摘要:
A hollow cathode having at least a portion of the inner, outer or both surfaces coated with a layer of a getter material is described. Some methods for the production of the hollow cathode of the invention are also described, which include cathodic and electrophoretic deposition of the getter layer onto the hollow cathode.
摘要:
Compositions containing getter material and getter devices for which gettering activity can be activated to applied temperatures that are lower than those temperatures required for activating the getter material alone are disclosed. In one aspect, a getter composition that includes a getter component and an activator component is provided. The getter component is selected from the group consisting of evaporable and non-evaporable getter materials. The activator component is effective to heat said getter material to a temperature greater than about 500° C. when said activator material is heated to a temperature of between about 280° C. and about 500° C. In some embodiments, the activator component is effective to bring the temperature of the getter material to greater than about 1,000° C. These materials can be used in devices and locations for which low applied activation temperatures are required.
摘要:
Nonevaporable getter alloys containing Zr, Co, and a third component A selected from the rare each metals and mixtures thereof, e.g., mischmetal. A most preferred alloy contains about 80.8 wt % Zr, about 14.2 wt % Co, and about 5 wt % A. These alloys are advantageous because they are suitable for general use, i.e., they have a relatively low activation temperature, are capable of sorbing a wide variety of gases, and minimize the environmental and safety risks associated with known nonevaporable getter alloys.
摘要:
A mercury-dispensing device is disclosed that includes a mercury dispenser having the formula Ti.sub.x Zr.sub.y Hg.sub.z in which x and y are between 0 and 13, inclusive, the quantity x+y is between 3 and 13, inclusive, and z is 1 or 2; and a promoter that comprises copper, silicon and possibly a third metal selected among the transition elements. A getter material selected among titanium, zirconium, tantalum, niobium, vanadium and mixtures thereof, and alloys of these metals with nickel, iron or aluminum can be included in the device. The mercury dispenser, promoter and optional getter material are provided preferably in the form of powders compressed as a pellet, or contained in a ring-shaped metallic support or rolled on the surfaces of a metallic strip. Also disclosed is a process for introducing mercury into electron tubes by making use of the above-mentioned mercury-dispensing devices.
摘要:
A mercury-dispensing combination suitable to release an amount of mercury higher than 60% during the activation step, even after partial oxidation, includes a mercury-dispensing intermetallic compound A with Hg and a second metal selected among Ti, Zr and mixtures thereof, as well as a promoting alloy or intermetallic compound B including Cu and a second metal selected among Sn, In or Ag or combinations thereof. There is also disclosed a mercury-dispensing device containing a combination of materials A and B, in addition to a process for introducing mercury into electron tubes consisting in the introduction of one of said devices inside the open tube and then heating thereof at a temperature between 550.degree. and 900.degree. C. after the tube sealing in order to get Hg free.
摘要:
The invention relates to an integrated getter device essentially consisting of at least one evaporable getter device and at least one non-evaporable getter device, wherein the different getter devices circumscribe areas at least partially superimposed or coincident, lying on essentially parallel or coincident planes and preferably arranged in a coaxial way.
摘要:
Improved process for evacuating the thermally insulating jacket of a dewar having an inner wall and an outer wall, with the inner space between said walls completely or partially filled with an insulating material, containing also a moisture sorbing material and a getter material, in which said moisture sorbing material is a chemical drying agent.
摘要:
The process of the present invention provides for the sorption of unwanted gas in a vessel by means of a non-evaporated barium getter. It comprises the steps of reducing an alloy of Ba.sub.1-x A.sub.x Li.sub.4-y B.sub.y to a particle size of less than 5 mm, under vacuum or an inert gas atmosphere and then placing the reduced alloy in the vessel. Upon exposing the reduced alloy to the residual gas in the vessel at a temperature of less than 150.degree. C., the gas is sorbed. The metal A is a metal chosen from the group consisting of elements of Group IIa of the periodic table of elements, excluding barium. The metal B is chosen from the group consisting of elements of Group IIIa of the periodic table of elements. Preferably 0.ltoreq.x.ltoreq.0.5 and 0.ltoreq.y.ltoreq.3.5.
摘要:
A protective vessel is provided for a getter material which comprises a first sheet of thermally stable material attached to an adhesive, which in turn is attached to a second sheet of thermo-retractable organic plastic material, the first and second sheets enclosing the getter material.
摘要:
The scope of the present invention is the provision of a non-evaporable gettering ternary alloy particularly for the sorption of water and water vapor in nuclear reactor fuel elements.The ternary gettering alloy has a composition which when plotted on a ternary composition diagram in weight percent Zr, weight percent Ti and weight percent Fe lies within a polygon having as its corners the points defined by(a) 75% Zr--5% Ti--20% Fe(b) 60% Zr--5% Ti--35% Fe(c) 45% Zr--20% Ti--35% Fe(d) 75% Zr--20% Ti--5% Fe