US2410717A - Metallic compounds adapted to form an electrical contact - Google Patents
Metallic compounds adapted to form an electrical contact Download PDFInfo
- Publication number
- US2410717A US2410717A US461601A US46160142A US2410717A US 2410717 A US2410717 A US 2410717A US 461601 A US461601 A US 461601A US 46160142 A US46160142 A US 46160142A US 2410717 A US2410717 A US 2410717A
- Authority
- US
- United States
- Prior art keywords
- silver
- molybdenum
- contact
- powder
- electrical contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 150000001875 compounds Chemical class 0.000 title description 16
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 45
- 229910052709 silver Inorganic materials 0.000 description 44
- 239000004332 silver Substances 0.000 description 44
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 37
- 229910052750 molybdenum Inorganic materials 0.000 description 36
- 239000011733 molybdenum Substances 0.000 description 36
- 239000000843 powder Substances 0.000 description 22
- 239000000203 mixture Substances 0.000 description 20
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 11
- 229910052721 tungsten Inorganic materials 0.000 description 11
- 239000010937 tungsten Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 10
- 229910017052 cobalt Inorganic materials 0.000 description 8
- 239000010941 cobalt Substances 0.000 description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 238000009826 distribution Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000004615 ingredient Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 2
- 229940010552 ammonium molybdate Drugs 0.000 description 2
- 235000018660 ammonium molybdate Nutrition 0.000 description 2
- 239000011609 ammonium molybdate Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241000501667 Etroplus Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001347 Stellite Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 1
- JPNWDVUTVSTKMV-UHFFFAOYSA-N cobalt tungsten Chemical compound [Co].[W] JPNWDVUTVSTKMV-UHFFFAOYSA-N 0.000 description 1
- -1 cobalt tungsten cyanide Chemical compound 0.000 description 1
- XTUHPOUJWWTMNC-UHFFFAOYSA-N cobalt(2+);dioxido(dioxo)chromium Chemical compound [Co+2].[O-][Cr]([O-])(=O)=O XTUHPOUJWWTMNC-UHFFFAOYSA-N 0.000 description 1
- COLZOALRRSURNK-UHFFFAOYSA-N cobalt;methane;tungsten Chemical compound C.[Co].[W] COLZOALRRSURNK-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 150000003378 silver Chemical class 0.000 description 1
- MHLYOTJKDAAHGI-UHFFFAOYSA-N silver molybdate Chemical compound [Ag+].[Ag+].[O-][Mo]([O-])(=O)=O MHLYOTJKDAAHGI-UHFFFAOYSA-N 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
Definitions
- This invention relates to improvements in metallic compounds.
- the invention also relates to bodiesconsisting of said metallic compounds.
- the compounds herein contemplated are adaptable for various uses, they are particularly advantageous for use in the formation of electrical switch contacts and the like.
- my invention is useful inthe formationof many different metallic compositions,-it isparticularly useful and advantageous in the formation of metallic compounds, havingalloy characteristics, by the-use of metals or elements which will not allo in the ordinary manner.
- I refer to a compoundof silver and molybdenum, from which ingredients' an alloy, in the ordinary sense, cannot be produced.
- non-alloy-ableingredients m y be compounded in'a manner to obtain substantially all of the desirable characteristics of an alloy; such as homogeneity of the mixture of the ingredients, proper proportionality thereof, required hardness and electrical characteristics; etc.
- the aforementioned desirable results are attained by treatment of the ingredients of the compound in a relatively simple and inexpensive manner.
- Cobalt,tungsten and carbon (cobalt tungsten carbide from cobalt tungsten cyanide),
- Cobalt, tungsten and chromium stellite, from cobalt chromate and cobalt tungsten. chromate
- molybdenum and tungsten by the use of hydrogen, hydrocarbon, or carbonaceous gases; andthe invention also contemplates the controlled reduction by such agents of mixture of the aforementioned poly metallic salts.
- An object of the invention is to provide. metal-- 110 compounds having most. of the desirable characteristics of alloys.
- Another object is to provide for alloy char-- acteristics in metallic compounds the ingredients of which are unalloyable in the ordinary sense.
- Another and more specific object is to provide improved metallic compounds adaptable for use in the production of electrical switch contacts..-
- Another object is to provide electrical switch: contacts and the like of novel composition.
- One example of the method. herein contemplated is as follows: To a hot saturated solution of para ammonium molybdate is added. a hot. so lution of dilute silver nitrate, with resulting formation of a fine yellow precipitate. Such precipitate is freed of ammonium nitrate in a Wellknown manner, then dried, and then reduced in a. current or flow of dry hydrogen in steps say, for about fifteen minutes at 400 degrees EL, then. for about fifteen minutes at 800 degrees F., after which the temperature isgradually raised to about 1600 degrees F., at which temperature the reduction appears to be complete.
- the product of such reduction is an extremely fine grained silvery powder: of constant or homogeneous composition, in the sense that the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest. Powder produced in the manner just described showed a silver content of 49.2 per cent by weight.
- the compounds of silver and molybdenum, silver and tungsten, and silver and cobalt produced in accordance with my invention are especially adapted for the production of electrica1 contacts or contact tips, inasmuch as the inherently fine and substantially perfect (molecular) distribution of the refractory metal lattice, molybdenum, tungsten or cobalt) enables its most efficient use; so that for a given hardness and are resisting capactiy a greater percentage of silver can be used than has heretofore been possible, with a consequent decrease in the contact resistance. Also, the aforementioned precipitation hardening which pro Jerusalems a strain in the silver enhances the conductivity of the latter.
- any one of the powders (molybdides, tungstides or chromides) in the manner herein disclosed I may add thereto and intimately mix therewith a powder of the particular soft metal constituent thereof (such as silver, copper, nickel, cobalt, iron or manganese) to increase the percentage quantity of such softer metal in the final molded article. It is, of course, preferable to employ a powder obtained by the aforedescribed reducing operation which approXimates as closely as possible the desired percentages of the metallic ingredients in the final pressure molded and heat treated article.
- a powder adapted for molding under pressure into suitable form for use as an electrical contact saidpowder consisting of a homogeneous composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribw' tion of the molybdenum lattice is insured in the molded contact, said powder having a composition which is the equivalent of silver molybdide of the formula AgsMO'I.
- a powder form for use as an electrical contact said powder consisting of a homogeneous composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice is insured in the molded contact, said powder having a composition which is the equivalent of silver molybdide of the formula AgsMow, said powder having a silver content of 49.2 per cent by weight.
- a pressure molded electrical contact consistin of a homogeneous powder composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, said powder composition being the equivalent of silver molybdide of the formula AgsMow.
- a pressure molded electrical contact consisting of a homogeneous powder composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, said powder composition being the equivalent of silver molybdide of the formula AgeMo'z, and the silver content of said contact being 49.2 per cent by weight.
- a pressure molded electrical contact consisting of a. homogeneous powder composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, said powder composition being the equivalent of silver molybdide of the formula AgsMov, the silver content of said contact being 49.2 per cent by weight, and said contact when annealed at a temperature of 1200 degrees F. having a hardness of about 75 Rockwell B.
- a pressure molded electrical contact consisting of a homogeneous powder composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, said powder composition being the equivalent of silver molybdide of the formula AgeMov, the silver content of said contact being 49.2 per cent by weight, said contact when annealed at a temperature of 1200 degrees F. having a hardness of about '75 Rockwell B., and said contact when aged for several hours at 600 degrees F. having a hardness of about 97 Rockwell B.
- a pressure molded electrical contact consisting of a homogeneous powder composition of silver and molybdenum wherein the finest particles thereof. contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, so that for a given hardness and are resisting capacity an extremely high percentage of silver may beutilized.
Description
Patented Nov. 5, 1 945 METALLIC COMPOUNDS ADAPTED TO FORM AN ELECTRICAL CONTACT Irvin W. Cox, West Allis, Wis, assignor to-Cutler- Hammer, Inc., Milwaukee, Wis, a corporation oFFicEi of Delaware.
No Drawing. Application October 10, 1942,. Serial No. 461,601
7: Claims. 1
This invention relates to improvements in metallic compounds. The invention also relates to bodiesconsisting of said metallic compounds. Although the compounds herein contemplated are adaptable for various uses, they are particularly advantageous for use in the formation of electrical switch contacts and the like.
Although, as will appear, my invention is useful inthe formationof many different metallic compositions,-it isparticularly useful and advantageous in the formation of metallic compounds, havingalloy characteristics, by the-use of metals or elements which will not allo in the ordinary manner. Forexam-ple, I refer to a compoundof silver and molybdenum, from which ingredients' an alloy, in the ordinary sense, cannot be produced. Inaccordance with my invention, however, such non-alloy-ableingredients m y be compounded in'a manner to obtain substantially all of the desirable characteristics of an alloy; such as homogeneity of the mixture of the ingredients, proper proportionality thereof, required hardness and electrical characteristics; etc. Moreover, in accordance with my invention the aforementioned desirable results are attained by treatment of the ingredients of the compound in a relatively simple and inexpensive manner.
I will herein describe the method of producing one of the desired compounds of silver and molybdenum; but it is tobe understood that the method or technique herein disclosed is likewise applicable tothe production of other similar compounds of silver and molybdenum, and to a series of compounds of silver and tungsten, silver and cobalt; as well as to a series of compounds of:
Nickel and tungsten,
Nickel and molybdenum,
Cobalt and tungsten,
Cobalt,tungsten and carbon (cobalt tungsten carbide from cobalt tungsten cyanide),
Cobalt, tungsten and chromium (stellite, from cobalt chromate and cobalt tungsten. chromate),
Cobalt and molybdenum,
Copper and tungsten,
Copper and molybdenum,
Iron and tungsten,
Iron and molybdenum,
Manganese andtungsten,
Manganese and molybdenum.
and, in general, to suchv and other compounds containing atoms of. two or more metals in each.
controlled reduction of well defined poly metallic salts, such as those of the acids of chromium,
molybdenum and tungsten by the use of hydrogen, hydrocarbon, or carbonaceous gases; andthe invention also contemplates the controlled reduction by such agents of mixture of the aforementioned poly metallic salts.
An object of the invention is to provide. metal-- 110 compounds having most. of the desirable characteristics of alloys.
Another object is to provide for alloy char-- acteristics in metallic compounds the ingredients of which are unalloyable in the ordinary sense. v
Another and more specific object is to provide improved metallic compounds adaptable for use in the production of electrical switch contacts..-
Another object is to provide electrical switch: contacts and the like of novel composition.
Other objects and advantages of the invention will hereinafter appear.
One example of the method. herein contemplated is as follows: To a hot saturated solution of para ammonium molybdate is added. a hot. so lution of dilute silver nitrate, with resulting formation of a fine yellow precipitate. Such precipitate is freed of ammonium nitrate in a Wellknown manner, then dried, and then reduced in a. current or flow of dry hydrogen in steps say, for about fifteen minutes at 400 degrees EL, then. for about fifteen minutes at 800 degrees F., after which the temperature isgradually raised to about 1600 degrees F., at which temperature the reduction appears to be complete. The product of such reduction is an extremely fine grained silvery powder: of constant or homogeneous composition, in the sense that the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest. Powder produced in the manner just described showed a silver content of 49.2 per cent by weight.
From the foregoing it. is obvious that the yel'-- low silver molybdate; (precipitate) was the para. salt corresponding to silver para ammonium molybdate, or AgsMoqO24(H2O) X, and that the reduced powder is the equivalent of silver molybdide, of the formula AgGMO'I.
When such reduced powder is molded or com-' pressed into suitable form for use as electrical contacts, a polished and etched specimen shows, under a microscope, an extremely fine structure; in which silver and molybdenum are not distinguishable asseparate components. After the molded contacts have been annealed: at a temperature of 1200 degrees F. they have a hardness ofabout Rockwell B., but by aging the same for several hours at 600 degrees F. the hardness thereof is increased to about 97 R. B. This hardening is, to a large. extent atleast, a strain hardening produced by the tendency toward precipitation of the silver from the silver molybdide of which the contact is composed.
The fact that the material produced in accordance with my invention is a new and different constitution of matter has been demonstrated by a comparison of a micro-photograph of such material with a similar micro-photograph of a sin tered contact material made in the usual way from substantially the same percentage content of the ingredients silver and molybdenum (namely, by mixing silver powder with molybdenum powder, and pressing and sintering the mixture).
The following is a partial list of the various silver salts of molybdenum and tungsten acids--the water of crystallization being omitted from the formulae--and the final column showing the respective molybdides and tungstides:
The compounds of silver and molybdenum, silver and tungsten, and silver and cobalt produced in accordance with my invention are especially adapted for the production of electrica1 contacts or contact tips, inasmuch as the inherently fine and substantially perfect (molecular) distribution of the refractory metal lattice, molybdenum, tungsten or cobalt) enables its most efficient use; so that for a given hardness and are resisting capactiy a greater percentage of silver can be used than has heretofore been possible, with a consequent decrease in the contact resistance. Also, the aforementioned precipitation hardening which pro duces a strain in the silver enhances the conductivity of the latter.
After producing any one of the powders (molybdides, tungstides or chromides) in the manner herein disclosed I may add thereto and intimately mix therewith a powder of the particular soft metal constituent thereof (such as silver, copper, nickel, cobalt, iron or manganese) to increase the percentage quantity of such softer metal in the final molded article. It is, of course, preferable to employ a powder obtained by the aforedescribed reducing operation which approXimates as closely as possible the desired percentages of the metallic ingredients in the final pressure molded and heat treated article.
I claim:
1. As an article of manufacture, a powder adapted for molding under pressure into suitable form for use as an electrical contact, saidpowder consisting of a homogeneous composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribw' tion of the molybdenum lattice is insured in the molded contact, said powder having a composition which is the equivalent of silver molybdide of the formula AgsMO'I.
2. As an article of manufacture, a powder form for use as an electrical contact, said powder consisting of a homogeneous composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice is insured in the molded contact, said powder having a composition which is the equivalent of silver molybdide of the formula AgsMow, said powder having a silver content of 49.2 per cent by weight.
3. As an article of manufacture, a pressure molded electrical contact consistin of a homogeneous powder composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, said powder composition being the equivalent of silver molybdide of the formula AgsMow.
4. As an article of manufacture, a pressure molded electrical contact consisting of a homogeneous powder composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, said powder composition being the equivalent of silver molybdide of the formula AgeMo'z, and the silver content of said contact being 49.2 per cent by weight.
5. As an article of manufacture, a pressure molded electrical contact consisting of a. homogeneous powder composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, said powder composition being the equivalent of silver molybdide of the formula AgsMov, the silver content of said contact being 49.2 per cent by weight, and said contact when annealed at a temperature of 1200 degrees F. having a hardness of about 75 Rockwell B.
6. As an article of manufacture, a pressure molded electrical contact consisting of a homogeneous powder composition of silver and molybdenum wherein the finest particles thereof contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, said powder composition being the equivalent of silver molybdide of the formula AgeMov, the silver content of said contact being 49.2 per cent by weight, said contact when annealed at a temperature of 1200 degrees F. having a hardness of about '75 Rockwell B., and said contact when aged for several hours at 600 degrees F. having a hardness of about 97 Rockwell B.
7. As an article of manufacture, a pressure molded electrical contact consisting of a homogeneous powder composition of silver and molybdenum wherein the finest particles thereof. contain the same proportions of silver and molybdenum as the coarsest, whereby an inherently fine and substantially perfect distribution of the molybdenum lattice in the contact is insured, so that for a given hardness and are resisting capacity an extremely high percentage of silver may beutilized.
'IRVIN w. ooxd
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US461601A US2410717A (en) | 1942-10-10 | 1942-10-10 | Metallic compounds adapted to form an electrical contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US461601A US2410717A (en) | 1942-10-10 | 1942-10-10 | Metallic compounds adapted to form an electrical contact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2410717A true US2410717A (en) | 1946-11-05 |
Family
ID=23833233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US461601A Expired - Lifetime US2410717A (en) | 1942-10-10 | 1942-10-10 | Metallic compounds adapted to form an electrical contact |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2410717A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2720458A (en) * | 1952-04-29 | 1955-10-11 | Sylvania Electric Prod | Nickel-tungsten-aluminum alloy for cathode structure |
| US2814571A (en) * | 1953-08-28 | 1957-11-26 | Sylvania Electric Prod | Process of coating ceramic with pyrophoric molybdenum |
| US3206385A (en) * | 1960-07-12 | 1965-09-14 | Gen Electric | Dispersion hardening |
| US3317286A (en) * | 1961-11-02 | 1967-05-02 | Gen Electric | Composite superconductor body |
| US3418103A (en) * | 1964-12-11 | 1968-12-24 | Mallory & Co Inc P R | Process for making tungsten and molybdenum alloys |
-
1942
- 1942-10-10 US US461601A patent/US2410717A/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2720458A (en) * | 1952-04-29 | 1955-10-11 | Sylvania Electric Prod | Nickel-tungsten-aluminum alloy for cathode structure |
| US2814571A (en) * | 1953-08-28 | 1957-11-26 | Sylvania Electric Prod | Process of coating ceramic with pyrophoric molybdenum |
| US3206385A (en) * | 1960-07-12 | 1965-09-14 | Gen Electric | Dispersion hardening |
| US3317286A (en) * | 1961-11-02 | 1967-05-02 | Gen Electric | Composite superconductor body |
| US3418103A (en) * | 1964-12-11 | 1968-12-24 | Mallory & Co Inc P R | Process for making tungsten and molybdenum alloys |
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