DE1153178B - Use of a deformable silver-metal oxide material for electrical contacts - Google Patents

Description

GERMAN

PATENT OFFICE

kl. 40 b-4 -

INTESNAT. KL. C 22 C

D 36488 VIa / 40b

REGISTRATION DATE: AUGUST 1, 1959

NOTICE LOGIN AND ISSUE OF THE EDITORIAL: AUGUST 22, 196J

The invention relates to the use of a deformable silver-metal oxide material for electrical Contacts.

Silver-metal oxide materials, especially Ag-CdO, are suitable because of their low tendency to weld particularly good as contact materials. However, the enclosed metal oxide particles make it difficult a deformation, as it is necessary for the production of semi-finished products and also finished contacts. For this reason, the contacts have hitherto been formed individually from the not yet oxidized silver-metal alloy and then carried out the internal oxidation for conversion into silver metal oxide. This claims a lot of time because of the long oxidation time. For the same reason you could also use semi-finished products Do not put in stock from ready-oxidized metal oxide, in order to later use the desired contact parts to make.

Deformability of the contact material is also essential if the connection ao tion of the contact material with a carrier material is to be carried out by cold pressure welding, so that this type of connection of silver-metal oxide contact materials with their carriers has not yet been carried out was possible.

Also the recently possible hot welding of such contact materials, which does not belong to the state of the art (Patent application D 31214 Ib / 49h and corresponding Auslegeschrift 1122812) required Sufficient ductility of the silver-metal oxide material in the further processing of the welded blank. It has now been found, surprisingly, that silver-metal oxide materials in which how to lower the electrical resistance and / or to reduce the phenomena of material migration known, traces of other metals are alloyed, the silver-metal oxide material is deformable do. According to the invention, additives of 0.001 to 1% have proven advantageous for this purpose Nickel, iron, molybdenum, cobalt, chromium, titanium and / or vanadium to that of silver and metal oxide existing remainder proved. These very small additions apparently have a grain-refining effect and as Crystallization nuclei for the precipitation of the metal oxide during oxidation.

The usual metal oxides, e.g. B. CdO, thereby no longer divide needle-like or in the grain use a deformable one

Silver - metal oxide material

for electrical contacts

Applicant:

Dr. Eugen Dürrwächter DODUCO ₅
Pforzheim, West 61

Dr. Eugen Dürrwächter, Pforzheim,
has been named as the inventor

limit, but extremely fine-grained and roughly spherical, so that the structure can be deformed without the risk of breakage will. The additives according to the invention also allow at considerably higher temperatures than otherwise to oxidize without coarse-grained precipitates being obtained as a result. Through the possible high oxidation temperatures and the fine-grained excretion also succeed in thicker ones Plates, rods or wires in economically viable times and with good quality results (fine-grained Precipitation even with great depth of oxidation, thus easily deformable) to oxidize through.

Claims (1)

PATENT CLAIM: Use of a silver alloy made by internal oxidation, consisting of that to be oxidized Constituent, 0.001 to 1% nickel, iron, molybdenum, cobalt, chromium, titanium and / or Vanadium, the remainder silver, produced silver-metal oxide contact material for production Deformable, thicker plates, rods or wires that are oxidized at considerably higher temperatures for further processing into contacts. Considered publications:
German Auslegeschrift No. 1 050 551;
U.S. Patent Nos. 2,673,167, 2,830,898.