DE907302C - Annealing of magnetizable iron-silicon alloys - Google Patents

Description

Annealing magnetizable iron-silicon alloys Iron-silicon alloys are used extensively as high-voltage sheets for Used dynamo machines and transformers. Here, there is a high maximum permeability and low watt losses, since the plates are in the area of strong magnetizable fields to be used. Thus, the heat treatment that develops these properties is also matched accordingly. In general, it consists of the up to the final thickness hot-rolled sheets at about 90o to 100o ° C in the absence of air in large stacks to be annealed.

The inventor set himself the task of creating magnetizable iron-silicon alloys to make it applicable also for those purposes in which there is a preferably high initial permeability and above all a low increase in permeability is important. In this Trap is the area of weakly magnetizing fields, as it is of particular importance in the case of telecommunications technology transmitters.

In the past, only iron-nickel alloys were used for this purpose, some of which have recently been replaced by nickel-free materials. While the iron-nickel alloys have the pair of values 1u20 = z000, 8 = zo%, the pair of values, u20 = 80o, 8 = about 50% was achieved with the nickel-free replacement materials. For the sake of completeness, it should be mentioned that "u20" means the permeability at a field strength of 20 mOe and " 8 " means the increase defined by (U100-A20) "100 / As0. It must be noted, however, that these values did not arise globally for nickel-free materials, but had to be sorted out from a larger batch and only make up a few percent in terms of quantity. In contrast, according to the invention it has now been possible to achieve a value pair of, ti.-o = 1.a.00, b = 25 1 / o, that is to say to obtain a lysis of the nickel-free materials which are already close to them in terms of their properties which brings nickel-containing materials.

The invention consists in the application of the method according to which magnebisierhare Iron-silicon alloys are annealed at temperatures of 80o Iris goov C for the purpose of a low increase, the permeability at comparatively high absolute values of the initial permeability. In particular, the Invention intended for those, as described at the beginning, manufactured in large quantities Dynamo and transformer sheets with the omission of their usual final glow now also to be used for low-voltage purposes, specifically other transmitters.

Regarding the ones to be used before performing the Glühurig In the atmosphere, it is essential that there is not excessive oxidation can take place. Accordingly, the Glühurig under the exclusion of air or under Hydrogen. The same effect can also be achieved with a vacuum will. however, this is technically more difficult to do on a large scale. The invention for the first time gives the possibility - entire batches of reproducible and consistently of the same quality in a simple manner, so that every sorting out unnecessary -is. At the same time «earth: but also the magnetic values, initial permeability and rise. the permeability, improved quite considerably.

Claims (3)

PATENT CLAIMS: e.g. The application of a glow furnace at temperatures from 80o to god ° C on magnetizable iron-silicon alloys to achieve a low increase in permeability with comparatively high absolute values, the Initial permeability. 2. Implementation of the Glühurig according to claim 1, characterized id. that the annealing atmosphere does not depend on the pretreatment (of the material or only weakly oxidizing is chosen. 3. The use of the according to claim 1 or 2 manufactured magnetizable materials for transmitters in telecommunications technology.