Abstract: A powdered metal spray coating material comprises two or more of Ni, Cr and Co, and 0.1 to 1.0% by weight of Y based on the total weight of the spray coating material. If Co is present in this spray coating material, the content of Co is in a range of 20 to 40% by weight, and the balance is Ni and/or Cr. If Cr is present, the content of Cr is in a range of 15 to 30% by weight, and the balance is Ni and/or Co. Such powdered metal spray coating material is produced by melting and homogenizing starting metal in vacuum and forming them into a metal powder by a gas atomizer.
Abstract: A method of producing nitrogenated metal alloys which involves melting a al alloy under a nitrogen atmosphere and subsequently gas atomizing the molten alloy with nitrogen gas has been found to produce alloys powders having a high nitrogen content and a minimum amount of hollow particles. The resulting alloy powders which demonstrate superior mechanical properties and heat and chemical resistance are easily fabricated into articles utilizing powder metallurgical processes.
Type:
Grant
Filed:
October 4, 1990
Date of Patent:
May 19, 1992
Assignee:
The United States of America as represented by the Secretary of Commerce
Inventors:
Francis S. Biancaniello, Gregg N. Janowski, Stephen D. Ridder
Abstract: In an advantageous process for producing powdered aluminium alloys which have a catalytic action or are capable of acting as precursors of catalysts, good results are obtained if the alloy is atomized with water and/or a gas at a temperature of 50.degree. to 500.degree. C. above its melting point and then cooled and dried.
Type:
Grant
Filed:
January 11, 1991
Date of Patent:
February 25, 1992
Assignees:
Bayer Aktiengesellschaft, Hermann C. Starck Berlin GmbH & Co. KG
Inventors:
Udo Birkenstock, Jurgen Scharschmidt, Peter Kunert, Helmut Meinhardt, HaPaul, Paul Meier
Abstract: Titanium is induction melted to produce a molten mass thereof and a water-cooled crucible having a nonoxidizing atmosphere and a bottom opening. The current to the coil used for induction melting is adjusted to produce a levitation effect on the molten mass in the crucible to prevent the molten mass from flowing out of the bottom opening. The molten mass is also maintained out-of-contact with the crucible by providing a solidified layer of titanium between the molten mass and the crucible. After production of the molten mass of titanium, the current to the induction coil is reduced to reduce the levitation effect and allow the molten mass to flow out of the bottom opening of the crucible as a free-falling stream of molten titanium. This stream is struck with an inert gas jet to atomize molten titanium to form spherical particles. Spherical particles are cooled to solidify them and are then collected.
Abstract: Fine metal alloy powders coated with a protective film are disclosed which re produced by the gas atomization process. The protective films are formed during the gas atomization process by gas atomizing a molten mixture of a metal alloy containing an alloy addition agent in an atomizing gas which will selectively react with the alloy addition agent to form a thin protective film on the surface of the metal powder.
Type:
Grant
Filed:
June 28, 1990
Date of Patent:
December 17, 1991
Assignee:
The United States of America as represented by the Secretary of the Navy
Abstract: A method is described for forming hollow particles, or shells, of extremely small size. The shell material is heated to a molten temperature in the presence of a gas that is at least moderately soluble in the shell material, to form a solution of the molten shell material and the soluble gas. The solution is atomized to form a multiplicity of separate droplets that are cooled while in free fall. Cooling of a droplet from the outside traps the dissolved gas and forces it to form a gas bubble at the center of the droplet which now forms a gas-filled shell. The shell is reheated and then cooled in free fall, in an environment having a lower pressure than the gas pressure in the shell. This causes expansion of the shell, to form a shell having a small wall thickness compared to its diameter.
Type:
Grant
Filed:
April 30, 1986
Date of Patent:
October 8, 1991
Assignee:
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
Inventors:
Mark C. Lee, Christopher H. Schilling, Taylor G. Wang
Abstract: A process is described for the preparation of an aluminium-strontium master alloy suitable for use as structure refiner during the solidification of molten aluminium-silicon alloys, comprising atomizing a molten alloy containing 3 to 30% by weight of strontium, the balance being aluminium, quick cooling of the atomized droplets to obtain solid particles and consolidation of the obtained solid particles.
Type:
Grant
Filed:
May 21, 1990
Date of Patent:
September 3, 1991
Assignee:
Shell Research Limited
Inventors:
Mattheus Vader, Jan Noordegraaf, Edward H. Klein Nagelvoort, Jan P. Mulder
Abstract: Soluble gas is introduced in a melt material which is then atomized and rapidly cooled. The cooling drives the gas from solution, further disintegrating the atomized material to an ultra-fine powder. In one embodiment the atomization and rapid cooling are effected using a gas atomization die. Introduction of the soluble gas may be effected by addition of reactive constituents to the melt, for reactively forming such gas. Finer powders with desirable metallurgical properties are formed using a metallic melt.
Type:
Grant
Filed:
October 26, 1988
Date of Patent:
June 18, 1991
Assignee:
UltraFine Powder Technology, Inc.
Inventors:
Charles P. Ashdown, James G. Bewley, George B. Kenney
Abstract: Nitrogen-strengthened alloys, especially steels, are produced by heating a combination of metal particles and a nitrogen donor, such as a chromium nitride, to make nitrogen available as a solute in the particles. The particles may be produced as a permeable preform for the process. The dissolved nitrogen leads to improved hardness, and higher strength is additionally obtained by the inclusion of a dispersant, such as yttria, in the particles.
Abstract: A system and method for atomizing a titanium-based material to particulates in a controlled atmosphere. The system includes a crucible for skull melting a titanium-based material. The molten titanium-based material is transferred to a tundish for receiving the molten titanium-based material. The tundish has a bottom portion with an aperture formed therein and is heated. A molten metal nozzle for forming the molten titanium-based material into a free-falling stream exiting from the tundish is provided, the molten metal nozzle being coaxially aligned with the aperture of the tundish. A baffle may be disposed in the tundish for stabilizing the free-falling stream of the molten titanium-based material. The molten titanium-based material is atomized by impinging the free-falling stream of the molten titanium-based material with an inert gas jet issuing from a gas nozzle.
Type:
Grant
Filed:
September 27, 1989
Date of Patent:
March 12, 1991
Assignee:
Crucible Materials Corporation
Inventors:
Charles F. Yolton, Thomas Lizzi, John H. Moll
Abstract: Producing finely divided U.sub.3 Si by supercooling a melt of uranium and silicon at a high cooling rate of 10.sup.3 to 10.sup.7 .degree. C./sec.
Type:
Grant
Filed:
November 14, 1989
Date of Patent:
March 5, 1991
Assignee:
Korea Advanced Energy Research Institute
Abstract: A method for producing permanent magnet alloy particles suitable for use in producing bonded permanent magnets. A melt or molten mass of a permanent magnet alloy having at least one rare earth element, at least one transition element, preferably iron, and boron is produced. The melt is inert gas atomized to form spherical particles within the size range of 1 to 1000 microns. The particles are heat treated in a nonoxidizing atmosphere for a time at temperature to significantly increase the intrinsic coercivity of the particles without sintering the particles to substantially full density. Thereafter, the particles are separated to produce a discrete particle mass. The particles during heat treatment may be maintained in motion to prevent sintering thereof.
Type:
Grant
Filed:
May 5, 1989
Date of Patent:
February 19, 1991
Assignee:
Crucible Materials Corporation
Inventors:
Carol J. Willman, Edward J. Dulis, Francis S. Snyder
Abstract: A method for producing power by atomizing a stream of molten material by contact with a swirling annular gas stream having an angular to axial velocity ratio sufficient to cause some of the gas to flow in the axially opposite direction from that of the gas stream.
Abstract: The present application relates to a method for production of trichloromonosilane in a fluidized bed reactor by reaction of silicon powder and HCl at a temperature between 280.degree. and 300.degree. C. wherein silicon powder which has been produced by gas atomization of molten silicon is used. The gas atomized silicon powder has a preferred particle size between 1 and 1000 .mu.m.
Type:
Grant
Filed:
November 9, 1989
Date of Patent:
January 22, 1991
Assignee:
Elkem a/s
Inventors:
Karl Forwald, Gunnar Schussler, Oyvind Sorli
Abstract: A method and a device for manufacturing a powder of amorphous ceramic or metallic particles in a high pressure autoclave. The substance in the liquid state is pressed out of a nozzle (7) upwards in vertical direction. An acoustic levitation field acts on the area in front of the nozzle orifice (12) and an inert cooling gas is made to flow turbulently in this area so that the droplets sprayed out of the nozzle are rapidly cooled and get solidified to grains. The powder can be directly machined by pressing and sintering into objects of the desired shape.
Abstract: Method and apparatus for producing superfine powder in spherical form with a diameter of about 5 to 30 microns in a Laval nozzle system. The material to be powdered is melted in a crucible, and is then superheated after it emerges from the crucible.
Abstract: Apparatus and a method for producing submicron and smaller metal alloy pacles using a main chamber having a longitudinal axis and a feeder for introducing a quantity of molten alloy under pulsed gas pressure in a direction generally radial to the axis. The feeder has a gas stream for forming metal droplets from said alloy. A gas accelerator directs axially flowing gas against the droplets from the feeder in the chamber. The accelerator directs the droplets in an axial direction to a substrate located along the axis and in the direction of flow from the accelerator to receive the droplets at a predetermined distance from the feeder, whereby the particles are produced.
Type:
Grant
Filed:
February 7, 1992
Date of Patent:
August 4, 1992
Assignee:
The United States of America as represented by the Secretary of the Army