摘要:
The invention relates to a method of manufacturing a dispenser cathode having a porous tungsten body, in which a metal oxide is provided in the body and the body is impregnated with barium. Good results as regards life and resistance to ion bombardment are obtained if the comparatively cheap oxides of gallium and indium are used.
摘要:
A method of manufacturing a scandate dispenser cathode having a matrix at least the top layer of which at the surface consists substantially of tungsten (W) and scandium oxide (Sc.sub.2 O.sub.3) and with emitter material in or below said matrix. If said method comprises the following steps:(a) compressing a porous plug of tungsten powder(b) heating said plug in a non-reactive atmosphere and in contact with scandium to above the melting temperature of scandium,(c) cooling the plug in a hydrogen (H.sub.2) atmosphere(d) pulverizing the plug to fragments(e) heating said fragments to approximately 800.degree. C. and firing them at this temperature for a few to a few tens of minutes in a hydrogen atmosphere and slowly cooling in said hydrogen atmosphere(f) grinding the fragments to scandium hydride-tungsten powder (ScH.sub.2 /W)(g) compressing a matrix or a top layer on a matrix of pure tungsten from said ScH.sub.2 /W powder or from a mixture of this powder with tungsten powder(h) sintering and cooling the said matrix(i) bringing emissive material into the cathode, a scandate dispenser cathode is obtained the recovery of which after ion bombardment occurs better than in cathodes having Sc.sub.2 O.sub.3 grains. The scandium is also distributed more homogeneously in the cathode than in cathodes having Sc.sub.2 O.sub.3 grains.
摘要翻译:一种制造钪酸盐分配器阴极的方法,其具有基体至少其表面的顶层基本上由钨(W)和氧化钪(Sc 2 O 3)构成的基体和在所述基体内或之下的发射体材料。 如果所述方法包括以下步骤:(a)压缩钨粉的多孔塞(b)将所述塞在非反应性气氛中加热并与钪接触以高于钪的熔融温度,(c)将塞冷却 氢气(H2)气氛(d)将塞子粉碎成碎片(e)将所述碎片加热至约800℃,并在该温度下在氢气气氛中将其烧制几至几十分钟,并在所述 氢气气氛(f)将碎片研磨成氢化钨 - 钨粉(ScH2 / W)(g)从所述ScH2 / W粉末或从该粉末与钨的混合物中压制纯钨基体上的基体或顶层 粉末(h)烧结和冷却所述基质(i)将发射材料引入阴极,得到钪酸盐分配器阴极,其在离子轰击之后的回收比具有Sc 2 O 3晶粒的阴极更好地发生。 钪也在阴极中分布得更均匀,而不是具有Sc2O3晶粒的阴极。
摘要:
The ink-jet printer contains an ink-jet nozzle (1) connected to a pressure chamber (5) which is recessed in a body (7) and is covered with a diaphragm (13, 15) on which a driving element (17) is fitted. The diaphragm contains an outer plate (13) on which the driving element (17) is fitted and an inner plate (15) provided with an oblong opening (19) which extends between the pressure chamber (5) and the ink-feed channel (11). The opening (19) forms a narrow passage with very accurately defined dimensions between the ink-feed channel (11) and the pressure chamber (5).
摘要:
A contact for a semiconductor cathode is produced by thermally bonding leads consisting of one of the metals Ag, Au, Cu and one of the metals Ta, Ti, V. Such a contact does not exhibit degradation when the cathode, after mounting in a vacuum tube, is heated several times to approximately 850.degree. C. for cleaning purposes.
摘要:
A dispenser cathode body is manufactured from a sintered metallic powder. A large scandium oxide concentration is provided beneath an emissive surface of the body, resulting in increased life, increased current density, and decreased sensitivity to ion bombardment.
摘要:
In an assembly of at least two electrodes which are connected together in an insulating manner, said electrodes are kept at a given distance from each other by at least one member of an electrically insulating material situated between the electrodes which comprises a core which determines the distance between the electrodes and a jacket which directly adheres to the electrode material by heating. The material of the core has a higher melting point than the material of the jacket so that the core during effecting a connection between the jacket and the electrode material maintains its shape.
摘要:
For thermocompression sealing at least one of the materials to be joined is provided with an oxide skin before or during the sealing operation. The oxide skin can be formed, for example by firing in air. It has been found that the method is particularly advantageous for seals between a CrNi-alloy and, for example a second element which consists of aluminium, for example the seal between an Al entrance window and a CrNi-steel envelope of an X-ray intensifier tube. Notably by addition of an intermediate material, in particular aluminium, seals can thus be realized between many materials.
摘要:
A display window (11) of a display tube is manufactured from a plate (21) having grooves (22), which plate is fused to a plate (20), so that ducts (25) are present in the display window (11). The phosphor screen (14) is provided on the inside of plate (20). The ducts (25) communicate at one end with a common supply duct (26) having an inlet aperture (27) and communicate at the other end with a common exhaust duct (28) having an outlet aperture (29). A coolant is forced through the ducts (25) for cooling the phosphor screen (14).
摘要:
A method of producing a low-pressure gas discharge lamp in which a body of a solid material having a thin, structure of filaments permeable to the gas discharge such as glass wool is disposed. Coherence is given to the filaments by compressing them whereafter they are sucked into the lamp envelope. Compressing, knitting together and producing the wire-shaped elements is done in a funnel-shaped space which is connected at its constricted side to the tubular discharge space.
摘要:
A gas discharge panel in which at least the electrodes serving as cathodes are separated from each other by partitions which consist of electrically oxidized aluminum strips which, like the cathodes, are also connected to a flat insulating plate by means of glaze.