US2370242A - Refractory metal composition - Google Patents
Refractory metal composition Download PDFInfo
- Publication number
- US2370242A US2370242A US472482A US47248243A US2370242A US 2370242 A US2370242 A US 2370242A US 472482 A US472482 A US 472482A US 47248243 A US47248243 A US 47248243A US 2370242 A US2370242 A US 2370242A
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0466—Alloys based on noble metals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49204—Contact or terminal manufacturing
- Y10T29/49206—Contact or terminal manufacturing by powder metallurgy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12181—Composite powder [e.g., coated, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
- Y10T428/12826—Group VIB metal-base component
- Y10T428/12833—Alternative to or next to each other
Definitions
- This invention relates to metal compositions (b) Molybdenum particles coated with rhoand articles made therefrom. dium 60 An object is to improve metal powder'compo- Silver 40 sitions. r
- Another object of the invention is to improve 5 g gfg particles mated with 65 powder metal bodies such as electric contacts,
- the present invention contemplates a metal (e) Tungsten coated with rhodium 80 composition made from refractory metal powsilver 2o ders, particularly tungsten and molybdenum, which are individually coated with protective Molybdenum Particles coated with i layers of a palladium-platinum group metal such 15 and/Or panadhlm 50 as platinum, palladium or rhodium and are S11v9!
- Tungsten particles coated with platinum coating and the coating of protective metal such palladium as platinum, palladium or rhodium may vary ver '7 in thickness from a fraction of a micron to sev- (i) Tungsten particles coated with platinum eral thousandths of an inch.
- gg i gfi i with platinum and/or 3 invention may fall within the following range Silver 20 of proportions: so
- c t refracmr powders 5013399 the powders with a dispersible adhesive.
- Copper silver or g ld Balance dust ng the adhesive Coated particles the P d 1 n i t t l protective metal in powder form and subseg 0m g me mg n me a compo quently heating the coated powders to'disperse 5 con a ng Percent the adhesive and diffusing the protective metal onto the surfaces of the refractory powders.”
- It Coated refractory puwders 5 to is'also possible to use a metal paste as a'coating Copper, silver or gold Balance medium.
- the metal-compositions of thepresent invenmetal compositions may be made from the coated particles in Percent several ways.
- the coated refractory particles, I (a) Molybedenum particles coated with rhoor a mixture of them, may be pressed to form a dium 50 powder compact and the compact then sintered Silver 50 6 at a suitable temperature such as 1200 C. to form the mixture.
- a slnter-bonded metal body This body is then impregnated with silver, copper or gold or any alloy of two or more Of these, by placing the first group metal in contact with the sintered compact and heating the assembly in a reducing atmosphere to a, temperature above the melting point of the lower melting metal so that it will flow into the pores of the sintered body and fill them.
- the metal composition may also be produced by mixing the coated particles directly with powders of copper, silver or gold, or mixtures of these, pressing the mixed powders and then sintering the pressed mixture at a suitable temperature such as 950 C. to produce the finished composition. If desired, subsequent repressing or coining operations may be applied to further increase the density and improve the physical characteristics of, the composition.
- a third method of manufacture comprises a combination of the above two methods.
- a portion of the copper, silver or gold in the form of a powder is mixed with the coated refractory powders and the mixture pressed in a suitable die.
- the pressed body is then sintered at a temperature to cause binding, such as 1250 C.
- Additional amounts of copper, silver or gold are then placed in contact with the sintered body and the assembly heated to a temperature above the lower melting point metal to cause impregnation.
- the protective layers oi platinum, palladium or rhodium on the refractory metal particles difiuse into the refractory material to a greater or lesser extent, forming alloys or compositions at the surfaces of the particles. These surface layers are considerably more noble in character as far as oxidation is concerned than the refractory particles themselves.
- the degree of diffusion of the protective metal will depend upon the time and temperature of the sintering process. It is also contemplated that in some cases the coated powders .may be pre-sintered in the loose state to accomplish diffusion before the powders are used in manufacturing the metal composition.
- An advantage of the present composition and process resides in the afilnity between the first group metals such as copper, silver and gold and the protective metals such as palladium, platinum or rhodium. Since the first group metals have a tendency to alloy with the protective layers they are readily drawn into any pores or spaces in the metal compact resulting in a denser and more nearly perfect and homogeneous metal structure. The alloying also produces a strong bond between the various metal phases present.
- compositions may be made to the compositions.
- additions of small proportions of other ingredients may be made to the compositions.
- from a fraction of a per cent to of carbon or boron may be added to The carbon is preferably in the form oi graphite.
- Such elements as nickel, cobalt, iron, manganese or silicon may be added in proportions ranging from a fraction of 1% to 30%. These have the efiect of increasing the hardness, wear resistance and tensile strength of the compositions.
- One important use of the metal compositions of the present invention is in electric contacts.
- Electric contacts have heretofore been produced of compositions of refractory metals and compounds with silver and copper in various proportions.
- Such compositions have developed relatively high contact resistances between the contacting surfaces and have exhibited a substantial temperature rise when subjected to continuous operation.
- the use of a protective metal coating from the palladium-platinum group on the refractory particles reduces the contact resistance considerably and produces a contact much less subject to overheating.
- Refractory compositions of the present invention which are particularly suitable for cooperation with cadmium oxide contacts of the type described in l-lensel Patent 2,145,690 are coated molybdenum particles with silver, and coated tungsten with silver.
- a metal composition formed of particles of refractory metal selected from the group consisting of tungsten and molybdenum, and a coating thereon of metal selected from the group consisting of palladium, platinum and rhodium and metal selected from the first group of the Periodic Table consisting of copper, silver and gold interspersed with and bonded to said coated particles.
- a metal composition formed of particles of refractory metal selected from the group consisting of tungsten and molybdenum, and a coating thereon of metal selected from the group consisting of palladium, platinum and rhodium and metal selected from the first group of the Periodic Table consisting of copper, silver and gold interspersed with and bonded to.
- said coated particles said coated particles being formed of 99.99% to 10% of said refractory metal and .01% to of said coating metal, the coated particles forming 5 to 99% of said composition and said first group metal forming the balance.
- An electric contact formed of a metal com position composed of particles of refractory metal selected from the group consisting of tungsten and molybdenum, and a coating on said particles of metal selected from the group consisting of palladium, platinum and rhodium and metal selected from the first group of the Periodic Table consisting of copper, silver and gold interspersed with and bonded to said coated particles, said coated particles being formed of 99.99% to 10% of said refractory metal and .01 to 90% of said coating metal, the coated particles forming 5 to 99% of said composition and said first group metal forming the balance.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Contacts (AREA)
Description
Patented Feb. 27, 1945 2,370,242 Fl C E 2,370,242 REFRACTORY METAL COMPOSITION Franz R. Hensel and Ea R Mallory & dianapolis, Ind., a corporation of lnd., asslgnors to P.
rl I. Larsen, Indianapolis,
00., Inc., In- Delaware No Drawing. Application January 15, 1943,
Serial No. 472,482
V 4 Claims. (Cl. 75-22) This invention relates to metal compositions (b) Molybdenum particles coated with rhoand articles made therefrom. dium 60 An object is to improve metal powder'compo- Silver 40 sitions. r
Another object of the invention is to improve 5 g gfg particles mated with 65 powder metal bodies such as electric contacts,
Silver 35 welding electrodes, welding dies, current carrying hearings or bushings, valve seats and the like. ((1) u l sten pa s Coa ed w th rho- Other objects of the invention will be apparent d1l1m 50 from the description and claims. 10 S11v6! 50 The present invention contemplates a metal (e) Tungsten coated with rhodium 80 composition made from refractory metal powsilver 2o ders, particularly tungsten and molybdenum, which are individually coated with protective Molybdenum Particles coated with i layers of a palladium-platinum group metal such 15 and/Or panadhlm 50 as platinum, palladium or rhodium and are S11v9! bonded together in a metal composition with a (g) M l bd n articles coated with platimetal from the first group of the periodic table nu and or palladium 60 such as copper, silver or gold. silver 40 33 525,222 :32 53 3 525 232 (h) Tungsten particles coated with platinum coating and the coating of protective metal such palladium as platinum, palladium or rhodium may vary ver '7 in thickness from a fraction of a micron to sev- (i) Tungsten particles coated with platinum eral thousandths of an inch. Thus the relative and/or palladium 50 percentages of refractory metal or compound and Silver 50 protective metals in the coated powders used for producing the metal composition of the present (7) gg i gfi i with platinum and/or 3 invention may fall within the following range Silver 20 of proportions: so
p t; (0) Tungsten coated with platinum and/or I Refractory metal 99,99 t 10 palladium or rhodium 45 Palladium-platinum group metal 0,01 t 90 Gold 55 The coated powders are interspersed and w Tun sten co t d with pl inum bonded with the second group metal and th r palladmm or rhod1um 70 suiting compositions may fall within the follow- Copper 30 mg range: p t; (or) Tungsten coated with platinum and/or Coated tungsten or molybdenum powpalladium or rhodium 50 ders 51,0 99 4 Copper 50 Copper silver or Balance The protective coating of rhodium, platinum This range may be divid d t t genera] or palladium may be applied by any one of several classes of.materia1s, namely: methods such as electroplating, cathode sputtering; metal spraying, condensing evaporated g gf refractory compositlons contam' metal on the particle surfaces, chemical deposi- Percent tion. They may also be coated by first coating c t refracmr powders 5013399 the powders with a dispersible adhesive. then Copper silver or g ld Balance dust ng the adhesive Coated particles the P d 1 n i t t l protective metal in powder form and subseg 0m g me mg n me a compo quently heating the coated powders to'disperse 5 con a ng Percent the adhesive and diffusing the protective metal onto the surfaces of the refractory powders." It Coated refractory puwders 5 to is'also possible to use a metal paste as a'coating Copper, silver or gold Balance medium. a Following are several examples of suitable 55 The metal-compositions of thepresent invenmetal compositions: tion may be made from the coated particles in Percent several ways. The coated refractory particles, I (a) Molybedenum particles coated with rhoor a mixture of them, may be pressed to form a dium 50 powder compact and the compact then sintered Silver 50 6 at a suitable temperature such as 1200 C. to form the mixture.
a slnter-bonded metal body. This body is then impregnated with silver, copper or gold or any alloy of two or more Of these, by placing the first group metal in contact with the sintered compact and heating the assembly in a reducing atmosphere to a, temperature above the melting point of the lower melting metal so that it will flow into the pores of the sintered body and fill them.
The metal composition may also be produced by mixing the coated particles directly with powders of copper, silver or gold, or mixtures of these, pressing the mixed powders and then sintering the pressed mixture at a suitable temperature such as 950 C. to produce the finished composition. If desired, subsequent repressing or coining operations may be applied to further increase the density and improve the physical characteristics of, the composition.
A third method of manufacture comprises a combination of the above two methods. According to this method, a portion of the copper, silver or gold in the form of a powder is mixed with the coated refractory powders and the mixture pressed in a suitable die. The pressed body is then sintered at a temperature to cause binding, such as 1250 C. Additional amounts of copper, silver or gold are then placed in contact with the sintered body and the assembly heated to a temperature above the lower melting point metal to cause impregnation.
During the sintering operation, according to any of the above methods, the protective layers oi platinum, palladium or rhodium on the refractory metal particles difiuse into the refractory material to a greater or lesser extent, forming alloys or compositions at the surfaces of the particles. These surface layers are considerably more noble in character as far as oxidation is concerned than the refractory particles themselves. The degree of diffusion of the protective metal will depend upon the time and temperature of the sintering process. It is also contemplated that in some cases the coated powders .may be pre-sintered in the loose state to accomplish diffusion before the powders are used in manufacturing the metal composition.
An advantage of the present composition and process resides in the afilnity between the first group metals such as copper, silver and gold and the protective metals such as palladium, platinum or rhodium. Since the first group metals have a tendency to alloy with the protective layers they are readily drawn into any pores or spaces in the metal compact resulting in a denser and more nearly perfect and homogeneous metal structure. The alloying also produces a strong bond between the various metal phases present.
In some cases additions of small proportions of other ingredients may be made to the compositions. For instance, from a fraction of a per cent to of carbon or boron may be added to The carbon is preferably in the form oi graphite.
Such elements as nickel, cobalt, iron, manganese or silicon may be added in proportions ranging from a fraction of 1% to 30%. These have the efiect of increasing the hardness, wear resistance and tensile strength of the compositions.
One important use of the metal compositions of the present invention is in electric contacts. Electric contacts have heretofore been produced of compositions of refractory metals and compounds with silver and copper in various proportions. However, such compositions have developed relatively high contact resistances between the contacting surfaces and have exhibited a substantial temperature rise when subjected to continuous operation. The use of a protective metal coating from the palladium-platinum group on the refractory particles reduces the contact resistance considerably and produces a contact much less subject to overheating.
By using contacts formed of the compositions described on one or both sides of a contact pair, sticking and high contact resistance can be eliminated in most cases.
Refractory compositions of the present invention which are particularly suitable for cooperation with cadmium oxide contacts of the type described in l-lensel Patent 2,145,690 are coated molybdenum particles with silver, and coated tungsten with silver.
While specific embodiments of the invention have been described, it is intended to cover the invention broadly within the spirit and scope of the appended claims.
What is claimed is:
l. A metal composition formed of particles of refractory metal selected from the group consisting of tungsten and molybdenum, and a coating thereon of metal selected from the group consisting of palladium, platinum and rhodium and metal selected from the first group of the Periodic Table consisting of copper, silver and gold interspersed with and bonded to said coated particles.
2. A metal composition formed of particles of refractory metal selected from the group consisting of tungsten and molybdenum, and a coating thereon of metal selected from the group consisting of palladium, platinum and rhodium and metal selected from the first group of the Periodic Table consisting of copper, silver and gold interspersed with and bonded to. said coated particles, said coated particles being formed of 99.99% to 10% of said refractory metal and .01% to of said coating metal, the coated particles forming 5 to 99% of said composition and said first group metal forming the balance.
3. An electric contact formed of a metal composition composed of particles of refractory metal selected from the group consisting of tungsten and molybdenum, and a coating on said par ticles of metal selected from the group consisting of palladium, platinum and rhodium and metal selected from the first group of the Periodic Table consisting of copper, silver and gold interspersed with and bonded to said coated particles.
i. An electric contact formed of a metal com position composed of particles of refractory metal selected from the group consisting of tungsten and molybdenum, and a coating on said particles of metal selected from the group consisting of palladium, platinum and rhodium and metal selected from the first group of the Periodic Table consisting of copper, silver and gold interspersed with and bonded to said coated particles, said coated particles being formed of 99.99% to 10% of said refractory metal and .01 to 90% of said coating metal, the coated particles forming 5 to 99% of said composition and said first group metal forming the balance.
FRANZ R. HENSEL. EARL I. LARSEN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US472482A US2370242A (en) | 1943-01-15 | 1943-01-15 | Refractory metal composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US472482A US2370242A (en) | 1943-01-15 | 1943-01-15 | Refractory metal composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2370242A true US2370242A (en) | 1945-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US472482A Expired - Lifetime US2370242A (en) | 1943-01-15 | 1943-01-15 | Refractory metal composition |
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Cited By (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2464517A (en) * | 1943-05-13 | 1949-03-15 | Callite Tungsten Corp | Method of making porous metallic bodies |
| US2600995A (en) * | 1945-10-30 | 1952-06-17 | Sylvania Electric Prod | Tungsten alloy |
| US2671955A (en) * | 1950-12-14 | 1954-03-16 | Mallory & Co Inc P R | Composite metal-ceramic body and method of making the same |
| US2672426A (en) * | 1950-12-14 | 1954-03-16 | Mallory & Co Inc P R | Metal-ceramic bodies and method of making |
| US2719786A (en) * | 1949-10-29 | 1955-10-04 | Rca Corp | Method of making a tungsten-nickel alloy filament |
| US2719797A (en) * | 1950-05-23 | 1955-10-04 | Baker & Co Inc | Platinizing tantalum |
| US2737541A (en) * | 1951-02-17 | 1956-03-06 | Roger S Coolidge | Storage battery electrodes and method of making the same |
| US2740191A (en) * | 1951-10-08 | 1956-04-03 | Ekstrand & Tholand Inc | Manufacture of plated powdered metal articles |
| US2752665A (en) * | 1950-04-21 | 1956-07-03 | Baker & Co Inc | Grain stabilized metals and alloys |
| US2844868A (en) * | 1954-06-01 | 1958-07-29 | Sylvania Electric Prod | Method of joining refractory metals |
| US2851381A (en) * | 1955-04-05 | 1958-09-09 | Gibson Electric Company | Simultaneous infiltrating and obtaining a brazable surface |
| US2872308A (en) * | 1948-12-07 | 1959-02-03 | Alan U Seybolt | Metal compositions |
| US2986465A (en) * | 1958-11-12 | 1961-05-30 | Kurtz Jacob | Method of making compact high density radiation screening material containing tungsten |
| US3024127A (en) * | 1958-02-14 | 1962-03-06 | Globe Ind Inc | Powder metallurgy |
| US3068016A (en) * | 1958-03-31 | 1962-12-11 | Gen Motors Corp | High temperature seal |
| US3069288A (en) * | 1959-08-06 | 1962-12-18 | Gen Electric | Self-repairing coatings for metal |
| US3129068A (en) * | 1960-02-05 | 1964-04-14 | Owens Illinois Glass Co | Metal coated refractory and process of manufacturing same |
| US3140342A (en) * | 1963-07-05 | 1964-07-07 | Chomerics Inc | Electrical shielding and sealing gasket |
| US3254189A (en) * | 1961-05-15 | 1966-05-31 | Westinghouse Electric Corp | Electrical contact members having a plurality of refractory metal fibers embedded therein |
| US3407061A (en) * | 1967-05-04 | 1968-10-22 | Whittaker Corp | Metal coating process |
| US3455023A (en) * | 1967-07-31 | 1969-07-15 | Rowe Ind Inc | Silver-carbon brush block and method of making same |
| US3463636A (en) * | 1967-01-03 | 1969-08-26 | Trw Inc | Constant conductivity alloys |
| US3484925A (en) * | 1967-05-23 | 1969-12-23 | Kopco Ind | Fluid compression technique for molding edm electrodes and other tungsten-based components |
| US3503720A (en) * | 1966-06-24 | 1970-03-31 | Chase Brass & Copper Co | Rhenium-refractory metal alloys |
| US3713901A (en) * | 1970-04-20 | 1973-01-30 | Trw Inc | Oxidation resistant refractory alloys |
| US4018599A (en) * | 1975-09-05 | 1977-04-19 | Engelhard Minerals & Chemicals Corporation | Electrical contacts of dispersion strengthened gold |
| FR2456582A1 (en) * | 1979-05-17 | 1980-12-12 | Cheetham Jeffery | LOW SILVER METAL POWDER FOR DENTAL AMALGAMS |
| US4592790A (en) * | 1981-02-20 | 1986-06-03 | Globus Alfred R | Method of making particulate uranium for shaped charge liners |
| EP0288118A1 (en) * | 1987-04-21 | 1988-10-26 | Koninklijke Philips Electronics N.V. | Method of producing a storage cathode |
| US4885214A (en) * | 1988-03-10 | 1989-12-05 | Texas Instruments Incorporated | Composite material and methods for making |
| US4944985A (en) * | 1988-04-11 | 1990-07-31 | Leach & Garner | Method for electroless plating of ultrafine or colloidal particles and products produced thereby |
| US5015533A (en) * | 1988-03-10 | 1991-05-14 | Texas Instruments Incorporated | Member of a refractory metal material of selected shape and method of making |
| US5403376A (en) * | 1992-03-18 | 1995-04-04 | Printron, Inc. | Particle size distribution for controlling flow of metal powders melted to form electrical conductors |
| US20050133122A1 (en) * | 2003-12-23 | 2005-06-23 | General Electric Company | High temperature alloys, and articles made and repaired therewith |
| US20050275143A1 (en) * | 2004-06-10 | 2005-12-15 | Toth Richard E | Method for consolidating tough coated hard powders |
| WO2006001791A1 (en) * | 2004-06-10 | 2006-01-05 | Allomet Corporation | Method for consolidating tough coated hard powders |
-
1943
- 1943-01-15 US US472482A patent/US2370242A/en not_active Expired - Lifetime
Cited By (41)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2464517A (en) * | 1943-05-13 | 1949-03-15 | Callite Tungsten Corp | Method of making porous metallic bodies |
| US2600995A (en) * | 1945-10-30 | 1952-06-17 | Sylvania Electric Prod | Tungsten alloy |
| US2872308A (en) * | 1948-12-07 | 1959-02-03 | Alan U Seybolt | Metal compositions |
| US2719786A (en) * | 1949-10-29 | 1955-10-04 | Rca Corp | Method of making a tungsten-nickel alloy filament |
| US2752665A (en) * | 1950-04-21 | 1956-07-03 | Baker & Co Inc | Grain stabilized metals and alloys |
| US2719797A (en) * | 1950-05-23 | 1955-10-04 | Baker & Co Inc | Platinizing tantalum |
| US2671955A (en) * | 1950-12-14 | 1954-03-16 | Mallory & Co Inc P R | Composite metal-ceramic body and method of making the same |
| US2672426A (en) * | 1950-12-14 | 1954-03-16 | Mallory & Co Inc P R | Metal-ceramic bodies and method of making |
| US2737541A (en) * | 1951-02-17 | 1956-03-06 | Roger S Coolidge | Storage battery electrodes and method of making the same |
| US2740191A (en) * | 1951-10-08 | 1956-04-03 | Ekstrand & Tholand Inc | Manufacture of plated powdered metal articles |
| US2844868A (en) * | 1954-06-01 | 1958-07-29 | Sylvania Electric Prod | Method of joining refractory metals |
| US2851381A (en) * | 1955-04-05 | 1958-09-09 | Gibson Electric Company | Simultaneous infiltrating and obtaining a brazable surface |
| US3024127A (en) * | 1958-02-14 | 1962-03-06 | Globe Ind Inc | Powder metallurgy |
| US3068016A (en) * | 1958-03-31 | 1962-12-11 | Gen Motors Corp | High temperature seal |
| US2986465A (en) * | 1958-11-12 | 1961-05-30 | Kurtz Jacob | Method of making compact high density radiation screening material containing tungsten |
| US3069288A (en) * | 1959-08-06 | 1962-12-18 | Gen Electric | Self-repairing coatings for metal |
| US3129068A (en) * | 1960-02-05 | 1964-04-14 | Owens Illinois Glass Co | Metal coated refractory and process of manufacturing same |
| US3254189A (en) * | 1961-05-15 | 1966-05-31 | Westinghouse Electric Corp | Electrical contact members having a plurality of refractory metal fibers embedded therein |
| US3140342A (en) * | 1963-07-05 | 1964-07-07 | Chomerics Inc | Electrical shielding and sealing gasket |
| US3503720A (en) * | 1966-06-24 | 1970-03-31 | Chase Brass & Copper Co | Rhenium-refractory metal alloys |
| US3463636A (en) * | 1967-01-03 | 1969-08-26 | Trw Inc | Constant conductivity alloys |
| US3407061A (en) * | 1967-05-04 | 1968-10-22 | Whittaker Corp | Metal coating process |
| US3484925A (en) * | 1967-05-23 | 1969-12-23 | Kopco Ind | Fluid compression technique for molding edm electrodes and other tungsten-based components |
| US3455023A (en) * | 1967-07-31 | 1969-07-15 | Rowe Ind Inc | Silver-carbon brush block and method of making same |
| US3713901A (en) * | 1970-04-20 | 1973-01-30 | Trw Inc | Oxidation resistant refractory alloys |
| US4018599A (en) * | 1975-09-05 | 1977-04-19 | Engelhard Minerals & Chemicals Corporation | Electrical contacts of dispersion strengthened gold |
| FR2456582A1 (en) * | 1979-05-17 | 1980-12-12 | Cheetham Jeffery | LOW SILVER METAL POWDER FOR DENTAL AMALGAMS |
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