Abstract:
1,203,707. Ceramic-metal seals. TOKYO SHIBAURA ELECTRIC CO. Ltd. 11 Dec., 1968 [11 Dec., 1967 (2)], No.58895/68. Heading B3V. [Also in Division H1] A metal strip 11 is adhesively bonded to a ceramic substrate 1, which is desirably porous in the region of the bond, by an adhesive agent which is free from material such as carbon and lead which would permeate the ceramic, for example soldering-glass containing a small amount of bentonite. After the adhesive agent is applied, the substrate and metal strip are heated for 10 minutes at 1100‹ C. in an inert atmosphere, e.g. nitrogen or argon, to complete the bond. The metal is an alloy of Ni-Fe or Fe-Co-Ni.
Abstract:
A directly heated oxide cathode comprises a base metal of alloy containing Ni as a host material, an electron emissionable oxide of alkaline earth metal deposited on the base metal, and powders of metal selected from Ni sample substance, Co simple substance, Ni-Co alloy, alloy containing Ni, Ni-Co, or Co as a host material, and alloy containing Ni as a host material and a reducing agent such as Zr, deposited on both sides of the base metal onto which the oxide is deposited. Provision of the powders of metal on both sides can minimize deformation of the base metal and prevent peeling of the oxide from the cathode effectively. Provision of a reducing agent in the powders of metal further assures a sufficient supply of the reducing agent to the oxide, thereby effectively maintaining the electron emissionability and life of the oxide for a longer period of time.
Abstract:
In a reticulated grid cathode which has a flexible connection at one end to the conductor for the filament current present inside the cathode, the flexible connection consists of a number of thin metal strips of the same thickness. The strips constitute an approximately semi-circular arc and each consist of two strips of preferably the same thickness. In order to minimize the bending stress occurring in the strips, the diameter of the arc formed by the strips is chosen to be as large as possible relative to the radial dimensions of the cathode.
Abstract:
Methods and apparatus are provided for igniting, modulating, and sustaining a plasma for various plasma processes and treatments. In one embodiment, a plasma is ignited by subjecting a gas in a multi-mode processing cavity to electromagnetic radiation having a frequency between about 1 MHz and about 333 GHz in the presence of a plasma catalyst, which may be passive or active. A passive plasma catalyst may include, for example, any object capable of inducing a plasma by deforming a local electric field. An active plasma catalyst can include any particle or high energy wave packet capable of transferring a sufficient amount of energy to a gaseous atom or molecule to remove at least one electron from the gaseous atom or molecule, in the presence of electromagnetic radiation.
Abstract:
An alloy wire consisting essentially of a single phase solid solution of tungsten and about 0.2 to about 6 percent by weight tantalum includes grain controlling additives. The alloy wire may be used in lamps as a filament or as a gettering component.
Abstract:
Die Erfindung bezieht sich auf eine direkt geheizte Kathode für Elektronenröhren, insbesondere Senderöhren, mit koaxialem Aufbau der Elektroden und deren Durchführungen, die einen Hohlzylinder (1) aufweist, der an einem Ende an einer ringförmigen Kathodenzuführung (12) und am anderen Endean einerKathodenkappe (9) befestigt ist, die an einer koaxial in dem Hohlzylinder (1) verlaufenden Stromzuführung (5) gehaltert ist. Bei dieser Kathode soll der Träger nicht aus Draht bestehen, so daß Inhomogenitäten auf der Kathodenoberfläche vermieden sind. Die Erfindung sieht hierzu vor, daß der Hohlzylinder (1) aus pyrolytischem Graphit besteht und mit einer dünnen Metallschicht (10), vorzugsweise aus Wolframkarbid und Thorium bzw. einem Thoriumoxid, überzogen ist. Eine erfindungsgemäße Kathode wird insbesondere bei Senderöhren verwendet (Fig. ).