JPS586903A - Manufacture of sponge-like copper material - Google Patents

Abstract

PURPOSE:To obtain sponge-like copper materials economically with simple process by burning away the plastics mixed with powder and granules of copper and sintering the powder and granules of copper. CONSTITUTION:Powder and granules of plastics as well as those of copper are mixed, and the mixture thereof which is held put in a vessel is heated in gaseous hydrogen flow and/or atmospheric air to burn away the plastics and to sinter the copper power and granules, thereby allowing the continuous body of copper to remain.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a spongy body made of copper or a copper alloy (hereinafter simply referred to as copper).

The following methods have been developed for producing cavernous safes.

(1) Adding a gas generating substance to the molten metal.

(2) Plating the surface of the foamed resin skeleton.

(6) The foamed resin is buried in a plaster slurry, the resin is decomposed and removed, and the molten metal is poured into a plaster mold made.

(4) In the process of forming the foamed resin skeleton, a metal powder slurry is coated and sintered.

These methods are used depending on the target safe.

In principle, the methods (1) to (4) above can be applied to copper, but the method of collapsing also requires complicated steps and cannot be said to be an economically advantageous method.

The present invention has been made for the purpose of providing an economical method for producing copper spongy bodies that cannot be obtained by the methods described above.

In order to achieve such an objective, this invention uses a mixture of plastic powder and copper powder,
A method is adopted in which the plastic is heated in a hydrogen stream and/or in the atmosphere while it is in a container, and the plastic is burned out and the copper powder is sintered to leave a continuous column of copper.

In this case, examples of the copper powder include commercially available electrolytic copper powder and pulverized oxide scale, which may be mixed in appropriate amounts, or may be mixed with other metal components such as Sn or Zn.
There is no problem even if it is mixed with powder or granular material.

Examples will be described below.

Example 1 Plastic granules of 100 μm size and copper oxide scale crushed to 100 mesh or less were mixed at a volume ratio of 8.
After preparing the ingredients so that the ratio is 0:20 and mixing them in a ball mill, a steel container (10011) x 10 thickness x 60
0 length), and the whole was compacted to reduce the number of voids.

After that, heating was performed at 800°C for 2 hours in an H2 atmosphere,
The copper oxide powder was reduced and the plastic granules were incinerated.

Although reduction and sintering of the copper powder progressed through this heat treatment, there were still some parts inside that had not been sufficiently reduced, so heating was performed again at 800°C for 2 hours, resulting in a 80% reduction in voids.
A spongy steel material was obtained.

Example 2 Plastic granules of 100 μm in size and commercially available electrolytic copper powder of 100 mesh or less were mixed in a volume ratio of 80:20, compacted and heated in the same manner as in Example 1. Upon treatment, a spongy steel material with a porosity of 80% was obtained.

As is clear from these examples, according to the present invention, since inexpensive materials are combined and the manufacturing process is simple, a spongy steel material can be obtained extremely economically. In addition, since the surface of the reduced copper oxide powder has a large surface area, this invention has the advantage of being able to microscopically increase the large surface area that is a feature of spongy metals, and its industrial value is extremely large. be.

Although in the previous example the heating was carried out in a reducing gas stream, the rod can also be combined with heating in the atmosphere.

Claims (1)

[Claims] 1. By heating a mixture of plastic powder and copper powder in a high-temperature atmosphere, the plastic is burned out and the steel powder is sintered. A method for producing a spongy steel material characterized by: 2. The method according to claim 1, wherein the copper powder is an oxide and the high temperature atmosphere is a reducing air flow. 3. The method according to claim 1 or 2, wherein the mixture of plastic powder and copper powder is compressed and then heated.