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Патент USA US2109387

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Patented Feb. 22, 1938
Daniel Hanson, Haselor, Alcester,_~ and William
Thomas Poll-Walpole, Tipton, England, as
signers to John Campbell,
vKensington, Eng
No Drawing.
No. 89,998.
Application July 10, 1936, Serial
Great Britain February 9,
2 @laims. (Cl. 143-13)
This invention relates to tin alloys and methods of producing the same.
can, however, be determined by miscroscopical
examination of the structure.
_ It isknown that the metal tin, although ductile,
The above treatment is preferably followed by
a further heat treatment consisting in heating
the alloy to a temperature not greater than 130°
C. as, for example, by immersion in boiling wa
ter, and it is found that this second heat treat—
ment although not essential confers greater sta- ’
1c are largely used in making pewter and-for the
tainers, the construction of chemically resistant
1.; plants and vessels, and the like.
I‘ however, have su?cred from the disadvantage,
bility on the heat-treated alloy.
The period of second heat treatment-‘varies 10'
history of the metal, for ex
ample the size of casting, temperature of cast
ing and whether the metal has been worked by
rolling, etc.
Cadmium tin alloys produced by this invention
show a considerable improvement in strength as
compared with the tin itself or with cadmium
20 was temporary in character and disappeared in
atmospheric temperatures.
a very long period of time at atmospheric tem
The object of the present invention is to pro
re (A
tin alloys that have not been heat-treated with
out losing their ductility and this improvement
in strength is retained either permanently or for
Moreover, the alloys also possess the property
of being strengthened by the. application, after
duce improved tin alloys having all the advan
tages of the known alloys but without the disad
heat treatment, .of azncderate
degree of cold '
working such as is involved in bending, pressing,
forming, spinning and similar manufacturing
processes, the improvement in strength thus ac
quired being wholly or partially retained either
exceeding 130“ C. but less than the temperature
at which the alloy begins to melt, and cooling
permanently or for very long periods of time.v I
The alloys so produced are capable of being
.used as an improved form of pewter and for
rapidly, as by quenching or cooling in air.
The invention also consists in a method ac
making into sheet, strip, foil or other worked
forms, or into articles made from such worked
cording to the two preceding paragraphs in which
the ?rst heat treatment is followed by a further
forms, and the percentage or cadmium employed,
heat treatment consisting in heating the alloy to
the temperature to which the alloy-is heated and
the period of time for which such heating is
maintained, as also the- rapidity of the cooling
operation may be ‘varied depending upon the
a temperature not greater than ‘130° C. as, for
example, by immersion in boiling water.
The invention also consists in tin alloys when
ever produced by the hereln described methods;
In carrying our invention into effect in- one
convenientmanner we produce our improved tin
H! D agBi 9..
purpose for which the alloy is to be used or any
practical requirements that may have to be ful 4.0
Having now described our invention, what we
claim as new on
Patent is:.-
desire to secure by Letters
1. A method of producing a tin-alloy, which
consists in adding to the‘ tin an amount of cod
present without serious detriment.
mium in excess of 1 per cent. and not exceeding
The alloy thus produced is subjected to a heat 15 per cent. and heating the alloy to a tempera
treatment which consists in heating the alloy to ' ture exceeding. 130° C. but less than the tem
a temperature exceeding 130° C. but less than perature at‘which the alloy begins to melt, and 50
the temperature at which the-alloy begins-1110 cooling rapidly. as by quenching‘ or cooling in
1 _2'. A method according to claim 1 in which the
. ?rst heat treatment is-i'ollowed by a further heat
to which it is heated for a period su?'lciently long _ treatmenticonsisting in heating ‘the alloy to a
to enable equilibrium to be attained at that tem~ temperature?not greater than 130° C. as, vfor
peraturc, a period .of half an hour to three hours _
being usually sufficient.
The necesmry time
example, by immersion in boiling water.
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