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公开(公告)号：FR2445605A1
公开(公告)日：1980-07-25
申请号：FR7836487
申请日：1978-12-27
Applicant: THOMSON CSF
Inventor： CLERC GUY , SHROFF ARVIND
Abstract: A direct heating thermionic emission cathode for high frequency tubes of the diode, tetrode or pentode type. It comprises a pyrolytic graphite support and a lanthanum hexaboride-based thermoemissive material, these elements being separated by a layer which constitutes a diffusion barrier and comprises a tantalum or hafnium carbide, a metal of the platinum group or a boron compound.
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公开(公告)号：FR2498372A1
公开(公告)日：1982-07-23
申请号：FR8100782
申请日：1981-01-16
Applicant: THOMSON CSF
Inventor： CLERC GUY
Abstract: The invention provides a direct heating thermo-electronic emission cathode comprising a pyrolytic graphite support and an emissive coating formed of a mixture of tungsten and lanthanum oxide, the tungsten being transformed in its surface part into tungsten hermicarbide.
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公开(公告)号：DE3369598D1
公开(公告)日：1987-03-05
申请号：DE3369598
申请日：1983-08-17
Applicant: THOMSON CSF
Inventor： CLERC GUY , GERLACH PIERRE , HOET ROGER
Abstract: A directly-heated cathode for power electron tubes such as triodes, tetrodes or pentodes comprises a cylindrical sleeve constituted by a lattice of crossed wires forming the emissive portion of the cathode and by two conductive plates attached respectively to each end of the sleeve. In order to permit free deformation of the cathode, a flexible metallic bellows element is fixed between one of the plates and the corresponding end of the cylindrical sleeve.
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Patent Agency Ranking
公开(公告)号：DE2962924D1
公开(公告)日：1982-07-08
申请号：DE2962924
申请日：1979-11-30
Applicant: THOMSON CSF
Inventor： CLERC GUY , SHROFF ARVIND
Abstract: A direct heating thermionic emission cathode for high frequency tubes of the diode, tetrode or pentode type. It comprises a pyrolytic graphite support and a lanthanum hexaboride-based thermoemissive material, these elements being separated by a layer which constitutes a diffusion barrier and comprises a tantalum or hafnium carbide, a metal of the platinum group or a boron compound.
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公开(公告)号：FR2745951B1
公开(公告)日：1998-06-05
申请号：FR9602743
申请日：1996-03-05
Applicant: THOMSON CSF
Inventor： CLERC GUY , DE CACHARD JEAN
Abstract: A thermionic cathode, for an electron tube, includes a substrate (12) of refractory metal, a compound (14) of an element which forms the single emission layer (18) and a reducing agent (16) which reacts with the compound (14) at the cathode operating temperature to release the emission layer-forming element. The novelty is that the compound is selected from rare earth zirconates, hafnates, aluminates and berylates. Preferably, the compound (14) is neodymium zirconate, lanthanum zirconate, cerium aluminate or a mixture of rare earth compounds and the reducing agent comprises one or more refractory metal carbides. Also claimed is the production of the above cathode by (a) mixing and melting a metal oxide powder and one or more rare earth metal oxide powders under vacuum or hydrogen to produce the compound (14); and, after cooling to the solid state, (b) crushing and grinding to obtain a powder of certain particle size.
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公开(公告)号：FR2745951A1
公开(公告)日：1997-09-12
申请号：FR9602743
申请日：1996-03-05
Applicant: THOMSON CSF
Inventor： CLERC GUY , DE CACHARD JEAN
Abstract: A thermionic cathode, for an electron tube, includes a substrate (12) of refractory metal, a compound (14) of an element which forms the single emission layer (18) and a reducing agent (16) which reacts with the compound (14) at the cathode operating temperature to release the emission layer-forming element. The novelty is that the compound is selected from rare earth zirconates, hafnates, aluminates and berylates. Preferably, the compound (14) is neodymium zirconate, lanthanum zirconate, cerium aluminate or a mixture of rare earth compounds and the reducing agent comprises one or more refractory metal carbides. Also claimed is the production of the above cathode by (a) mixing and melting a metal oxide powder and one or more rare earth metal oxide powders under vacuum or hydrogen to produce the compound (14); and, after cooling to the solid state, (b) crushing and grinding to obtain a powder of certain particle size.
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公开(公告)号：DE3260969D1
公开(公告)日：1984-11-22
申请号：DE3260969
申请日：1982-01-08
Applicant: THOMSON CSF
Inventor： CLERC GUY
Abstract: The invention provides a direct heating thermo-electronic emission cathode comprising a pyrolytic graphite support and an emissive coating formed of a mixture of tungsten and lanthanum oxide, the tungsten being transformed in its surface part into tungsten hermicarbide.
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公开(公告)号：FR2532468A1
公开(公告)日：1984-03-02
申请号：FR8214894
申请日：1982-08-31
Applicant: THOMSON CSF
Inventor： CLERC GUY , GERLACH PIERRE , HOET ROGER
Abstract: A directly-heated cathode for power electron tubes such as triodes, tetrodes or pentodes comprises a cylindrical sleeve constituted by a lattice of crossed wires forming the emissive portion of the cathode and by two conductive plates attached respectively to each end of the sleeve. In order to permit free deformation of the cathode, a flexible metallic bellows element is fixed between one of the plates and the corresponding end of the cylindrical sleeve.
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