JPH06100959A - Material having porous layer - Google Patents

Abstract

PURPOSE:To provide a member provided with the functions of muffling, deodorizing or the like by forming the surface of a Cu-Fe alloy into a porous one. CONSTITUTION:This material is constituted of, by weight, 30 to 70% Fe and 4 to 11% Al and, as selective elements, is added with Cr by <=18% to the Fe content and 0.5 to 1.0% Si, and the balance Cu. It is worked into a thin sheet, parts, member or the like, and after that, the Cu mother phase is selectively corroded to dissolve to remain the Fe phase having a dendrite shape, by which a porous layer having a high surface area is formed on the surface layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material having a porosity most suitable for a carrier for a gas reaction catalyst, a sound absorbing material and a vibration damping material.

[0002]

2. Description of the Related Art A porous metal body literally has many holes, and has many excellent characteristics and various functions as compared with a normal metal having no holes. For example, a sintered metal obtained by compacting and sintering powder is used as an oil-impregnated bearing in all rotary machines by storing lubricating oil in a hole. Further, the spherical powder formed into a pipe shape is also used as a material for various filters and sound deadening parts.

Foamed metal has an increased porosity as compared with sintered metal. For the metal foam, the electroplating method, the casting method, and the powder sintering method are known as the manufacturing methods, and in any case, a complicated manufacturing process is taken into the product. Its applications range from filtration of gases and liquids to liquid transfer and flow rate control.

As described above, although many uses are expected, sintered or foamed metal is inevitably manufactured and supplied as a small component due to its manufacturing process, and a large-area thin plate-shaped or It is difficult to manufacture a functional material in which the surfaces of various parts are covered with a porous layer.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a material having a porous layer having functions such as silencing and deodorizing.

[0006]

The gist of the present invention is as follows.

(1) Fe: 30-70%, Al: 4-1
A material characterized in that a porous layer is formed by selectively corroding a Cu mother phase while leaving an Fe phase region in an alloy material containing 1% and the balance Cu and unavoidable impurities.

(2) Fe: 30 to 70%, Al: 4-1
1%, Cr: 18% or less relative to Fe, balance C
A material characterized by forming a porous layer by selectively corroding a Cu mother phase while leaving an Fe phase region of an alloy material composed of u and unavoidable impurities. (3) Fe: 30 to 70%, Al: 4 to 11%, Cr:
An alloy material containing 18% or less with respect to Fe and Si: 0.5 to 1.0% with the balance Cu and unavoidable impurities was selectively corroded in the Cu mother phase leaving the Fe phase region. A material characterized in that a porous layer is formed.

The present invention will be described in detail below. As is clear from the equilibrium phase diagram, the Cu-Fe alloy is characterized in that the solid solution amount of both elements is small. When the temperature is lowered from the molten state, Fe begins to crystallize at the solidification start point, With the decrease, the crystallization of Fe increases, and at 1093 ° C., there is a process in which Cu that had been molten until then solidifies at once.

At this time, Fe crystallizes in a dendrite form.
Thus, the present invention provides for the C from the surface of the alloy thus solidified.
It was found that by selectively corroding and dissolving u, dendrite-like Fe remains and a porous layer having a large surface area is formed.

Next, the role of the alloy element of the present invention will be described.
Fe crystallizes in a dendrite form and utilizes its surface area. If it is less than 30%, it becomes difficult to crystallize in a dendrite form, and the arms are torn off and left in island form. In addition, crystallization becomes coarse, and it cannot be expected to increase the surface area. If it exceeds 70%, the dendrite arm becomes too thick and does not contribute to the surface area, and at the same time, the workability such as hot and cold decreases, making it impossible to manufacture a thin plate or the like.

Cu corresponds to the sea where Fe freely crystallizes and grows in the form of dendrites. Al is an important element for improving the poor workability of the Cu-Fe alloy. If it is less than 4%, the workability is deteriorated, and if it exceeds 11%, a β phase having poor workability with Cu is crystallized. There is a risk of getting out.

[0013] Cr is an element for preventing the Fe phase from easily rusting when the Cu-Fe alloy forms a local battery between the Cu phase and the Fe phase. Therefore C
It is sufficient if the ratio of r / Fe is 18% or less. Si is an element that promotes the dendrite growth of Fe, but 1%
If it is over, the effect will be saturated. Further, if it is less than 0.5%, there is no action of promoting dendrite growth.

[0014]

EXAMPLE An alloy having the components shown in Table 1 was melted in a 30 kg air melting furnace, hot rolled at 900 ° C., and cold rolled to a thickness of 2 mm.
The sheet was finished and annealed at 850 ° C. for 1 hour. This material was immersed in a 50% nitric acid aqueous solution for 1 hour for selective corrosion to form a porous layer, and then the porous layer thickness and area magnification were measured. For the rust test, after leaving the material after forming the porous layer in a salt water atmosphere for 5 hours, devise it so that the resin enters the inside of the porous layer in the vacuum chamber, and observe the cross section by polishing to observe the porous layer 10 mm long. The number of rusting inside was checked.

[0015]

[Table 1]

From Table 1, it becomes possible to form a porous layer having a high magnification on the surface of the thin plate material. Materials 1 and 2 had rusting without addition of Cr. The materials 5 and 6 have a large area magnification due to the addition of Si.

It is possible to form a porous layer on the surface of a component having a complicated shape in addition to the plate material. For example, when it is used as an engine of an automobile or a component around the engine, it is possible to enhance the sound deadening and damping effect. Also, by applying a deodorizing material such as activated carbon to the surface of the porous dendrite Fe, it can be used as a functional member for environmental purification.

[0018]

EFFECT OF THE INVENTION The alloy material of the present invention has a sound deadening and vibration damping effect, and can be used as an automobile engine and parts around the engine. It can also be widely used as a carrier for deodorizing and gas reaction catalysts.

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Claims (3)

[Claims] 1. A weight ratio of Fe: 30 to 70%, Al: 4 to 11%, the balance Cu and inevitable impurities,
A material characterized in that a Cu mother phase is selectively corroded leaving an e-phase region to form a porous layer. 2. The material according to claim 1, which contains 18% or less of Cr: Fe. 3. The material according to claim 2, which contains Si: 0.5 to 1.0%.