GB940063A - Improvements in or relating to the manufacture of thermionic cathodes - Google Patents
Improvements in or relating to the manufacture of thermionic cathodesInfo
- Publication number
- GB940063A GB940063A GB241659A GB241659A GB940063A GB 940063 A GB940063 A GB 940063A GB 241659 A GB241659 A GB 241659A GB 241659 A GB241659 A GB 241659A GB 940063 A GB940063 A GB 940063A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carbonate
- strip
- nickel
- particles
- support
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G3/00—Resilient suspensions for a single wheel
- B60G3/18—Resilient suspensions for a single wheel with two or more pivoted arms, e.g. parallelogram
- B60G3/20—Resilient suspensions for a single wheel with two or more pivoted arms, e.g. parallelogram all arms being rigid
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
-
- 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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
- B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
940,063. Cathode materials and processing. MULLARD Ltd. Oct. 30, 1959 [Jan. 22, 1959; July 13, 1959], Nos. 2416/59 and 23976/59. Heading H1D. In a method of manufacturing a thermionic cathode having a coating of a double or triple alkaline-earth metal carbonate on a nickel or nickel alloy support, a layer, one particle thick, of closely-spaced nickel particles is sintered to the support, the interstices between the particles are filled with carbonate and pressure is applied to cold-weld the nickel particles to the support and to deform them so that the compacted carbonate is retained in re-entrant cavities between the particles and in contact with the support. In a preferred method, a nickel or nickel alloy strip, containing reducing agents such as magnesium and aluminium, is first coated with an adhesive film either in a continuous strip or in circular or rectangular patches and carbonyl nickel particles about 10 microns in diameter are applied from a magnetic container to the adhesive film and sintered to the strip at 1100 ‹ C. in an atmosphere of 90% hydrogen and 10% nitrogen, the adhesive being removed completely during this process. Next, a triple alkaline earth carbonate, with a Ba: Sr: Ca ratio of 47 : 43 : 10 and which has been soft-sintered, after being precipitated by sodium carbonate, at 600‹ C. for 5 minutes into soft chalk-like sticks, is applied to the strip which is afterwards rubbed to ensure the application of carbonate in all the spaces between the nickel particles and to remove any excess carbonate. Finally, the strip is compressed at 60 tons/sq, inch, the carbonate and nickel particle layer then having a thickness of about 6¢ microns, and passed into a machine which divides up and forms the coated strip into tubular cathodes of rectangular or circular cross-section or cathodes of the type shown in Figs. 10 and 12, the cathode of Fig. 10 comprising two similar parts welded together. In an alternative method, instead of compressing the entire strip, the entire strip may be coated and only those portions which are required as emissive surfaces are compressed, e.g. by means of an appropriately shaped punch, the uncompressed portions of carbonate being removed by a blast of air. In a further embodiment the cathode supports are formed before the emissive coating is applied.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL112717D NL112717C (en) | 1959-01-22 | ||
| DED2309D DE893759C (en) | 1942-08-27 | 1942-08-27 | Suspension of axle units with split axles (ú ¢ rigid semi-axles) |
| GB241659A GB940063A (en) | 1959-01-22 | 1959-01-22 | Improvements in or relating to the manufacture of thermionic cathodes |
| US2030A US3110081A (en) | 1959-01-22 | 1960-01-12 | Manufacture of thermionic bodies |
| DEN17773A DE1102288B (en) | 1959-01-22 | 1960-01-19 | Process for the production of an oxide cathode for electrical discharge tubes |
| FR816361A FR1245979A (en) | 1959-01-22 | 1960-01-22 | Oxide cathode and its manufacturing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB241659A GB940063A (en) | 1959-01-22 | 1959-01-22 | Improvements in or relating to the manufacture of thermionic cathodes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB940063A true GB940063A (en) | 1963-10-23 |
Family
ID=9739178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB241659A Expired GB940063A (en) | 1942-08-27 | 1959-01-22 | Improvements in or relating to the manufacture of thermionic cathodes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB940063A (en) |
-
1959
- 1959-01-22 GB GB241659A patent/GB940063A/en not_active Expired
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