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Патент USA US2406275

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Patented Aug. 20, 1946
I 2,406,275
UNITED STATES PATENT OFFICE
2,406,275
ELECTRICAL RESISTANCE ELEMENT
Axel Richard Wejnarth, Stockholm, Sweden
No Drawing. Application June 5, 1945, Serial No.
597,711. In Sweden April 7, 1942
4 Claims. (C1. 201-7 6)
2
In my pending patent application No. 512,
high temperature and proof against chemical
054 protection is claimed for electrical resist
ance elements durable at high temperature and
proof against chemical action, consisting of a
as main component silicon carbide and more
over,‘ in smaller quantity, at least one com
sintered mass, containing as main component
pound belonging to the group of aluminium car
silicon carbide and moreoven'in smaller quan—
tity, at least one compound, belonging to. the
group of chromium carbide, chromium nitride,
bide, aluminium nitride, aluminium silicide and
chromium silicide and chromium boride, and
high temperature and proof against chemical
action, consisting of a sintered mass, containing
aluminium boride.
2. Electrical resistance element durable at
as further component one or more carbides, 10 action, consisting of a sintered mass, contain
ing as main component silicon carbide and
nitrides, silicides or borides of one or some of
moreover, in smaller quantity, at least one com
the metals Be, Mo, W, Ti and V. The sintered
mass according to the application may ‘also con
pound belonging to the group of zirconium car
bide, zirconium nitride, zirconium silicide, and
of one or some of the metals Mn, Fe, Ni and Co. 15 zirconium boride.
tain one or more nitrides, silicides or borides
It has now ‘been found that electrical ele
ments can be manufactured having the char
3. Electrical resistance element durable at
high temperature and proof against chemical
acteristic properties of the invention‘ applied
action, consisting of a sintered mass, contain
for, by manufacturing beyond the scope of the
ing as main component silicon carbide and
earlier patent application the elements from 20 moreover, in smaller quantity, at least one com
pound belonging to the group of chromium car
a sintered mass containing as main component
silicon carbide and moreover, in smaller quan
bide, chromium nitride, chromium silicide and
chromium boride, and at least one compound,
tity, a carbide, a nitride, silicide or boride of
A1 or Zr or several di?ferent such compounds.
belonging to the group of aluminium carbide,
In the present case, as according to the earlier
nitride, aluminium silicide and
patent application, the mass preferably con
aluminium boride.
4. Electrical resistance element durable at
tains a carbide, nitride, silicide or boride of
high temperature and proof against chemical
chromium, and the mass can also contain any
other compound mentioned in the application
' action, consisting of a sintered mass, contain-v
or a combination of several such compounds.
30 ing as main component silicon carbide and
The statements in the earlier application re
garding the process of manufacturing the elec
trodes intended in said application also apply
7
moreover, in smaller quantity, at least one com
pound belonging to the group of chromium car
bide, chromium nitride, chromium silicide and
to the manufacture of such electrodes of par
chromium boride, and at least one compound,
tially other composition as intended in the 35 belonging to the group of zirconium carbide,
present application.
zirconium nitride, zirconium silicide and zir
Having now described my invention, what I
conium boride.
claim as new and desire to secure by Letters
AXEL RICHARD WEJNARTH.
Patent is:
1. Electrical resistance element durable at 40
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