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Патент USA US2129840

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Patented Sept. 13,1938
2,129,840
UNITED STATES PATENT oer-"ice
Werner Hessenbruch, Hanau-on-the-Main,
’
'
Germany
i
'
‘No Drawing. Application‘ September 5, 1936, se
rial No. 99,620.v In Germany September 24,
- vs Claims. (01. 148-1)
This invention relates to objects made of an solution, lime water, baryta water, and caustic
alloy containing iron and aluminum.
soda solution, removing the objects from the al
It is known to make electrical heating elements kaline solution and drying in the remaining alka
bl
of alloys which, in addition to iron, contain vari
ous amounts of aluminum, for example 242%
line constituents.
'
.
and may also contain chromium in amounts from
2.’ The method of increasing the resistance to 5
heat of objects made of an alloy consisting of
0.1 up to about 35%. These alloys are distin
guished by the feature that, in general, they are
iron and aluminum, which method comprises
subjecting the objects to the action of an alka-
very resistant to heat up to temperatures of
J about 1,300° C. ' It is also known that these ‘alloys
sometimes exhibit an abnormal phenomenon
which may be termed “blistering” (formation of
carbuncles). This phenomenon consists in the
formation at various places on the‘ heating ele
line solution of the group of- sodium carbonate
solution, lime water, baryta water, and -caustic 10 ,
soda solution, removing the objects from the
alkaline solution and drying in‘ the remaining
alkaline constituents.
3. The method of increasing the resistance of
5 ment for example of black spots, which then ’ heat of objects made of an‘ alloy consisting of 15
lead to accelerated oxidation and to breakage of - iron, aluminum and chromium, which method
the heating elements at these places. Reference comprises subjecting the objects to the action of
has been made to this phenomenon for example '
an alkaline solution of the group of sodium car- ,
in the periodical “Elektrowarme,” January 1935,
bonate solution, lime water, baryta water, ‘and
o in an article entitled “Ueber hochhitzebestandige
Chrom-Aluminium-Eisenlegierungen.”
According to the present invention, the forma
tion of these blisters or carbuncles- and there
' fore premature local destruction of the heatingv
5 elements is avoided by treating the material with
an alkaline solution before it is brought into
operation. For example, the heating elements
are placed in a sodium carbonate solution, in
lime water, baryta. water or caustic soda solu
) tion. The duration of the immersion in the alka
line solution may amount, for example, to a few
hours but may also be extended to~ several days.
If the material is then removed from the alka
line solution and the residues of the alkaline
; constituents are burnt in by heating to a tem-,
perature of several hundred degrees the afore-;
mentioned
moved. The
tendency
burning
to form
in‘ ofblisters
the alkali
is entirely
can re-'
be -'
caustic soda solution, removing the objects from 20
the alkalinesolution and drying in the remain
ing alkaline‘ constituents.
.
-
,
'
»
'
4. The method of increasing the resistance to
heat of objects made of an alloy containing iron
and aluminum, which method consists-in im- 25
mersing the objects for a period of from several
hoursto several days in an alkaline solution of
the group of sodium ‘carbonate solution, lime
’ water, baryta water, and caustic soda solution,
removing the objects from the alkaline solution 30
and drying in the remaining alkaline constit
uents.
"
'
(
~
,
‘
5. The method of. increasing the resistance to
heat of objects made of an alloy ‘containing iron.
and aluminum, which method consists in im- 35 '
_mersing"the objects for'a period of from several
lidurslto several-“days in an alkaline solution of
the ,é'roup of sodium carbonate solution, lime
eifected either in a separate operation or when’ water, baryta water, and caustic soda solution,,
p the material is heated for use for the ?rst time; u and removing a deposit formed ‘on the solution 40
When the alkaline solution employed for ‘the
treatment of the material is such that a ‘fskin”
consisting of alkaline constituents is formed on
the surface of the solution, as occurs for example
i in the case of lime water, it'eis then advisable to
remove‘ this skin from the solution before the
'material is removed from _the solution in order
iron, aluminum and chromium which method
-
consists in immersing the objects for a period of 45
from several hours to several daysin‘ an alkaline
I claim:-
solution of the group of sodium carbonate solu
tion, lime water, baryta water, and caustic soda
solution, removing the objects from the alkaline
solution and" drying in the remaining alkaline 50
1. The method of increasing the resistance to
constituents.
‘ that the skin may not adhere to the material
itself.
|
before removing the objects from the solution. ~‘
6. The method of increasing the resistance-to
heat of objects made of an alloy consisting ‘of
'
-
>
, heat of objects made of a ferritic alloy contain
ing iron and aluminum which method comprises
subjecting the objects to the action of an alka
line solution of the group of sodium carbonate
'
'1. The method of increasing the resistance to
heat of objects made of an alloy consisting of
iron, aluminum and chromium, which method
consists in subjecting the objects to the action 55
2
.
2,129,840
of an alkaline solution of the group of sodium
carbonate solution, lime water, baryta water, and
caustic soda solution, removing the objects from
the alkaline solution, and then subjecting the
objects to a temperature of several hundred de
grees centigrade.
8. The method of increasing the resistance to
heat oi’~ objects made of an ‘alloy consisting of
iron, aluminum and chromium, which method
consists in immersing the objects for a period of
from several hours to several days in an alkaline
solution of the group of sodium carbonate solu
tion, lime water, baryta water, and caustic soda >
solution, removing a deposit formed thereon, re
moving the objects from the solution, and drying
in the remaining alkaline constituents.
WERNER HESSENBRUCH.
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