KR20140025694A - Porous metallic materials with hierarchical cell structure and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a porous metallic material having a hierarchical cell structure and a manufacturing method thereof for producing a product with a cell structure which has desired microstructures, desired product density, and desired mechanical properties by controlling the hierarchical distribution of pores and the structural properties of a porous metallic material. The manufacturing method of the porous metallic material having the hierarchical cell structure includes (a) a step of manufacturing rod-shaped specimens using a core material and a covering metallic material which covers the core material; (b) a step of forming a first bundle by gathering the specimens and manufacturing a composite of different materials, in which the rod-shaped specimens with a uniform size are hierarchically distributed, by extruding the first bundle in the longitudinal direction; and (c) a step of removing the core material from the composite of the different materials. The rod-shaped specimens, the composite of the different materials, and a multi-material of different materials obtain directivity and form the hierarchical distribution inside the product. The present invention manufactures the metallic material by removing the male core material manufactured by controlling various conditions so that the directivity, the size, and the density (the distribution of the pores in comparison with cross sectional area) of the pores can be varied. Therefore, the present invention can obtain a porous metallic material with a hierarchical cell having desired properties such as weight and mechanical strength.

Description

POROUS METALLIC MATERIALS WITH HIERARCHICAL CELL STRUCTURE AND METHOD OF MANUFACTURING THE SAME

The present invention relates to a porous metal material having a hierarchical cell structure and a method of manufacturing the same, and specifically, to controlling the structural characteristics of the metal material forming the pores and the hierarchical distribution of a plurality of pores, to a desired level of microstructure and product density. And a porous metallic material having a hierarchical cell structure for producing a product having a cell structure having mechanical properties, and a method of manufacturing the same.

In general, the porous metal material is lightened by low relative density compared to the volume of the outer shape, and at the same time exhibits low thermal modulus and excellent thermal and mechanical properties such as high impact absorption energy.

For this reason, in recent years, various methods for making a porous metal material have been tried.

Representative methods of producing porous metal materials include metal deposition and powder metallurgy.

However, the above-described prior arts make metals in gaseous, liquid or powder form in a predetermined bulk shape, and it is difficult to manufacture such a product to have a uniform physical property as a whole, and even after it is manufactured, the metal in whole or in part. There is a problem that the microstructure or physical properties of the can change, the reliability of the properties is low.

In addition, in the porous metal material according to the related art, a void is formed on the front surface, and in order to have no void on a specific surface, a method of adding or welding a separate member or depositing and fixing the surface to a molten metal is fixed. Secondary processing is required such as a method, a method of melting a high temperature limited to a surface to fill voids, and a vapor deposition method using sputtering on the surface.

The present invention has been made to solve the above-described problems of the prior art, by varying the size and density (distribution vs. cross-sectional area) of the pore formation and the desired physical properties such as the degree of lightening or mechanical strength, The present invention provides a porous metal material having a hierarchical cell structure and a method of manufacturing the same so that the microstructure of the constituting metal and its properties can be stably maintained.

In addition, the present invention is to provide a porous metal material having a hierarchical cell structure such that the formation direction of the voids in one direction, and the side of the void formation direction of the appearance of the product has a closed structure and a method of manufacturing the same.

Method for producing a porous metal material having a hierarchical cell structure according to the present invention for achieving the above object, (a) using a core material and a coating metal material rod-shaped specimens of the core material wrapped around the coating material Producing step; (b) collecting a plurality of rod-shaped specimens to form a first bundle, and extruding the first bundle in the longitudinal direction of the rod-shaped specimen filling the inside thereof to produce a heterogeneous composite material in which the rod-shaped specimens are hierarchically distributed. Making; And (c) removing the core material from the heterogeneous composite material.

In addition, the manufacturing method of the rod-shaped specimen in the step (a) is preferably selected from any one of the extrusion, casting, clad method.

And, according to the selection of the weight ratio of the core material and the coating metal material in the step (a) it is possible to adjust the distribution density of the pores by the removal of the core material in the step (c), in the step (a) By adjusting the weight ratio of the core material and the coating metal material by forming at least one hole in the covering metal material of the prepared rod-shaped specimens to adjust the distribution density of the voids by removing the core material in step (c). You may.

In addition, in the step (a), the rod-shaped test piece is one in which the core material or the metal coating material is plastically deformed through any one of rolling, extrusion, drawing, drawing, forging, and pressing. The rod-shaped specimens made of the core material or the coating metal material subjected to the plastic deformation process may be manufactured by the extrusion process of step (b) and the step of removing the core material through the step (c). It is also possible to control the mechanical stiffness of the finished product, including the relation of the thickness of the metal material.

In addition, by adjusting any one or more conditions of the extrusion ratio conditions, extrusion pressure conditions and heating temperature conditions in the container in the extrusion process of step (b) of the heterogeneous including the bonding strength of the core material and the coating metal material or the thickness of the rod-shaped specimens You can also control the thickness of the composite.

In the step (b), the first bundle of rod-shaped specimens may be provided with a tubular first case that can be inserted into a container for extrusion, and the plurality of rod-shaped specimens may have a lengthwise direction of the first case. It is preferable to inject it into the tube forming direction and to fill it. In step (b), the heterogeneous composite material is preferably extruded so that the tube forming direction of the first case is the same as the extrusion direction.

In addition, a tubular second case that can be introduced into the container for extrusion of the step (b) is provided, and a plurality of the heterogeneous composite materials obtained through the step (b) have a longitudinal direction in the second case. Forming into a second bundle by inserting in a tube forming direction to fill the inside thereof; The second bundle may be further provided to produce a heterogeneous multi-material in which the heterogeneous composite materials are hierarchically distributed by extruding the tube forming direction of the second case in the same direction as the extrusion direction.

In addition, the second bundle may be formed by filling the rod-shaped specimens and the number ratio of the dissimilar composite materials and the arrangement of the second bundles in the second case.

Another method for producing a porous metal material having a hierarchical cell structure according to the present invention for achieving the above object is (A) using a core material and a coating metal material, the core material is wrapped in a rod-like form Manufacturing into specimens; (B) providing a tubular first case, and filling the plurality of rod-shaped specimens in a longitudinal direction thereof in a tube forming direction of the first case to form a bundle; (C) continuously rolling the bundle in its longitudinal direction to produce the rod-shaped specimens of a heterogeneous composite material having a uniform size and distributed hierarchically; And (D) removing the core material from the heterogeneous composite material.

In addition, the rod-shaped specimen prepared before the step (c) or (D), further comprising the step of cutting one end and the other end in the longitudinal direction of the heterogeneous composite material, the heterogeneous multi-material the rod-shaped specimen, the heterogeneous The composite material of, it is preferable to make only the part having a hierarchical structure composed of the heterogeneous multi-materials.

In addition, the method of removing the core material in the step (c) or step (D) may be performed in a solution or gaseous atmosphere that does not react with the coating material but reacts to melt or decompose the core material. It is desirable to remove.

On the other hand, the porous metal material having a hierarchical cell structure according to the present invention for achieving the above object is made by one of the above methods.

According to the present invention as described above, the rod-shaped specimens, heterogeneous composite materials and heterogeneous multi-materials are oriented in the product to form a hierarchical cross-sectional distribution, and by forming a void by removing the manufactured male core material by controlling various conditions Since the size and density (distribution of porosity to cross-sectional area) can be varied along with the direction of, it is possible to obtain a porous metal material having a hierarchical cell structure having a desired physical property level such as weight reduction or mechanical strength.

In addition, the porous metal material having the hierarchical structure thus produced has an effect of stably maintaining the microstructure of the constituting metal and its properties, thereby increasing the reliability of product use.

In addition, the present invention is formed in one direction of the pore forming direction of the product is formed in a closed structure side of the pore forming the structure can be omitted because of the additional processing, such as artificial bone of a metal material through such a structure Likewise, it has the advantage of increasing its applicability to various products.

1 is a schematic diagram illustrating a manufacturing process of a porous metal material having a hierarchical cell structure according to an exemplary embodiment of the present invention.
2 is a schematic diagram illustrating a manufacturing process of a porous metal material having a hierarchical cell structure according to another exemplary embodiment of the present invention with reference to the description of FIG. 1.
3 is a drawing substitute photograph showing a product of a metal material having a hierarchical cell structure according to an embodiment of the present invention.
4 is a flowchart illustrating a manufacturing process of a metal material having a hierarchical cell structure according to an embodiment of the present invention.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, but the inventor may appropriately define the concept of the term to describe its invention in the best way Can be interpreted as meaning and concept consistent with the technical idea of the present invention.

It should be noted that the embodiments described in this specification and the configurations shown in the drawings are merely preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It should be understood that various equivalents and modifications may be present.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

In the manufacturing process of the porous metal material having a hierarchical cell structure according to an embodiment of the present invention, as shown in FIG. 1 or 4, the core material 10 and the coating metal material 12 are rod-shaped specimens 16. ) To go through the process of manufacturing (step (a)).

As described above, the rod-shaped specimen 16 is formed of a core material 10a obtained by processing the core material 10 into a rod shape having a length, and the side portion of the core material 10a is a covering metal material. It forms the shape covered by the tube material 12a which consists of (12).

In other words, the rod-shaped specimen 16 forms a shape in which the core material 10 is filled with the core material 10a in the tube material 12a made of the tubular coating metal material 12.

The method of manufacturing the rod-shaped specimen 16 is inserted into the extrusion container in the longitudinal direction with the core member 10a, which is the core member 10, inserted into the tube member 12a made of the tubular coating metal member 12. After the extrusion can be made in the longitudinal direction.

In addition, another method of manufacturing the rod-shaped specimen 16 is to fill the molten core material 10 in the tube material 12a made of a tubular coating metal material 12, or to have a rod shape having a length. The core metal 10 is placed in a mold (not shown) using the core material 10a, and the coating metal material 12 melted by an insert injection method or a casting method is formed into a tube shape 12a outside the core material 10a. It can also be formed by covering and fixing.

According to the preferred method of manufacturing the rod-shaped specimen 16 described above, as shown in FIG. 1, the plate-like coating metal material 12 is bonded to one surface of the core material 10 having a generally plate shape, and the The method of manufacturing through the conventional cladding method which rolls at high temperature through the rolling mill 14 is mentioned.

The rod-shaped specimen 16 manufactured as described above may be subjected to various intermediate treatment processes to form desired physical properties of the porous metal material having a hierarchical cell structure to be produced later.

As an example of the intermediate treatment process for the rod-shaped specimen 16 described above, the weight ratio adjusting method for relatively selectively applying the weight or volume of the core material 10 and the coating metal material 12 constituting the rod-shaped specimen 16. Or a volume ratio adjustment method.

The weight ratio adjustment method or the volume ratio adjustment method above, in forming the space occupied by the core material 12 through the removal of the core material 10 during the process described later, the diameter size of the voids or each void It is for adjusting the thickness of the coating metal material 12 which forms the cell wall between.

In this regard, the physical properties of the porous metal material, which is a finished product according to the present invention, the weight ratio of the core material 10 and the coating metal material 12 in the total weight of one rod-shaped specimen 16 is the same as that of the core material 10 In the case where the weight of the coating material 12 is made relatively larger than), the gap formed by the removal of the core material 10 is smaller than the diameter of the comparison object, and the thickness of the cell wall made of the coating metal material 12 is relatively It is formed thicker than the comparative object, so the porosity of the finished product is less, the mechanical rigidity due to the thickness of the cell wall is further improved, and the total weight of the finished product creates a difference that is relatively heavy than the comparative object.

Contrary to the above, the weight of the coating material 12 is higher than that of the core material 10 while comparing the weight ratio of the core material 10 and the coating metal material 12 among the total weight of one rod-shaped specimen 16 to be compared. In the case where the thickness is relatively small, the gap formed by the removal of the core material 10 is larger than the diameter of the comparison object, and the thickness of the cell wall made of the coating metal material 12 is formed to be thinner than the comparison object, so that the voids in the finished product are reduced. The distribution ratio occupies a lot, the mechanical rigidity due to the thickness of the cell wall is weakened, and the total weight of the finished product has a difference that is relatively lighter than that of the comparison object.

Here, even when at least one or more holes are formed in the pipe member 12a made of the coating metal material 12 in the rod-shaped specimen 16, the coating material than the core material 10 at the total weight determined above according to the formation rate of the holes. The same or similar result as the case where the relative weight ratio of (12) is made smaller is obtained.

In addition, as another embodiment of the intermediate treatment process for the rod-shaped specimen 16, any one of the core material 10 or the coating metal material 12 in step (a) described above is rolled, extruded, drawn, drawn The rod-shaped specimen 16 may be manufactured by plastic deformation through any one of processes such as line, forging, torsion, and pressing.

The rod-shaped specimen 16 made of the core material 10 or the coating metal material 12 subjected to the plastic deformation process is removed through the extrusion process and step (c) described later. It is also possible to control the mechanical stiffness of the finished product, including the size of the pores according to, the thickness of the cell wall by the coating metal material 12.

That is, in the case where the core material 10 is plastically deformed and the coating metal material 12 is plastically deformable, and the rod-shaped specimen 16 is produced, the core material by extrusion in step (b) described later. The volume reduction ratio of (10a) is relatively smaller than the reduction ratio of the pipe member 12a compared with the case where the core material 10 and the coating metal material 12 are both plastically deformed or both are not applied. It is small, which results in a larger pore size and a lower mechanical stiffness level in the final finished product compared to the above reference conditions.

On the other hand, if the core material 10 is plastically deformed and the covering metal material 12 is plastically deformable, and the rod-shaped specimen 16 is manufactured, the gap between the voids and the above standard conditions in the finished product will be determined. This results in smaller size and higher mechanical stiffness levels.

On the other hand, after the above-described step (a), a plurality of rod-shaped specimens 16 to be produced are collected to form a first bundle 16a, after which the first bundle 16a is longitudinally in the extrusion container 20. After the injection, the cross-sectional shape ejected by extruding in the longitudinal direction is made of heterogeneous composite material 28 in which the cross-sections of the rod-shaped specimens 16 having a reduced diameter are hierarchically distributed (step (b)). .

Adjusting any one or more of the extrusion ratio conditions, the extrusion pressure conditions and the heating temperature conditions in the container in the extrusion process of step (b) described above is the thickness of the heterogeneous composite material 28 including each rod-shaped specimen 16 And mechanical stiffness and production speed accordingly are controlled.

As an example of this, the above-described extrusion ratio conditions, the overall thickness of the heterogeneous composite material 28 and each of the rod-shaped specimens 16 of which the heterogeneous composite material 28 and the hierarchical distribution / arrangement structure therein Determine the thickness of the field.

In addition, the appearance shape of the heterogeneous composite material 28 is determined by the extrusion die 22 provided at the tip of the extrusion container 20.

In addition, in the above-mentioned conditions, the extrusion pressure is a condition that the temperature conditions in the extrusion container 20 are the same, and when the extrusion pressure is increased, the mechanical strength according to the plastic deformation of the coating metal material 12 as well as the core material 10 is increased. Since the relationship is improved, the mechanical strength of the finished product can be controlled by controlling the extrusion pressure.

In addition, the heating temperature condition in the container among the above-mentioned conditions is that when the extrusion pressure is the same, when the heating temperature in the container is increased, the production speed of the extruded heterogeneous composite material 28 is improved, and vice versa. The lower the level of the former, the lower the level of the mechanical strength of the finished product.

Here, the first bundle 16a described above provides a tubular first case 18a that can be inserted into the container described above, and longitudinally moves a plurality of rod-shaped specimens 16 into the first case 18a. It is more effective that the first casing 18a is filled in the tube forming direction.

Thus, the alignment of the rod-shaped specimen 16 and the first case 18a coincides with the direction of extruding again in the above-described extrusion process, which is the first case 18a in the longitudinal direction of the heterogeneous composite material 28. The rod-shaped specimens 16 are in one direction so that the voids formed through the removal of the core material 10 later are neatly formed in one direction.

If the extrusion directions of the rod-shaped specimen 16, the first case 18a, the ram 24, and the pressure plate 26 do not coincide, the core material 10 and the coating metal material 12 are extruded. And the first case 18a are mixed with each other and extruded, and this mixed and extruded forms a state in which it is impossible to remove the core material 10 later.

After the extrusion process described above, a tubular second case 18b that can be introduced into the extrusion container 20 is provided, and the rod-shaped specimens 16 obtained through step (a) and the step (b) obtained are obtained. The heterogeneous composite materials 28 may have a desired number ratio and arrangement relationship, and the second bundle 18a may be formed by filling the second case 18b in the lengthwise direction thereof to fill the interior thereof.

Thereafter, the second bundle 28a formed through the above process is inserted into the extrusion container 20 so that the extrusion direction and the longitudinal direction are the same as the extrusion process of the first bundle 16a mentioned above, and then extruded. Heterogeneous multimaterials 32a to 32n are fabricated with an already designed hierarchical distribution of rod-shaped specimens 16 or a uniform hierarchical distribution of heterogeneous composite materials 28.

Here, the second case 18b may be the same as the first case 18a described above, and in the process of forming the second bundle 28a, the rod-shaped specimens 16 and the heterogeneous composite materials 28 may be formed. Filled with only the heterogeneous composite materials 28 for the second case 18b of the number ratio, the heterogeneous multimaterial 32a corresponding to the first type (type1) of the heterogeneous multimaterials 32a to 32n of FIG. Is formed.

In addition, the first bundle 16a made of rod-shaped specimens 16 and the second bundle 28a made of heterogeneous composite materials 28, as shown in FIG. 1, have a single extrusion container 20. In addition to the method of collecting a bundle produced by the extrusion using will be able to form through the co-extrusion die 30 by the co-extrusion method having a plurality of extrusion containers 20 will be natural.

In addition, the above-described extrusion process, by adjusting the desired number ratio and arrangement relationship between the plurality of rod-shaped specimens 16, the plurality of different composite materials 28 and the heterogeneous multi-materials (32a to 32n) is another It will be appreciated that the formation of the bundles can then be carried out further and repeatedly, including a series of processes to extrude them.

The heterogeneous multi-materials 32a to 32n prepared after the step (b) above are removed by cutting the front end and the other end which are not formed in a uniform hierarchical structure in the extrusion process before the step (c) described later. Will do more.

The heterogeneous multimaterials 32a to 32n obtained therefrom are hierarchically formed by the rod-shaped specimens 16 or the heterogeneous composite materials 28 distributed in a previously designed arrangement in which parts having the same category of physical properties are layered. .

After the above-mentioned step (b), the heterogeneous multimaterials 32a to 32n do not react with the coating material 12 and form a solution or gaseous environment in which only the core material 10 is dissolved or decomposed. No)) to remove only the core material 10 (step (c)).

In the above-described hierarchical structure, as the heterogeneous multimaterials 32a to 32n are represented in FIG. 1, the heterogeneous composite materials 28 fabricated through the same process in the cross-section are generally uniform in size. It has the same physical properties, and these heterogeneous composite materials 28 are called a hierarchical structure by referring to a batch relationship including a number ratio.

This definition of hierarchical structure will be applied to each rod-shaped specimen 16 constituting the heterogeneous composite material (28).

On the other hand, in the method of manufacturing a porous metal material having a hierarchical cell structure according to a modified embodiment of the present invention, as mentioned in the above-described embodiment, the core material (0) and the coating metal material 12 is rod-shaped specimen In the step (A) of manufacturing (16), a tubular first case 18a is provided, and a plurality of rod-shaped specimens 16 are filled in the longitudinal direction of the first case 18a by filling in the tube forming direction of the first case 18a. (B) forming a bundle by making a bundle; The bundle thus formed is continuously rolled in its longitudinal direction to produce a composite material of different types having hierarchically distributed rod-like specimens, and to remove the core material from the heterogeneous composite material obtained through the above process. It is made, including.

Here, the modified embodiment of the present invention has a difference in the relationship produced by the rolling method instead of the extrusion method when compared with the above-described embodiment, and the other processes will be said to be in the same or the same category, so the detailed description thereof will be omitted. Let's do it.

The implementation process of the present invention mentioned above will be described in detail.

First, as shown in FIG. 1 or FIG. 4, the core material 10 and the coating metal material 12 are prepared (ST110), and these core materials 10 and the coating metal material 12 are mutually bonded together. The rod-shaped test piece 16 which makes the core material 10 the core material 10a and the coating metal material 12 the pipe material 12a is produced by the cladding method (ST120) (ST130).

The first bundle 16a is formed by filling a plurality of rod-shaped specimens 16 produced in such a manner as to fill the tube forming direction of the first case 18a (ST140), and the temperature is 200 to 300 ° C, Extrusion or co-extrusion is carried out by filling the length direction of the first bundle 16a into the extrusion direction by the ram 24 and the pressure plate 26 in the extrusion container 20 having an extrusion ratio of 15 to 20 and an extrusion angle of 40 to 50. The heterogeneous composite material 28 is produced by performing (ST150).

From this, the specimens of the heterogeneous composite material 28 obtained through the extrusion die 22 or the co-extrusion die 30 installed in the extrusion container 20 are filled again in the tube forming direction of the second case 18b. The second bundle 28a may be formed by filling the second bundle by forming a second bundle, or by placing the heterogeneous composite materials 28 and the rod-shaped specimens 16 in the second case 18b including a number ratio and a placement relationship. (ST160) (ST170).

The second case 18b filled with the second bundle 28a is made of heterogeneous multimaterials 32a to 32n again through an extrusion or coextrusion process (ST180). The heterogeneous multi-materials 32a to 32n are made of a porous metal material having a hierarchical cell structure by removing the core material 10 forming the internal filament shape after removing unnecessary tips and other ends (ST190).

Here, the above-described removal process of the core material 10, the core material 10 is made of aluminum material, the coating metal material 12 is made of a copper material of the heterogeneous multi-materials (32a to 32n) hydrogen chloride ( HCL) may be introduced as an example of the method of being introduced into a chamber (not shown) in which gas is filled or flowed or injected into a container containing hydrochloric acid.

Since the porous metal material is cut into the required shape or has a process to be completed as a desired product through a subsequent process such as surface treatment (ST200).

The rod-shaped specimen 16 or the heterogeneous composite material 28 according to the clad method described above is preferably manufactured in a hexagonal rod shape having a hexagonal cross-sectional shape, and the first specimen comprising these rod-shaped specimens 16. Second bundle 28a made of bundle 16a and heterogeneous composite materials 28 or rod-shaped specimens 16 and heterogeneous composite material 28 and first and second cases 18a and 18b to which they are fitted. It is preferable that each cross section of) has a hexagonal shape.

In addition, the above-described extrusion container 20 and the extrusion die 22 is preferably produced in a hexagonal cross-section, and manufacturing in this hexagonal shape, the adjacent rod-shaped specimen (16) in the bundle forming process for extrusion ) Or to reduce the voids between the heterogeneous composite materials 28 and to facilitate the formation of a uniform and stable hierarchical structure from the center of the cross section.

10: core material 12: coating metal material
14, 34: mill 16: rod specimen
18a, 18b: case 20: extrusion container
22: extrusion die 24: ram
26: pressure plate 28: heterogeneous composite material
30: coextrusion die 32: heterogeneous multi-material

Claims (15)

(a) fabricating the core material into rod-shaped specimens in which the coating metal material is wrapped using a core material and a coating metal material;
(b) collecting a plurality of rod-shaped specimens to form a first bundle, and extruding the first bundle in its longitudinal direction to produce a heterogeneous composite material in which the rod-like specimens are hierarchically distributed; And
(c) removing the core material from the heterogeneous composite material;
Method for producing a porous metal material having a hierarchical cell structure comprising a.
The method of claim 1,
Method for producing a rod-shaped specimen in the step (a) is a method of manufacturing a porous metal material having a hierarchical cell structure, characterized in that any one of extrusion, casting, clad method.
The method of claim 1,
Porous metal material having a hierarchical cell structure, characterized in that the distribution density of the pores due to the removal of the core material is adjusted in step (c) according to the selection of the weight ratio of the core material and the coating metal material in step (a). Manufacturing method.
The method according to claim 1 or 3,
By forming at least one hole in the coating metal material of the rod-shaped specimen prepared in step (a) to adjust the weight ratio of the core material and the coating metal material, the void by removing the core material in step (c). A method for producing a porous metal material having a hierarchical cell structure, characterized in that the distribution density of is controlled.
The method of claim 1,
In the step (a), the rod-shaped specimen is one in which the core material or the metal coating material is plastically deformed through any one of rolling, extrusion, drawing, drawing, forging, twisting and pressing. Method for producing a porous metal material having a hierarchical cell structure characterized in that it is produced by.
The method of claim 1,
The thickness of the heterogeneous composite material including the thickness of the rod-shaped specimen and the mechanical stiffness thereof are adjusted by adjusting any one or more of the extrusion ratio condition, the extrusion pressure condition, and the heating temperature condition in the container in the extrusion process of step (b). Method for producing a porous metal material having a hierarchical cell structure, characterized in that.
The method of claim 1,
In the step (b), the first bundle of rod-shaped specimens may be provided with a tubular first case that can be inserted into a container for extrusion, and the plurality of rod-shaped specimens may be formed in the lengthwise direction of the tube of the first case. Method for producing a porous metal material having a hierarchical cell structure characterized in that it is filled in the direction.
The method of claim 7, wherein
The heterogeneous composite material in the step (b) is a method for producing a porous metal material having a hierarchical cell structure, characterized in that the first tube case is formed in the same direction as the extrusion direction.
The method of claim 7, wherein
A tube-shaped second case which can be put into the container for extrusion of the step (b) is provided, and a plurality of the heterogeneous composite materials obtained through the step (b) are formed in the length direction of the tube in the second case. Forming a second bundle by injecting in a direction to fill the interior thereof; And extruding the second bundle so that the pipe forming direction of the second case is the same as the extrusion direction to produce a heterogeneous multimaterial having hierarchically distributed heterogeneous composite materials. A method for producing a porous metal material having a structure.
The method of claim 9,
The second bundle is a method of manufacturing a porous metal material having a hierarchical cell structure, characterized in that the arrangement of the number of the rod-shaped specimens and the heterogeneous composite materials and the arrangement between each other in the second case.
(A) using the core material and the metal coating material to produce the core material as a rod-shaped specimen wrapped in the metal coating material;
(B) providing a tubular first case, and filling the plurality of rod-shaped specimens in a longitudinal direction thereof in a tube forming direction of the first case to form a bundle;
(C) continuously rolling the bundle in the longitudinal direction to produce a heterogeneous composite material in which the rod-shaped specimens are hierarchically distributed; And
(D) removing the core material of the heterogeneous composite material;
Method for producing a porous metal material having a hierarchical cell structure comprising a.
12. The method according to any one of claims 1 to 11,
Hierarchical cell, characterized in that further comprising the step of cutting one end and the other end in the longitudinal direction of the rod-shaped specimen, the heterogeneous composite material, the heterogeneous multi-material prepared before step (c) or (D) A method for producing a porous metal material having a structure.
The method according to any one of claims 1 to 11,
The method of removing the core material in the step (c) or (D) is to remove the core material in a solution or gaseous atmosphere that does not react with the coating material but reacts to melt or decompose the core material. A method for producing a porous metal material having a hierarchical cell structure, characterized in that.
A porous metal material having a hierarchical cell structure produced according to any one of claims 1 to 10.
A porous metallic material having a hierarchical cell structure produced by the method of claim 11.

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