DE1947537A1 - Process for the production of copper materials hardened by internal oxidation - Google Patents

Description

GERMAN GOLD AND SILBIC SClIEIDEAiTa ¹ MLT VORlIALS ROIWSLER

Frankfurt / Main, Weißfrauenstrasse 9 1947537

Process for the production of hardened by internal oxidation Copper materials

The. The invention relates to a method for the production of copper materials hardened by internal oxidation in which metal oxides are embedded in a very fine distribution in a matrix of metallic copper.

It is known to produce such materials by powder metallurgical processes by adding powders of copper and metal oxides are mixed, this material is compacted and then sintered. The sintered material is then made into the desired Brought shape. This method does not allow materials with high strength and high conductivity to be achieved produce.

Furthermore, a method has been proposed (US Pat. No. 3,296,695) in which an alloy of copper and a Metal is subjected to an oxidation treatment. The oxygen penetrates into the alloy and oxidizes it with the Copper alloy metal. This material, which is in the form of a tape, for example, can be pressed into the desired End product to be transferred.

It is an object of the present invention to improve this process by making that available in small thickness dimensions internally oxidized material is subjected to a reduction process in an atmosphere containing hydrogen Eliminating excess oxygen in the copper matrix, the reduction process embrittles the copper severely. That brittle The product is then broken into small particles, which are filled into a casing or twisted into pressed bodies. "

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BATH ORIGINAL

The crushed material is then extruded into a Converted material that is deformable and z..B. is forgeable. As alloy metals here beryllium, aluminum, Ii.ignesium, Zirconium or silicon are often used.

Processing can be carried out by heating a thin ribbon of the copper alloy in the presence of an amount of oxygen sufficient to oxidize all of the easily oxidizable metal and to saturate the copper matrix with oxygen. The resulting oxidized metal is then heated at an elevated temperature in a hydrogen-containing atmosphere until the oxygen dissolved in the copper is completely reduced and the copper matrix becomes brittle. The resulting product, reduced by hydrogen, is then comminuted, e.g. in the form of small particles, and curtain then through a Pres "at elevated temperature in the desired shape to be processed copper alloy is preferably used in the form of a thin strip or, for example in chip form, so that the Q:. y for disinfection and Reduktionsprozes3 in a relatively short time are feasible It. It is advisable to ensure that no oxidation of the copper itself occurs and therefore the amount of oxygen used for the oxidation is limited of the oxidation process in contact with the alloy to be oxidized t, If the copper oxide is heated, it decomposes, with the oxygen content diffusing into the copper. The amount of copper oxide is measured in such a way that on the one hand the easily oxidizable metals become oxidized and on the other hand the copper matrix is saturated with dissolved oxygen. The copper oxide can be fed in separately from the alloy, but it can also be used by surface oxidation of the alloy in air, in which a layer of copper oxide is produced to the extent that it is perforated. The surface is oxylated. Uetall is then heated in an inert atmosphere _for 4 wherein it enters Sa.uere.toff 31JS the surface layer (Jen SU8 the alloy existing Jnnenlfern,

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The 0> ylation can also be carried out so that a measured ;.! »R.5; e brought into a closed chamber by Jauersxoff and in this the oxidation process is carried out.

The oxidation process is preferably carried out in a temperature range carried out between B) O and 1000 C. If g < Ren the oxidation time is much higher.

between B) O and 1000 C. At lower temperatures

Higher temperatures can also be used, however In this case, the temperature must be controlled in order to avoid local lightening, which would lead to the metal melting being able to lead.

The reduction of the metal to hydrogen after the oxidation process can be carried out with the usual heat treatment furnaces. The hydrogen can be supplied in the form of pure hydrogen gas, but another hydrogen-containing reducing gas such as split ammonia or products from natural gases or natural gas can also be used. A high hydrogen content is desirable, however, so that the production process runs as quickly as possible. The Reduktionsrrozrso is -ebenso as the Oxydati 0r.3pr0r.ess- durcngpführt preferably at temperatures 800-1 CuO ⁰ C.

The reduction takes place significantly at temperatures below 800 C lanr--; -H ^ r, while at temperatures above 1 000 C -as well as at der Cxyiutior.- local heating and a melting of the Can be made of copper.

It is known per se that in the reduction of contained in copper. d.'i'.stoff an embrittlement of the metal occurs, whereby the embrittlement with the oxygen content before the reduction increases.

■ ο

Both; Ancestors of the present invention also developed this phenomenon, if it is desired that the copper is practically combined with the raw material ^? is saturated in order to achieve a maximum embrittlement effect.

A 0 0 9 8 17/1336

BATH ORIGINAL

The brittle metal is mechanically crawled into pieces in the form of granules zer ±. This breaking process can be carried out with a hammer mill, for example, or a rolled-up strip can be subjected to a rolling process.

The material produced in granulate form is then put together in blocks for the hot pressing process. For example it is possible to produce such a block by compacting and sintering the material at a temperature of about 800-1000 ⁰ G. Preferably, however, the material present in granulate form is poured into a copper container and this is inserted into the extruder. The 3 "krangpressvorgHng takes place at the usual press temperatures for copper, which are, for example, between 900 and 1 200 ⁰ G. The hot pressing process converts the copper into a dense, homogeneous copper body of the desired shape, eg in tubes or rods has the effect of transforming the brittle metal into a workable, pliable state without changing its character as a two-phase product made of a copper matrix with dispersed metal oxide. The material produced can be subjected to any cold working process. A wide variety of oxidizable metals can be used as additives, in particular beryllium, aluminum, magnesium, zirconium and silicon. the Llenge of the filler metal is preferably in a range between 0.01 to 1 wt. ^c ß> of the alloy. Sine preferably alloy is a copper-beryllium alloy having a Berylldumgehalt 0.05 to $ 0.10 wt.

example 1

. An alloy of 0.1 ^c / o beryllium, remainder copper, is in the form of a rolled tape having an ^St: irke of 0.06 cn in a chamber is brought into contact with copper oxide, whose oxygen content is sufficient to oxidize at the 3erylliumgehalt and to saturate the copper matrix with oxygen. Heating takes place vährend 6 hours at a Tenoeratur of 850 ⁰ C. After cooling down

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This rolled-up tape is kept in an oven in a hydrogen atmosphere for 6 hours at a temperature of 850 ^° C. as well. After cooling, this results in a very brittle material that is converted into small particles in a hammer mill. The granulated material is then filled into a cylindrical container of copper, heated in this to a temperature of around 1 000 ° 0, then subjected to an extrusion process and pulled the rod-like material formed into a wire of 0.3 cm thickness. This material had the following properties ^{at temperatures of 20 °} C. and 800 ^{° C.:}

at 20 ^° C. at 850 ^° C.

Tensile strength 1 120 kg / cm ² 422 kg / cm ²

Flexural Strength 882 kg / cm ² 308 kg / cm ²

example ?:

A tape according to Example 1 was ^{heated in air at a temperature of 700 °} C. in order to produce a thin copper oxide layer on the surface. The surface-oxidized tape was heated in nitrogen at a temperature of 800 ° C. for 6 hours. As a result of this treatment, the oxygen migrated from the surface into the metal core, so that the beryllium was oxidized to beryllium oxide and the copper matrix was saturated with oxygen. Further treatment is carried out as in Example 1.

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BAP QRiOlNAL

Claims (7)

PAT7DIiTANuPRUCK 1. A process for the production of copper materials hardened by internal oxidation from copper alloys, those with easily oxidizable metals, characterized in that the material in small reductions in thickness is subjected to an oxidation process at elevated temperature, so that.3 the oxidizable metal in oxide converted and the Kupfernatrix is saturated with oxygen, subjecting the obtained product then at elevated temperature to a treatment in a wasserstoffhaltj gen atmosphere v / ill, until the dissolved in the Kupferraatrlx oxygen reduced, the product produced is reduced and then subjected to a pressing process at an elevated temperature will. 2. The method according to claim 1, characterized in that the copper alloy is used in strip form. 3. The method according to claim T, characterized in that the oxidation treatment is carried out by heating with copper oxide. 4. The method according to claim 1, characterized in that the copper alloy is subjected to an oxidation treatment in such a way that a copper oxide layer is formed on the surface and the product produced is then heated in an inert atmosphere until the Oxygen present on the surface has migrated into the copper matrix. 5 «Method according to claim ^ characterized ge ^ k ennzeichnet that the Ox ydat ions nimbly averaging is carried out in a 3auerstoffatmosphäre at a temperature between 800 and 1000 ⁰ G * 6. The method according to claim 1, characterized gekennze ic ^ HNET dais the "in hydrogen redttKierte and crushed by üetall, anti g sintering iii eiiien compacts converted / 7 BAD ORfGJNAl. will. · 19 * 7537 7. The method according to claim 1, characterized in that the material is poured into a copper container and then pressed. Frankfurt, '::: · in, September 10, 1969
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