Air Products and Chemicals, Inc.

Other

Combustion Tec

Combustion Tech, Inc

Zurecki, Zbigniew

Zbigniew Zurecki

Robert B Swan

Ranajit Ghosh

John Lewis Green

John Herbert Frey

Edward A Hayduk, Jr

Robert Bruce Swan

John J Kaiser

Robert Ellsworth Knorr, Jr

John G North

David L Mitchell, Jr

Guido Plicht

Robert Ellsworth Knorr

Mahendra L Joshi

Aleksandar Georgi Slavejkov

Xiaolan Wang

Kerry R Berger

John Peter Hobbs

James K Nabors

James Francis Heffron

Xiaoguang Zhang

George Matthew Harriott

Lance Michael Grimm

James Bryan Taylor

William T Zaboy

Edward Andrew Hayduk

Kerry Renard Berger

Xiaoyi He

Lisa Ann Mercando

Michael David Buzinski

Andrew Joseph Woytek

Jean-Philippe Trembley

Daniel James Gibson

Anna K Wehr-Aukland

Christopher Alan Ward

Kevin John Giardiniere

Robert C Best

Michael Dennis Lanyi

Kerry B Berger

David J Lach

Bruce Edward Snyder

Philip Burton Jewell, Jr

Harald Schillak

David Scott Nelson

Maximus Akuh

Mahendra Ladharam Joshi

John Joseph Kaiser

John Gregory North

James Keith Nabors

Robert James Edwards

Detlef Bennewitz

Chistopher Alan Ward

Ellsworth Knorr

Werner Dieter Langkabel

Methods and systems for controlling gas atmospheres in three-dimensional laser printing and weld overlay consolidation operations using metallic powders are provided. In one or more embodiments, such systems and methods comprise a printing chamber or laser weld overlay system, a gas supply system, a feed powder system, and one or more sensors employed to control the printing or welding operation. The methods and systems of the invention employ one or more inert gases having a purity greater than or equal to 99.995%

Gas atmosphere control in laser printing using metallic powders

Described herein are a method, an apparatus, and a system for metal processing that improves one or more properties of a sintered metal part by controlling the process conditions of the cooling zone of a continuous furnace using one or more cryogenic fluids. In one aspect, there is provided a method comprising: providing a furnace wherein the metal part is passed therethough on a conveyor belt and comprises a hot zone and a cooling zone wherein the cooling zone has a first temperature; and introducing a cryogenic fluid into the cooling zone where the cryogenic fluid reduces the temperature of the cooling zone to a second temperature, wherein at least a portion of the cryogenic fluid provides a vapor within the cooling zone and cools the metal parts passing therethrough at an accelerated cooling rate.

Method of metal processing using cryogenic cooling

A nozzle and process are set forth for contacting a cryogenic liquid and a gas, and discharging the resulting fluid through the nozzle. In one embodiment, the ratio of the discharged fluid's liquid component to its gaseous component is controlled as a function of the gas pressure.

Apparatus and method for regulating cryogenic spraying

Described herein is a method that can be used for heat treating a metal in at least one of the following processes: carburizing, carbonitriding, nitrocarburizing, and neutral carbon potential annealing operations that are used in a 1 atmosphere pressure furnace and in an atmosphere that is oxygen free and comprises nitrogen and at least one hydrocarbon.

Method and apparatus for heat treating a metal

A fluid spray device system () that maintains a resultant fluid discharge, or a material onto which the resultant fluid is discharged, within a predetermined range of a set-point temperature by regulating the flow rate of a throttling gas using a proportional valve (). The resultant fluid has throttling gas and cryogenic fluid components. Both the throttling gas and cryogenic fluid are preferably supplied from a single tank () and the cryogenic fluid supply is pressure-regulated and includes a triaxial delivery hose () having a return line with a back-pressure regulator ().

Apparatus and method for controlling the temperature of a cryogen

A method and apparatus for nitriding of highly-alloyed metal article is disclosed herein. In one embodiment, the method and apparatus uses at least one nitrogen source gas such as nitrogen and/or ammonia in an oxygen-free nitriding gas atmosphere, with small additions of one or more hydrocarbons. In this or other embodiments, the method and apparatus described herein is applicable to metal articles comprising iron, nickel and cobalt based alloys and which tend to form passive oxide films on at least a portion of their surface, heated to and nitrided at a certain temperature without prior surface preparation. The apparatus includes an external gas injector comprising 50-60 Hz AC, high voltage/low-current arc discharge electrodes, activating the nitriding atmosphere stream on its way from source to nitriding furnace.

Method and apparatus for nitriding metal articles

A method of quenching a material by injecting a cryogenic fluid into a cooling stream and simultaneously venting gas from the cooling stream, in order to maintain a desired target pressure in a chamber containing the material. In a examplary application of the method, the quenching is a step in the heat-treatment of a metal and the chamber is part of a vacuum furnace. Also disclosed is a method of supplying a cryogenic fluid to a process in which the amount of cryogenic fluid necessary to perform the process is transferred from a storage vessel to a supply vessel via a supply line, after which the supply line is closed. An elevated pressure is maintained by vaporization of a relatively small amount of the cryogenic fluid that is allowed to build in a pressure vessel that is in fluid communication with the supply vessel.

Method and apparatus for quenching of materials in vacuum furnace

A process for the thermal deposition coating of a workpiece is provided that comprises the steps of:

Thermal deposition coating method

A process for treating a workpiece having the steps of: altering the temperature of a workpiece surface wherein at least one condition selected from the group of: thermal treatment rate, relative motion between the surface and said thermal treatment rate, coolant flow rate onto said surface, heating flow rate onto said surface and the relative speed between the heating means or the cooling means and the surface is controllable; simultaneously measuring temperatures at a plurality of locations over the surface of the workpiece; determining an average temperature of the temperatures measured; comparing the average temperature to preselected minimum and maximum temperatures for the workpiece; and automatically adjusting at least one of, the controllable conditions if said average temperature is not between the preselected minimum and maximum temperatures for the workpiece. A system for performing a thermal treatment process and the resulting product are also provided.

Treatment method, system and product

A gas injector including in which a gas is passed through high-voltage/low-current electrical discharges before being discharged into the chamber of a thermal treatment furnace. The electrical activation of the gas accelerates desirable reactions between the gas, gases in the furnace chamber, and the chamber workload. Preferably, a hot electrode is electrically charged and the other parts of the gas injector and the furnace are grounded. Also provided is a method for activating an atmosphere within the reaction chamber of a controlled-atmosphere reactor.

Furnace atmosphere activation method and apparatus

An apparatus and a method are disclosed for reducing a thickness of a thermomechanically-affected layer on an as-machined surface of a hard metal workpiece being machined by a hard cutting tool exerting a thermomechanical load on a surface of the workpiece. The method involves reducing the thermomechanical load on the surface of the workpiece, and the apparatus includes a means for reducing the thermomechanical load on the surface of the workpiece.

Apparatus and method for machining of hard metals with reduced detrimental white layer effect

A cryogenic fluid jet is used in an apparatus and a method for remote cooling of a cutting tool engaged in machining a workpiece under high-energy conditions, such as high-speed machining, hard-turning, cutting of difficult to machine materials, and combinations thereof. The apparatus and method use a stabilized, free-expanding cryogenic fluid jet having a pulse cycle time less than or equal to about 10 seconds. The apparatus and method increase the cleanliness of machined parts and chips and machining productivity of hard but brittle tools, including but not limited to tools which should not be cooled with conventional cooling fluids.

Apparatus and method of cryogenic cooling for high-energy cutting operations

This invention is a method and apparatus for cutting a workpiece which may have interruptions, with a cutting insert having a cutting edge, where the cutting insert is held in a tool holder and is optionally supported by a shim. Coolant, which may contain liquid nitrogen, is introduced through a passageway to a cooling passage located near the cutting edge. The cooling passage may be located either under, behind, or under and behind the cutting edge. Coolant impacts the wall surfaces of the cooling passage near the cutting edge where it is partly evaporated thereby cooling the cutting insert.

Method and apparatus for machining workpieces having interruptions

A method and apparatus for improving the surface finish and/or surface integrity of a workpiece formed or shaped with a tool increase the surface hardness of the workpiece during forming or shaping of the workpiece. A method and apparatus for forming or shaping a workpiece also increase the surface hardness of the workpiece during forming or shaping of the workpiece with a tool, as do a method and apparatus for manufacturing a finished part or product from a workpiece. In some embodiments, an expanding jet of cryogen may be jetted to a surface of a workpiece and a tool from a nozzle, wherein the cryogen is at least partially separated into a condensed phase portion and a vapor portion within a downstream portion of the nozzle.

Apparatus and method for improving work surface during forming and shaping of materials

Method of forming a workpiece comprising (a) providing a tool and a workpiece, wherein the workpiece has an initial shape; (b) placing the workpiece and the tool in contact, applying force to the tool and/or the workpiece, and moving the tool and/or the workpiece to effect a change in the initial shape of the workpiece by forming; and (c) providing a jet of cryogenic fluid and impinging essentially all of the jet of cryogenic fluid on a surface of the tool.

Cryofluid assisted forming method

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Macungie, PA, United States of America

Zbigniew Zurecki