Class 148/673 - Tungsten(W) or tungsten base alloy

Subclass of Class 148 - Metal treatment
Definition: Process wherein the metal being treated is tungsten (W)
No. of patents: 24
Last issue date: 04/22/2008

Number	Title	Issue Date
7361239	High-density metallic-glass-alloys, their composite derivatives and methods for making the same The invention includes a method for producing high-density composites of metallic glass alloy powders in combination with a refractory metal powder, and includes related methods for producing metallic glass alloys. The invention, in one aspect, employs a system of m...	04/22/2008
6960319	Tungsten alloys for penetrator application and method of making the same Disclosed is a flow-softening tungsten alloy having the general formula: W100-pAiBjCkDe wherein W is tungsten; A is one or more elements selected from the ...	11/01/2005
6818073	Method of producing steel strip Steel strips and methods for producing steel strips are provided. In an illustrated embodiment, a method includes continuously casting molten low carbon steel into a strip of no more than 5 mm thickness having austenite grains that are coarse grains of 100-300 micro...	11/16/2004
6605165	Method of manufacturing discharge wire A discharge wire usable in an electrification device includes a tungsten wire subjected to mirror finish processing and an oxidized layer formed by heating the surface of the tungsten wire at a temperature in the range 400 to 600° C., wherein the film ha...	08/12/2003
6419758	Cathode wire filament for x-ray tube applications An x-ray cathode filament comprises a recrystallized coiled wire that comprises rhenium in a range from about 3 to about 7 weight percent with the balance being tungsten that is doped with potassium at a concentration in a range from about 30 to about 110...	07/16/2002
6136105	Process for imparting high strength, ductility, and toughness to tungsten heavy alloy (WHA) materials A method of imparting high strength, high ductility, and high fracture toughness to a refractory metal alloy workpiece includes: (i) subjecting the workpiece to at least one pass that reduces the initial cross-sectional area of said workpiece, (ii) anneal...	10/24/2000
5989494	Heat treatable tungsten alloys with improved ballistic performance and method of making the same A tungsten heavy alloy composition comprising tungsten, iron and elements selected from the groups X, Y and Z and having the formula W100-p Fei Xj Yk Zl. Such that "X" is one or more elements selected...	11/23/1999
5656106	Apparatus and method for net shape finishing of gears An apparatus is disclosed for performing thermomechanical processing of gears in which precise control of the thermal, metallurgical and mechanical action during the forming process is maintained. The apparatus comprises an induction heating system which ...	08/12/1997
5306364	High toughness tungsten based heavy alloy containing La and Ca. manufacturing thereof A tungsten based heavy alloy having a W--Ni--Fe based composition containing traces of lanthanum or calcium, thereby capable of exhibiting high toughness, irrespective of the content of impurities such as phosphorous and sulfur contained therein, the cool...	04/26/1994
5294269	Repeated sintering of tungsten based heavy alloys for improved impact toughness A method for heat-treatment of tungsten based alloys, capable of improving impact toughness while keeping tensile strength and elongation. The method comprises maintaining a sintered tungsten based alloy consisting of 86 to 99 weight % tungsten and the ba...	03/15/1994
5145530	Method of surface hardening titanium and other metals A method of hardening the surface of titanium and its alloys, and other structural metals which form hard carbides, by treating the surface thereof with a moving, discontinuous carbon arc. The metal surface to be hardened, and a carbon electrode are made oppos...	09/08/1992
5102474	Process for manufacturing semi-finished products from sintered refractory metal alloys In a process for manufacturing semi-finished products from sintered refractory metal alloys with a stacked microstructure, the sinter feed reshaped by at least 85% is subjected prior to recrystallization annealing to an intermediate annealing for at least...	04/07/1992
5051139	Process for the manufacture of semi-finished products or preformed parts made of refractory metals and resistant to thermal creep A process for the manufacture of dispersion-strengthened alloys of the refractory metals of the 4th, 5th and 6th subgroups of the Periodic Table for application in semi-finished products or preformed parts requiring high thermal creep-resistances, involve...	09/24/1991
4925741	Getter wire A getter wire is made by wrapping alternate layers of getter metal and refractory metal around an ingot of refractory metal. The composite ingot thus formed is reduced to wire, preferably by extrusion and drawing. The multi layers of refractory and getter...	05/15/1990
4923531	Deoxidation of titanium and similar metals using a deoxidant in a molten metal carrier Process for deoxidizing refractory metals such as titanium which contain less than about one percent oxygen. The process described includes heating a liquid metal deoxidant contained in a liquid metal carrier to treat the oxidized metal. After removing th...	05/08/1990
4923529	Equipment for continuous heat treatment of tungsten filaments wound on molybdenum cores The invention relates to continuous heat treatment of coiled tungsten filaments wound onto molybdenum cores, in the course of which said filament is passed first through a humid hydrogen atmosphere of about 1300° C. then through a dry hydrogen atmosphere...	05/08/1990
4863527	Process for producing doped tungsten wire with low strength and high ductility A process is disclosed for producing doped tungsten wire having a combination of relatively low strength and high ductility. The process involves swaging recrystallized rod to a diameter of from about 80 to about 125 mil, drawing this rod into wire having...	09/05/1989
4859239	Tungsten electrode and method of producing same An electrode, and method of producing same, including tungsten which has been heated in wet hydrogen at 1050° C. for 5 to 10 minutes, then heated at about 1500° C. for about three hours in a vacuum, and then further heated at about 2800° C. for about 5...	08/22/1989
4851057	Method of diffusion bonding and densifying material Refractory metals or ceramics are diffusion bonded or densified by assembling the workpieces to be bonded, wrapping the assembly with carbon yarn, heating the wrapped assembly, cooling the assembly and unwrapping. The expansion of the workpieces together ...	07/25/1989
4828814	Process for purification of solid material A process is disclosed for producing a solid material which, in some cases, may have a resultant purity of 99.999% or better which comprises contacting the solid material at a temperature approaching the melting point of the solid material with a purifyin...	05/09/1989
4768365	Process for producing tungsten heavy alloy sheet A process is disclosed for producing a tungsten heavy alloy sheet which involves rolling a starting slab consisting essentially of tungsten heavy alloy wherein the tungsten content is from greater than 75% to 93% by weight tungsten by passing the slab one...	09/06/1988
4362564	Method for producing microporous metal bodies Tungsten is vapor-deposited by hydrogen reduction of tungsten hexafluoride (WF6) to produce a tungsten body having from 40 to 100 ppm fluorine. The tungsten is then heated under vacuum to produce grain boundary porosity for a sufficient period ...	12/07/1982
4126493	Process for deoxidation of refractory metals Refractory metals, especially niobium and tantalum, are deoxidized by heating at 600° to 1300° C. under a protective gas in an alkali or alkaline earth halide salt melt containing at least 10% fluoride....	11/21/1978
3989549	Method of making incandescent lamp The coiled tungsten filament of an incandescent lamp is made more resistant to sagging by exposing the filament to a vaporized phosphorus atmosphere so as to form tungsten monophosphide on the filament. The filament is subsequently heated in order to diss...	11/02/1976

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Class 148/673 - Tungsten(W) or tungsten base alloy