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    • 22. 发明授权
    • Fast warm-up indirectly heated cathode structure
    • 快速加温间接加热阴极结构
    • US3671792A
    • 1972-06-20
    • US3671792D
    • 1969-10-29
    • ITT
    • WALTERMIRE CLAYTON L
    • H01J1/20H01J19/14
    • H01J1/20
    • A tungsten heater, covered with a thin alumina layer (about 1 mil), is potted inside a molybdenum cathode cup in a sintered mass formed from a mixture of fine particles (of the order of 1-5 microns) of molybdenum and nickel in the weight ratio of at least 40 percent molybdenum, but preferably about 90 percent moly. The emissive surface of the cup has a matrix of sintered nickel carbonyl filled with alkaline earth metal emissive oxides. The cup is supported by invar struts. The processing includes: (1) preparing a sintered nickel carbonyl matrix layer for the emissive surface of the cup; (2) ball-milling molybdenum-nickel mix with butyl carbitol, and after covering the heater therewith, inserting the heater in the cup, firing the assembly in hydrogen at between 1,150* to 1,350* C until sintered; and (3) impregnating the nickel carbonyl matrix with a mix of alkaline earth carbonates in methyl alcohol and using heat and ultrasonic vibration to compete impregnation. After assembly in tubes, activation and aging follows.
    • 将覆盖有薄氧化铝层(约1密耳)的钨加热器浸在由钼和镍的微粒(约1-5微米级)的混合物形成的烧结体中的钼阴极杯内, 重量比为至少40%的钼,但优选为约90%的钼。 杯子的发射表面具有填充有碱土金属发射氧化物的烧结镍羰基体。 杯子由invar struts支撑。
    • 30. 发明授权
    • Grid controlled electron source and method of making same
    • 电网控制电子源及其制作方法
    • US3967150A
    • 1976-06-29
    • US545867
    • 1975-01-31
    • Erling L. LienGeorge V. MiramRichard B. Nelson
    • Erling L. LienGeorge V. MiramRichard B. Nelson
    • H01J1/28H01J1/88H01J9/04H01J19/14H01J23/06H01J23/065H01J1/20
    • H01J19/14H01J23/065
    • A grid-controlled electron source comprises an apertured grid spaced in front of a thermionic cathode. Areas of the cathode directly behind the grid conductors are made non-emissive by a bonded surface layer of non-emissive material such as zirconium. On porous metal cathodes impregnated with active emitting material the metal surface may be sealed with a dense layer of inactive metal under the non-emissive layer to prevent chemical reaction of the latter with the emitting material.Methods of depositing the surface layers in the desired pattern include coating the cathode's entire large-scale surface contour, followed by machining small concave dimples into the surface, thereby removing the non-emissive layer from the dimpled surfaces from which small beamlets of electrons are focused between the grid conductors without grid interception.Another method is to mask the desired non-emissive areas with an apertured mask having solid elements registered with the desired positions of the grid conductors. The surface behind the mask apertures is coated with an inactive powder, then the mask is removed and the non-emissive layer or layers deposited in the uncoated, previously masked paths. Lastly, the inactive powder is removed, uncovering the emissive surface areas.
    • 栅格控制的电子源包括在热离子阴极前面间隔开的有孔网格。 直接在栅格导体之后的阴极的区域由非发射材料如锆的结合表面层而不发射。 在浸渍有活性发射材料的多孔金属阴极上,金属表面可以在非发射层下方的非活性金属致密层密封,以防止其与发射材料的化学反应。