Y and the fixed layer X1 fuse | melts, the circumference | surroundings will also fuse | melt. For this reason, the brazing sheet S1 can be used for brazing by heating at a temperature equal to or higher than the melting point of the brazing material composition formed by fusing the nickel foil Y and the fixing layer X1. In other words, even when the melting point of the nickel foil Y and the fixing layer X1 is higher than the melting point of the brazing material composition, the brazing sheet S1 is melted and brazed and bonded to the melting point of the brazing material composition. It can be performed.

According to the brazing sheet S1 of the present embodiment having such a configuration, a region (nickel foil Y and fixing layer) in which nickel, which is a material forming the nickel foil Y, and a material forming the fixing layer X1 are fused. The region including the interface with X1) has at least a brazing material composition. For this reason, it becomes possible to perform brazing joining of members with the brazing sheet by performing the heat treatment reaching the melting point of the brazing material composition.
According to such a brazing sheet, as described above, nickel is selected as the material for forming the nickel foil Y, and the nickel contained in the nickel foil Y from the desired brazing material composition is used as the material for forming the fixing layer X1. The excluded material was selected. Accordingly, it is not necessary to use an amorphous material or a paste material for the brazing sheet, so that the brazing sheet is inexpensive and has good workability and further does not generate carbonized material by heating.

  The brazing sheet S1 of the present embodiment can be suitably used, for example, when a member carrying a catalyst is brazed to an installation location.

Next, a method for manufacturing a brazing sheet according to this embodiment will be described with reference to FIG.
FIG. 6 is a schematic configuration diagram of a brazing sheet manufacturing apparatus D1. As shown in this figure, the manufacturing apparatus D1 includes a hopper 1, a belt feeder 2, a rolling roller 3, a pulley 4, a heating furnace 5, and a collection roller 6.

  The hopper 1 is configured to receive the powder X made of the material forming the fixing layer X <b> 1 and supply the powder X to the belt feeder 2.

  The belt feeder 2 is configured to supply the powder X to the peripheral surface of the rolling roller 3 (the peripheral surface of a rolling roller 3A described later) by conveying the powder X and dropping the powder X downward from above the rolling roller 3. It has become.

The rolling roller 3 includes a pair of rolling rollers 3A and a rolling roller 3B. The rolling roller 3 </ b> A is arranged so as to be positioned below the belt feeder 2. The rolling roller 3 is rotationally driven by a rotation driving mechanism (not shown), whereby the powder X supplied via the belt feeder 2 and the nickel foil Y inserted from above are transferred to the rolling roller 3A and the rolling roller 3B. It becomes the structure rolled between.
The rolling roller 3 press-bonds the nickel foil Y and the powder X between the rolling rollers 3A and 3B, thereby forming a powder layer made of the powder X on one surface of the nickel foil Y.

  The pulley 4 is disposed below the rolling roller 3, and is configured to guide the nickel foil Y in which the powder X is pressure-bonded to one surface by the rolling roller 3 in the horizontal direction.

  The heating furnace 5 sinters the powder X by heating the powder X arranged on one surface together with the nickel foil Y at a temperature lower than the melting point of the nickel foil Y and the melting point of the powder X. As a result, the powder layer (layer consisting of the powder X) on one side of the nickel foil Y is sintered, and then cooled to form the fixed layer X1 having the brazing material composition.

  The collection roller 6 collects the nickel foil Y (that is, the brazing sheet) discharged from the heating furnace 5 by winding it.

In such a manufacturing apparatus D1, the powder X accommodated in the hopper 1 is supplied to the peripheral surface of the rolling roller 3A by the belt feeder 2.
The powder X supplied to the peripheral surface of the rolling roller 3A is supplied between the rolling rollers 3A and 3B by the rotational drive of the rolling roller 3A, and is inserted between the rolling rollers 3A and 3B from below to be conveyed. The nickel foil Y is pressed and disposed on one surface of the nickel foil Y (crimping step).

The nickel foil Y to which the powder X is pressure-bonded is inserted into the heating furnace 5 positioned below the rolling rollers 3A and 3B via the pulley 4 and subjected to heat treatment (heat treatment step).
And in this embodiment, when heating nickel foil Y, it heats at temperature lower than melting | fusing point of nickel foil Y and melting | fusing point of powder X, and makes the heating time short. As a result, the powder X is sintered to form the fixed layer X1.

  Then, the nickel foil Y (that is, the brazing sheet) on which the fixing layer X1 is formed is collected by being wound by the collecting roller 6.

  According to the method for manufacturing a brazing sheet of the present embodiment as described above, the brazing sheet S1 in which the fixing layer X1 is formed on one surface of the nickel foil Y can be manufactured.

  As mentioned above, although preferred embodiment of the manufacturing method of the sheet | seat for brazing and the sheet | seat for brazing concerning this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above embodiment, the configuration in which the brazing sheet has the composition of Bni-5 as a whole has been described with reference to FIG.
However, the present invention is not limited to this, and the brazing sheet may have a composition of Bni-1 to 7 as a whole.
Even in such a case, the weight ratio of the component of the material forming the fixing layer X1 is obtained by removing the nickel contained in the nickel foil Y from the brazing material composition required for the brazing sheet.

Further, the brazing sheet is not limited to a nickel brazing material (Bni-1 to 7) as a whole, but a phosphor copper brazing material (BcuP-1, 2), an aluminum brazing material (BAlSi) or a magnesium brazing material (BMg). ).
For example, when the brazing sheet has a phosphor copper brazing material composition as a whole, a copper foil is used instead of the nickel foil, and the copper foil is included from the phosphor copper brazing material composition as a material for forming the fixing layer. A material excluding copper is used.
For example, when the brazing sheet has an aluminum brazing material composition as a whole, an aluminum foil is used instead of the nickel foil, and the aluminum contained in the aluminum foil is used as a material for forming the fixing layer from the aluminum brazing material composition. The removed material will be used.
Further, for example, when the brazing sheet has a magnesium brazing material composition as a whole, a magnesium foil is used instead of the nickel foil, and the magnesium contained in the magnesium foil from the magnesium brazing material composition is used as a material for forming the fixing layer. The removed material will be used.

Moreover, in the said embodiment, the structure by which the fixed layer X1 was formed only in the surface of one side of nickel foil Y was demonstrated.
However, the present invention is not limited to this, and fixed layers may be formed on both surfaces of the nickel foil Y, respectively. In this case, the thickness of each fixing layer is set so that the total thickness becomes the thickness of the fixing layer X1 of the above embodiment.

Moreover, in the said embodiment, the structure which heat-processes continuously the nickel foil by which the powder was crimped | bonded by the rolling roller was demonstrated.
However, this invention is not limited to this, For example, you may employ | adopt the structure which cut | disconnects the nickel foil in which the powder was crimped | bonded with the rolling roller, and heat-processed separately in a batch furnace (vacuum furnace).

Moreover, you may perform separately the process of forming nickel foil Y as one process of the manufacturing method of the sheet | seat for brazing.
In such a case, the nickel foil Y can be formed by rolling a nickel plate, or the nickel foil Y can be formed by rolling nickel powder.
And you may perform the process of processing the nickel foil Y further as needed.

Moreover, in the said embodiment, the structure which heats with respect to the nickel foil with which powder was crimped | bonded at temperature lower than melting | fusing point of nickel foil Y and melting | fusing point of powder X, and shortened the heating time was demonstrated.
However, the present invention is not limited to this, and the heat treatment may be performed at a temperature lower than the melting point of the nickel foil Y and higher than the melting point of the powder X. Further, the heating time may be long.
However, in such a case, the fusion of the nickel foil Y and the powder X (material for forming the fixing layer) proceeds, and a brazing sheet consisting only of the brazing material composition is manufactured.
Similar to the brazing sheet of the above-described embodiment, the brazing sheet having only such a brazing material composition is inexpensive and has good workability, and further becomes a brazing sheet in which no carbonized material is generated by heating. .

It is a perspective view of the sheet | seat for brazing which is one Embodiment of this invention. It is the table | surface which showed the change of the weight ratio of the component in the material which forms the adhering layer X1, when changing the weight ratio of nickel foil in the brazing sheet which is one Embodiment of this invention. It is a perspective view which shows the modification of the nickel foil which the sheet | seat for brazing which is one Embodiment of this invention has. It is a top view which shows the modification of the nickel foil which the sheet | seat for brazing which is one Embodiment of this invention has. It is a perspective view which shows the modification of the nickel foil which the sheet | seat for brazing which is one Embodiment of this invention has. It is the figure which showed typically schematic structure of the manufacturing apparatus which manufactures the sheet | seat for brazing which is one Embodiment of this invention.

Explanation of symbols

  S1 ... Brazing sheet, Y ... Nickel foil (first layer member), X1 ... Adhesive layer (second layer member)

Claims (8)

  A first layer member made of a first material; and a second layer member made of a second material and fixed to at least one surface of the first layer member; the first material and the second material; Is a brazing sheet composition that is at least fused to form a brazing material composition.   The first material is nickel, the first layer member is nickel foil, and the second material is a material obtained by removing the nickel contained in the first layer member from the brazing material composition. The brazing sheet according to 1.   The brazing sheet according to claim 1, wherein the first layer member has a through hole or an uneven portion. A pressure-bonding step for pressure-bonding a powder made of a second material that becomes a brazing material composition by fusing with at least the first material to at least one surface of the sheet-like first layer member made of the first material;
And a heat treatment step of heat-treating the first layer member to which the powder has been pressure-bonded in the pressure-bonding step.   5. The method for manufacturing a brazing sheet according to claim 4, wherein, in the heat treatment step, the first layer member is heat-treated at a temperature lower than the melting point of the first material and higher than the melting point of the second material. .   5. The method for manufacturing a brazing sheet according to claim 4, wherein, in the heat treatment step, the first layer member is heat-treated at a temperature lower than a melting point of the first material and a melting point of the second material.   The first material is nickel, the first layer member is nickel foil, and the second material is a material obtained by removing the nickel contained in the first layer member from the brazing material composition. The manufacturing method of the sheet | seat for brazing in any one of 4-6. The method for manufacturing a brazing sheet according to any one of claims 4 to 7, wherein the first layer member includes a through hole or an uneven portion.

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