DE164639C - - Google Patents

Description

IMPERIAL A

PATENT OFFICE;

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M 164639 CLASS 47e.

H There are often self-lubricating bearing

• ».; · Metals become known, which by

f: ..-. Mixing metal powders with suitable ¹

<! powdery, solid or liquid lubricants

■ jj, 5 fabrics are made. From the solid body

'3 -.', '■■' pern whose properties they

.Jo called purpose to make the most suitable,

;!; should be mentioned: graphite, soapstone,

V smoky black, stearin, paraffin, naphthalene,

; ■. / ■ ίο camphor and all such hydrocarbons, which have very pronounced lubricating properties

' own stocks. Instead of this in powder

·]. · '■■ lubricants added in the form

i? : _Λ ■ .. you also have oils or rigid fats of all kinds

l · / 15 used.

'Cv "In order to ensure a complete and

I? speaking embedding of these various

j ■ -. Substances in the metal powder practically

| i ■ * possible, it is necessary to have the same in it

I ao to be distributed in such a way that with every.

I first particles of the metal in contact

II, come. For this purpose the : \ '; Metals in a porous or spongy '

J; shaped state are converted into

_; j. ^a 5 to which the pores of these substances

.: Include various lubricious substances

■ <: 'i can.

■! The invention consists in that one

} Metnil powder used, which is not by me- ·

ί; 3 <> cliahic crushing of solid metal,

* l but by certain, in the following more closely

", physical or chemical described

ν processes are produced, where metal *

; granules with a nut surface can be obtained

the. These. The method of manufacture allows the metal grains, owing to their unevenness, to lie firmly against one another when a pressure is exerted on them and to unite together with the lubricants to form a solid block. _v

This intimate union into a solid block would not be achieved if one would use powders produced by mechanical comminution; namely, this manufacture has the effect of flattening each of the metal particles so that the smoothed surfaces oppose an effective union by pressure. One was therefore forced to use the mixture of To add an adhesive to metal powder and lubricant to make a solid block: to deliver.

- A metal powder which corresponds to the purpose specified above is zinc powder, which is produced in a known manner by the precipitation of zinc vapors. ■

In order to produce powder from copper, which has the required properties, one crushes salts or the oxide of this metal to powder and mixes the powder with reducing bodies, for example _: carbon in powder form, such as graphite, coal, smoky black, and the like. The mixture is then brought to a sufficiently high temperature so that ^; the carbon frees the copper from its admixtures in a known manner.

An excess of carbon is added to the copper oxide or salts to make up the copper to be able to separate when the deoxidation has taken place. ■

Instead of adding an excess of graphite or the like to the copper oxide, can any powder that serves a similar purpose can be mixed in with it.

One can. Carbon through too

ίο replace organic substances which, with the Oxides of copper, mixed, are capable of releasing the carbon in the state of, for this

To deliver effect required fine distribution.

The metal powder can also be produced in a known manner by passing an 'electric current through a solution of the' metal salt in question.
■■■ 'Regarding the various metals and

ao "of the proportions in which they are mixed

/ · Den, it should be noted that this is entirely according to the purpose to be achieved and have it changed.

A mixture of copper with graphite and like is suitable for the production of parts, which should conduct the electrical current, for example dynamo brushes and'dergh die Adding a very small amount of a lubricant to the copper will extend the life Service life of the machine parts rubbing against each other.

Claims (1)

Patent-to sayings: I. Self-made by mixing metal powder and lubricant ^ lubricating metal, characterized in that by depositing Zinc powder obtained from zinc vapors or j by reducing copper oxide or ν porous, ; Copper mixed with a lubricant and pressed into solid forms - 'i ". is pressed together. : 2. Self-lubricating metal according to claim i, thereby. characterized in that the copper powder used by an excess of the _:. Reduction of copper oxides or salts required reducing agent is obtained.