JP2009215574A - Method for producing laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a laminate which has a film having superior bonding strength to a substrate compared to a conventional laminate obtained by a cold spray method. <P>SOLUTION: The method for producing the laminate having a film formed on the surface of the substrate with the cold spray method includes: a substrate treatment step of previously activating the surface of the substrate; and a film-forming step of forming the film on the surface of the substrate after the substrate treatment step. The production method can avoid energy necessary for the plastic deformation of a powder from being used for activating the surface of the substrate, when forming the film on the surface of the substrate by plastic-deforming the powder in the film-forming step. As a result, the powder is efficiently plastic-deformed on the surface of the substrate and forms the film having superior bonding strength to the substrate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a laminate in which a film is formed on the surface of a substrate by a cold spray method.

Conventionally, a method of forming a film on the surface of a substrate by a cold spray method is known (see, for example, Patent Document 1 and Patent Document 2). In this method, the powder of the coating material is caused to collide with the surface of the substrate by entraining the powder of the coating material in a gas flowing at supersonic speed set to a temperature lower than the melting point or softening point of the coating material. In this method, when the powder collides with the surface of the substrate at a high speed, a film is formed by plastic deformation of the powder particles in the solid state. According to such a cold spray method, it is possible to form a dense film with a dense structure on the surface of the substrate.
JP 2006-179856 A US Pat. No. 5,302,414

  By the way, the laminate obtained by the cold spray method is partly used as a metal part in various industrial equipment and general equipment. In recent years, the efficiency of these devices has been further improved, and the metal parts to be used are used under severe conditions. Therefore, even in a laminate obtained by the cold spray method, further improvement in the bonding strength between the base material and the film is desired.

  Then, the subject of this invention is providing the manufacturing method of the laminated body which is excellent in the joining strength of the film | membrane with respect to a base material compared with the conventional laminated body obtained by the cold spray method.

The present invention that solves the above problems is a method for manufacturing a laminate in which a film is formed on the surface of a base material by a cold spray method, a base material processing step that activates the surface of the base material in advance, and the base material processing step And a film forming step of forming the film on the surface of the substrate by a cold spray method.
Moreover, in such a manufacturing method, it is desirable that the base material treatment step is a step of activating the surface of the base material by spraying powder onto the surface of the base material by a cold spray method.
Moreover, in such a manufacturing method, it is comprised so that the speed | rate of the said powder sprayed on the said base material in the said base-material process process may become lower than the speed of the said powder sprayed on the said base material in the said film formation process. can do.
Moreover, in such a manufacturing method, it is desirable that the powder used in the cold spray method is made of a quasicrystalline dispersed aluminum alloy or an amorphous dispersed alloy.

  ADVANTAGE OF THE INVENTION According to this invention, compared with the conventional laminated body obtained by the cold spray method, the manufacturing method of the laminated body which is excellent in the joining strength of the film | membrane with respect to a base material can be provided.

  Hereinafter, embodiments of the present invention will be described in detail. In the drawings referred to here, FIG. 1 is a partial cross-sectional view of a laminate obtained by the manufacturing method according to the embodiment.

  As shown in FIG. 1, the laminated body 1 obtained by the manufacturing method of this embodiment has a film 3 formed on the surface of a substrate 2 by a cold spray method described later.

  The substrate 2 is not particularly limited as long as the coating 3 can be laminated on the surface thereof, and can be any metal or non-metal such as aluminum, magnesium, iron, titanium, stainless steel. , Ceramics, glass, wood and the like. Among them, those containing aluminum and magnesium are desirable, and aluminum alloys are particularly desirable.

What is necessary is just to select suitably as the said film | membrane 3 according to the function provided to the surface of the base material 2, for example, an aluminum alloy, a magnesium alloy, a gallium alloy, a palladium alloy, a titanium alloy, a chromium alloy, a vanadium alloy etc. are mentioned. It is done. The coating 3 can be selected according to the material of the substrate 2. For example, the coating 3 formed on the surface of the substrate 2 made of an aluminum alloy is preferably made of an aluminum alloy. An aluminum alloy or an amorphous dispersed aluminum alloy is desirable. Incidentally, the matrix of the quasicrystalline dispersed aluminum alloy and the amorphous dispersed aluminum alloy is desirably an aluminum crystal phase or an aluminum supersaturated solid solution phase.
The thickness of the film 3 can be changed as appropriate, but is preferably 1 μm or more, more preferably 10 μm or more, and even more preferably 100 μm or more. Moreover, the thickness of the film 3 can be 5 mm or more.

  Next, the manufacturing method of the laminated body 1 is demonstrated. Drawing 2 (a) referred here is process explanatory drawing explaining a mode that a layered product is manufactured with a manufacturing method concerning an embodiment, and is a figure showing a substrate treatment process, and Drawing 2 (b) is a figure. FIG. 3 is a partially enlarged view of the surface of the substrate in FIG. FIG. 3 is a graph showing the relationship between the time until the powder can be deposited on the substrate (deposition required time) and the speed of the powder colliding with the substrate, and the vertical axis indicates the necessary deposition time [seconds]. The horizontal axis represents the powder speed [m / sec]. Fig.4 (a) is process explanatory drawing explaining a mode that a laminated body is manufactured with the manufacturing method which concerns on embodiment, Comprising: It is a figure which shows a membrane | film | coat formation process, FIG.4 (b) is FIG. It is the elements on larger scale of the surface of the base material in). FIG. 5 is a time chart of the substrate processing step and the film forming step in the manufacturing method according to the embodiment, where the vertical axis represents the pressure [MPa] of gas supplied to the Laval nozzle, and the horizontal axis represents the injection time of the Laval nozzle [ Represents seconds.

  The method of manufacturing the laminate 1 shown in FIG. 1 is to form a film 3 by spraying a powder, which will be described later, onto the surface of the substrate 2 by a cold spray method. The main feature is to activate the surface of. That is, this manufacturing method includes a base material processing step for activating the surface of the base material 2 in advance and a film forming step for forming the film 3 on the surface of the base material 2.

  In the base material processing step, as described above, the surface of the base material 2 is activated. Factors for activating the surface of the substrate 2 include properties such as the presence of an oxide film on the surface of the substrate 2, the surface smoothness (surface roughness) of the substrate 2, and the surface of the substrate 2 The temperature, the hardness of the surface of the substrate 2 and the like can be mentioned. Then, “activation” of the surface of the base material 2 means that such a factor is controlled so that the powder particles colliding with the base material 2 are efficiently plastically deformed to easily form the coating 3. .

Specific examples of the method for activating the surface of the substrate 2 include a chemical polishing method, a mechanical polishing method, an electrolytic polishing method, an ion etching method, a shot peening method, a blasting method, and a cold spray method. These methods may be used singly or in combination as appropriate.
Among these activation methods, the cold spray method is desirable, and in the following description, the method for manufacturing the laminate 1 using the cold spray method as the activation method will be described in more detail.

  In the base material processing step using the cold spray method shown in FIG. 2A, the speed V1 of the powder 4 sprayed onto the base material 2 is the speed V2 of the powder 4 sprayed onto the base material 2 in the film forming step described later ( It is set to be lower than that shown in FIG.

  As shown in FIG. 2A, in the cold spray method according to the present embodiment, the powder 4 and the gas 5 are supplied to the Laval nozzle 100, whereby the gas 5 is accelerated and the accelerated gas 5 has the powder 4. Is accompanied.

  The powder 4 may be made of a material constituting the coating 3, and specifically, as described above, is preferably made of an aluminum alloy. Among them, a quasicrystalline dispersed aluminum alloy or an amorphous dispersed aluminum alloy is preferable. desirable.

  The particle size of the powder 4 is, for example, 200 μm or less, more preferably 150 μm or less in the case of the powder 4 made of an aluminum alloy. The average particle size is preferably 0.1 to 50 μm.

Examples of the gas 5 include helium, nitrogen, air, and the like. Among these, helium is desirable. The pressure of the gas 5 supplied to the Laval nozzle 100 is adjusted according to the speed of the powder 4 described later.
The temperature of the gas 5 supplied to the Laval nozzle 100 is set to a temperature lower than the melting point or softening point of the aluminum alloy used.

  In this base material processing step, the powder 4 injected together with the gas 5 from the Laval nozzle 100 collides with the surface of the base material 2. As a result, the surface of the substrate 2 is activated. That is, when an oxide film is present on the surface of the substrate 2, the oxide film is removed. When the surface of the substrate 2 is too smooth, the surface is roughened, If the temperature is too low, the surface is heated, and if the surface hardness is too high, the surface of the substrate 2 is activated by decreasing the hardness by raising the temperature or the like.

In this substrate processing step, it is desirable to activate the surface of the substrate 2 without depositing the powder 4 on the surface of the substrate 2 as shown in FIG.
Here, referring to FIG. 3, the time until the powder 4 can be deposited on the surface of the base material 2 (necessary time for deposition) and the speed of the powder 4 colliding with the base material 2 The relationship with “powder speed” is omitted. As shown in FIG. 3, when the “powder speed” is in the range of 0 [m / sec] to Va [m / sec] (area 1 in FIG. 3), the “powder speed” is insufficient. The powder 4 is not deposited on the surface of the substrate 2. This region 1 is a region where the plastic deformability of the powder 4 is insufficient.

  If the “powder velocity” exceeds Va [m / sec] and is less than Vb [m / sec] (region 2 in FIG. 3), the powder 4 Are not deposited to form the film 3. Further, in the region 2, the powder 4 is deposited on the surface of the substrate 2 within a range that is equal to or longer than the required deposition time indicated by the curve L.

  On the other hand, in the range where the “powder speed” is Vb [m / sec] or more (region 3 in FIG. 3), the powder 4 immediately deposits on the surface of the base material 2. In some cases, the surface of the substrate 2 is not activated to the extent that the bonding strength of 3 is sufficient, or the formation efficiency of the coating 3 may be reduced by erosion.

  Therefore, as described above, in order to activate the surface of the substrate 2 without depositing the powder 4 on the surface of the substrate 2, the “powder speed” exceeds Va [m / sec] and Vb [m / sec] It is desirable to set the spraying time of the powder 4 on the surface of the substrate 2 to a time that is less than the required deposition time indicated by the curve L, while setting it to a range less than m / second] (region 2).

Next, the film forming process shown in FIG. In this film forming step, the speed of the gas 5 that entrains the powder 4 is set to a speed V2 at which the particles of the powder 4 that collide with the substrate 2 can be plastically deformed. That is, the speed V2 is set to a speed that is equal to or higher than the critical speed and exceeds the speed V1 (see FIG. 2A).
In this film formation step, as shown in FIG. 4B, the particles of the powder 4 colliding with the base material 2 are plastically deformed to form the film 3.

  Incidentally, the velocity (Ug) of the gas 5 is generally defined by the following equation (1).

  However, in Formula (1), Ugi represents the gas velocity at the inlet of the Laval nozzle 100, Pi represents the pressure of the gas at the inlet of the Laval nozzle 100, Ti represents the temperature of the gas at the inlet of the Laval nozzle 100, R represents the gas constant of the gas 5, and κ represents the specific heat ratio of the gas 5.

As shown in this equation (1), the speed (Ug) of the gas 5 entrained with the powder 4 is adjusted by changing at least one of the temperature Ti of the gas 5 and the pressure Pi of the gas 5 supplied to the Laval nozzle 100. can do.
That is, in the manufacturing method according to the present embodiment, as shown in FIG. 5, first, the base material processing step is performed by supplying the gas 5 to the Laval nozzle 100 at “gas pressure P1” from time t1 to time t2. After that, the above-described film forming step is performed by supplying the gas 5 to the Laval nozzle 100 at a “gas pressure P2” higher than the “gas pressure P1”. Incidentally, it is desirable to set the time (t2-t1) of the substrate processing step within the above-described region 2 shown in FIG. 3 and less than the required deposition time indicated by the curve L. It is desirable to set this time so that the critical surface state of whether or not the powder 4 is deposited on the surface of the substrate 2 is obtained.

  In the manufacturing method of the laminated body 1 as described above, the powder 4 collides with the accelerated gas 5 and collides with the base material 2 at a high speed by using the cold spray method. As a result, the particles of the powder 4 are plastically deformed on the surface of the substrate 2 to form the coating 3. And in this manufacturing method, before forming the membrane | film | coat 3, the surface of the base material 2 is activated. Incidentally, unlike the present invention, the conventional cold spray method does not have a substrate treatment step for activating the surface of the substrate 2 prior to the film formation step. That is, in the conventional cold spray method, the energy required for plastically deforming the powder 4 when the surface of the substrate 2 is not sufficiently activated or when the coating 3 is formed on the substrate 2 is obtained. The energy required for the activation of the substrate 2 is cut. As a result, in the conventional cold spray method, the plastic deformation of the powder 4 colliding with the base material 2 becomes insufficient, and the bonding strength between the base material 2 and the coating 3 is lowered.

  On the other hand, since the manufacturing method of this invention has a film formation process separately from this base material processing process, after passing through the base material processing process which activates the surface of the base material 2, a base material The surface of the base material 2 is sufficiently activated in the treatment step, and energy is not scraped to activate the base material 2 in the film formation step, and the powder 4 is efficiently and sufficiently plastically deformed. As a result, according to the production method of the present invention, it is possible to obtain the laminate 1 that is excellent in the bonding strength of the coating 3 to the substrate 2.

  In addition, according to the manufacturing method of the present invention using the cold spray method in the base material processing step, the above-mentioned “powder speed” can be achieved without requiring other equipment to activate the surface of the base material 2. By changing, the surface of the base material 2 can be activated easily and reliably. Further, by using the same kind of powder 4 as that for forming the film 3, there is no possibility that the blast particles remain as foreign matters on the surface of the substrate 2, for example, unlike the blasting method. . Further, if an inert gas such as helium is used as the gas 5, even if the base material 2 that is easily oxidized is used, for example, the surface of the base material 2 is prevented from being oxidized.

The present invention is not limited to the above embodiment, and can be implemented in various forms.
The manufacturing method of the present invention can be applied to a method of manufacturing the laminate 1 as various machine parts, or may be applied to a method of repairing by covering the surface of an article with the film 3. In this case, the article to be repaired corresponds to the base material 2.

  In the above embodiment, it is assumed that the substrate processing step sets the “powder speed” and the injection time of the powder 4 in the range of the region 2 shown in FIG. 3, but the present invention is limited to this. Alternatively, the spraying time of the powder 4 may be set so that the surface of the substrate 2 can be activated in the region 1 of FIG. Incidentally, when this region 1 is applied, the surface of the substrate 2 is activated as described above, but the powder 4 is deposited on the surface of the substrate 2 because the plastic deformability of the powder 4 is insufficient. Limited to not.

Next, examples in which the effects of the present invention have been confirmed will be described.
(Setting of conditions for activation of the substrate 2)
In this example, the injection conditions of the powder 4 (see FIG. 2A) for activating the surface of the substrate 2 (see FIG. 2A) were determined as follows. Here, first, a base material 2 (60 mm × 30 mm × 4 mm) buffed so as to have a surface roughness Ra of 0.06 μm with an aluminum casting type 2 A (AC2B: Al—Cu—Si), and a composition Is composed of 94.96 atomic% aluminum, 1.68 atomic% iron, 2.24 atomic% chromium, 0.56 atomic% titanium, and 0.56 atomic% cobalt, and has an average particle size of 14.97 μm powder 4 was prepared.

  Next, the powder 4 was sprayed onto the surface of the substrate 2 by a cold spray method for 20 seconds. In this cold spray method, the Laval nozzle 100 shown in FIG. 2A was used as a spray gun, and 400 ° C. helium was supplied to the spray gun at 0.5 MPa. Further, the distance between the spray gun outlet and the surface of the substrate 2 was set to 20 mm.

  FIG. 6 referred to here is a scanning electron micrograph showing a state in which the powder is deposited on the surface of the base material, wherein (a) is the state of the base material before the powder is jetted (jetting time 0 second). A photograph showing the appearance of the surface, (b) is a photograph showing the appearance of the surface of the substrate at a powder injection time of 1 second, and (c) is a photograph of the surface of the substrate at a powder injection time of 2 seconds. (D) is a photograph showing the state of the surface of the substrate at a powder injection time of 3 seconds, (e) is a photograph showing the state of the surface of the substrate at a powder injection time of 4 seconds, ( f) is a photograph showing the appearance of the surface of the substrate at a powder injection time of 8 seconds.

  As shown in FIGS. 6A and 6B, the powder 4 is not deposited on the surface of the base material 2 until the spraying time of the powder 4 has passed 1 second. In addition, it was confirmed that a large number of craters C were formed on the surface of the substrate 2 at an injection time of 1 second (see FIG. 6B).

  And as shown in FIG.6 (c), one particle | grains of the powder 4 were recognized on the surface of the base material 2 whose injection time of the powder 4 was 2 second in the visual field of the scanning electron microscope. Incidentally, the powder 4 was of a degree that adhered to the surface of the substrate 2 without being plastically deformed.

  Next, as shown in FIGS. 6D to 6F, the powder 4 is plastically deformed and deposited on the surface of the substrate 2 as the spray time of the powder 4 elapses 3 seconds, 4 seconds, and 8 seconds. It was confirmed that the powder 4 gradually increased. Incidentally, in the case where the spraying time of the powder 4 reached 20 seconds (not shown), the coating 3 made of the deposited powder 4 was peeled off from the substrate 2.

  Therefore, activation of the surface of the base material 2 here is performed by setting the spraying time of the powder 4 to 2 seconds, and when the spraying time longer than that is spent, the coating 3 that is easily peeled off from the base material 2 is formed. It was confirmed that

Example 1
In Example 1, an aluminum casting type 2A (AC2B: Al—Cu—Si) that was buffed so that the surface roughness Ra was 0.06 μm (50 mm × 15 mm × 10 mm) was prepared. Then, the aluminum alloy powder 4 in this example was sprayed onto the surface of the substrate 2 to activate the surface of the substrate 2. The condition setting for the activation of the base material 2 here was the condition previously determined in this example. That is, 400 ° C. helium was supplied to the spray gun at 0.5 MPa, and the distance between the spray gun outlet and the surface of the substrate 2 was set to 20 mm. Then, the traverse speed of the spray gun was set to 100 mm / second so that the spraying time of the powder 4 on the surface of the substrate 2 was approximately the same as the above-described 2 seconds. Incidentally, the traverse pitch of the spray gun was set to 4 mm, and the number of traverses (number of overlaps) was one.

FIG. 7 referred to here is a scanning electron micrograph showing the state of the surface of the substrate activated in Example 1. FIG.
As shown in FIG. 7, the crater C is confirmed on the surface of the substrate 2 activated in Example 1, and the powder 4 adhered to the substrate 2 without plastic deformation in the field of view of the scanning electron microscope. Of 1 particle was confirmed.

  Next, the aluminum alloy powder 4 in the present embodiment is sprayed onto the surface of the base material 2 as described above, and a film 3 having a thickness of 600 μm (see FIG. 4A) is applied to the surface of the base material 2. Thus, a laminate 1 (see FIG. 4A) was produced. Here, 400 ° C. helium was supplied to the spray gun at 3 MPa, the traverse pitch of the spray gun was changed from 4 mm to 2 mm, and the number of traverses (number of overlaps) was changed from 1 to 4 times. The powder 4 was sprayed onto the base material 2 in the same manner as described above for the activation of the base material 2.

  With respect to this laminate 1, the bonding strength of the film 3 to the substrate 2 was measured. The measurement of the bonding strength was performed with the following shear test apparatus. FIG. 9 is a schematic diagram of a shear test apparatus in which the bonding strength of the film to the base material in the laminate obtained in Example 1 was measured.

  As shown in FIG. 9, the shear test apparatus includes a pair of support portions 11 a and 11 b that support the test piece T cut out from the laminate 1, and a shear blade 10 that applies a load F to the coating 3 of the test piece T. It has. The cutting edge of the shearing blade 10 is disposed on the coating 3 portion of the test piece T cut out to a size described later from the laminate 1 and descends at a rate of 100 mm / second at the interface between the substrate 2 and the coating 3. Shear force is applied. Incidentally, the test piece T is obtained by slicing the laminate 1 (see FIG. 1) so that the thickness W is 1 mm and the width (the length in the direction perpendicular to the paper surface of FIG. 9) is 10 mm. is there.

  And here, the load F when the film 3 peeled from the substrate 2 was measured as the bonding strength. The result is shown in FIG. FIG. 10 is a graph showing the bonding strength of the film to the substrate in the laminates obtained in Example 1 and Example 2 and Comparative Example 1 described later, and the vertical axis represents the bonding strength [MPa].

(Example 2)
In Example 2, when the surface of the substrate 2 is activated, the powder 4 is based on the same manner as in Example 1 except that the number of traverse times (number of overlaps) of the spray gun is changed from 1 to 2 times. Sprayed onto the surface of the material 2.
FIG. 8 referred to here is a scanning electron micrograph showing the state of the surface of the substrate activated in Example 2. FIG.
As shown in FIG. 8, the crater C is confirmed on the surface of the substrate 2 activated in Example 2, and the surface of the substrate 2 is deposited so as to cover about 25% in the field of view of the scanning electron microscope. Powder 4 was confirmed. The particles of the powder 4 had insufficient plastic deformation.

Next, the aluminum alloy powder 4 in the present embodiment is sprayed on the surface of the base material 2 in the same manner as in the first embodiment to form a film 3 having a thickness of 600 μm on the surface of the base material 2. Thus, a laminate 1 was produced.
With respect to this laminate 1, the bonding strength of the film 3 to the substrate 2 was measured in the same manner as in Example 1. The result is shown in FIG.

(Comparative Example 1)
In Comparative Example 1, the same substrate 2 as in Example 1 was used except that the surface was not activated. Then, the aluminum alloy powder 4 in the present embodiment is sprayed on the surface of the base material 2 in the same manner as in the first embodiment to form a film 3 having a thickness of 600 μm on the surface of the base material 2. 1 was produced.
With respect to this laminate 1, the bonding strength of the film 3 to the substrate 2 was measured in the same manner as in Example 1. The result is shown in FIG.

(Evaluation of Laminate 1 Obtained in Examples and Comparative Examples)
As shown in FIG. 10, the laminated body 1 in Example 1 and Example 2 in which the surface of the base material 2 was activated in advance is more than the laminated body 1 in Comparative Example 1 in which the surface of the base material 2 was not activated. Also, it was confirmed that the bonding strength [MPa] of the coating 3 to the substrate 2 was excellent.

In addition, the laminate 1 in Example 1 in which the surface of the base material 2 was activated so that the powder 4 hardly deposited on the surface of the base material 2 was obtained when the surface of the base material 2 was activated. It was confirmed that the bonding strength [MPa] of the coating 3 to the substrate 2 was superior to the laminate 1 in Example 2 deposited so as to cover a part of the surface of the material 2. That is, it was confirmed that the activation of the surface of the base material 2 is desirably performed so that the powder 4 does not accumulate on the surface.
In addition, in the manufacturing method of the above laminated bodies 1, the powder 4 used for the activation of the surface of the base material 2 can be collect | recovered and reused.

It is a fragmentary sectional view of the layered product obtained by the manufacturing method concerning an embodiment. (A) is process explanatory drawing explaining a mode that a laminated body is manufactured with the manufacturing method which concerns on embodiment, Comprising: It is a figure which shows a base-material process process, (b) is the base material in (a). It is the elements on larger scale of the surface. It is a graph which shows the relationship between the time until the powder can be deposited on the base material (deposition required time) and the speed of the powder colliding with the base material, where the vertical axis represents the necessary deposition time [second] The axis represents the powder speed [m / sec]. (A) is process explanatory drawing explaining a mode that a laminated body is manufactured with the manufacturing method which concerns on embodiment, Comprising: It is a figure which shows a film formation process, (b) is the surface of the base material in (a) FIG. It is a time chart of the substrate treatment process and the film formation process in the manufacturing method according to the embodiment, the vertical axis represents the pressure [MPa] of gas supplied to the Laval nozzle, and the horizontal axis represents the injection time [second] of the Laval nozzle. . It is a scanning electron micrograph which shows a mode that powder is deposited on the surface of a base material, (a) is a photograph which shows a mode of the surface of a base material before injection of a powder (injection time 0 seconds), ( b) is a photograph showing the state of the surface of the substrate at a powder injection time of 1 second, (c) is a photograph showing the state of the surface of the substrate at a powder injection time of 2 seconds, (d) is A photograph showing the state of the surface of the base material when the powder injection time is 3 seconds, (e) is a photograph showing the state of the surface of the base material when the powder injection time is 4 seconds, and (f) is the powder injection time. It is a photograph which shows the mode of the surface of the base material in 8 seconds. 2 is a scanning electron micrograph showing the state of the surface of a substrate activated in Example 1. FIG. 4 is a scanning electron micrograph showing the state of the surface of a substrate activated in Example 2. FIG. 2 is a schematic diagram of a shear test apparatus that measures the bonding strength of a film to a base material in the laminate obtained in Example 1. FIG. It is a graph which shows the joining strength of the film | membrane with respect to the base material in the laminated body obtained in Example 1, Example 2, and the comparative example 1, and a vertical axis | shaft represents joining strength [MPa].

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated body 2 Base material 3 Film | membrane 4 Powder 5 Gas

Claims (4)

In the method for producing a laminate in which a film is formed on the surface of a substrate by a cold spray method,
A substrate treatment step for pre-activating the surface of the substrate;
After this substrate treatment step, a film formation step of forming the film on the surface of the substrate by a cold spray method,
The manufacturing method of the laminated body characterized by having.   The method for producing a laminate according to claim 1, wherein the substrate treatment step is a step of activating the surface of the substrate by spraying powder onto the surface of the substrate by a cold spray method. .   The speed of the powder sprayed onto the base material in the base material treatment step is lower than the speed of the powder sprayed onto the base material in the film forming step. Production method.   The method for producing a laminate according to any one of claims 1 to 3, wherein the powder used in the cold spray method is made of a quasicrystalline dispersed aluminum alloy or an amorphous dispersed alloy.