EP0143222A1 - Cathode thermionique à haut pouvoir emissif pour tube électronique et son procédé de fabrication - Google Patents
Cathode thermionique à haut pouvoir emissif pour tube électronique et son procédé de fabrication Download PDFInfo
- Publication number
- EP0143222A1 EP0143222A1 EP84110730A EP84110730A EP0143222A1 EP 0143222 A1 EP0143222 A1 EP 0143222A1 EP 84110730 A EP84110730 A EP 84110730A EP 84110730 A EP84110730 A EP 84110730A EP 0143222 A1 EP0143222 A1 EP 0143222A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hot cathode
- carrier
- substance
- activation
- alloy
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000126 substance Substances 0.000 claims abstract description 36
- 230000004913 activation Effects 0.000 claims abstract description 18
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 239000011148 porous material Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 9
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 7
- 229910052788 barium Inorganic materials 0.000 claims abstract description 6
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 6
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000000737 periodic effect Effects 0.000 claims abstract description 4
- 230000008595 infiltration Effects 0.000 claims abstract 2
- 238000001764 infiltration Methods 0.000 claims abstract 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 20
- 230000003213 activating effect Effects 0.000 claims description 14
- 229910052697 platinum Inorganic materials 0.000 claims description 8
- 229910052721 tungsten Inorganic materials 0.000 claims description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 239000010937 tungsten Substances 0.000 claims description 5
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 4
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- 238000001962 electrophoresis Methods 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 230000001427 coherent effect Effects 0.000 claims 1
- 239000013354 porous framework Substances 0.000 claims 1
- 239000003870 refractory metal Substances 0.000 claims 1
- 238000009713 electroplating Methods 0.000 abstract 1
- 229910000600 Ba alloy Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 5
- 229910001252 Pd alloy Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000020 Nitrocellulose Substances 0.000 description 3
- -1 Platinum Metals Chemical class 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 239000012300 argon atmosphere Substances 0.000 description 3
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 229920001220 nitrocellulos Polymers 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 229910001260 Pt alloy Inorganic materials 0.000 description 2
- 229910000929 Ru alloy Inorganic materials 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- 229940072049 amyl acetate Drugs 0.000 description 2
- PGMYKACGEOXYJE-UHFFFAOYSA-N anhydrous amyl acetate Natural products CCCCCOC(C)=O PGMYKACGEOXYJE-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- MNWFXJYAOYHMED-UHFFFAOYSA-M heptanoate Chemical compound CCCCCCC([O-])=O MNWFXJYAOYHMED-UHFFFAOYSA-M 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910000858 La alloy Inorganic materials 0.000 description 1
- 229910003192 Nb–Ta Inorganic materials 0.000 description 1
- 229910000820 Os alloy Inorganic materials 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 229910008484 TiSi Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- KZBODYTXULRMBT-UHFFFAOYSA-N [Ba].[Pt] Chemical compound [Ba].[Pt] KZBODYTXULRMBT-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- WTDPMEQSZXQVDG-UHFFFAOYSA-N lanthanum platinum Chemical compound [La].[Pt] WTDPMEQSZXQVDG-UHFFFAOYSA-N 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/14—Solid thermionic cathodes characterised by the material
Definitions
- the invention relates to a hot cathode for an electron tube according to the preamble of claim 1 and to a method for its production according to the preamble of the claim
- Glow cathodes for electron tubes are known in numerous types of functions and material combinations. Barium oxide cathodes with good yield were frequently used for small outputs.
- the thoraxed tungsten cathodes (System Th0 2 / W Z C / W) with or without additional additives are used as high-performance cathodes.
- cathodes delivering high emission current densities (thoriated tungsten cathode, lanthanum hexaboride cathode) operate at high operating temperatures (1700 to 2000 K), which leads to the limits of the permissible mechanical stresses. Since the heat resistance of the materials used can no longer be increased significantly, the design and process engineering involved in the production of hot cathode vessels is considerable. Because of its brittleness, lanthanum hexaboride in particular cannot be given any desired and desirable geometric shape.
- the invention has for its object to provide a hot cathode with high emissivity and a method for its production, which has a long life and high heat resistance at high emission current density in continuous operation, consists of the most ductile material that can be easily processed, does not tend to embrittlement and is simple Can be produced in any geometrically appropriate form.
- the hot cathode is said to be particularly in the form of thin wires and wire mesh shockproof structure to be executable.
- the operating temperature should be as low as possible.
- the basic characteristic of the new hot cathode is that the activation substance which promotes electron emission has a metallic character both as a supply and as an emissive surface layer and can in principle be present on any support. So there are no chemical reactions or thermal decomposition of a non-metallic substance. This allows a practically unlimited amount of activating substance to be accommodated on the carrier or in the carrier. In addition, in the case of a metallic carrier, this material allows for practically unproblematic further processing into thin wires, strips and sheets. In contrast, however, the proposed system also allows the activation substance to be accommodated on or in a ceramic carrier, if this results in particular advantages. In this case, the carrier must of course be brought into its final form beforehand.
- An alloy of barium and platinum was used as the activation substance.
- it is the barium platinum Ba Pt S.
- Weighed amounts of barium and platinum were melted down in the correct stoichiometric ratio in an arc furnace under an inert gas atmosphere of argon. The melt was cooled to solidify brought and crushed in the mortar. The fragments were ground in a ball mill with a tungsten carbide lining and tungsten carbide balls to a powder with a particle size of at most 1 ⁇ m. Then the powder was mixed with nitrocellulose and amyl acetate to form a thin slurry.
- This suspension was applied to a tungsten wire of 0.5 mm diameter by rolling in a layer thickness of 100 .mu.m and dried.
- the 100 mm long coated wire was clamped into a hot cathode vessel using a cathode holder and the latter was evacuated to a residual gas pressure of less than 10-4 m bar.
- the wire was slowly heated to a temperature of about 800 K, the nitrocellulose being decomposed and the decomposition products leaving the reaction space. After a holding time of 20 minutes, the vacuum was brought to a residual gas pressure of less than 10 m bar and the wire was further heated to a temperature of 1400 K. After a formation time of 15 minutes, the full stationary emission current density of 4 A / cm 2 was reached and maintained.
- the cathode was not very sensitive to vacuum.
- the emission current density of 4 A / cm 2 could be kept unchanged in continuous operation even if the vacuum deteriorated to a residual gas pressure of approx. 3 10-4 m bar.
- the formation of the barium-rich platinum Ba Pt 2 together with free platinum was found on the cathode surface. Hence, a new chemical-thermodynamic equilibrium occurred, which then remained unchanged over the entire operating period until the activation substance was exhausted. The achievable emission current density was not affected by this.
- Example I an alloy corresponding to the intermetallic compound Ba Pt 2 was first melted, cooled, solidified, crushed in a mortar and ground in a ball mill to a fine-grained powder. This powder was then slurried finely in a suitable bath and cataphoretically applied to a molybdenum wire of 0.5 mm diameter in a layer thickness of 50 ⁇ m. The coated wire was subsequently subjected to an annealing treatment at a temperature of 1400 ° C. for 10 minutes under an argon atmosphere, the Ba Pt 2 particles being firmly connected to the support and to one another by sintering. By alternately cataphoretic deposition and sintering treatment, surface layers of any thickness can be achieved.
- the coated molybdenum wire was tested as a hot cathode and, at a temperature of 1400 K, gave a stationary emission current density of 4 A / cm.
- Example I Based on Example I, an alloy of lanthanum and platinum was used. It was the lanthanum platinum La Pt 2 . Corresponding stoichiometric amounts of lanthanum and platinum were melted together in an arc furnace under an argon atmosphere and, after the melt had solidified, crushed in a mortar and ground to a fine-grained powder. The application to a tungsten wire with the aid of nitrocellulose and amyl acetate was carried out in exactly the same way as described in Example I. The coated wire was at a temperature of about 800 K. and degassed a residual gas pressure of less than 10 -4 m bar for 20 min.
- the residual gas pressure of the vacuum was then reduced to a value of less than 10 -5 m bar and the temperature of the wire was raised to 1850 K. After a formation time of 10 minutes, an emission current density of 5.5 A / cm 2 was achieved in the hot cathode vessel. This value was also kept in steady-state operation without waste.
- the activating substance was an alloy of barium and palladium, which corresponded approximately to the composition of the intermetallic compound Ba Pd 5 . It was melted by mixing the components in an arc furnace under an argon atmosphere. An open-pore round rod with a diameter of 10 mm was made from molybdenum with a pore volume of 25% by powder metallurgy. The molybdenum body, together with the molten Ba / Pd alloy, was placed in a vacuum-tight casting device and brought to a temperature of 1700 ° C. After a dwell time of 15 min under vacuum, the casting device was flooded with argon at a pressure of 10 bar and the temperature was maintained for 30 min.
- the Ba / Pd alloy infiltrated the porous molybdenum body and completely filled its pores. After cooling, the rod was turned over and heated again to 1100 ° C. A series of hot forming operations with intermediate annealing was then carried out under a protective gas atmosphere, which consisted of round hammering and drawing into a wire with a diameter of 0.8 mm.
- the finished molybdenum wire doped with the Ba / Pd alloy was inserted into a hot cathode vessel and operated at a temperature of 1350 K under vacuum with a residual gas pressure of 10-4 m bar.
- the measured emission current density was sta in continuous operation stationary 2 A / cm 2 . After a while, the formation of Ba Pd 2 was observed on the cathode surface.
- the activation substance which roughly corresponded to the intermetallic compound Ba Ru 2 .
- the alloy was melted from the components in a vacuum in an induction furnace and solidified.
- the carrier consisted of a porous hollow cylinder made of sintered zirconium oxide stabilized with yttrium oxide and having an outside diameter of 12 mm and an inside diameter of 6 mm.
- the pore volume of the open-pore sintered body was 30%. The latter was packed into the pulverized activation substance on all sides and the whole thing was placed in a vacuum vessel and heated inductively to 2000 ° C.
- the Ba / Ru alloy melted and penetrated into the pores of the sintered body.
- the vessel was additionally flooded with argon under a pressure of 10 bar for 20 minutes. After the infiltrated sintered body had cooled, it was slightly turned on the outside and inside to remove adhering alloy residues. In addition, a 5 ⁇ m thick ruthenium layer was electroplated on the outer surface to bridge the non-metallic surface areas delimited by the sintered body. Thereupon the whole was annealed for 1 h at a temperature of 1500 ° C under vacuum. The cathode provided with a tungsten filament for heating inside was installed in an electron tube and operated under vacuum with a residual gas pressure of 10 -5 m bar at a temperature of 1500 K. The measured emission current density in steady operation was 10 A / cm 2 .
- the carrier can consist of a heat-resistant metallic or ceramic body with a pore volume of 10 to 50%, the pores of which are completely filled with the activating substance.
- Particularly suitable are the high-melting metals W, Mo, Ta, Nb or alloys of at least two of these metals. They have the advantage of being ductile and can be further processed as scaffolding materials in any shape, such as wire, tape, sheet metal, etc. Ceramic materials with a high melting point, such as zrO 2 stabilized with Y 2 O 3 , can also be used. Alloys of the metals of the VIII.
- the alloy components therefore include on the one hand the ferrous metals, above all nickel and the platinum metals, above all platinum, on the other hand the elements Ba, Ca, La, Y, Gd, Ce, Th, U etc.
- Platinides of Ba and / or La have proven to be particularly advantageous, including Ba Pt 5 and / or Ba Pt 2 or La Pt 5 and / or La Pt 3 and / or La Pt 2 .
- the alloys in question can also be mixed, that is to say in the majority. However, at least one of the aforementioned alloys and / or intermetallic compounds should be present as an activation substance.
- the activation substance used as an alloy and / or intermetallic compound is applied to the carrier either by a wet mechanical method (application as a paste with suitable chemical substances or cataphoresis) or by a chemical method (for example electroless deposition, co-precipitation, etc.) and then forms the edge zone of the hot cathode body.
- Another method is to melt-activate the activating substance, i.e. to infiltrate in the liquid state into the porous carrier (open-pore body), a body having the same structure over the entire cross section being obtained as the hot cathode.
- the infiltrated body can subsequently be subjected to hot deformation by extrusion, rotary hammering, drawing or rolling, provided that a ductile material is used as the carrier.
- the two methods can also be used in combination.
- the advantages lie in the comparatively simple production method and in the low operating temperature of the cathode (in particular for barium alloys as an activating substance) and, at the same time, in the long service life compared to conventional cathodes (large supply of activating substance).
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Solid Thermionic Cathode (AREA)
- Electroplating Methods And Accessories (AREA)
- Discharge Lamp (AREA)
- Powder Metallurgy (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT84110730T ATE30811T1 (de) | 1983-09-30 | 1984-09-08 | Gluehkathode mit hohem emissionsvermoegen fuer eine elektronenroehre und verfahren zu deren herstellung. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH5320/83 | 1983-09-30 | ||
| CH532083 | 1983-09-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0143222A1 true EP0143222A1 (fr) | 1985-06-05 |
| EP0143222B1 EP0143222B1 (fr) | 1987-11-11 |
Family
ID=4291602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84110730A Expired EP0143222B1 (fr) | 1983-09-30 | 1984-09-08 | Cathode thermionique à haut pouvoir emissif pour tube électronique et son procédé de fabrication |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4752713A (fr) |
| EP (1) | EP0143222B1 (fr) |
| AT (1) | ATE30811T1 (fr) |
| DE (1) | DE3467467D1 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0720195A1 (fr) * | 1994-12-28 | 1996-07-03 | Samsung Display Devices Co., Ltd. | Cathode à chauffage direct et son procédé de fabrication |
| US5580291A (en) * | 1994-06-22 | 1996-12-03 | Siemens Aktiengesellschaft | Method for manufacturing a glow cathode for an electron tube |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8701739A (nl) * | 1987-07-23 | 1989-02-16 | Philips Nv | Oxydekathode. |
| DE4026301A1 (de) * | 1990-08-20 | 1992-02-27 | Siemens Ag | Elektronenemitter einer roentgenroehre |
| DE4026298A1 (de) * | 1990-08-20 | 1992-02-27 | Siemens Ag | Roentgenroehre mit einem elektronenemitter |
| DE4026299A1 (de) * | 1990-08-20 | 1992-02-27 | Siemens Ag | Roentgenanordnung mit einem roentgenstrahler |
| KR100442300B1 (ko) * | 2002-01-04 | 2004-07-30 | 엘지.필립스디스플레이(주) | 음극선관용 음극 |
| DE102008020163A1 (de) * | 2008-04-22 | 2009-10-29 | Siemens Aktiengesellschaft | Kathode |
| US20090284124A1 (en) * | 2008-04-22 | 2009-11-19 | Wolfgang Kutschera | Cathode composed of materials with different electron works functions |
| US8385506B2 (en) | 2010-02-02 | 2013-02-26 | General Electric Company | X-ray cathode and method of manufacture thereof |
| US8938050B2 (en) | 2010-04-14 | 2015-01-20 | General Electric Company | Low bias mA modulation for X-ray tubes |
| JP5527224B2 (ja) * | 2011-01-14 | 2014-06-18 | ウシオ電機株式会社 | ショートアーク型放電ランプ |
| US9922791B2 (en) | 2016-05-05 | 2018-03-20 | Arizona Board Of Regents On Behalf Of Arizona State University | Phosphorus doped diamond electrode with tunable low work function for emitter and collector applications |
| US10121657B2 (en) | 2016-05-10 | 2018-11-06 | Arizona Board Of Regents On Behalf Of Arizona State University | Phosphorus incorporation for n-type doping of diamond with (100) and related surface orientation |
| US10704160B2 (en) | 2016-05-10 | 2020-07-07 | Arizona Board Of Regents On Behalf Of Arizona State University | Sample stage/holder for improved thermal and gas flow control at elevated growth temperatures |
| RU2627707C1 (ru) * | 2016-08-02 | 2017-08-10 | Акционерное общество "Научно-производственное предприятие "Исток" имени А.И. Шокина" (АО "НПП "Исток" им. Шокина") | Способ получения прессованного металлосплавного палладий-бариевого катода |
| RU2647388C2 (ru) * | 2016-08-02 | 2018-03-15 | Акционерное общество "Научно-производственное предприятие "Исток" имени А.И. Шокина" (АО "НПП "Исток" им. Шокина") | Прессованный металлосплавный палладий-бариевый катод и способ его получения |
| RU2627709C1 (ru) * | 2016-08-02 | 2017-08-10 | Акционерное общество "Научно-производственное предприятие "Исток" имени А.И. Шокина" (АО "НПП "Исток" им. Шокина") | Способ получения катодного сплава на основе металла платиновой группы и бария |
| US10418475B2 (en) | 2016-11-28 | 2019-09-17 | Arizona Board Of Regents On Behalf Of Arizona State University | Diamond based current aperture vertical transistor and methods of making and using the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR661813A (fr) * | 1927-12-31 | 1929-07-30 | Etablissements Ind De E C Gram | Cathode à grand pouvoir émissif pour tube à vide à émission électronique |
| US1836990A (en) * | 1927-12-01 | 1931-12-15 | Ass Elect Ind | Manufacture of electron-emitting bodies |
| DE1211724B (de) * | 1963-06-07 | 1966-03-03 | Telefunken Patent | Gepresste Matrixkathode fuer elektrische Entladungsroehren |
| FR2425144A1 (fr) * | 1978-05-05 | 1979-11-30 | Bbc Brown Boveri & Cie | Materiau pour cathode incandescente |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3684912A (en) * | 1970-10-22 | 1972-08-15 | Sylvania Electric Prod | Tungsten-alloy electrode with brazable leads integral with emitter head |
| US4019081A (en) * | 1974-10-25 | 1977-04-19 | Bbc Brown Boveri & Company Limited | Reaction cathode |
| CH629033A5 (de) * | 1978-05-05 | 1982-03-31 | Bbc Brown Boveri & Cie | Gluehkathode. |
| JPS6023454B2 (ja) * | 1978-11-29 | 1985-06-07 | 株式会社日立製作所 | 電子管陰極 |
| FR2445605A1 (fr) * | 1978-12-27 | 1980-07-25 | Thomson Csf | Cathode a chauffage direct et tube electronique haute frequence comportant une telle cathode |
| JPS5596531A (en) * | 1979-01-19 | 1980-07-22 | Hitachi Ltd | Directly heated cathode for electron tube |
| FR2462782A1 (fr) * | 1979-08-03 | 1981-02-13 | Thomson Csf | Procede de realisation d'une couche contenant du silicium et dispositif de conversion photoelectrique mettant en oeuvre ce procede |
| FR2469792A1 (fr) * | 1979-11-09 | 1981-05-22 | Thomson Csf | Cathode thermo-ionique, son procede de fabrication et tube electronique incorporant une telle cathode |
| DE3148441A1 (de) * | 1981-12-08 | 1983-07-21 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Verfahren zur herstellung einer thermionischen kathode |
| JPS58133739A (ja) * | 1982-02-03 | 1983-08-09 | Hitachi Ltd | 含浸型陰極 |
-
1984
- 1984-09-08 DE DE8484110730T patent/DE3467467D1/de not_active Expired
- 1984-09-08 EP EP84110730A patent/EP0143222B1/fr not_active Expired
- 1984-09-08 AT AT84110730T patent/ATE30811T1/de not_active IP Right Cessation
-
1987
- 1987-03-05 US US07/023,917 patent/US4752713A/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1836990A (en) * | 1927-12-01 | 1931-12-15 | Ass Elect Ind | Manufacture of electron-emitting bodies |
| FR661813A (fr) * | 1927-12-31 | 1929-07-30 | Etablissements Ind De E C Gram | Cathode à grand pouvoir émissif pour tube à vide à émission électronique |
| DE1211724B (de) * | 1963-06-07 | 1966-03-03 | Telefunken Patent | Gepresste Matrixkathode fuer elektrische Entladungsroehren |
| FR2425144A1 (fr) * | 1978-05-05 | 1979-11-30 | Bbc Brown Boveri & Cie | Materiau pour cathode incandescente |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5580291A (en) * | 1994-06-22 | 1996-12-03 | Siemens Aktiengesellschaft | Method for manufacturing a glow cathode for an electron tube |
| EP0720195A1 (fr) * | 1994-12-28 | 1996-07-03 | Samsung Display Devices Co., Ltd. | Cathode à chauffage direct et son procédé de fabrication |
| US5773922A (en) * | 1994-12-28 | 1998-06-30 | Samsung Display Devices, Co., Ltd. | Direct heating cathode and process for producing such |
Also Published As
| Publication number | Publication date |
|---|---|
| US4752713A (en) | 1988-06-21 |
| DE3467467D1 (en) | 1987-12-17 |
| ATE30811T1 (de) | 1987-11-15 |
| EP0143222B1 (fr) | 1987-11-11 |
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