Carpenter Technology Corporation

David Esposito

Gregory J Del Corso

Robert E Carnes

David L Strobel

Raymond A Reiter

Edward F Holland

William J Burns, Ii

David T Marlowe

A method of manufacturing a flat form from blended metallic powder including a major constituent by weight having a high melting point and a minor constituent by weiht having a substantially lower melting point includes selection of the powder to provide continuous and reproducible compacted flat forms. Powder is selected on the basis of compressibility and flowability. The selected powder is compacted to a flat green form and then liquid phase sintered. The flat form may be stacked to provide a flat article of a desired thickness which will result in a monolithic or composite cross section when subsequently sintered. Liquid phase sintering is carried out in a manner designed to avoid undesirable embrittlement and to provide a uniform microstructure in the fully consolidated article. The process is especially useful in the production of tungsten heavy alloy plate.

Method of manufacturing flat forms from metal powder and product formed

A powder metallurgy consolidation process and apparatus for carrying out said process produces integral metal bodies by heating metal powder of a predetermined composition to a temperature sufficient to cause solid state interparticle bonding, while simultaneously maintaining a reactive fluid in contact with the metal powder. The metal powder is compacted to a density greater than 90% of the full theoretical density of the composition after the reactive fluid has been removed. The reactive fluid is selected to modify the powder particle surface chemistry in order to improve bondability and to obtain other properties as desired. Metal bodies which have been consolidated by the process are sufficiently dense to be mechanically hot worked and exhibit exceptionally low retained gas content.

Process and apparatus to simultaneously consolidate and reduce metal

A nozzle assembly for atomizing a stream of molten metal includes a refractory metal-transmitting nozzle having a short metering orifice at its entrance end and a relatively long divergent discharge passage terminating at a flat annular land formed at the bottom end of the metal-transmitting nozzle. The metal-transmitting nozzle is seated in an opening in the bottom of a tundish or other source of molten metal with its upper end containing its metering orifice projecting into the molten metal reservoir. The lower-end portion projects from the bottom of the tundish and through the central portion of an atomizing fluid nozzle assembly in which it seats. The central portion of the atomizing fluid nozzle assembly projects below the bottom member of the atomizing fluid nozzle assembly and forms an atomizing fluid orifice therewith. The process of utilizing the apparatus for atomizing powder is described in which a molten metal film is formed around the outer bottom portion of the metal-transmitting nozzle which extends below the central portion and orifice of the atomizing fluid nozzle assembly.

Atomizing nozzle assembly for making metal powder and method of

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Reading, PA, United States of America

David Esposito