KR20130052208A - Open type porosity metal and method for producing the same - Google Patents
Open type porosity metal and method for producing the same Download PDFInfo
- Publication number
- KR20130052208A KR20130052208A KR1020110117524A KR20110117524A KR20130052208A KR 20130052208 A KR20130052208 A KR 20130052208A KR 1020110117524 A KR1020110117524 A KR 1020110117524A KR 20110117524 A KR20110117524 A KR 20110117524A KR 20130052208 A KR20130052208 A KR 20130052208A
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- KR
- South Korea
- Prior art keywords
- metal
- salt
- mold
- base material
- cell structure
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/04—Casting aluminium or magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/08—Alloys with open or closed pores
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
The present invention relates to a method of manufacturing an open porous metal having a uniform cell structure for forming an open porous structure in a metal so as to be used as a structural member for automobiles and a collision member, and an open porous metal produced therein.
In general, porous metal is not only used as a fancy product or a noble metal product as a precious metal product, but also in a fuel cell field of a hydrogen automobile, such as a sparger, a gas filter, or an electrolytic cell for the addition of gaseous water. The porous metal can be used as membrane supports, and its porous metals have excellent mechanical and structural strength, but also have the ability to adsorb by numerous pores.
As the most representative example of producing the porous metal as described above, the powder mass in the state in which the powder mass containing the fine metal powder or the fine metal yarn alone or mixed is introduced into the molding surface of the press mold or the hydraulic press. After pressing to primary shape to the required shape, and then, the primary molded pre-formed in the sintering furnace to be heated and sintered to a predetermined temperature, the overall porosity (10) ~ 20% It is to prepare a metal sintered body.
However, metal powder or micrometallic yarn, which is a material for a conventional porous metal, is manufactured through a difficult and complicated process of fine-spraying the molten metal into a space set under cooling conditions while melting the metal. There was a problem that the time and cost of the metal powder or the fine metal yarn to be increased unnecessarily, due to this, the manufacturing cost of the porous metal produced by the metal powder or the fine metal yarn was also unnecessarily increased.
In addition, even in the process of primarily manufacturing the preform by pressing the metal powder or fine metal yarn in a press apparatus, the metal powder or the fine metal yarn components cannot be closely connected structurally or mechanically, In order to secure the strength of the preform, a mixture of binders or binders for bonding metal powders or fine metal yarns is used, so that the cost increases as well as the porosity formed by the metal powders or fine metal yarns. There was a problem of being lowered by the binder component.
Even if a binder or a caking agent is used to pressurize the metal powder or the fine metal yarn as described above to produce a preform, the metal powder or the fine metal yarn particles are not organically and firmly linked, so that a press apparatus is used. It is possible to produce a preform of the required strength only by pressurizing, thereby making it difficult to produce the preform and the porous metal.
In addition, even when the preform is sintered to produce a porous metal, when the melting temperature of the binder or the binder becomes higher than the melting temperature of the metal powder or the fine metal yarn, the preform is prepared until immediately before the melting temperature of the binder or the binder. In the heating process, there is a problem in that the metal powder or the fine metal yarn is pre-melted and agglomerated into a lump of a certain size, and thus the structure of the pores formed in the porous metal is very simple.
The present invention forms an open porous cell in a metal to be used as a structural member and a collision member for automobiles, thereby securing the reliability of physical properties when applying parts because of excellent uniformity of mechanical properties compared to a metal used as a structural member and a collision member for automobiles. It is an object of the present invention to provide an open porous metal manufacturing method and a method of manufacturing the open porous metal having a uniform cell structure to realize a cost reduction together.
An open porous metal manufacturing method having a uniform cell structure according to the present invention for achieving the above object comprises the steps of preparing a metal base material used as an open porous base material; Preparing a mold that is not reactive with the metal base material; Preparing a salt ball of the same size as the metal base material; Dissolving the metal base material in a mold and charging salt balls; Cooling the molten metal in the mold: removing the cooled metal from the mold; Removing salt balls of the metal stripped from the mold;
The mold is any one of sand, carbon, gypsum, or a mixture of two or more thereof. The salt ball is a spherical shape of a nonmetallic salt. The size of the salt ball is 5 to 15 mm in diameter, and the salt ball is sodium chloride. (NaCl).
The dissolution temperature of the metal base material is 800-950 ° C, and the dissolution of the metal base material is in an inert atmosphere by a vacuum of 10 -3 Torr or an inert gas.
The cooling of the molten metal is cooled to within 10 ° C./min up to 400 ° C. in the furnace, and then drawn out to the outside of the furnace and cooled down to room temperature. The removal of salt from the metal is performed by immersing the metal in water to dissolve and remove the salt. The temperature of the water which melt | dissolves is 40-60 degreeC.
The metal base material is either aluminum or an aluminum alloy.
In addition, the present invention is to form an open porous cell in the metal, the metal is any one of aluminum or aluminum alloy, the shape of the cell is spherical, the size of the cell is 5-15mm in diameter.
Open porous metal having a uniform cell structure of the present invention having the structure as described above is formed, there is an effect that can achieve a significant cost reduction while securing physical properties reliability when used as a structural material and a collision member for automobiles.
1 is a schematic diagram schematically showing a method for producing an open porous metal having a uniform cell structure according to the present invention;
2 is a configuration diagram of a metal base material used as an open porous metal material in the furnace and dissolved state,
3 is a block diagram of a state in which the salt ball prepared in the container of the present invention is accommodated,
4 is a block diagram of a state in which the molten metal and salt filling in the mold of the present invention,
5 is a block diagram of a state in which the metal base material containing the salt ball of the present invention is cooled,
Figure 6 is an enlarged view of a part of the removal of the salt sphere from the metal base material containing the salt sphere of the present invention.
Hereinafter, with reference to the accompanying drawings will be described in detail an open-type porous metal manufacturing method having a uniform cell structure and a method for manufacturing the open-type porous metal according to a preferred embodiment of the present invention.
FIG. 2 of the present invention shows a state in which a metal base material used as an open porous metal material is charged into a furnace and dissolved, and the furnace may use either an electric furnace or a high frequency induction furnace.
At this time, a metal base material used as an open porous metal material is charged in the furnace (electric furnace or high frequency induction furnace) to dissolve using heat. The dissolution temperature is preferably 800-950 ° C, and the dissolution time is 60. It is preferable to set it within minutes.
The reason for this is that the melting time is delayed too much below 800 ° C, and if the heating time exceeds 950 ° C or the melting time exceeds 60 minutes, the melting temperature of the metal base material may be lowered, because the characteristics and yield of inclusions in the molten metal may be lowered. It is preferable to set it as 950 degreeC.
When dissolving the metal base material, dissolution of the metal base material is preferably dissolved in a vacuum state of 10 -3 Torr or in an inert atmosphere by inert gas (Ar), because the formation of inclusions in the molten metal is prevented. To suppress it.
When dissolution of the metal base material is completed as described above, the molten molten metal and salt balls are charged into the mold and mixed as shown in FIG. 4. At this time, the mold uses any one or two or more of the sand, carbon, gypsum, which is not reactive with the molten metal base material.
In addition, it is preferable to use aluminum (Al) or an aluminum alloy as the metal base material, because it is not reactive with salt, and is considered in light weight, impact absorption and economical efficiency.
The salt balls are spherical ones made of non-metallic salts, because the salt balls are used to facilitate the removal of the salt balls described below, as well as having no reactivity with the aluminum (Al) or the aluminum alloy. .
The size of the salt sphere is 5-15mm in diameter, and the salt sphere is made of sodium chloride (NaCl) because the salt sphere is easily dissolved by immersion in water when the salt sphere is removed to form a porous cell. This is because the cell is easily formed.
In addition, the size of the salt ball is 5 to 15mm, the reason is that when the smaller than 5mm, the occurrence of defects in the porous cell due to the flowability of the molten metal is increased, and the mechanical properties of the porous metal which is the object of the open type of the present invention if it exceeds 15mm Since the problem of sharply lowering occurs, it is preferable to set the size of the salt ball to 5-15 mm.
The temperature of the water for dissolving (dissolving) the salt balls is preferably 40 to 60 ° C. The reason for this is that when the temperature of the water is less than 40 ° C, the salt dissolves longer and the productivity decreases. This is because it can react with the surface to accelerate unwanted corrosion. Therefore, the temperature of the water which melts | dissolves (dissolves) a salt ball is 40-60 degreeC is preferable.
On the other hand, the cooling of the molten metal in the mold is cooled to within 10 ° C./min up to 400 ° C. in the furnace, for the purpose of suppressing rapid shrinkage and solidification of the metal base material, that is, the molten metal. The furnace is slowly cooled to 400 ° C., after which the metal is taken out of the furnace and cooled to room temperature.
When the cooling of the metal material is completed as described above, the metal material is removed from the mold, and the stripped metal material is immersed in water of 40-60 ° C as described above to remove salt balls.
After all of the above processes are completed, an open porous cell (space) is formed in the metal material as shown in FIG. 6, and the porous cell becomes a cell having a size and shape corresponding to the size and formation of salt balls.
The metal material of the present invention is aluminum or an aluminum alloy, and in the present invention, any metal other than the aluminum or aluminum alloy may be used.
The open-type porous metal having a uniform cell structure manufactured by the present invention as described above has the advantage of achieving cost savings while securing the reliability of physical properties when used as an automobile structural material and a collision member.
Claims (7)
Preparing a mold in which any one or two or more of sand, carbon, gypsum, and the like are mixed so as not to be reactive with the metal base material;
Preparing a spherical salt ball of a non-metal salt and forming a porous cell of the metal base material;
Dissolving the metal base material in an inert atmosphere by an inert gas using a furnace;
Charging the dissolved molten metal and the prepared salt balls into the prepared mold;
Cooling the mold and removing metal from the cooled mold;
Removing the salt sphere of the metal material stripped from the mold; Open porous metal manufacturing method having a uniform cell structure, characterized in that consisting of.
The size of the salt sphere, the open porous metal manufacturing method having a uniform cell structure, characterized in that 5 to 15mm in diameter.
The dissolution temperature of the metal base material is 800-950 ℃ open porous metal manufacturing method having a uniform cell structure, characterized in that.
The dissolution of the metal base material, the open porous metal manufacturing method having a uniform cell structure, characterized in that in the vacuum of 10 -3 Torr.
The cooling of the molten metal in the mold is an open porous metal manufacturing method having a uniform cell structure, characterized in that cooling to within 400 ° C within 10 ° C / min, and then drawn out of the furnace to cool to room temperature.
Removing salt of the metal is an open porous metal manufacturing method having a uniform cell structure, characterized in that the salt is dissolved by removing the metal by immersing the metal in water.
The temperature of the water to dissolve the salt ball, 40-60 ℃ characterized in that the open porous metal manufacturing method having a uniform cell structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110117524A KR20130052208A (en) | 2011-11-11 | 2011-11-11 | Open type porosity metal and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110117524A KR20130052208A (en) | 2011-11-11 | 2011-11-11 | Open type porosity metal and method for producing the same |
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| KR20130052208A true KR20130052208A (en) | 2013-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020110117524A KR20130052208A (en) | 2011-11-11 | 2011-11-11 | Open type porosity metal and method for producing the same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9382601B2 (en) | 2013-12-13 | 2016-07-05 | Hyundai Motor Company | Method of producing porous aluminum |
| WO2017171510A1 (en) * | 2016-04-01 | 2017-10-05 | 주식회사 엘지화학 | Method for producing metal foam |
| KR20200142224A (en) | 2019-06-12 | 2020-12-22 | 현대자동차주식회사 | Shock absorption bumper and manufacturing method thereof |
| US11298745B2 (en) | 2016-04-01 | 2022-04-12 | Lg Chem, Ltd. | Method for manufacturing metal foam |
-
2011
- 2011-11-11 KR KR1020110117524A patent/KR20130052208A/en not_active Application Discontinuation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9382601B2 (en) | 2013-12-13 | 2016-07-05 | Hyundai Motor Company | Method of producing porous aluminum |
| WO2017171510A1 (en) * | 2016-04-01 | 2017-10-05 | 주식회사 엘지화학 | Method for producing metal foam |
| US11298745B2 (en) | 2016-04-01 | 2022-04-12 | Lg Chem, Ltd. | Method for manufacturing metal foam |
| KR20200142224A (en) | 2019-06-12 | 2020-12-22 | 현대자동차주식회사 | Shock absorption bumper and manufacturing method thereof |
| US11364862B2 (en) | 2019-06-12 | 2022-06-21 | Hyundai Motor Company | Shock absorption bumper and manufacturing method thereof |
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