DE2163190A1 - Process for making metal strips from metal powder - Google Patents

Description

Dr.-lng. E. BERKENFELD · Dipl.-Ing. H. BERKENFELD, patent attorneys, Cologne Attachment file number

for entering the 3rd Ι> βΖΘΙΐΛ> βΓ 1971 VA // Name of d. Note: HOMOGENEOUS METALS, INC <

Process for making metal strips from metal powder

The invention relates to methods of making metal strips from metal powder and, more particularly, to a method of making superalloy strips from metal powder, although the method can apply to other alloys _{and the like}

Usually the metals known as superalloys, i.e. alloys of iron, nickel or cobalt, are their Maintaining useful mechanical properties at elevated temperatures, pouring them into bars, which are then made into sheets forged or rolled out, cut up and conditioned, then rolled out into strips or plates, conditioned again and finally rolled out and cut into strips. During the process there are several heat treatments required, as well as a final heat treatment, depending on the customer's requirements. ”All of these treatments cost Time and money. Much more important, however, is the fact that this large amount of hot working reduces the boron content of the superalloy seeks to exhaust itself by oxidation. Boron is essential for breaking load resistance at elevated temperatures.

Sheets and strips of nickel, aluminum and iron have been rolled out directly from metal powder by passing the powder through a Rolling mill was fed, the rollers of which were arranged in a horizontal plane. When strips are rolled out this way it is necessary that the initial strength of the strip is sufficient to allow later processing. This means that the powder has a special shape

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must have, which can contribute to a high initial strength. High purity superalloy powders are used in the generally produced by a dry process which gives a spherical powder which has poor compressibility when cold and therefore lacks the special shape necessary to achieve initial strength »

The object of the invention is to develop a method for manufacturing metal strips from metal powder, which enables the strip to be manufactured from powder regardless of its shape. Copper or a strip or foil made of iron, the foil being in intimate contact with a cooling element at the time the hot metal particles are sprayed onto the substrate Chamber flushed with an inert gas _o The sprayed film is preferably cold-rolled to a predetermined dilution and then sprayed again if a greater thickness is desired. The amount of spray metal applied and the extent of cold rolling will depend on the particular alloy and thickness desired. Any subsequent spraying or plating after rolling will relieve the tension on the strip. Since the entire heat treatment is carried out in an inert atmosphere, the oxidation is eliminated. The base can be removed from the finished strip, preferably by etching, using, for example, hydroxide for an aluminum foil and nitric acid for copper or iron »

The invention therefore relates to a method for producing metal strips from metal powder, in which the powder is molten Metal is sprayed onto a cooled, moving metal foil, whereupon the foil and the sprayed-on metal

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solidified by the action of pressure.

In the above general description, certain tasks are Features and advantages of the invention indicated. Further objects, features and advantages emerge from the following Description with reference to the drawing, ■ in which shows:

1 schematically shows a longitudinal section through an apparatus for carrying out the method according to the invention and

Figure 2 is a longitudinal section of a strip made according to the invention is made of metal powder.

In Fig. 1, a sheet or a film 10 is shown, which is from a roll 11 through a seal 12 in the interior of a chamber 13 is introduced, in which the same passes over a water-cooled roller 14. The foil 10 is made with molten superalloy 15 sprayed by a plasma spray gun 16, which is supplied with the powdery superalloy from a funnel 17 will. The molten superalloy 15 solidifies on the foil 10 to form a layer of the superalloy which is between Pressure rollers 18 are passed through to the newly formed superalloy strip 15 to be rolled cold «.

If a greater thickness of the strip 15 is desired than would be applied in one pass in front of the plasma spray gun 16 the coating process is simply repeated as often as necessary. By spraying the molten superalloy the previously formed layer on the strip 15 is relieved of tension without the risk of oxidation.

When the base 10 is to be removed, the assembled strip is passed through an appropriate etching solution.

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leads to peel the backing away from the superalloy strip 15 after cold rolling.

The invention is not limited to the illustrated and described exemplary embodiment, which has various modifications can experience without departing from the scope of the invention.

Claims;

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Claims (1)

Dr.-lng. E. BERKENFELD · Dipl.-Ing. H. BERKENFELD, patent attorneys, Cologne Attachment file number on the submission of December 3, 1971 VA // Named.Anm. HOMOGENEOUS METALS, INC PATENT CLAIMS 1. A method for producing metal strips from metal powder, characterized by the following steps: a) the transformation of a metal powder into a molten spray metal, b) the application of the molten spray metal to a moving metal foil in an essentially uniform layer, c) the cooling of the metal foil and that applied to it molten spray metal to solidify it, and d) the solidification of the film and the sprayed-on metal by the action of pressure on the same. 2o method according to claim 1, characterized in that the foil is cooled simultaneously with the application of the molten spray metal to the same. 3. The method according to claim 1, characterized in that the film is coated with the spray metal and in an inert Atmosphere is cooled. 4. The method according to claim 1, characterized in that the foil consists of a metal selected from the group which contains aluminum, nickel, copper and iron, 5 "The method according to claim 1, characterized in that the metal is solidified by rolling under pressure. 6. The method according to claim 1, characterized in that the metal powder passes through a plasma spray gun to form a molten spray metal, 7. The method according to claim 1, characterized in that the film is removed by etching after solidification of the metal will. 8. The method according to claim 1, characterized in that the film in an inert atmosphere via a water-cooled Roll goes away and that the molten metal is splashed onto the foil, while the same is on the water-cooled Roller