JP2004025251A - Brazing material composite plate, method for producing the same, and heat exchanger using the same - Google Patents

Abstract

An object of the present invention is to provide an easy-to-use brazing material composite board by improving workability of brazing.
Kind Code: A1 A powder having a brazing material component containing nickel as a main component is fixed on both surfaces of a metal plate made of stainless steel or a heat-resistant alloy as a base material by, for example, powder rolling, and then sintered to form a base material. The material layers 2A and 2B are formed. Used for heat exchangers.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a brazing filler metal composite plate comprising a base material and a brazing filler metal, a method for producing the same, and a heat exchanger using the same.
[0002]
[Prior art]
As is well known, the use of the brazing filler metal is diversified. For example, in a heat exchanger, a nickel brazing filler metal containing nickel (Ni) as a main component is used for joining a SUS plate (heat-resistant metal) serving as a base material. . As the nickel brazing material, the following two types are in practical use. That is, one is a powder of a nickel-based alloy, which is kneaded with a binder into a paste when used, and is applied to a joint. The other is an amorphous sheet formed by quenching a nickel-based alloy, and in use, a sheet cut into a predetermined shape is interposed at a joint. Such a nickel brazing material has a melting point of about 1000 ° C., and the SUS plate is joined by heating to a temperature exceeding the melting point.
[0003]
[Problems to be solved by the invention]
Incidentally, of the two types of nickel brazing materials, the former powdery material needs to be made into a paste, and a preheating step is necessary to volatilize the binder in a stage before joining, which is inconvenient. At the same time, residual carbon may remain, causing quality deterioration. On the other hand, the latter nickel sheet material in the form of amorphous sheet does not use a paste, so there is no problem of residual carbon.However, since it is cut into a predetermined shape and inserted into the joint, it has many joints like a heat exchanger. In some cases, it is necessary to spread the cut pieces at the respective joints, and therefore, the workability is also poor and the usability is poor.
[0004]
The present invention has been made in view of the above-described problems, and provides a brazing material composite plate that is easy to use by improving the workability of brazing, and a method for manufacturing such a brazing material composite plate and a method for manufacturing the same. The purpose is to provide the used heat exchanger.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs, as a first means relating to a brazing material composite plate, a structure in which a powder having a brazing material composition is fixed to at least one surface of the plate material.
[0006]
As a second means relating to the brazing material composite plate, a configuration is adopted in which the powder having the brazing material composition is a powder containing nickel as a main component in the first means.
[0007]
As a third means relating to the brazing material composite plate, in the above-mentioned first or second means, a configuration is adopted in which the plate material is a heat-resistant alloy containing SUS or nickel.
[0008]
Further, in the present invention, as a first means relating to a method of manufacturing a brazing material composite plate, the method of manufacturing a brazing material composite plate according to any one of the first to third aspects, wherein one or both surfaces of the plate material are brazed. A configuration is adopted in which a powder having a material composition is fixed by a powder rolling method.
[0009]
As a second means relating to a method of manufacturing a brazing material composite board, in the above-mentioned first means, after fixing a powder having a brazing material composition to a plate material, the powder having the brazing material is sintered by heating. Adopt configuration.
[0010]
Further, in the present invention, as the first means relating to the heat exchanger using the brazing material composite plate, a configuration using the brazing material composite plate according to any of the above first to third aspects is adopted.
[0011]
As a second means related to a heat exchanger using a brazing material composite plate, a configuration is used in which a brazing material composite plate is used for one or both of a corrugated plate and a flat plate, and the laminate is alternately laminated and brazed. adopt.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a brazing filler metal composite board, a method of manufacturing the same, and a heat exchanger using the same according to the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 is a perspective view (including a partially enlarged view) of a brazing material composite plate in the present embodiment. As can be easily understood from FIG. 1, the brazing material composite plate A has a brazing material layer 2A, 2B formed on both surfaces of a metal plate 1 as a base material. The metal plate 1 is a heat-resistant alloy containing SUS (stainless steel) or nickel. The brazing material layers 2A and 2B are nickel brazing materials containing nickel as a main component. The brazing material composite plate A is used as a constituent material of the heat exchanger.
[0014]
FIG. 2 is a schematic diagram of an apparatus for manufacturing such a brazing material composite board A (a brazing material composite board manufacturing apparatus). In FIG. 2, reference numeral 3 denotes a brazing material powder, 4A and 4B denote rolling rollers, 5A and 5B denote powder feeding belt feeders, and 6 denotes a heating furnace. A pair of provided rolling rollers 4A and 4B are arranged such that their peripheral surfaces face each other at a predetermined interval in parallel, and the metal plate 1 is interposed therebetween from above to below. It has become.
[0015]
Further, powder feed belt feeders 5A and 5B are arranged at predetermined intervals on such rolling rollers 4A and 4B, respectively. One powder feed belt feeder 5A is arranged above one rolling roller 4A, and supplies the brazing material powder 3 onto the peripheral surface of the rolling roller 4A. The other powder feed belt feeder 5B is disposed above the other rolling roller 4B, and supplies the brazing material powder 3 onto the peripheral surface of the rolling roller 4B.
[0016]
The brazing filler metal powder 3 is a powder having a nickel brazing filler metal composition, and is supplied from the hopper onto the powder delivery belt feeder 5A and the powder delivery belt feeder 5B, respectively. The brazing material powder 3 is sequentially supplied onto the respective peripheral surfaces of the rolling rollers 4A and 4B by operating the powder feeding belt feeders 5A and 5B.
[0017]
Then, the brazing material powder 3 sent onto the peripheral surfaces of the rolling rollers 4A and 4B is rolled and fixed to each surface of the metal plate 1 by further rotation of the rolling rollers 4A and 4B. The metal plate 1 in a state where the brazing material powder 3 is fixed on both surfaces is inserted into a heating furnace 6 located below the rolling rollers 4A and 4B so that the brazing material powder 3 is not melted. It is heated to a temperature lower than the melting point, and as a result, the brazing material powder 3 is sintered and firmly fixed to each surface of the metal plate 1. What is sent out from the heating furnace 6 in this way is the brazing material composite plate A.
[0018]
Next, a heat exchanger using the brazing material composite plate A thus manufactured will be described with reference to FIG. In FIG. 3, reference numeral A1 is a brazing material composite flat plate obtained by cutting the brazing material composite plate A into a predetermined size, and A2 is a brazing material composite corrugated plate formed into a corrugated sheet.
[0019]
As shown in this figure, the present heat exchanger is configured by alternately stacking brazing material composite flat plates A1 and brazing material composite corrugated plates A2. That is, in a state where the brazing material composite flat plate A1 and the brazing material composite corrugated plate A2 are alternately laminated, the brazing material composite flat plate A1 and the brazing material composite corrugated plate are heated to a temperature exceeding the melting point of the nickel brazing material. The brazing material layers 2A and 2B (nickel brazing material) on each surface of A2 are melted, and the respective contact portions are brazed.
[0020]
According to the present embodiment, since the brazing material composite plate A is configured such that the brazing material layers 2A and 2B are formed on both surfaces of the metal plate 1 in advance, the brazing material paste is applied or the brazing material sheet is formed. The brazing material composite flat plate A1 and the brazing material composite corrugated sheet A2 are stacked and placed in the heating furnace 6 without being sandwiched, and are easily joined only by heating to a temperature exceeding the melting point of the nickel brazing material by several tens degrees. can do. That is, the usability is extremely good as compared with the conventional nickel brazing material, and the workability in joining can be greatly improved.
[0021]
Note that the present invention is not limited to the above embodiment, and for example, the following modified examples can be considered.
(1) In the above embodiment, the brazing material layers 2A and 2B are formed on both surfaces of the metal plate 1, but the brazing material layers may be formed on only one surface.
[0022]
(2) In the above embodiment, the uniform brazing material layers 2A and 2B are formed on both surfaces of the metal plate 1 over the entire surface. However, the portions that actually contribute to the joining of the brazing material layers 2A and 2B are the contact portions of each other. is there. That is, portions that do not contact do not contribute to joining at all. In consideration of such circumstances, instead of forming a uniform brazing material layer on the entire surface of the metal plate 1, the brazing material layer is formed on the surface of the metal plate 1 in a striped, lattice, or dot shape at a predetermined interval. You may do it.
[0023]
(3) In the above-mentioned brazing filler metal composite board manufacturing apparatus, the brazing filler powder 3 is delivered using the powder delivery belt feeders 5A and 5B. Is also good. For example, a screw feeder or a roll feeder may be used instead of the powder feed belt feeders 5A and 5B.
[0024]
(4) The above-mentioned brazing filler metal powder 3 is a powder having a nickel brazing filler metal composition, but is not limited to a single kind of powder, and a plurality of kinds of powders different in composition from the nickel brazing filler metal are mixed and mixed. The synthetic component of the powder may be a powder having a nickel brazing material composition.
[0025]
For example, in the case of JIS standard BNi-2, nickel (Ni) powder, nickel-chromium (Ni-Cr) alloy powder, nickel-boron (Ni-B) alloy powder, and iron-chromium (Fe-Cr) alloy powder And iron-nickel (Fe-Ni) alloy powder and iron-silicon (Fe-Si) alloy powder are mixed, and the total component ratio of the total is nickel (Ni) as a base material component and chromium (Cr) is 6 wt. % Or more and 8 wt% or less, boron (B) is 2.75 wt% or more and 3.5 wt% or less, iron (Fe) is 2.5 wt% or more and 3.5 wt% or less, silicon (Si) is 4 wt% or more and The mixture prepared so as to have a concentration of 5 wt% or less is formed into a green sheet by a powder rolling method, and sintered in a heating furnace. The sintered sheet of such a mixed powder does not locally have a nickel brazing material composition, but can be brazed as a brazing material by melting. The particle size of each of these powders is preferably 100 μm or less.
[0026]
(5) The heat exchanger is formed by alternately laminating the brazing material composite flat plate A1 and the brazing material composite corrugated plate A2, but either one of them may be a simple metal plate. That is, if one of the two is a brazing material composite plate, the contact portion between the two can be brazed.
[0027]
【The invention's effect】
As described above, according to the present invention, since the brazing material is fixed to at least one surface of the plate material, it is extremely easy to use as compared with overcoming the disadvantages of the conventional nickel brazing material, and the workability in joining is greatly improved. Can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a brazing material composite plate A according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing a configuration of a brazing material composite board manufacturing apparatus according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a configuration of a heat exchanger according to one embodiment of the present invention.
[Explanation of symbols]
A brazing material composite plate 1 metal plate 2A, 2B brazing material layer 3 brazing material powder 4A, 4B rolling rollers 5A, 5B powder feeding belt feeder 6 heating furnace

Claims (7)

A brazing material composite plate comprising a powder having a brazing material composition adhered to at least one surface of the plate material. The brazing material composite board according to claim 1, wherein the powder having a brazing material composition is a powder containing nickel as a main component. 3. The brazing material composite plate according to claim 1, wherein the plate material is a heat-resistant alloy containing SUS or nickel. It is a manufacturing method of the brazing material composite board according to any one of claims 1 to 3,
A method for producing a brazing material composite plate, comprising: fixing powder having a brazing material composition to one or both surfaces of a plate material by a powder rolling method. 5. The method for producing a brazing material composite board according to claim 4, wherein after the powder having the brazing material composition is fixed to the plate material, the powder having the brazing material is sintered by heating. A heat exchanger using the brazing material composite plate according to claim 1. A heat exchanger using a brazing material composite plate, characterized in that a brazing material composite plate is used for one or both of a corrugated plate and a flat plate, and is alternately laminated and brazed.

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