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Патент USA US2137283

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2,137,283
Patented Nova-22, 1938
UNITED STATES PATENT OFFICE
corrna more
Franz R. Hensel and Earl I. Larsen, Indianapolis,
Ind., 'assignors to P.~R.. Mallory & Co., Inc.,
" Indianapolis, Ind., a corporation of Delaware
No‘Drawing. Application August 12, 1938,
Serial No. 224,499
1 Claim. (Cl. 75——159)
and then introduce a'predetermined amount of
This invention relates to copper alloys.
this
alloy into a coppermelt, containing the other
This case is a continuation in part of our co
in the desired proportions.
pending application S. N. 164,032, filed September I ingredients
After the alloy has been prepared according
15, 1937.
.
An object of the invention is to improve the to- such methods, the material may be heat 5
treated by ?rst‘quenching the'alloy in the form
physical, chemical and electrical characteristics of
a billet or sand casting, or any other form,
of such alloys.
'
'
Other objects of the invention will be apparent , from above 700° C. and subsequently aging at ‘a
temperature below 700° C. In certain cases, we
have found it also advisable to use one heat 10
from the following description, taken in connec
tion with the appended claim.
I
treatment only, namely, the low temperature
treatment, and eliminate the quenching treat
The present invention comprises a combination
of elements, methods of manufacture, and the
product thereof, brought out and exempli?ed in
the disclosure hereinafter set“ forth, the scope of
lit the invention being indicated in the appended
ment.
4
'
I
‘If the materials are processed by rolling, ex
truding, drawing, forging or any other fabricat- l5
ing methods, we have found it desirable in many
While a preferred embodiment of- the invention cases to quench the materials from the interme
is described herein, it is contemplated that con-. diate anneals, cold working same and applying
an aging treatment afterwards. This cold work
siderable variation may be made in the method ing
before aging hastens considerably the pre- 20'
claim.
‘
.
'
'
20 of procedure and the combination of elements, '
vgithout departing from the spirit of the inven
t on.
.
The present invention relates to the improve
ment of alloys of copper and zirconium. As
2% cording to the present invention the improved
after aging in order to improve the surface ?nish
' of the wrought material.
alloys are made of the following elements in
substantially the following proportions;
_
I
-
Per cent
Metal selected from the group consist‘
ing of iron, cobalt and nickel ______ .... 0. 1 to 30
3
cipitation of thedispersed phase. In addition,
a certain amount of cold work may be applied
,
An example of an alloy produced according to 25
the present invention is: .
Per cent
Zirconium __________________________ __
0.. 6'!
Cobalt-
2.04:
Silicon
___
0.83 at:
Copper _________ _.-. __________________ _- balance
Zirconium _________________________ _.. 0. 05 to 5
Beryllium __________________ _._- _____ __ 0. 05 to 3
Copper
___
balance -
Where high electricalconductivities are de
sired, it is preferred to keep the proportion of iron 7
group metal within an upper limit of 5%.
, The alloys of the present invention may ‘also
contain small‘proportions, or even up. to “several
40 percent, of zinc, tin, calcium, lithium, magnesium,
phosphorus and silver.
I
f‘,
The beryllium combines with theiroh group
metal or metals to form the beryllide"th'er'eof and
thereby imparts age-hardening characteristics to
45
the alloy.
.obtained,,with an excess of 45% electrical con- 35
ductivity. Cold working before or after aging
had little effect on the hardness.
‘ The addition of zirconium has further bene
?cial effects, in so far as it raises the annealing
temperature,v and at the same time provides a 4%
very fine grain'structure, which is highly desir
able ifthe material is to be worked into sheets,‘
' strips, or tubing.
The composition which has exceptional merits
for ‘condenser tubing is as follows‘:
‘ ' _
The addition of zirconium in this type of alloy
.
.
- its
Per cent '
not only imparts additional age-hardening char
Nickel ‘
acteristics, but also’produces a material of cor
rosion resistance, hgh strength at elevated'tem
Beryllium ____________________ _..'.._.‘.'__ 0. 05 to 3
50 peratures and superior fatigue and impact prop
erties.
‘
»
'
I
i-
~
The-alloys can be made according to standard
alloying methods. A preferred method’ for intro
ducing the zirconium is to prepare a hardener al
55
After quenching this alloy from 950° C. and ag
ing at 450° 0., a Rockwell B hardness of 105 was
loy containing a high percentage oi.’ zirconium
Zirconium
Copper ____ r. ____________ __' ________ __
15 to 30
0. 05 to 5
balance 50
' 'While'the present invention as to its objects
and advantages has been described herein as
carried out, in speci?c embodiments, it is not
desired to be limited thereby, but it is intended to 55
,
2
~
2,137,983
cover the invention broadly within the appended
clalm.
What is claimed is:
‘
,_
A heat-treated alloy composed of 0.05 to 5%
o zirconium, 0.1 to 30% of a metal or a combinatlon of metals selected from the group consist-
in: of iron, cobalt and nickel, 0.05 to 3% beryl-
lium, and the balance substantially all copper,
characterized by high hardness and further char
acterized by the fact that its hardness is not per
manently adversely affected by temperatures in
the order of 450° C.
‘
'
FRANZ R. HENSEL.
'
EARL I. LARSEN.
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