JPS62158896A - Production of porous metallic body - Google Patents

Abstract

PURPOSE:To produce a porous metallic body having a three-dimensional network structure at a low cost by burning polyurethane foam plated with a metal and reducing the metal oxidized during the burning with a reducing gas generated by the burning. CONSTITUTION:Polyurethane foam provided with electric conductivity is electroplated with a metal and burned to obtain a porous metallic body having a three-dimensional network structure. The metallic body is oxidized during the burning, so it is necessary to reduce the oxidized metal to the metal. When the oxidized metal is reduced, a gas prepd. by adding 20% gaseous H2-N2 mixture having 20:80 ratio of H2;N2 to 80% reducing gas contg. CO2, N2 and H2 generated by the burning is used. Since the amounts of fresh gaseous H2 and N2 used are small, a porous metallic body having a three-dimensional network structure is produced at a low reduction cost.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement in a method for producing a three-dimensional mesh porous metal body.

<Conventional technology> Conventionally, when manufacturing a three-dimensional mesh porous metal body, polyurethane foam that has been given conductivity is first metallized by electroplating, and then the polyurethane foam is incinerated by roasting in the atmosphere. Then, the oxidized metal is reduced in horse gas or a mixed gas of 20% L and 80% N2 to form a complete metal porous body.

<Problems to be solved by the invention> As mentioned above, conventionally, IL, gas, or a mixed gas of N gas and N2 gas are used in the reduction process, but both gases are expensive and expensive. (This poses a problem in terms of production costs.)

Therefore, in view of the above-mentioned problems, the present invention provides a method for manufacturing a hollow metal porous body that reduces the amount of expensive N2 gas or a mixed gas of It gas and N gas used in the reduction process to save gas costs. The purpose is to provide

Means for Solving the Problems> The structure of the present invention to achieve the above object is to incinerate polyurethane foam coated with metal to obtain porous metal and to obtain polyurethane foam. The torrefied gas generated during foam incineration is 1-wrapped without being mixed with the atmosphere, and this torrefied gas is
Alternatively, this roasting gas may be combined with horse gas (N2 gas and N2 gas).
The method is characterized in that the porous metal is reduced in an atmosphere of a gas mixed with two gases.

In the above-mentioned roasting process, the polyurethane foam is completely combusted, so the roasting gas generated at this time is C
o2. It is a gas in a neutral atmosphere, consisting of N2 and a trace amount of CnHm and 02. Therefore, if this roasting gas is trapped so as not to mix with the atmosphere, it is possible to reduce the porous metal using this gas.

Further, at this time, for safety reasons, a small amount of Tsuru gas or a mixed gas of N2 gas and N2 gas may be mixed with the roasting gas to create a weak y-element atmosphere. The mixing ratio here varies depending on the desired reduction state, but for example, it is sufficient to use 80% of the roasted gas and 20% of the mixed gas of pigeon gas or (2:N, =20=80).

Effect> By using the gas generated from roasting, which was previously discarded, for the reduction of porous metals, the cost of reducing gas can be drastically reduced.

Examples Example 1 A polyurethane foam imparted with electrical conductivity is electroplated to metallize it, and is roasted to incinerate the polyurethane foam, and the gas generated at this time is wrapped.

The porous metal obtained by the above roasting is transferred into a reduction furnace,
The roasting generated gas trapped in this reduction furnace is
Introduce rn'/hr and add a separate specific gas of 5
It was introduced at rn'/hr and heat treated. As a result, the porous metal was completely reduced and a three-dimensional network-like porous metal body was obtained.

For comparison, a similar porous metal was heated with N2 gas at 5 m'/hr.
Reduction was carried out while introducing a mixed gas of 10N2 gas at a rate of 20 m/hr, and a three-dimensional network-like porous metal body similar to the above example was obtained.

Therefore, in this example, 20 rn'/hr of N2 gas was saved compared to the comparative example.

Example 2 When reducing the porous metal obtained in the same manner as in Example 1, only the roasting mixed gas was introduced at 25 rn'/hr, and the porous metal was completely reduced. A three-dimensional network-like porous metal material similar to that was obtained.

For comparison, when a similar porous metal was reduced by introducing H gas at 25 m/hr, a similar three-dimensional network porous metal body was obtained.

Therefore, in this example, compared to the comparative example, a saving of 25% gas rn'/hr was achieved.

<Effects of the Invention> As specifically explained above in conjunction with Examples, according to the method of the present invention, the gas cost in the reduction process in producing a porous metal body can be drastically reduced, thereby providing a low-cost porous metal body. can do.

Patent applicant Sumitomo Electric Industries, Ltd. People

Claims (1)

[Claims] By roasting metal-plated polyurethane foam, this polyurethane foam is incinerated to obtain porous metal, and the roasting gas generated when polyurethane foam is incinerated is trapped without mixing with the atmosphere, and this roasting gas is trapped. A method for producing a porous metal body, characterized in that the porous metal is reduced in an atmosphere of a gas or a gas in which H_2 gas or a mixed gas of H_2 gas and N_2 gas is mixed with the roasting generated gas.