JPS6089534A - Manufacture of porous aluminum - Google Patents

Abstract

PURPOSE:To manufacture inexpensively porous Al having superior mechanical properties by cladding Al with a thin layer of an Al-Si alloy, cutting the resulting material into chips, putting the cut material in a metallic mold, and heating it in a heating furnace. CONSTITUTION:Al or an Al alloy as a core material is clad with a thin layer of an Al-Si alloy, and the resulting material is cut into chips, fibers or wires. The cut material is degrased and washed with ethanol or coated with a flux, and it is put in a metallic mold of a desired shape. The mold is heated to the liquidus line temp. of the Al-Si alloy + or -10 deg.C in a heating furnace to melt-bond the cut material with the Al-Si alloy. Thus, porous Al having superior mechanical properties such as ductility and contg. no foreign matter is inexpensively obtd. in a short time.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing porous aluminum.

Conventionally, various means have been provided as methods for producing porous gold islands. In other words, the method for producing porous metals by sintering is a method that utilizes the diffusion phenomenon of metal atoms due to external thermal energy at the interface of two contacting powder metals. It takes several hours to carry out this process, and furthermore, the presence of dirt or foreign matter on the contact surface has the disadvantage that the diffusion rate is extremely reduced, the bonding force between metals is weakened, and the mechanical properties are deteriorated.

In addition, as a manufacturing method that utilizes the porosity of other substances, metal is attached to the surface of expanded polystyrene using a surface treatment method such as electrodeposition, and then the expanded polystyrene is burned to obtain a mesh-like porous metal (incineration). Method), or chlorination) Water-soluble particles such as IJum are baked into a predetermined shape, molten metal is injected under pressure into the gaps between the particles, and after solidification, chlorination) I
Method of obtaining mesh-like porous metal by dissolving Jum in water (
However, there is a risk that styrofoam oxides and chloride (IJium) particles may remain inside the porous metal, and since the thickness of the metal body is thin, the mechanical strength is not that of a true porous metal. It's not quality metal.

Furthermore, in a manufacturing method (foaming method) in which a gas-generating substance is placed in the molten metal and pores are scattered inside the metal body, a gas-generating compound such as manesite or hydrides of Ti and Zr is added to the molten metal. , the gas content of the molten metal is supersaturated and solidified to incorporate pores to obtain a porous metal, but there are variations in the location of the pores, and the temperature distribution of the molten metal
In particular, there was a large temperature difference between the bottom of the furnace and the surface of the molten metal, and the solidification rate also depended on the size of the pores, resulting in unstable quality due to the non-uniform presence of pores.

The present invention has been made in view of the above-mentioned conventional drawbacks, and uses aluminum or an aluminum alloy as a core material, clads the surface layer of the core material with a thin Al-Si alloy, and uses this clad material as a wire rod. After cutting into powder, chips, fibers, etc., it is placed in a mold of the desired shape and heated in a heating furnace to the liquidus temperature of the AA-8i alloy. A method of fusing the cut materials described above with AJ-Si alloy, or using aluminum or an aluminum alloy as a core material and applying a thin layer to the surface layer of the core material.
After cladding the kl-Si alloy and cutting the clad material into chips, fibers, lines, etc. and applying Fusix, the material kAl was cut using the same process as described above.
The present invention provides a method for producing porous aluminum that has strong metallic bonding strength and no residual foreign matter by a method of fusing with -8t alloy.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First of all, the principle of the present invention is as shown in FIG. ,
When two or more chips or two or more fibers are mechanically brought into contact so as to be intertwined and the low melting point Kinbin 2 is melted, the intertwined contact points are wedge-shaped due to capillary action, so this wedge-shaped As shown in FIG. 2, the melted metal in the gap aggregates, and the clad metal chips or fibers are bonded together in a metallic manner by the fusion of the low melting point metal 2 on the surface layer.

Next, one embodiment of the present invention will be specifically described based on the above-mentioned principle. A3003 aluminum alloy is used as the upper phase 1 and 2, and one or both sides of the core material 1 are heated at 50°C from the core material 1.
~150°C A metal 2 with a low melting point, such as A4343 aluminum alloy, is crimped and metallically bonded by hot plastic processing such as hot rolling, or a core material 1 is formed by thermal spraying the low melting point metal 2. A clad plate with one glaze welded to the surface of the plate is prepared with a cladding ratio=thickness of core material 1/thickness of metal 2=1 to 1000, and a total plate thickness of 0.05v+yn-2 mm. Here, the composition of the above A3003 aluminum alloy is Mn 1.3%, cuo, io%, Fe
O, 2%, Zn 0.1% (wt%), A4343
The composition of the aluminum alloy is Si7.5%, FeO,15
%, Zn 0.1% (wt%).

The core material 1 is pure aluminum, Al-Mg alloy, hl
-Mn-based alloy, kl -Mg = Si-based alloy, At
-Cu alloy, Al-Zn-Mg alloy, etc. may be used, and the St component of metal 2 may be 3% to 20% (wt%).

Next, the clad material is cut into fibers with a width of 1.0 mm x length of 350 mm using a cutting machine such as a shearing machine, or into square chips of 1.5 mm x 1.5 mm. , Degrease and clean these bare sides with ethyl alcohol.

Furthermore, the above-mentioned fibrous material or chip-like particles are filled into a mold, and when filling the fibrous cable trunk, a pressure device such as a hydraulic press is used to apply a molding pressure of 501 to 10. OOO
Pressure molding is performed using "m".On the other hand, in the case of chip-shaped materials, natural filling is performed.

After filling the material into the molding mold, put the mold into a heating furnace with an inert gas atmosphere and heat it to the liquidus temperature of the low melting point metal 2 ±100, and when the mold reaches the above temperature. After removing the mold from the heating furnace and cooling with forced air (cooling using a fan), the porous aluminum is taken out from the mold.

Before putting the above material into the mold, it was mixed with ethyl alcohol at a ratio of 7 lux t11/100011° of aluminum potassium salt to form a slurry, and the material placed in a gilt copper cup was immersed in this slurry. However, if the material is taken out from the slurry and then dried, the above-mentioned preliminary cleaning of the material becomes unnecessary.

Furthermore, although the above-mentioned heating furnace uses an inert gas atmosphere heating furnace, it may be any one of a normal heating furnace, a vacuum heating furnace, and a combination of an inert gas atmosphere heating furnace and a vacuum heating furnace. Further, as the above-mentioned flux, 7 lux of aluminum potassium salt was used, but any known 7 lux may be used, but it is preferable to use a non-corrosive flux. Although the above-mentioned material was cut into chips or fibers, it may be cut into wires, and the length, width, thickness, etc. may be arbitrary.

Furthermore, the shape of the porous aluminum product is molded into a desired shape such as a circle, square, triangle, or polygon using a mold.

As explained in detail above, since the present invention is the above-mentioned manufacturing method, it has the following effects.

(b) Heating and holding times are shorter than conventional sintering methods, improving productivity and reducing costs.

(b) Mechanical properties, especially high ductility (elongation) - Conventional sintered crystals and foamed metals are brittle and have poor workability, whereas the products obtained by the present invention are ductile and can be processed by bending and cutting. etc. is easy.

(c) In the case of the conventional method, the pore size and porosity depend on the manufacturing method and the effective range is narrow, but according to the present invention, the pore size and porosity can be changed arbitrarily by simply changing the shape of the material, and the control range is wide. .

) Since it has a strong metal bond, it is resistant to heat shock and can be welded, for example.

(E) There is very little foreign matter contamination or foreign matter remaining.

(f) The heat transfer coefficient is improved due to a significant increase in the heat transfer area.

Function) It has electrical conductivity, is highly concentrated and effective.

[Brief explanation of the drawing]

FIGS. 1 and 2 are diagrams of the principle of the present invention. 1... Upper phase, 2... Low melting point metal, A.
...Metal material patent applicant Nippon Light & Metal Co., Ltd. agent Patent attorney Hide Sato Showa procedural amendment (master) Showa 6 GIE, January 24 Commissioner of the Japan Patent Office Manabu Shiga 1, case display 1982 Patent Application No. 197504 2, Name of the invention Process for producing porous aluminum 3, Relationship with the case of the person making the amendment Patent applicant's address and name (474) Nippon Light Metal Co., Ltd. 4, Agent Voluntary amendment 6, Amendment Target specification, 11. ′, 1shi, -0-1, 7, Contents of the amendment r) Q, IL 2”” 7゜As attached [Contents of amendment] (1) Amend the scope of claims column of the specification as shown in the attached sheet do. (2) The "Detailed Description of the Invention" column of the specification shall be amended as shown in the table below. (3) Extract 1 from page 7, line 8 of the specification. ” Insert the following text below. "Due to this heating, the low melting point metal A I-S i is melted and the core material is fused, but when the Al-3i alloy (B) is melted, it has an adhesion effect on the core material 1. Claims (1) A core material made of aluminum or an aluminum alloy, and a thin (A l -S i ) on the surface layer of the core material. After cladding the cladding material with the A I-8i alloy and cutting the clad material into chips, fibers, cotton, etc., it is placed in a mold of a desired shape, and heated to the liquidus temperature of the A I-8i alloy in a heating furnace. ±10
A method for producing porous aluminum, characterized in that the cut material is heated to a temperature of 0.degree. C. and fused with an AI-3i alloy. (2) Aluminum or aluminum alloy is used as the core material, the surface layer of the core material is clad with f"l (A I-3i alloy), and this clad material is cut into chips, fibers, wires, etc. to produce black The material is coated with Ae-Si alloy, put into a mold of a desired shape, and heated in a heating furnace to the liquidus temperature of the Al-3i alloy ±10°C to form the cut material into an Ae-Si alloy. A method for producing porous aluminum, characterized in that the sl of the Al!-S i-based alloy is 3 to 20.
The method for producing porous aluminum according to claim 1 or claim 2, wherein the percentage is by weight. (4) The method for producing porous aluminum according to claim (2), wherein the flux is a KF-AIF-based flux.

Claims (1)

[Claims] flJ The core material is aluminum or an aluminum alloy, and the surface layer of the core material is thin <Al! -clad with Si alloy;
After cutting this clad material into ticks, fibers, lines, etc., it is placed in a mold of a desired shape and heated in a heating furnace to the liquidus temperature of the Al-8t alloy ±10°C. A method for producing porous aluminum, characterized in that cut materials are fused with an Al-Si alloy. (2) Aluminum or aluminum alloy is used as the core material, the surface layer of the core material is clad with a thin AJ-Si alloy, this clad material is cut into ticks, fibers, lines, etc., and flux is applied to it. was put into a mold of a desired shape and heated in a cutting edge heat furnace to the liquid phase powder temperature of the AJ-8t alloy ±1 oc to form the cut material into Al-S.
A method for producing porous aluminum, characterized in that it is fused with an i-alloy. (3) The porous aluminum manufacturing method according to claim 111 or (2), wherein the Ae-8i alloy contains 3 to 20 weight percent of Si. (4) The method for producing porous aluminum according to claim 21, wherein the flux is a KF AlF3-based flux.