Abstract:
It is described an oxygen dispenser for use in high pressure discharge lamps. The oxygen dispenser of the invention comprises a metallic container capable of retaining solid materials but allowing an easy passage of gas, containing silver oxide. Several possible types of dispenser are proposed. The dispenser has shown capable of avoiding the formation of black deposits coming from hydrocarbons inside the lamps.
Abstract:
A method is disclosed for the manufacture of a supported thin layer of getter material, comprising: preparing at least one suspension of NEG material particles, with a particle size lower than about 150 mu m, in a dispersing medium having an aqueous, alcoholic or hydroalcoholic base, containing a weight percentage of organic compounds, having a boiling temperature higher than 250 DEG C, which is lower than 1 %, wherein the ratio of the NEG material weight to the weight of dispersing medium is comprised between 4:1 and 1:1; depositing at least one layer of NEG material suspension onto a metal carrier by serigraphic technique; drying the thus obtained deposit by allowing the volatile components to evaporate; and sintering in a vacuum oven the dried deposit at a temperature comprised between 800 and 1000 DEG C and operating under vacuum, covering the deposit by means of a material not suffering from physical or chemical alterations under vacuum at any process temperature. It is also disclosed a getter device obtained according to such a method.
Abstract:
An improved high-capacity getter pump, comprising a plurality of porous sintered piled-up annuli made from a non-evaporable getter material and having: (i) a first planar surface having a central hole; (ii) a second planar surface, having a broader central hole, parallel to said first surface and spaced therefrom by a distance "d" of 1-10.5 mm; (iii) a third intermediate planar surface, interposed between said first and second surfaces, spaced from said first surface by a thickness "t" of 0.5-5.0 mm and having a hole coincident with the hole of said first surface; wherein the first surface of a subsequent annulus is in contact with the second surface of a preceding annulus and wherein the first surface of a subsequent annulus is spaced from the third surface of a preceding annulus by a gas conductance having a height "c" of 0.5-10 mm.
Abstract:
Process for evacuating the thermally insulating jacket (5) of a dewar (1) having an inner wall (2) and an outer wall (4), with the inner space between said walls completely or partially filled with an insulating material (9), containing also a moisture sorbing material (10) and a getter material (11), in which said moisture sorbing material is a chemical drying agent, and said getter material is a Ba-Li alloy.
Abstract:
A process for manufacturing shields of different size for fluorescent lamps consists in the steps of: providing a support for powders in the form of a metallic strip having a width (L) equivalent to about the circumference of the smallest shield to be manufactured; depositing on said support strip at least one track of getter material and at least another of mercury releasing materials in powdered form; and producing pieces of the support strip by cutting the same with parallel cuts having a pitch (D) and at an angle ( alpha ) with respect to the central axis (X-X) of the strip which are both varying according to the desired size of the shield.
Abstract:
A process for preparing calcium oxide, strontium oxide or barium oxide consists in the treatment of the corresponding hydroxides following the reactions (I): Ca(OH)2 } CaO + H2O; (II): Sr(OH)2 } SrO + H2O; (III): Ba(OH)2 } BaO + H2O; at temperatures comprised between 400 and 900 DEG C during a time between 1 and 15 hours under vacuum or in an inert gas atmosphere. Preferably said reaction is caused to take place in a capsule with at least a portion of surface being permeable to the gas flow.
Abstract translation:制备氧化钙,氧化锶或氧化钡的方法包括在反应(I):Ca(OH)2} CaO + H 2 O之后处理相应的氢氧化物。 (II):Sr(OH)2} SrO + H 2 O; (III):Ba(OH)2} BaO + H 2 O; 在400-900℃的温度下,在真空下或在惰性气体气氛中,在1-15小时之间。 优选地,使所述反应发生在胶囊中,其中至少一部分表面对气流是可渗透的。
Abstract:
There is described a method for creating and keeping a controlled atmosphere in a FED, essentially free of oxidizing gases and including hydrogen at a pressure comprised between 10 and 10 mbar, which comprises the step of arranging inside the FED, before it is frit sealed, a getter material previously charged with hydrogen gas. Subsequently, the two parts forming the FED are frit sealed along their perimeter and the FED itself is evacuated during this operation or later, through a suitably arranged tail, which is hermetically closed after being evacuated through a "tip-off". The getter material is charged by exposing it to hydrogen gas at a pressure comprised between 10 and 2 bar.
Abstract:
Field emitter flat display, having an inner vacuum space wherein there are housed: a) a layer of excitable phosphors and a plurality of microcathodes (MT), which emit electrons driven by a high electric field; and b) a plurality of electric feedthroughs (P) and a vacuum stabilizer (G). Said vacuum stabilizer (g) is essentially formed of a porous supported layer of a non-evaporable getter material, 20 to 180 mu m thick, housed in a zone essentially free from microcathodes, phosphors and feedthroughs.
Abstract:
A process for the removal of impurities from a stream of hydrogen, containing more easily removable impurities, like for instance COx, and more hardly removable impurities, mainly consisting of nitrogen and/or methane, wherein: A. said stream is first brought into contact, at 5-50 DEG C, with a material containing nickel and/or Ni compounds, wherein at least 1 % b.w. of the overall amount of Ni is present in reduced form; B. the stream from (A), still containing said more hardly removable impurities, is brought into contact with a non-evaporable getter material at a higher temperature.
Abstract:
An improved high-capacity getter pump, suitable for creating and maintaining the vacuum, comprising a plurality of porous sintered blades made from a non-evaporable getter material and having a first main surface; a second main surface, parallel to said first surface and spaced therefrom by a thickness of 0.5-5.0 mm; wherein said blades are arranged in a housing and are separated from each other by a gas conductance, with the adjacent surfaces of adjacent blades being spaced from each other by a distance of 0.5-10 mm.