Abstract:
A scandate dispenser cathode having a cathode body (4) arranged on a cathode support (3), a cathode coating (5, 6) comprising a layer system (6) consisting of one or more alternating layers of rhenium or a rhenium alloy (61) and of scandium oxide or a scandium alloy (62), and an activation acceleration layer system (5) arranged between the cathode body (4) and the layer system (6), said activation acceleration layer system comprising at least one release layer (52) comprising alkaline earth metal oxide, preferably barium oxide, and an activator layer system (51) comprising a barrier material with greater oxidation resistance than the material of the cathode body and an activator material for reducing the alkaline earth metal oxide, preferably barium oxide.
Abstract:
A cathode electrode (cathode structure) capable of reducing an electron beam spot diameter and a cathode drive voltage, and ensuring an extended stabilization of a cathode current. A cathode electrode which is formed with a non-electron-beam-emitting dent or region (9a) in the vicinity of the center or the outer periphery of the emissive material (9) of the cathode electrode (1) to thereby emit a hollow electron beam (13), and a production method therefor; and an electron gun and a cathode ray tube.
Abstract:
The invention relates to a cathode arrangement (20) comprising: a cathode body housing an emission surface (32) for emitting electrons in a longitudinal direction (Z), wherein the emission surface is bounded by an emission perimeter (35); a focusing electrode (40) at least partially enclosing the cathode body in a transversal direction and comprising an electron transmission aperture (44) for focusing the electrons emitted by the emission surface, wherein the aperture is bounded by an aperture perimeter (45), wherein the cathode body is moveably arranged within the focusing electrode over a maximum transversal distance (d1) from an aligned position (R0), and wherein the aperture perimeter transversally extends over the emission surface and beyond the emission perimeter over an overlap distance (d2) that exceeds the maximum transversal distance.
Abstract:
The invention relates to the field of production of barium-scandate dispenser cathodes or other barium-scandate materials. A target (66) containing a mixture of BaO, CaO, Al 2 O 3 and SC 2 O 3 tends to be more stable, the higher the scandia (scandium oxide) content is. However, an increased scandia content results in a reduced emission capability. A destabilizing effect of BaO and CaO reactions is counteracted by the more inert SC 2 O 3 and also AI 2 O 3 components, as not only an increased scandia content stabilizes the material but also an increased alumina (aluminum oxide) content improves the stability.
Abstract translation:本发明涉及钡 - 钪酸盐分配器阴极或其它钡 - 钪酸盐材料的生产领域。 包含BaO,CaO,Al 2 O 3和SC 2 O 3的混合物的靶(66)倾向于更稳定,所述Scandia(钪氧化物)含量越高。 然而,增加的scandia含量会降低排放能力。 BaO和CaO反应的不稳定作用被更为惰性的SC2O3和Al2O3组分所抵消,因为不仅增加了Scandia含量,而且氧化铝(氧化铝)含量的增加也提高了稳定性。
Abstract:
A 4G magnetron is disclosed. The magnetron may include an anode, comprising a cylindrical member and anode vanes disposed within the cylindrical member which define resonant cavities therebetween, and a dispenser cathode, suitable for heating and located coaxially within said anode. The magnetron may operate in a temperature range of about 850-1050C. The magnetron may include conductive cooling. The magnetron may comprise inventive anode and cathode structures. A method for preparing a plurality of magnetron tubes substantially simultaneously is further provided.
Abstract:
A 4G magnetron is disclosed. The magnetron may include an anode, comprising a cylindrical member and anode vanes disposed within the cylindrical member which define resonant cavities therebetween, and a dispenser cathode, suitable for heating and located coaxially within said anode. The magnetron may operate in a temperature range of about 850-1050C. The magnetron may include conductive cooling. The magnetron may comprise inventive anode and cathode structures. A method for preparing a plurality of magnetron tubes substantially simultaneously is further provided.
Abstract:
A scandate dispenser cathode having a cathode body (4) arranged on a cathode support (3), a cathode coating (5, 6) comprising a layer system (6) consisting of one or more alternating layers of rhenium or a rhenium alloy (61) and of scandium oxide or a scandium alloy (62), and an activation acceleration layer system (5) arranged between the cathode body (4) and the layer system (6), said activation acceleration layer system comprising at least one release layer (52) comprising alkaline earth metal oxide, preferably barium oxide, and an activator layer system (51) comprising a barrier material with greater oxidation resistance than the material of the cathode body and an activator material for reducing the alkaline earth metal oxide, preferably barium oxide.
Abstract:
The invention relates to a cathode arrangement (20) comprising: • - a thermionic cathode comprising an emission portion (30) provided with an emission surface for emitting electrons, and a reservoir (38) for holding a material, wherein the material, when heated, releases work function lowering particles that diffuse towards the emission portion and emanate at the emission surface at a first evaporation rate; • - a focusing electrode (40) comprising a focusing surface for focusing the electrons emitted from the emission surface of the cathode; and • - an adjustable heat source (50) configured for keeping the focusing surface at a temperature at which accumulation of work function lowering particles on the focusing surface is prevented.
Abstract:
A method of manufacturing an emitter (8; 10) for a thermionic dispenser cathode, includes forming a porous emitter body with substantially interconnected pores, having an emission surface (11; 16) from which, upon application of heat, electrons are emitted. The porous emitter body is suitable for transporting through the substantially interconnected pores, a compound released upon application of heat, to the emission surface (11; 16), which compound, when deposited on the emission surface (11; 16), serves to lower an effective work function of the emitter (8; 10). The porous emitter body is formed by means of a process of deposition of material. At least a region of the porous emitter body is provided with a continuously varying porosity. The porosity is continuously varied by controlling at least one parameter of the deposition process.