Manufacture of a Compound Metal of Brass and Silver.
Year: 1898

page_text: Date of Application, 12th Jan., 1898
Complete Specification Left, 25th Mar., 1898-Accepted, 18th June, 1898
PROVISIONAL SPECIFICATION.
Manufacture of a Compound Metal of Brass and Silver.
I, EDOUARD MARTIN, of 46, Rue Dunkerque, Paris, France, Operative, do
hereby declare the nature of this invention to be as follows:-
No practicable method has been devised, as yet, for making a compound metal
consisting of brass and silver plates or sheets perfectly united together and
capable of being worked in the manner essential for diverse industries, capable
for example, of being bent embossed, repoussed, stamped and soldered.
My invention relates to the manufacture of such a compound metal in which
the brass and silver are perfectly united together. For this purpose plates of
brass of any dimensions and of a suitable quality accordingly as they are to be
worked hot or cold, are first cleaned, all dirt being removed from those surfaces
which are to be subsequently treated, and these are then covered with a thin
coat of copper either by galvanic deposition or by the application of a copper
foil by hydraulic pressure.
When galvanic deposition is the process adopted, a thin coating of zinc, tin
or silver is deposited on the brass, either before or after the copper. The plate
is then heated to redness and placed between two highly polished steel plates
under an hydraulic press and thus submitted to a powerful pressure.
This operation is to incorporate the copper, zinc, tin, silver or the copper alone
with the brass in order that in the next operation there may be no oxidation
of the brass and that the incorporated metals may constitute, when fused, a
solder or brazing.
The plates may be used, however, after they have received the galvanically
deposited metal or metals without having been submitted to hydraulic pressure.
The application of the silver is effected by hydraulic pressure in the following
inanner: - Upon each of the perfectly clean brass plates which have undergone
the process of galvanic deposition hereinbefore described is placed a foil or
sheet of silver, either pure or sufficiently alloyed to increase its strength, thus
it may 1000, 950, or 900 fine.
These foils or sheets are made of a weight corresponding with the proportion
of silver which is to be put on the brass.
Over the silver foil is placed a sheet of iron coated on both sides with a
suitable substance to prevent the adhesion of the plates contiguous thereto. A
second plate of brass is now placed upon the iron plate and is covered with a
silver sheet or foil and so on, the layers being repeated to make a pack of from
two to ten brass plates.
This superposition of the plates is necessary to avoid the fusion of the silver
sheets or foils (which are often very thin) when the temperature is raised.
A suitable preparation will be applied to the silver foils in order to prevent
them from autogenously soldering.
After the plates have been heated they are powerfully compressed in an
hydraulic press and then allowed to cool.
When the sheets are to be made by rolling a suitable brass is used in order:
that it may be rolled hot; two plates only are taken in this case, with the

page_text: silver foils face to face between them, so that they may be protected against
the high temperature.
Without this precaution the operation would be impossible because it is
necessary to heat the brass to a high degree in order that it may be rolled.
As soon as the plates are at the desired temperature the pack of two plates is
passed between suitable rolls. The silver foils unite with the prepared surfaces
of brass and a perfectly united double metal consisting of brass and silver is
obtained.
The plates are finally piled and rolled hot or cold to form sheets of any
dimensions.
As an alternative method, the brass plate, have been perfectly cleaned on the
surface which is to receive the silver, is covered with copper, zinc, tin or silver
by the processes described and is then heated and placed against an ingot mould,
so that it becomes one side of the mould; the mould and plate are tightly
squeezed together and molten silver is cast in the mould. The silver united with
the brass and the plate is heated and rolled or submitted to hydraulic pressure.
By either method a perfectly united compound metal is obtained which may
have silver on each side.
Dated this 12th day of January 1898.
ABEL & IMRAY,
Agents for the Applicant.
I, EDOUARD MARTIN, of 46, Rue Dunkerque, Paris, France, Operative, 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:—
No practicable method has been devised as yet, for making a compound metal
consisting of brass and silver plates or sheets perfectly united together and
capable of being worked in the manner essential for diverse industries capable
for example of being bent embossed repoussed, stamped and soldered.
My invention relates to the manufacture of such a compound metal in which
the brass and silver are perfectly united together. For this purpose plates of
brass of any dimensions and of a suitable quality accordingly as they are to be
worked hot or cold, are first cleaned, all dirt being removed from those surfaces
which are to be subsequently treated, and these are then covered with a thin
coat of copper either by galvanic deposition or by the application of a copper
foil by hydraulic pressure.
When galvanic deposition is the process adopted a thin coating of zinc, tin
or silver is deposited on the brass either before or after the copper. The plate
is then heated to redness and placed between two highly polished steel plates
under an hydraulic press and thus submitted to a powerful pressure.
This operation is to incorporate the copper, zinc, tin, silver or the copper alone
with the brass in order that in the next operation there may be no oxidation
of the brass and that the incorporated metals may constitute when fused, a
solder or brazing.
The plates may be used, however after they have received the galvanically
deposited metal or metals without having been submitted to hydraulic pressure.
The application of the silver is effected by hydraulic pressure in the following
manner: Upon each of the perfectly clean brass plates which have undergone
the process of galvanic deposition hereinbefore described is placed a foil or

page_text: sheet of silver either pure or sufficiently alloyed to increase its strength thus
it may be 1000, 950, or 900 fine.
These foils or sheets are made of a weight corresponding with the proportion
of silver which is to be put on the brass.
Over the silver foil is placed a sheet of iron coated on both sides with a
suitable substance to prevent the adhesion of the plates contiguous thereto. A
second plate of brass is now placed upon the iron plate and is covered with a
silver sheet or foil and so on, the layers being repeated to make a pack of from
two to ten brass plates.
This superposition of the plates is necessary to avoid the fusion of the silver
sheets or foils (which are often very thin) when the temperature is raised.
A suitable preparation will be applied to the silver foils in order to prevent
them from autogenously soldering.
After the plates have been heated they are powerfully compressed in an
hydraulic press and then allowed to cool.
When the sheets are to be made by rolling a suitable brass is used in order
that it may be rolled hot; two plates only are taken in' this case with the
silver foils face to face between them, so that they may be protected against
the high temperature.
Without this precaution the operation would be impossible because it is
necessary to heat the brass to a high degree in order that it may be rolled.
As soon as the plates are at the desired temperature the pack of two plates is
passed between suitable rolls. The silver foils unite with the prepared surfaces
of brass and a perfectly united double metal consisting of brass and silver is
obtained.
The plates are finally piled and rolled hot or cold to form sheets of any
dimensions.
As an alternative method, the brass plate, having been perfectly cleaned on the
surface which is to receive the silver, is covered with copper, zinc, tin or silver
by the processes described and is then heated and placed against an ingot mould,
so that it becomes one side of the mould; the mould and plate are tightly
squeezed together and molten silver is cast in the mould. The silver unites with
the brass and the plate is heated and rolled or submitted to hydraulic pressure.
By either method a perfectly united compound metal is obtained which may
have silver on each side.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is:
(1) The manufacture of a compound metal of brass and silver by first coating
a plate of brass with a layer of another suitable metal or other suitable metals
then covering the same surface with silver leaf of suitable fineness and finally
heating the plate and compressing or rolling it substantially as and for the
purpose set forth.
(2) The manufacture of a compound metal of brass and silver by first coating
a plate of brass with a layer of another suitable metal or other suitable metals,
then casting a layer of silver of suitable fineness on to the same surface while the
temperature of the plate is maintained at from 200° to 300° C, and finally rolling
or compressing the plate substantially as and for the purpose set forth.
Dated this 25th day of March 1898.
ABEL & IMRAY,
Agents for the Applicant.