Manufacture of Coated Metallic Powders.
Year: 1894

page_text: Date of Application, 26th June, 1894
Complete Specification Left, 14th July. 1894-Accepted, 18th Aug., 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by JOSEPH SACHS, of 14, Dey Street, New York,
United States of America, Merchant.]
Manufacture of Coated Metallic Powders.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention to be as follows:-
The
This invention relates to the production by electrolysis of a powder, each particle
of which consists of a core of a metal or electrical conductor and a shell of another
metal, the powder thus produced being applicable to the purposes to which bronze
or other metallic powders are employed and being cheaper than these.
manufacture is effected by agitating in a solution of metallic salt between electrodes,
a metallic or non-metallic conductor in a finely divided state its particles being
forced upon the cathode and kept from contact with the anode, so that they become
covered by electrolysis with a shell consisting of the metallic base of the salt
solution. The amount and character of the deposited shell depends upon the
nature of the electrodes and of the bath employed, the strength of the current,
the rapidity of motion of the pulverized conductor and the time of its exposure.
As an example, a powder consisting of particles of zinc or of a conductor such
as graphite is kept in agitation by revolving brushes in a cyanide solution of
copper and zinc contained in a compartment above a brass cathode and under a
perforated platinum or carbon anode protected by a dialytic partition.
The product obtained, when removed from the bath and dried appears to be
pure brass, and is ready for use after a suitable polishing.
Other metallic or non-metallic bases for powders may be used instead of zinc or
graphite, for instance iron, copper or carbon, and other alloys or metals may be
deposited thereon for instance gold or silver. The invention is not limited to the
production of a powder consisting of particles in an impalpable form. It can be
applied also to the manufacture of "flitters or flakes and of "metallics" or
particles which are larger than those to which the term powder is commonly applied
and which usually have well defined edges and surfaces.
Dated this 26th day of June 1894.
"
ABEL & IMKAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Manufacture of Coated Metallic Powders.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
This invention relates to the production by electrolysis of a powder, each particle
of which consists of a core of a metal or electrical conductor and a shell of another
metal, the powder thus produced being applicable to the purposes to which bronze
or other metallic powders are employed and being cheaper than these.
The
manufacture is effected by agitating in a solution of metallic salt between electrodes,
a metallic or non-metallic conductor in a finely divided state its particles being
1 Price S71

page_text: forced upon the cathode and kept from contact with the anode, so that they become
covered by electrolysis with a shell consisting of the metallic base of the salt
solution. The amount and character of the deposited shell depends upon the
nature of the electrodes and of the bath employed, the strength of the current, the
rapidity of motion of the pulverized conductor and the time of its exposure.
As an example, a powder consisting of particles of zinc or of a conductor such
as graphite is kept in agitation by revolving brushes in a cyanide solution of copper
and zinc contained in a compartment above a brass cathode and under a perforated
platinum or carbon anode protected by a dialytic partition.
The product obtained, when removed from the bath and dried, appears to be pure
brass, and is ready for use after a suitable polishing.
Other metallic or non-metallic bases for powders may be used instead of zinc or
graphite, for instance iron, copper or carbon, and other alloys or metals may be
deposited thereon, for instance gold or silver. The invention is not limited to the
production of a powder consisting of particles in an impalpable form. It can be
applied also to the manufacture of "flitters" or flakes and of "metallics" or
particles which are larger than those to which the term "powder" is commonly.
applied, and which usually have well defined edges and surfaces.
Various forms and arrangements of apparatus may be employed for operating in
the manner described.
Fig. 1 of the accompanying drawings is a longitudinal section and Fig. 2 is a
transverse section on X X of one arrangement suitable for the purpose.
V is a vessel having an inlet and an outlet g with a narrow mouth M preferably
formed in a plug which can be removed in order to clean the passage. C is an
inclined metal plate constituting the cathode and connected by the wire w' to the
negative terminal of the source of electricity; the plate C is supported on a block b
which may be of wood. A is the anode, also a plate which may be of carbon or
platinum perforated with numerous holes and supported parallel or nearly so to the
plate C on a dialytic diaphragm D which may be of baked clay. The anode A is
connected by the wire w to the positive terminal of the source of electricity.
Between the plates C and D are mounted a number of revolving brushes I of such
diameter that they just touch the upper surface of C. The vessel is charged with
a cyanide solution B containing copper and zinc salts, and a like solution having
suspended in it the conducting powder G which is to be coated (such as zinc or
carbon powder) is supplied at f. The brushes I, revolving, cause the powder
to rub on the cathode but prevent their adhesion to it or to each other, and they
gradually become coated with brass as they descend towards the outlet M whence
they issue with a portion of the solution into the receptacle H, from which the
solution may be pumped back to the inlet f.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The herein described process of manufacturing coated metallic powders by
electrolytically depositing shells of metal on the particles of conducting powders.
2. For effecting the above process, apparatus consisting of an inclined cathode
plate, above it a perforated anode plate over a dialytic diaphragm and between
the cathode and the diaphragm a number of revolving brushes, arranged within a
vessel charged and supplied with suitable solution and conducting powder,
substantially as described."
3. A powder consisting of particles of conducting material coated with metal
electrolytically deposited on them.
Dated this 14th day of July 1894.
ABEL & IMRAY,
Agents for Applicant.