JP2019025496A - Manufacturing method of member, and member - Google Patents

Abstract

To provide a manufacturing method of a member with excellent heat radiation property and durability which exhibits excellent productivity and can accurately construct a ceramic coating layer on a metal base material of a complicated shape.SOLUTION: A manufacturing method of a member, which is formed by bonding a metal base material 20 and a ceramic coating layer for emitting heat with a brazing material layer, includes: a first bonding process of forming a ceramic coating layer on one surface of a brazing material layer by contacting the brazing material layer with ceramic coating layer raw material and thermally treating in an inert gas atmosphere at 900-1050°C; and a second bonding process of bonding the brazing material layer and the metal base material by contacting a surface of the brazing material layer opposite to the surface with the ceramic coating layer formed thereon with the metal base material, and thermally treating in the inert gas atmosphere at 1050-1200°C. The brazing material layer is formed of a ferrous brazing material.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for manufacturing a member and a member.

The exhaust system of an automobile is equipped with a system for purifying exhaust gas (for example, NOx purification catalyst). If the temperature of the exhaust gas when reaching the system is too high, the exhaust gas is efficiently purified. May not be possible, or the purification catalyst may be deteriorated. Therefore, an exhaust system member of an automobile is required to have a characteristic (heat dissipation) that cools exhaust gas at a high temperature.
As a method of improving the heat dissipation of the exhaust system member, a method of forming a ceramic coating layer having heat dissipation on the surface of a metal substrate is known (for example, Patent Document 1).

JP 2009-133214 A

Exhaust system members have a wide variety of shapes, and there are places where cracks are likely to occur or difficult to occur depending on the shape.Therefore, a thick ceramic coating layer is formed at places where cracks are likely to occur, It is required to finely control the thickness of the ceramic coating layer for each region, for example, by forming a thin ceramic coating layer in a place where it is difficult to generate.

However, in Patent Document 1, a slurry in which an inorganic material and water are mixed is prepared, the slurry is spray-coated on an exhaust pipe, dried at 100 ° C. for 2 hours, and then heated at 900 ° C. for 20 minutes. In this method, it is difficult to accurately adjust the thickness of the ceramic coating layer depending on the location. In addition, since it takes 2 hours to dry the slurry, the required time is long and the productivity is deteriorated.

The present invention was made in order to solve the above-mentioned problems, and the object of the present invention is excellent in productivity, and can accurately apply a ceramic coating layer to a metal substrate having a complicated shape, heat dissipation and durability. It is providing the manufacturing method of the member which is excellent in.

That is, the method for producing a member of the present invention is a method for producing a member in which a metal base material and a ceramic coating layer that releases heat are joined by a brazing material layer, and the ceramic coating layer is formed on the brazing material layer. And a second joining step for joining the brazing filler metal layer to the metal substrate, and in the first joining step, the brazing filler metal layer and the ceramic coating layer raw material are brought into contact with each other, oxygen A ceramic coating layer is formed on one side of the brazing filler metal layer by heat treatment at 900 to 1050 ° C. in an inert gas atmosphere with a concentration exceeding 0 vol% and 0.1 vol% or less. In the second joining step, The surface of the brazing material layer opposite to the surface on which the ceramic coating layer is formed is brought into contact with the metal base material, and the oxygen concentration is in an inert gas atmosphere of more than 0 vol% and 0.1 vol% or less, 1050-120 By heat treatment at ° C., and joining the said brazing material layer and the metal substrate, the brazing material layer is made of an iron-based brazing material, characterized in that.

In the member manufacturing method of the present invention, a ceramic coating layer that releases heat is formed on the brazing filler metal layer in the first joining step.
Specifically, the brazing filler metal layer and the ceramic coating layer raw material are brought into contact with each other, and heat treatment is performed at 900 to 1050 ° C. in an inert gas atmosphere having an oxygen concentration of more than 0 vol% and 0.1 vol% or less.
By the heat treatment, the ceramic coating layer raw material becomes a ceramic coating layer and is formed on the brazing material layer.
When the heat treatment temperature is less than 900 ° C., the ceramic coating layer raw material is not sufficiently softened, and the heat dissipation characteristics of the ceramic coating layer are insufficient. On the other hand, when the heat treatment temperature exceeds 1050 ° C., the brazing material may be melted.
When the oxygen concentration is 0 vol%, the ceramic coating layer does not have a uniform thickness but is striped, resulting in a deterioration in heat dissipation characteristics. On the other hand, if the oxygen concentration exceeds 0.1 vol%, the brazing material becomes brittle.

Since the brazing material layer (hereinafter also referred to as a joined body) obtained by the first joining step and having the ceramic coating layer formed on one surface has a substantially sheet shape, the size and the thickness of the ceramic coating layer are determined based on the metal base material. The sheet-like article (joined body) optimized for the shape and application of the sheet is prepared, and this is joined to the metal substrate by the second joining step, whereby the ceramic coating layer is formed and the thickness of the ceramic coating layer Can be finely controlled.

In the member manufacturing method of the present invention, the brazing filler metal layer is bonded to the metal substrate in the second bonding step. Specifically, the surface of the brazing material layer opposite to the surface on which the ceramic coating layer is formed is brought into contact with the metal substrate, and the oxygen concentration exceeds 0 vol% and is in an inert gas atmosphere of 0.1 vol% or less. , Heat treatment at 1050 to 1200 ° C. Since the surface of the brazing material layer opposite to the surface on which the ceramic coating layer is formed by the heat treatment is bonded to the metal substrate, a member in which the metal substrate and the ceramic coating layer are bonded by the brazing material layer is obtained. It is done.
When the oxygen concentration is 0 vol%, the ceramic coating layer is denatured in a stripe shape, and the heat dissipation characteristics are deteriorated. On the other hand, when the oxygen concentration exceeds 0.1 vol%, the brazing filler metal layer becomes brittle, and the bonding strength between the ceramic coating layer and the metal substrate decreases.
When the heat treatment temperature is less than 1050 ° C., the brazing material layer is not sufficiently softened, and the bonding strength between the ceramic coating layer and the metal substrate is lowered. On the other hand, when the heat treatment temperature exceeds 1200 ° C., crystallization of the material constituting the ceramic coating layer proceeds excessively, and the ceramic coating layer peels off.

The brazing filler metal layer used in the method for producing a member of the present invention is made of an iron brazing filler metal.
Since the thermal expansion coefficient of the iron-based brazing material is close to the thermal expansion coefficient of the metal base material, the adhesion between the metal base material and the brazing material layer is good.

In the method for producing a member of the present invention, the iron-based brazing material preferably has a composition of Fe: 85 to 90 wt%, P: 10 to 15 wt%, and a melting temperature of 1050 to 1150 ° C.
When the composition and melting temperature of the iron-based brazing material are the above values, it is particularly suitable for joining with the ceramic coating layer.

In the method for producing a member of the present invention, the ceramic coating layer raw material has a composition represented by a weight ratio of BaO—SiO ₂ : MnO ₂ : FeO: CoO = 60: 30: 5: 5, and has a melting temperature of 900. It is desirable to include a glass material of 1050 ° C.
When the ceramic coating layer material includes the glass material, the heat dissipation characteristics are excellent.

In the member manufacturing method of the present invention, it is desirable that the heat treatment temperature in the first joining step be equal to or lower than the melting temperature of the iron-based brazing material.
When the heat treatment temperature in the first joining step is equal to or lower than the melting temperature of the iron-based brazing material, the material constituting the ceramic coating layer and the brazing material layer do not mix with each other. It can be demonstrated.

In the member manufacturing method of the present invention, the member is preferably an exhaust system member.
Since the member manufactured by the method for manufacturing a member of the present invention is excellent in durability and heat dissipation, it can be suitably used as an exhaust system member.

The member of the present invention has a weight ratio of BaO—SiO ₂ : on the surface of at least a part of the metal substrate, with an iron brazing material having a composition of Fe: 85 to 90 wt% and P: 10 to 15 wt%: A ceramic coating layer containing a glass material having a composition represented by MnO ₂ : FeO: CoO = 60: 30: 5: 5 is formed.

The member of the present invention is preferably an exhaust system member.
Since the member of the present invention is excellent in heat dissipation and durability, it is suitable as an exhaust system member.

FIG. 1A is a perspective view schematically showing a state of a brazing material layer and a ceramic coating layer raw material before the first joining step in the method for producing a member of the present invention, and FIG. It is a perspective view which shows typically the mode of the brazing filler metal layer and ceramic coating layer after 1 joining process. FIG. 2A is a perspective view schematically showing a state of a joined body of a metal base material, a brazing material layer and a ceramic coating layer before the second joining step in the method for producing a member of the present invention. 2 (b) is a cross-sectional view taken along line AA in FIG. 2 (a). FIG.2 (c) is sectional drawing which shows typically the mode of the metal base material after a 2nd joining process, a brazing material layer, and a ceramic coating layer in the manufacturing method of the member of this invention.

(Detailed description of the invention)
Hereinafter, the manufacturing method of the member of this invention is explained in full detail.

The member manufacturing method of the present invention is a member manufacturing method in which a metal base material and a ceramic coating layer that releases heat are joined by a brazing material layer, and the ceramic coating layer is formed on the brazing material layer. A first joining step, and a second joining step for joining the brazing filler metal layer to the metal base material. In the first joining step, the brazing filler metal layer and the ceramic coating layer raw material are brought into contact with each other, and the oxygen concentration is increased. A ceramic coating layer is formed on one surface of the brazing filler metal layer by heat treatment at 900 to 1050 ° C. in an inert gas atmosphere exceeding 0 vol% and 0.1 vol% or less. In the second bonding step, The surface opposite to the surface on which the ceramic coating layer of the brazing material layer is formed is brought into contact with the metal substrate, and the oxygen concentration exceeds 0 vol% and is 0.1 vol% or less in an inert gas atmosphere Heat treatment at 1200 ° C By, joining the said brazing material layer and the metal substrate, the brazing material layer is made of an iron-based brazing material, characterized in that.

In the member manufacturing method of the present invention, a ceramic coating layer that releases heat is formed on the brazing filler metal layer in the first joining step.
Specifically, the brazing filler metal layer and the ceramic coating layer raw material are brought into contact with each other, and heat treatment is performed at 900 to 1050 ° C. in an inert gas atmosphere having an oxygen concentration of more than 0 vol% and 0.1 vol% or less.
By the heat treatment, the ceramic coating layer raw material becomes a ceramic coating layer and is formed on the brazing material layer. Since the formed ceramic coating layer can release heat, it can impart heat dissipation to the member and improve heat resistance and durability.
When the heat treatment temperature is less than 900 ° C., the ceramic coating layer raw material is not sufficiently softened, and the heat dissipation characteristics of the ceramic coating layer are insufficient. On the other hand, when the heat treatment temperature exceeds 1050 ° C., the brazing filler metal layer may be melted.
When the oxygen concentration is 0 vol%, the ceramic coating layer does not have a uniform thickness but is striped, resulting in a deterioration in heat dissipation characteristics. On the other hand, when the oxygen concentration exceeds 0.1 vol%, the brazing filler metal layer becomes brittle.

Since the brazing material layer (a joined body of the ceramic coating layer and the brazing material layer) obtained by the first joining step and having the ceramic coating layer formed on one surface thereof has a substantially sheet shape, the size and the thickness of the ceramic coating layer. A sheet-like material (joint) having a thickness optimized for the shape and application of the metal base material is prepared, and this is joined to the metal base material by the second joining step, whereby the ceramic coating layer is formed and the ceramic The thickness of the coating layer can be finely controlled.

Since the brazing material layer (a joined body of the ceramic coating layer and the brazing material layer) obtained by the first joining step and having the ceramic coating layer formed on one surface thereof has a substantially sheet shape, the size and the thickness of the ceramic coating layer. A sheet-like material (joint) having a thickness optimized for the shape and application of the metal base material is prepared, and this is joined to the metal base material by the second joining step, whereby the ceramic coating layer is formed and the ceramic The thickness of the coating layer can be finely controlled.

The form of the ceramic coating layer raw material to be brought into contact with the brazing material layer is not particularly limited, but is generally in the form of powder or slurry.
Powdered and slurry-like ceramic coating layer raw materials have low formability, and it is difficult to finely control the thickness and forming range even if an attempt is made to form a ceramic coating layer directly on a metal substrate using these materials. In the method for producing a member of the present invention, since the ceramic coating layer raw material is joined to the brazing filler metal layer in the first joining step, the thickness and the molding range can be reduced even when a ceramic coating layer raw material with low formability is used. A finely controlled ceramic coating can be formed on the metal substrate.

The ceramic coating layer raw material may be any material that forms a heat-dissipating ceramic coating layer, and examples thereof include low-temperature glass. Among them, BaO—SiO ₂ : MnO ₂ : FeO: CoO = 60: 30: 5 : It is particularly desirable that the glass material is a glass material having a melting temperature of 900 to 1050 ° C.
BaO—SiO ₂ in the above ratio means a glass component mainly composed of BaO—SiO ₂ , and a BaO—SiO ₂ glass (eg, BaO—SiO ₂ —B ₂ ) containing other components (eg, B ₂ O ₃ ). O ₃ ).
When the ceramic coating layer raw material has the glass material having the above composition and the glass material has a melting temperature of 900 to 1050 ° C., the heat dissipation characteristics of the obtained ceramic coating layer are excellent.

The heat treatment time in the first bonding step is preferably 6 to 60 minutes.
If the heat treatment time is less than 6 minutes, the ceramic coating layer raw material may not be sufficiently softened, and the heat dissipation of the ceramic coating layer may be reduced. On the other hand, if the heat treatment time exceeds 60 minutes, the crystallization of the ceramic coating layer may proceed excessively and heat dissipation may be reduced.

The brazing material layer will be described.
The brazing material layer is made of an iron-based brazing material.
Since the thermal expansion coefficient of the iron-based brazing material is close to the thermal expansion coefficient of the metal base material, the adhesion between the metal base material and the brazing material layer is good.
The composition of the iron-based brazing material is not particularly limited as long as it contains iron, but it is desirable to have a composition of Fe: 85 to 90 wt% and P: 10 to 15 wt%.
Furthermore, the melting temperature of the iron-based brazing material is desirably 1050 to 1150 ° C.
When the composition and melting temperature of the iron-based brazing material are the above values, it is particularly suitable for joining with the ceramic coating layer.

The shape of the brazing material layer is not particularly limited, but in order to join the metal substrate and the ceramic coating layer, it is desirable to have two opposing main surfaces. Examples of such a shape include a ribbon shape and a thin plate shape.

The thickness of the brazing material layer is not particularly limited, but is desirably 10 to 50 μm.
If the thickness of the brazing material layer is less than 10 μm, the brazing material layer may be too thin to sufficiently bond the metal substrate and the ceramic coating layer. On the other hand, if the thickness of the brazing filler metal layer exceeds 50 μm, the brazing filler metal layer may not sufficiently melt in the second joining step described later, and the metal substrate and the ceramic coating layer may not be sufficiently joined.

It is desirable that the heat treatment temperature in the first joining step be equal to or lower than the melting temperature of the iron-based brazing material constituting the brazing material layer.
When the heat treatment temperature in the first joining step is equal to or lower than the melting temperature of the iron-based brazing material constituting the brazing material layer, the material constituting the ceramic coating layer and the brazing material layer do not mix with each other. The heat dissipation characteristics can be fully exhibited.

The atmosphere during the heat treatment in the first bonding step may be an inert gas atmosphere having an oxygen concentration of more than 0 vol% and 0.1 vol% or less.
Examples of the gas constituting the inert gas atmosphere include argon gas and nitrogen gas.

Subsequently, the second joining step will be described.
In the second joining step, the brazing material layer is joined to the metal substrate.
Specifically, the surface of the brazing material layer opposite to the surface on which the ceramic coating layer is formed is brought into contact with the metal substrate, and the oxygen concentration exceeds 0 vol% and is in an inert gas atmosphere of 0.1 vol% or less. , Heat treatment at 1050 to 1200 ° C. Since the surface of the brazing material layer opposite to the surface on which the ceramic coating layer is formed by the heat treatment is bonded to the metal substrate, the brazing material layer bonds the metal substrate and the ceramic coating layer that releases heat. The obtained member is obtained.
When the oxygen concentration is 0 vol%, the ceramic coating layer is denatured in a stripe shape, and the heat dissipation characteristics are deteriorated. On the other hand, when the oxygen concentration exceeds 0.1 vol%, the brazing filler metal layer becomes brittle, and the bonding strength between the ceramic coating layer and the metal substrate decreases.
When the heat treatment temperature is lower than 1050 ° C., the brazing filler metal layer is not sufficiently melted, and the bonding strength between the ceramic coating layer and the metal substrate is lowered. On the other hand, when the heat treatment temperature exceeds 1200 ° C., crystallization of the material constituting the ceramic coating layer proceeds excessively, and the ceramic coating layer peels off.

The atmosphere at the time of the heat treatment in the second bonding step may be an inert gas atmosphere in which the oxygen concentration exceeds 0 vol% and is 0.1 vol% or less.
Examples of the gas constituting the inert gas atmosphere include argon gas and nitrogen gas, and nitrogen gas is desirable from the viewpoint of manufacturing cost.

The heat treatment time in the second bonding step is preferably 6 to 60 minutes.
When the heat treatment time is less than 6 minutes, the brazing material layer is not sufficiently melted, and the bonding strength between the ceramic coating layer and the metal substrate may be lowered.
On the other hand, when the heat treatment time exceeds 60 minutes, crystallization of the material constituting the ceramic coating layer proceeds excessively, and the ceramic coating layer may be peeled off.

Examples of the material constituting the metal substrate include iron, aluminum, copper, and alloys thereof. Among these, iron and iron alloys are desirable. Examples of iron alloys include austenitic stainless steel and ferritic stainless steel.
In addition, if the shape of a metal base material is a shape which can comprise a member, it will not specifically limit.

An example of the 1st joining process which comprises the manufacturing method of the member of this invention is demonstrated using Fig.1 (a)-FIG.1 (b).
FIG. 1A is a perspective view schematically showing a state of a brazing material layer and a ceramic coating layer raw material before the first joining step in the method for producing a member of the present invention, and FIG. It is a perspective view which shows typically the mode of the brazing filler metal layer and ceramic coating layer after 1 joining process.
As shown to Fig.1 (a), a brazing material layer 30 and the ceramic coating layer raw material 100 are made to contact first in a 1st joining process. In this state, the ceramic coating layer raw material becomes a ceramic coating layer by heat treatment at 900 to 1050 ° C. in an inert gas atmosphere with an oxygen concentration exceeding 0 vol% and 0.1 vol% or less, and FIG. As shown, the joined body 5 in which the ceramic coating layer 10 is formed on the brazing material layer 30 is obtained. In the joined body 5, the ceramic coating layer 10 is formed on one surface of the brazing material layer 30, and the brazing material layer 30 remains exposed on the other surface.

Subsequently, an example of the second bonding step will be described with reference to FIGS. 2 (a) to 2 (c).
FIG. 2A is a perspective view schematically showing a state of a joined body of a metal base material, a brazing material layer and a ceramic coating layer before the second joining step in the method for producing a member of the present invention. 2 (b) is a cross-sectional view taken along line AA in FIG. 2 (a). FIG.2 (c) is sectional drawing which shows typically the mode of the metal base material after a 2nd joining process, a brazing material layer, and a ceramic coating layer in the manufacturing method of the member of this invention.
As shown in FIG. 2A, in the second joining step, first, the joined body 5 is brought into contact with the metal substrate 20. Specifically, the surface opposite to the surface on which the ceramic coating layer 10 of the brazing material layer 30 is formed (the surface where the brazing material layer 30 is exposed in the joined body 5 shown in FIG. 1B) is a metal. Contact with the substrate 20. At this time, as shown in FIG. 2B, the brazing filler metal layer 30 and the metal base material 20 constituting the joined body 5 are not joined.
Thereafter, heat treatment is performed at 1050 to 1200 ° C. in an inert gas atmosphere having an oxygen concentration of more than 0 vol% and 0.1 vol% or less. The brazing material constituting the brazing material layer is melted by the heat treatment, and the member 1 in which the ceramic coating layer 10 and the metal substrate 20 are joined via the brazing material layer 30 as shown in FIG. Is obtained.
In FIG. 2B, the surface of the metal substrate 20 is not smooth, which is an expression for visually explaining whether or not the brazing material layer 30 and the metal substrate 20 are joined, and is a member of the present invention. The surface of the metal substrate used in the production method may be smooth. Of course, the surface may be subjected to a surface roughening process.

As described above, the member manufacturing method of the present invention is excellent in productivity, and can accurately apply a ceramic coating layer to a metal substrate having a complicated shape. Furthermore, the member manufactured by the method for manufacturing a member of the present invention is excellent in heat dissipation and durability since the metal base and the ceramic coating layer that releases heat are joined via the brazing material layer.

In the member manufacturing method of the present invention, the member is preferably an exhaust system member.
Since the member manufactured by the method for manufacturing a member of the present invention is excellent in durability and heat resistance, it can be suitably used as an exhaust system member.

Then, the member of this invention is demonstrated.
The member of the present invention has a weight ratio of BaO—SiO ₂ : on the surface of at least a part of the metal substrate, with an iron brazing material having a composition of Fe: 85 to 90 wt% and P: 10 to 15 wt%: A ceramic coating layer containing a glass material having a composition represented by MnO ₂ : FeO: CoO = 60: 30: 5: 5 is formed.

An iron-based brazing material having a composition of Fe: 85 to 90 wt% and P: 10 to 15 wt% is excellent in durability because the metal base material and the ceramic coating layer are firmly bonded. Further, _BaO-SiO 2 in a weight ratio: MnO 2: FeO: CoO = 60: 30: 5: ceramic coating layer containing a glass material having a composition represented by 5 has excellent heat dissipation.

As the metal substrate, the iron-based brazing material and the ceramic coating layer constituting the member of the present invention, the same materials as those described in the method for producing the member of the present invention can be suitably used. The preferable shape of the metal substrate and the thicknesses of the brazing material layer and the ceramic coating layer are also the same as in the method for producing the member of the present invention.

Since the member of the present invention is excellent in durability and heat dissipation, it can be suitably used as an exhaust system member.

(Example)
Examples for more specifically explaining the present invention are shown below, but the present invention is not limited to these examples.

Example 1
(First joining process)
A ceramic coating layer material on one surface of a brazing filler metal layer [Metglas (registered trademark) Brazing Foil (MBF) series, manufactured by Hitachi Metals, Ltd.]] made of an iron-based brazing material that is an alloy containing 13 wt% P in Fe BaO—SiO ₂ -based glass [BaO—SiO ₂ —B ₂ O ₃ powder (K807 manufactured by Asahi Glass Co., Ltd.): MnO ₂ powder: FeO powder: CoO powder = 60: 30: 5: 5 (weight ratio) The mixture was applied, heated in an argon atmosphere with an oxygen concentration of 0.1 vol% at 1000 ° C. for 10 minutes, and a ceramic coating layer was formed on the brazing material layer to obtain a joined body. When the state of the ceramic coating layer formed on the brazing material layer was evaluated, the ceramic coating layer was formed without any problem.

(Second joining process)
The joined body obtained in the above (first joining step) is placed on a stainless steel plate, which is a metal substrate, with the brazing filler metal layer side facing, and in an argon atmosphere with an oxygen concentration of 0.1 vol. The joined body and the metal base material were joined by partial heating to obtain a member according to Example 1. When the appearance of the obtained member was confirmed, there was no particular problem.

(Example 2)
The member according to Example 2 in the same procedure as in Example 1 except that the heat treatment temperature in the above (first bonding step) was changed to 900 ° C. and the heat treatment temperature in the above (second bonding step) was changed to 1050 ° C. Prepared.
When the state of the ceramic coating layer formed on the brazing material layer was evaluated, the ceramic coating layer was formed without any problem. Moreover, when the external appearance of the obtained member was confirmed, there was no problem in particular.

(Comparative Example 1)
The heat treatment temperature in the above (first bonding step) was set to 900 ° C., and the heat treatment was performed in the air (the oxygen concentration was changed to about 20 vol%). ), The brazing material became brittle, and the (second bonding step) could not be performed.

(Comparative Example 2)
Except for changing the heat treatment temperature to 1200 ° C., the above (first joining step) was performed in the same procedure as in Example 1. As a result, the brazing material was melted and the ceramic coating layer and the brazing material were mixed. Oops. The ceramic coating layer was considered not to exhibit a sufficient function, and the (second bonding step) was not performed.

(Comparative Example 3)
The iron brazing material was changed to Cu brazing material [Cu: 97 wt%, P: 3 wt%, manufactured by NEOMAX Material], and the heat treatment temperature in the above (first joining step) was changed to 1200 ° C. When the above (first joining step) and the above (second joining step) were performed in the same procedure as in Example 1, the ceramic coating layer in the above (first joining step) became non-uniform stripes, and the above The same state was continued after (second bonding step).

(Measurement of heat dissipation characteristics)
The emissivity of the ceramic coating layer surface of the members according to Examples 1 and 2 was measured using an emissometer [K & D A & D, manufactured by Kyoto Electronics Industry Co., Ltd.]. The results are shown in Table 1.
In addition, it means that it is easy to radiate | emit energy and it is excellent in heat dissipation, so that the emissivity is near 1.
In Comparative Examples 1 and 2, since the second bonding step was not performed, the emissivity was not measured, and the evaluation was impossible (−). In Comparative Example 3, since the coating layer was non-uniform, the emissivity was not measured, and the evaluation was impossible (−).

(Evaluation of controllability of ceramic coating layer)
About Example 1-2 and Comparative Examples 1-3, it evaluated about the area | region which forms a ceramic coating layer, and whether control of the thickness of the ceramic coating layer formed is easy.
In Examples 1 and 2, since the sheet-like material (joined body) prepared in the first joining step is used, it is easy to control the thickness and the formation region of the ceramic coating layer, and the evaluation is “good”. About Comparative Examples 1-2, since the appropriate joined body was not obtained in the 1st joining process, it was set as evaluation impossible (-). About the comparative example 3, since the coating layer became non-uniform | heterogenous, it was set as un-evaluable (-).
Moreover, in the member which concerns on Examples 1-2, since the ceramic coating layer is formed uniformly, without being striped, it is excellent in durability.

As shown in Table 1, it was found that the method for producing a member of the present invention is excellent in productivity and can accurately apply a ceramic coating layer to a metal substrate having a complicated shape.
Moreover, it turned out that the member manufactured by the manufacturing method of the member of this invention is excellent in heat dissipation and durability.

(Reference Example 1)
A method for manufacturing an exhaust pipe that does not use a brazing filler metal layer by a conventional technique (spray coating method) is referred to as Reference Example 1.
In Reference Example 1, a mixed liquid in which a ceramic coating layer raw material was mixed with water was prepared, applied to the surface of the metal substrate used in the above (second bonding step) by a spray coating method, and fired at 900 ° C.
Although the ceramic coating layer was formed on the surface of the metal base material constituting the member according to Reference Example 1, it was difficult to control the formation region and thickness of the ceramic coating layer by spray coating.

DESCRIPTION OF SYMBOLS 1 Member 5 Assembly 10 Ceramic coating layer 20 Metal base material 30 Brazing material layer 100 Ceramic coating layer raw material

Claims (7)

A metal base material and a ceramic coating layer that releases heat are a method for producing a member formed by joining with a brazing material layer,
A first joining step of forming a ceramic coating layer on the brazing material layer;
A second joining step for joining the brazing filler metal layer to the metal substrate,
In the first joining step, the brazing filler metal layer and the ceramic coating layer raw material are brought into contact with each other, and heat treatment is performed at 900 to 1050 ° C. in an inert gas atmosphere having an oxygen concentration of more than 0 vol% and 0.1 vol% or less, Forming a ceramic coating layer on one side of the brazing material layer;
In the second bonding step, the surface of the brazing material layer opposite to the surface on which the ceramic coating layer is formed is brought into contact with the metal base material, so that the oxygen concentration is more than 0 vol% and not more than 0.1 vol%. By heat-treating at 1050 to 1200 ° C. in an inert gas atmosphere, the brazing filler metal layer and the metal substrate are joined,
The brazing material layer is made of iron-based brazing material,
A member manufacturing method characterized by the above. The method for producing a member according to claim 1, wherein the iron-based brazing material has a composition of Fe: 85 to 90 wt%, P: 10 to 15 wt%, and a melting temperature of 1050 to 1150 ° C. The ceramic coating layer raw material has a composition represented by a weight ratio of BaO—SiO ₂ : MnO ₂ : FeO: CoO = 60: 30: 5: 5, and includes a glass material having a melting temperature of 900 to 1050 ° C. Item 3. A method for producing a member according to Item 1 or 2. The method for manufacturing a member according to claim 1, wherein a heat treatment temperature in the first joining step is equal to or lower than a melting temperature of the iron-based brazing material. The member manufacturing method according to claim 1, wherein the member is an exhaust system member. BaO—SiO ₂ : MnO ₂ : FeO: CoO by weight ratio through an iron-based brazing material having a composition of Fe: 85 to 90 wt% and P: 10 to 15 wt% on at least a part of the surface of the metal substrate. = A member characterized in that a ceramic coating layer containing a glass material having a composition represented by 60: 30: 5: 5 is formed. The member according to claim 6, wherein the member is an exhaust system member.

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