JP2007070693A - Compact of fine powder material, and method for compacting the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact of a fine powder material having a dense internal structure and excellent mechanical properties, and in which thickness in a pressing direction is sufficiently thick, to provide a compacting method capable of efficiently obtaining the same, and to provide a joining method and a coating method utilizing the same. <P>SOLUTION: A fine powder material is packed into a vessel for packing powder, and is stirred under compression with bar-shaped stirring tools, so as to be compacted. Using the compacting method, friction joining and coating of a member are performed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solidified compact of a fine powder substance having a dense internal structure and excellent mechanical properties, a solidified molding method for efficiently obtaining the same, and a joining method and a coating method using the method.

  Conventionally, highly functional materials have been manufactured using metal powder as a fine powder substance. For example, a hot press method or a HIP method using metal powder and capable of near-net shape is applied to a strength part having a complicated shape, and particularly a dense structure and excellent mechanical properties are required. Strength parts and the like are manufactured by the HIP method. On the other hand, development of a solidification molding method for obtaining a high-functional material has been performed irrespective of a sintering method such as a hot press method or an HIP method (Non-patent Document 1).

  Non-Patent Document 1 proposes a method of obtaining a solidified molded body 26 of metal powder having a shape as shown in FIG. 12 using a pair of forming tools 20 and 21 as shown in FIG. In the solidification forming method described in Non-Patent Document 1, a predetermined amount of metal powder 22 is filled between a pair of forming tools 20 and 21 and then compressed by the pair of forming tools 20 and 21 in the figure. The forming tool 21 shown below is rotated in the rotation direction 25 to form a solidified molded body 26. In FIG. 11, reference numeral 23 denotes the rotational axis center of the forming tool 21.

  Here, the pair of forming tools 20 and 21 are arranged so that the working surfaces facing each other are parallel, and an opening is formed in a radial direction perpendicular to the pressing direction 24. Using such a pair of forming tools 20 and 21, the solidified molded body 26 obtained has a thin thickness t as shown in FIGS. 12 (a) and 12 (b), and its properties are uniform in the thickness direction. However, there is a feature that the property changes depending on the radial distance r measured in the radial direction from the molded body center 27.

On the other hand, in Patent Document 1, aluminum powder particles are filled in the gaps S between the joining surfaces, and the joining portion of the aluminum material is heated and plasticized by frictional heat, and is stirred and mixed to form panel P, P There is disclosed a friction stir welding method for joining the two. As schematically shown in FIG. 13, the joining method described in Patent Document 1 is a suitable method for joining long aluminum members such as profile panels P and P using a joining tool 30. . In FIG. 13, S indicates a gap before clamping, and F indicates a correction force for clamping. θ represents the inclination of the surface of the shoulder portion 30 </ b> B in the welding tool 30, and is equal to the angle formed by the rotation center 31 of the welding tool 30 and the normal line of the table 33. In this friction stir welding method, the shape panels P and P are placed on the table 33, and the joining tool 30 is moved at a high speed in the moving direction 32 along the joining surface. Since the metal powder is heated and plasticized together with the joining portion of the aluminum material by the frictional heat with the pin 30A and the frictional heat between the joining portion and the shoulder portion 30B of the joining tool 30, the gap S between the butted surfaces is formed. Even if it is large, the gap S is filled to prevent the smoothness of the joint surface from being lowered and the joint strength from being lowered at the joint.
JP 2001-205457 A Hideki Maeda and 2 others Plasticity and processing, Vol. 37, No. 431 (1996) p1291-1297

  Here, the solidification molding method of the metal powder described in Non-Patent Document 1 is also referred to as a crystal surface solidification molding method by twisting, compression, and shearing. By causing compression deformation and shear deformation in the powder 22 and causing shear deformation by twisting, the oxide film formed on the surface of the metal powder is broken and processing heat generated by the deformation, heating from the outside, In addition, the frictional heat generated by the contact between the working surface and the metal powder 22 is used to strengthen the bond between the metal powders.

  However, in the crystal surface solidification molding method by twisting, compression, and shearing described in Non-Patent Document 1, even if a sufficient amount of metal powder 22 is filled between the pair of molding tools 20 and 21, Since the metal powder 22 is pushed out from the opening formed in the direction perpendicular to the pressing direction 24 as the distance between the working surfaces facing each other is narrowed, only a disk-shaped formed body having a small thickness t can be obtained. There was a problem that could not.

Patent Document 1 describes a friction stir welding method for joining long aluminum members such as a shape panel, but a method for obtaining a solidified molded body having a dense internal structure and excellent mechanical properties. Is not mentioned.
In addition, the joining method by friction stirring described in Patent Document 1 moves the joining tool 30 in the moving direction 32 along the joining surface while rotating the joining tool 30 at high speed, so that the rotational energy of the tool rotated at high speed is joined. There is also a drawback in that the metal powder cannot be efficiently solidified and dispersed along the surface.

  Accordingly, the present invention provides a solidified molded body of a fine powder substance having a dense internal structure and excellent mechanical properties and sufficiently thick in the pressing direction, a solidified molding method for efficiently obtaining the solidified molded body, and a joint using the same It is an object to provide a method and a coating method.

The present inventors have intensively studied, and using a powder filling container in which a predetermined amount of pulverized material is confined in a space and a stirring tool for pressing and stirring the pulverized material, easily achieve enhanced bonding between the pulverized materials. The inventors have found that this is possible and have come to make the present invention.
The present invention is as follows.
1. A solidified compact of a fine powder material obtained by solidifying and molding by compressing and stirring the fine powder material.

2. A method for solidifying and molding a fine powder material, comprising: filling a powder filling container with a predetermined amount of a fine powder material, stirring the mixture while compressing with a rod-shaped stirring tool, and solidifying and molding.
3. 3. The method for solidifying and molding a fine powder material according to 2 above, wherein the powder filling container is filled with two or more kinds of fine powder materials mixed in advance and solidified and molded.
4). 4. The method for solidifying and molding a fine powder material according to 2 or 3 above, wherein the obtained solidified body is subjected to secondary processing by extrusion molding, press molding or the like.

5. 2. The fine powder material is a metal powder. ~ 4. The solidification molding method of the fine powder substance in any one of.
6). In the joining method of joining members using frictional heat, the solidified molding method of the fine powder substance described in 2 or 3 above is used, and the resulting solidified molded body and the stirring tool are passed through the working surface of the stirring tool. Joining method characterized by joining.

  7). A coating method for coating a coating material on the surface of a member to be coated, characterized in that the solidified molded body obtained by coating the working surface of the stirring tool is coated using the solidified molding method of fine powder material described in 2 or 3 above. Coating method to do.

  According to the present invention, it is possible to easily obtain a solidified molded body of a fine powder substance having a dense internal structure and excellent mechanical properties and sufficiently thick in the pressing direction. Further, according to the joining method and the coating method using the same, the obtained solidified molded body and the stirring tool can be easily joined via the working surface of the stirring tool, and the solidified molding obtained on the working surface of the stirring tool. The body can be covered easily.

The fine powder substance will be described below as a metal powder.
First, a suitable molding tool for use in the method for solidifying and molding a fine substance according to the present invention will be described with reference to the drawings. FIG. 1 shows a schematic cross-sectional view of a forming tool, and FIG. 2 shows the shape of a stirring tool 1 having a pressing portion 1A at a lower portion suitable for use in the present invention. A forming tool suitable for use in the present invention includes a stirring tool 1 having a pressing portion 1A at a lower portion and a powder filling container 4 capable of storing a predetermined amount of metal powder 5 with the lower punch 2 attached.

The powder filling container 4 is composed of a lower punch 2 and a die 3, and a predetermined amount of metal powder is pressed against the pressing portion 1A, the lower punch 2, and the die 3 with the stirring tool 1 inserted from above. It can be confined in the space formed by. On the other hand, the stirring tool 1 has one end portion (upper portion in FIG. 1) connected to a driving device (not shown) and is movable up and down, and has a pressing portion 1A at the other end portion (lower portion in FIG. 1). It is formed in a rod shape that can press and stir the metal powder 5. That is, the outer diameter of the stirring tool 1 other than the pressing portion 1 </ b> A is a thickness that does not contact the inner wall surface of the die 3.
Further, the gap between the outer periphery of the pressing portion 1A and the inner wall surface of the die 3 allows the stirring tool 1 to rotate smoothly during molding, and a predetermined amount of the metal powder 5 filled in the powder filling container 4 leaks. It is formed so as not to come out. This is preferable because the rotational energy of the stirring tool 1 can be used effectively for solidification molding of the metal powder 5. The forming tool is arranged so that the axis of the lower punch 2 and the center of the through hole provided in the die 3 are coaxial with the rotational axis center 8 of the stirring tool 1. In FIG. 1, 6 and 7 indicate the pressing direction and the rotating direction of the stirring tool 1, respectively.

2A shows a strain gauge attached to the lower punch 2 in order to measure the compressive force applied to the metal powder 5 during molding, and 3A shows a die for measuring the temperature of the metal powder 5 during molding. 3 shows a thermometer inserted into a hole drilled from the outer surface of 3 toward the inner space.
The hole into which the thermometer 3A is inserted is perforated at a predetermined height, leaving a little die material so that its tip does not communicate with a space in which a predetermined amount of the metal powder 5 is confined. Therefore, the temperature detected by the thermometer 3 </ b> A at the time of molding shows a value lower than the temperature of the true metal powder 5 because the temperature of the metal powder 5 is measured through the die material.

  Here, FIG. 2A shows the stirring tool 1 in which the screw portion 9 is provided on the flat lower surface of the pressing portion 1A, and FIG. 2B shows the pressing portion without the screw portion 9 being provided. A stirring tool 1 having a flat lower surface of 1A as a working surface facing the lower punch 2 is shown. The working surface refers to a surface that contacts the metal powder 5 during molding. That is, as shown in FIG. 2A, in the case of the stirring tool 1 provided with the screw portion 9 aiming at promoting stirring of the metal powder 5, the lower surface of the pressing portion 1A without the screw portion 9 and the screw The entire surface of the portion 9 is the working surface. The screw portion 9 is formed coaxially with the rotation axis center 8 of the stirring tool 1.

Next, the solidification molding method according to the present invention will be described.
The metal powder solidification method according to the present invention uses a molding tool shown in FIGS. 1 and 2, and after a predetermined amount of metal powder 5 is filled in a powder filling container 4, it is compressed by a rod-shaped stirring tool 1. In this method, the mixture is stirred and solidified. 3A and 3B schematically show cross-sectional views of the solidified molded body 10 thus obtained. In FIG. 3, L represents a thickness direction distance measured in the thickness direction from the lower surface of the pressing portion of the stirring tool 1, and r represents a radial direction distance measured in the radial direction from the molded body center 11.

  According to the metal powder solidification molding method described above, the metal powder 5 filled in the powder filling container 4 is stirred while being compressed by the stirring tool 1, so that an oxide film formed on the surface of the metal powder is formed. At the same time, the metal powder 5 is heated due to frictional heat, and the metal powder 5 is softened. At the same time, plastic flow occurs in the metal powder 5 due to the contact between the working surface of the stirring tool 1 and the metal powder 5. In this way, rotational energy is transmitted to the metal powder 5 from the stirring tool 1 via the working surface of the pressing portion 1A, so that the strengthening of the metal powder can be easily achieved without external heating. Can do. As a result, it is possible to easily obtain a solidified body of a metal powder having a dense internal structure and excellent mechanical properties and having a sufficiently thick thickness t in the pressing direction.

  The frictional heat generated in the metal powder 5 at the time of molding includes (i) frictional heat due to contact between the outer peripheral surface of the pressing portion 1A and the inner wall surface of the die 3, and (ii) the working surface of the stirring tool 1 and the metal powder 5. There is frictional heat due to contact, and (iii) frictional heat due to contact between the metal powders 5, thereby causing a temperature rise. For example, in the examples described later, the powder powder container 4 is filled with a metal powder 5 having a thickness t = 6 mm and a diameter = 12 mm, and the maximum compressive load is 5 kN. Since the maximum temperature of 100 to 200 ° C. was detected by the thermometer 3A under the molding conditions where the rotation speed was 820, 1375, and 1785 rpm, when the temperature before molding was 25 ° C., the metal powder 5 being molded was The temperature rise exceeding 75-175 degreeC had arisen.

Further, due to the frictional heat and the plastic flow caused by the contact between the working surface of the stirring tool 1 and the metal powder 5, the solidified molded body 10 composed of the portions as shown in FIGS. 7A and 9A is obtained. Obtained.
That is, the friction stirrer 10A in which strong metal powder plastic flow and frictional heat are generated by contact with the stirring tool 1 and the strong metal powder flow and friction generated by contact with the stirrer 1 following the friction stirrer 10A. There is at least a heat affected zone 10B affected by heat, or there is a heat affected zone 10C that receives only the heat affected by the heat affected zone 10B.

  As will be described later, the heat-affected zone 10C has a relative density lower than that of the friction stir zone 10A or the fluidized heat-affected zone 10B and has a large number of pores, and its internal structure and mechanical properties are slightly inferior. On the other hand, the friction stirrer 10A and the flow heat affected part 10B affected by the flow and frictional heat from the friction stirrer 10A have a dense internal structure and excellent mechanical properties except for a very small part. . Accordingly, when it is necessary to further increase the thickness t in the pressing direction, the heat-affected zone 10C having a slightly inferior internal structure and mechanical properties can be included, but when the internal structure and mechanical properties are emphasized. It is preferable not to include the heat-affected zone 10C having many holes.

Here, as the metal powder 5 to be used, one type or two or more types of powders can be used. When two or more kinds of metal powders are used, two or more kinds of premixed metal powders are filled in the powder filling container 4 and then solidified and molded so that each powder is uniformly dispersed in the solidified molded body. Is preferable.
The metal powder 5 is preferably an aluminum-based, copper-based, iron-based, or silicon-based metal powder, and in particular, the present invention is an aluminum-based metal powder that is bonded to oxygen and covered with a strong oxide film. It is more preferable to apply The present invention can also be applied to non-metallic powders such as plastic powders.

Moreover, it is preferable to secondary-process the obtained solidification body by extrusion molding, press molding, etc. The reason for this is that by making the shape of the molding tool to be used correspond to the shape of the solidified molded body to be produced, solid molded bodies of various shapes such as rods and pipes can be obtained. This is because it can be processed into a part having a proper shape.
Further, according to the solidification molding method of the metal powder according to the present invention, after a predetermined amount of metal powder is filled in the powder filling container 4, the powder is stirred while being pressed by the stirring tool 1, and the compression load is the maximum of the predetermined value. After reaching the compressive load, a predetermined maximum compressive load is applied for a certain time (30 to 60 seconds), the rotation is stopped after the solidification molding is completed, and the stirring tool 1 is pulled out after cooling, so that FIG. ), The solidified molded body 10 in the state shown in (b) can be obtained. Therefore, according to the joining method and the coating method using the solidification method, the obtained solidified molded body 10 and the stirring tool 1 can be easily joined via the working surface of the stirring tool, and the action of the stirring tool 1 can be obtained. The obtained solidified molded body 10 can be easily coated on the surface.

  However, in order to prevent the solidified molded body 10 from adhering to the powder filling container 4, a release agent such as carbon graphite is applied to the upper surface of the lower punch 2 and the inner wall of the die 3 before filling the metal powder. Keep it.

  1 and 2, after a predetermined amount of metal powder 5 is filled in the powder filling container 4, the stirring tool 1 is inserted and a compression load is applied to the predetermined maximum compression by the stirring tool 1. The metal powder 5 was stirred while being compressed until the load was reached, and then the rotation was stopped, the compression load was removed, the air was cooled, and the stirring tool 1 was pulled out. As the metal powder 5, an aluminum powder (manufactured by Toyo Aluminum Co., Ltd.) having a purity of 99.76% and an average particle size of 28.46 μm was used. Moreover, the stirring tool 1 was attached to the rotating part of the milling machine.

Molding conditions and molding tools are as follows. 3A and 3B, the solidified molded body 10 in the state shown in FIGS. 3A and 3B is cut at a position of L = 0, then the density of each portion is measured, and the longitudinal section passing through the molded body center 11 Vickers hardness and texture observation were performed.
〔Molding condition〕
・ Maximum compressive load: 5kN (same for each condition)
Rotational speed of stirring tool 1: 0 to maximum 1785 rpm (As a result of stepwise increase, solidified molded body 10 with sufficient thickness t was obtained at 820, 1375, and 1785 rpm)
-Filling amount of metal powder 5: The amount by which a solidified molded body having a thickness t = 6 mm and a diameter = 12 mm is obtained using the following molding tool-Release agent: Solidified molded body 10 is fixed to the powder filling container 4 In order to prevent this, carbon graphite is applied to the upper surface of the lower punch 2 and the inner wall of the die 3 (however, carbon graphite is not applied to the working surface of the stirring tool 1).
[Molding tool]
Stirring tool 1: Carbon steel S45C, diameter of the pressing part 1A: 12 mm, thickness b of the pressing part 1A = 1.0 mm, diameter of the part other than the pressing part 1A inserted into the die 3: 10 mm
・ Working surface shape of stirring tool 1 (five types): Screw portion 9 provided (For normal screw: Nominal diameter = M4, M6, M8, For reverse screw: Nominal diameter = M6, screw from bottom of pressing part) Length up to the tip of the part a = 5 mm), without the threaded part 9 ・ Lower punch 2: Alloy tool steel SKD 11, cylindrical shape with a diameter of 12 mm ・ Die 3: Alloy tool steel SKD 11, outer diameter Is a cylindrical shape with a diameter of 50 mm and an inner diameter of 12 mm.
-About relative density The density of each part of the obtained solidification molded object 10 was measured, and it remove | divided by the true density of the pure aluminum, and was set as the relative density. At that time, when the stirring tool 1 provided with the screw part 9 is used to remove the carbon graphite of the mold release agent adhering to the surface of the molded body, the density of the aluminum part is removed by using purified water to exclude the screw part 9. Measured by the method. An electronic hydrometer (Mirage Trading Co., Ltd. SD-200L) was used for density measurement by the Archimedes method.

Note that the relative density values obtained by cutting the solidified molded body having a thickness t of 6.0 mm in order in the thickness t direction at appropriate intervals in order are the thickness direction distance L = 0, 1. Plotted as values at 5, 3.0, 4.5, 6.0 mm. The results are shown in FIGS. 4, 5, and 8 (a).
-Vickers hardness of solidified molded body 10 and structure observation A vertical cross section passing through the molded body center 11 with a Vickers hardness tester using a solidified molded body 10 prepared separately from the measured relative density. Vickers hardness HV was measured. The Vickers hardness test was performed in accordance with JIS Z 2244 with a test force of 1000 g and a holding time of 15 seconds. However, the Vickers hardness test with a radial distance r = 6.0 mm was performed at a position closer to the inside than the surface.

The results are shown in FIG. 6, FIG. 7 (b), FIG. 8 (b), FIG. 8 (c), FIG. 9 (b), and FIG. In addition, pure aluminum rolled material (standard: A1050P) and a Vickers sintered product (sintering conditions: sintering temperature 500 ° C., load 10 kN, sintered product diameter 12 mm) obtained by a conventional method (hot press method). Hardness was also measured for comparison and shown in the figure.
The observation of the structure of the solidified molded body 10 was performed by using the solidified molded body 10 prepared separately from the one measured for the relative density, and corroding the longitudinal section passing through the molded body center 11 with a 0.8% NaOH aqueous solution. went. As a result, different flow patterns were observed depending on the molding conditions. The schematic diagram produced based on the structure | tissue observation result was shown in FIG. 7, FIG.

According to the structure observation result of the obtained solidified molded body 10, the friction stirrer 10 </ b> A, the fluid heat affected part 10 </ b> B, and the heat affected part 10 </ b> C are integrated, and the boundary between the friction stirrer 10 </ b> A and the fluid heat affected part 10 </ b> B. Was clearly observed, but the boundary between the flow heat affected zone 10B and the heat affected zone 10C was not clear.
From the results of the relative density shown in FIGS. 4, 5, and 8 (a), it is confirmed that the obtained solidified molded body 10 has a target relative density of 0.80 or more and is dense. Recognize. Further, from the result of the characteristic diagram showing the relationship between the relative density of the solidified molded body 10 and the thickness direction distance L shown in FIGS. 4, 5, and 8A, a location where the thickness direction distance L is close to 6 mm. The relative density of (corresponding to the heat affected zone 10C) is smaller than the friction stir zone 10A and the fluid heat affected zone 10B, and the heat affected zone 10C has a large number of minute holes. I understand. This is consistent with the results of tissue observation.

  In addition, the measurement result at the radial distance r = 6 mm is obtained when using either the stirring tool 1 provided with the screw portion 9 in the pressing portion 1A or the stirring tool 1 not provided with the screw portion 9 in the pressing portion 1A. Except for this, most of the Vickers hardness is higher than that of the sintered product obtained by the conventional method (hot press method), and it can be seen that it has excellent mechanical properties (FIGS. 6, 7B, 8). (B), FIG. 8 (b), FIG. 9 (c), FIG. 10).

  Further, when a positive screw is formed, the Vickers hardness is highest at a location where L = 3.0 mm and r = 4.0, 5.0 mm shown in FIG. 7B. The reason for this is considered to be that this portion corresponds to the flow heat affected zone 10B that is affected by the heat and flow effects from the friction stir zone 10A, and recrystallization does not occur and is work hardened by shear deformation. It is done. Note that L = 1.5 mm and r = 3.0, 4.0, 5.0 mm are within the range of the friction stirrer 10A.

  On the other hand, when a reverse screw was formed, or when the screw portion 9 was not provided, a result different from the case where a normal screw was formed was obtained. This is probably because the frictional heat and the state of plastic flow have changed due to the difference in the shape of the working surface of the stirring tool 1.

It is a schematic sectional drawing which shows a suitable shaping | molding tool used for this invention. It is a front view which shows the shape of the suitable stirring tool used for this invention. It is sectional drawing which shows the state of the solidification molded object obtained by this invention. It is a characteristic view which shows the relationship between the relative density and the thickness direction distance L of the solidification molded object obtained by this invention. It is a characteristic view which shows the relationship between the relative density and the thickness direction distance L of the solidification molded object obtained by this invention. It is a characteristic view which shows the relationship between the Vickers hardness and the thickness direction distance L of the solidification molding obtained by this invention. (A) is sectional drawing which shows typically the part of the solidification molded object obtained by this invention, (b) is a characteristic view which shows the Vickers hardness change by the part. (A) is another characteristic figure which shows the relationship between the relative density of the solidification molded object obtained by this invention, and the thickness direction distance L, (b), (c) is Vickers hardness of the solidification molded object, and It is a characteristic view which shows the relationship between the radial direction distance r and the thickness direction distance L. (A) is the other sectional view showing typically the portion of the solidification fabrication object obtained by the present invention, and (b) is another characteristic figure showing the change in Vickers hardness by the portion. It is the other characteristic view which shows the Vickers hardness change of the solidification molded object obtained by this invention. It is a perspective view explaining the problem of the solidification shaping | molding method of the metal powder of the nonpatent literature 1. FIG. (A) is a top view which shows the shape of the solidification molded object obtained by the solidification shaping | molding method of the metal powder of the nonpatent literature 1, (b) is XX sectional drawing. It is a perspective view for demonstrating the joining method by the friction stirring of patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stirring tool 1A Pressing part 2 Lower punch 2A Strain gauge 3 Dies 3A Thermometer 4 Powder filling container 5 Metal powder 6 Pressing direction 7 Rotating direction 8 Rotating shaft center 9 Screw part 10 Solidified compact 10A Friction stirring part 10B Fluid heat influence Part 10C Heat-affected zone 11 Molded body center t Thickness of solidified molded body L Thickness direction distance measured in thickness direction from lower surface of pressing part of stirring tool r Radial distance measured in radial direction from molded body center 20, 21 Forming tool 22 Metal powder 23 Rotating axis center 24 Pressing direction 25 Rotating direction 26 Solidified molded body 27 Molded body center 30 Joining tool 30A Pin 30B Shoulder 31 Rotating center 32 Moving direction 33 Table P Profile panel F Correction force θ Shoulder 30B Inclination of the surface S Clearance before clamping

Claims (7)

  A solidified compact of a fine powder material obtained by solidifying and molding by compressing and stirring the fine powder material.   A method for solidifying and molding a fine powder material, comprising: filling a powder filling container with a predetermined amount of a fine powder material, stirring the mixture while compressing with a rod-shaped stirring tool, and solidifying and molding.  The method for solidifying and molding a fine powder material according to claim 2, wherein the powder filling container is filled with two or more kinds of fine powder materials mixed in advance and solidified and molded.  The method for solidifying and molding a fine powder material according to claim 2 or 3, wherein the obtained solidified body is subjected to secondary processing by extrusion molding, press molding or the like.   The method for solidifying and forming a fine powder material according to any one of claims 2 to 4, wherein the fine powder material is a metal powder.  In the joining method which joins members using frictional heat, the solidification molding method of the fine powder substance of Claim 2 or 3 is used, and the solidification molded object obtained and the said stirring tool are made into the working surface of the said stirring tool. A bonding method, characterized in that bonding is performed via  In the coating method which coat | covers a coating substance on the surface of a to-be-coated member, the solidification molded object obtained on the working surface of the said stirring tool is coat | covered using the solidification molding method of the fine powder substance of Claim 2 or 3. Coating method.

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