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Class 148/712 - In gaseous state


Subclass of Class 148 - Metal treatment
Definition: Process wherein the specified agent is utilized to treat
No. of patents: 30
Last issue date: 04/22/2008


NumberTitleIssue Date
7361233Methods of hydrogen cleaning of metallic surfaces
The pulsed partial pressure hydrogen cleaning of cobalt-based alloys in turbine components is achieved by disposing the component within a vacuum furnace and heating the component. Upon heating to about 1400° F., a partial pressure hydrogen gas and a vacuum are rep...
04/22/2008
7147732Quenching method and apparatus
A hot object is quenched after heat treatment. A hot gas stream having at least 20% by volume of hydrogen is taken from for example a carburising chamber of a furnace. The gas is cooled by passage through a heat exchanger, and is compressed in a compressor. The comp...
12/12/2006
7108757Hydrogen storage alloys providing for the reversible storage of hydrogen at low temperatures
A reversible hydrogen storage alloy capable of storing large amounts of hydrogen and delivering reversibly large amounts of hydrogen at temperatures ranging from 0° C. up to 40° C. The hydrogen storage alloy is generally composed of titanium, vanadium, and chromiu...
09/19/2006
6910614Vacuum compression brazing furnace and method of using same
A vacuum heat treating furnace for brazing a large metallic part is disclosed. The vacuum furnace includes a pressure vessel having a cylindrical wall and a door dimensioned and positioned for closing an end of the cylindrical wall. A workpiece handling system is mo...
06/28/2005
6759134Process of forming a metallic article having a black oxide/ceramic surface and articles produced by the method
A process for forming a metallic article having a black ornamental surface includes the steps of metallurgically providing an alloy containing between about 51 and 70 about percent by weight of titanium, between about 3 and about 17 percent by weight of niobium, and...
07/06/2004
6692593Method for quenching metallic workpieces
A method for quenching metallic workpieces in a furnace space, includes subjecting a metallic workpiece to a heat treatment process in an evacuated furnace space. Before a quenching gas or mixture is passed into the furnace space, hydrogen is supplied to ...
02/17/2004
6554926Quenching heated metallic objects
A method for quenching a heated metallic object includes discharging a plurality of discrete gas streams from a plurality of nozzle outlets so that the gas streams impinge substantially uniformly over the outer surface of the object, the distance between ...
04/29/2003
6458217Superadiabatic combustion generation of reducing atmosphere for metal heat treatment
Systems useful for superadiabatic combustion generation of a reducing atmosphere for metal heat treatment include a superadiabatic reactor which supplies a reducing atmosphere to a metal heat treatment apparatus. In one aspect, the reactor includes a poro...
10/01/2002
6364966Method for manufacturing acoustic vibration plate
A method for manufacturing an acoustic vibration plate includes molding titanium metal into a shape of an acoustic vibration plate in order to obtain a titanium vibration plate, and performing a heat treatment on the titanium vibration plate by a ceramic-...
04/02/2002
6306225Process for producing wear-resistant boride layers on metallic material surfaces
A process is provided for producing wear-resistant boride layers on metal material surfaces. The process is characterized in that a boron halide selected from the group comprising boron trifluoride, boron tribromide, boron triiodide and their mixtures is ...
10/23/2001
6159307Method of annealing nonferrous metal parts without stickers
Process to avoid adhesions during the annealing of non-ferrous metal alloys, comprising the heating, holding and cooling phases, whereby the material being annealed is exposed to an inert or oxidizing protective-gas atmosphere during the structure transfo...
12/12/2000
6143098Process and plant for thermal treatment of metals in protecting atmosphere
A protective atmosphere for the heat-treatment of metals is obtained by heating a reactor containing a Nickel-based catalyst to a temperature of between 1000° C. and 1200° C., feeding to the reactor a flow of nitrogen having an oxygen content of between...
11/07/2000
6129789Surface treatment method of hydrogen absorbing alloy
Steam is contacted with a hydrogen absorbing alloy in a temperature range from 200° C. to 400° C. With a contact catalytic reaction of water, a metal contained in the hydrogen absorbing alloy is changed to an oxide or a hydroxide. Hydrogen produced caus...
10/10/2000
6036793Method of heat treating oxygen-sensitive products
The present invention provides a method of heat-treating an oxygen-sensitive workpiece to minimize any oxidation of the workpiece, as well as an improved door seal specially suited for use with oxygen-sensitive products. In the method, an oven has an oven...
03/14/2000
5898994Method for repairing a nickel base superalloy article
A method for repairing an environmental protective coated article portion of a gas turbine engine article made of a Ni base superalloy including Cr and at least about 6 wt. % total of Al and Ti comprises removing the coating, exposing the article portion ...
05/04/1999
5885379Tempered powdered metallurgical construct and method
A method of tempering powdered metallurgical constructs, that includes first deoxygenating and dehydrating powdered metal compacts before tempering. During the process, the sintered compacts are first preheated to a temperature that desorbs water vapor an...
03/23/1999
5882445Method of making semi-finished metal products
A method for producing metallic semifinished products such as strip or wire rom metallic work materials which have a high melting point and are difficult to shape, comprising the steps of a) first, alloying at least one element for lowering the melting poi...
03/16/1999
5868878Heat treatment by plasma electron heating and solid/gas jet cooling
A workpiece is heated by first forming an ionized gas plasma around the workpiece. A positive potential is applied to the workpiece to accelerate electrons from the plasma into the workpiece. The workpiece is uniformly surface heated by the energy directe...
02/09/1999
5346563Method for removing sulfur from superalloy articles to improve their oxidation resistance
Superalloy articles are made more oxidation resistant by a process which includes heat treating the article in the presence of foreign chemical species, at a temperature at which the foreign chemical species reacts with and modifies any oxide film present...
09/13/1994
4989840Controlling high humidity atmospheres in furnace main body
The humidity of the atmosphere of a heat-treating furnace is controlled by the use of superheated steam, which is generated by the use of a furnace-heated humidifier to which water is fed through a capillary tube. A secondary gas flow passes through the h...
02/05/1991
4966632Process for the annealing treatment of metal strips
An annealing treatment in a continuous furnace in which a flow of dense inert gas is injected in a rising duct and a descending duct, these flows being regulated by the analysis of hydrogen detected by a pressure controller acting on valves to achieve a m...
10/30/1990
4867808Heat treating a metallic workpiece by quenching under cooling gas under above atmospheric pressure and specified circulation rate
A process for heat treatment of metallic workpieces by heating in a vacuum furnace followed by quenching in a coolant gas under above-atmospheric pressure and with coolant-gas circulation....
09/19/1989
4612064Method for heat-treating a charge using a vacuum furnace
A method and vacuum furnace for heat-treating a charge. Pursuant to the method, after the charge is placed in the receiving vessel, the latter is evacuated and flooded with inert gas. Subsequently, the charge is heated to the maximum permissible operating...
09/16/1986
4576659Process for inhibiting metal migration during heat cycling of multilayer thin metal film structures
The formation of metal oxide contaminants on the surfaces of thin metal films by out-diffusion primarily through the grain boundaries thereof of metal from an underlayer is inhibited by conducting heat cycling of such layered metal structures in an ambien...
03/18/1986
4536227Method of and apparatus for producing a controlled unsaturated vapor pressure of a volatile liquid in a heat treatment chamber
It is necessary in many heat treatment processes conducted in open systems to maintain a given partial pressure of a volatile component of a material being treated, and it is desirable to conserve this volatile component, both on account of cost and in th...
08/20/1985
4515645Procedure for bright annealing of metallic work pieces using nitrogen as protective gas
Metallic work pieces are annealed under protective gas in bright annealing furnaces with subsequent cooling line. Exogas or nitrogen is used as protective gas. In the latter case, liquid nitrogen is evaporated and introduced at several locations in the br...
05/07/1985
4446121Material for hydrogen absorption and desorption
An economical metallic material for absorption and desorption of hydrogen comprising an alloy having the general formula represented by ABx, wherein A is Ca or a metallic material which is an alloy including Ca, B is Ni or a metallic material w...
05/01/1984
4398971Method of heating, holding or heat treatment of metal material
In an indirectly heated, gas-fired furnace (10) for the heat treatment of metal material in an atmosphere of processing gas consisting predominantly of nitrogen, the processing gas is produced using the heating exhaust gases as the principal raw material....
08/16/1983
4249963Method for improving a property of an alloy
A property, such as ductility, mechanical strength and increased remelt temperature, of an alloy, for example one which includes an element such as Si or B, or both, is improved by depletion of such an element through the alloy surface. This is accomplish...
02/10/1981
4069071Method for generating a reducing atmosphere for heat-treating installations
An atmosphere of nitrogen containing hydrogen is generated by cracking amia and recycling a previously generated atmosphere that already had been used. The atmosphere generated by cracking, and the recovered atmosphere that previously had been used, are ...
01/17/1978
 
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