General Electric Company

John L Walter

Ami E Berkowitz

Fred E Luborsky

Robert Adolph Ackermann

William Paul Minnear

David William Skelly

William R Reed, Jr

James A Graves

John E McMillan

John W Pugh

Francis W Pikus

Materials for cryogenic refrigerator regenerators are formed by a high yield spark erosion cell. The materials are made of erbium or dysprosium and are spherical shaped. The spheres have a diameter range of 150 .mu.m to 400 .mu.m with a packing factor of at least 50%. The materials are made by disposing chunks of a starting material into a liquid dielectric in a spark chamber, agitating the chunks, impressing a spark voltage in order to cause melting of the chunks and formation of spherical particles, and collecting the particles at the bottom of the spark chamber. The particles may then be gathered, dried, and separated.

Fabrication of cryogenic refrigerator regenerator materials by spark

Wear resistant cutting tools are comprised of cutting tools implanted with at least one element selected from the group consisting of, chlorine, fluorine, bromine, iodine, sulfur, indium, gallium and tin. The elements are implanted within the cutting tools in at least an effective amount to increase the wear resistance of the insert, up to an amount that does not substantially impair the hot hardness and toughness of the tool. In a method for lubricating the interface between a cutting tool and a workpiece in a lathe turning operation, at least one element selected from the group consisting of fluorine, bromine, iodine, sulfur, indium, gallium and tin are implanted in the tool. The elements are implanted so that the elements can lubricate the interface between the cutting edge and workpiece during turning without substantially impairing the hot hardness and toughness of the cutting tool. A workpiece is then shaped with the tool by metal removal, within a range of cutting speeds that cause the implanted element or elements to lubricate the interface.

Wear resistant cutting tools and shaping method

Apparatus is provided for the production of ultrafine powder. The powder is produced by spark erosion within an electric discharge cell. The starting material for production of the powder is a body in chunk form of the material to be pulverized. The material is contained in an electric discharge cell having a fine mesh screen bottom. The cell and its contents are immersed in a dielectric fluid such as water, liquified gas or an organic base liquid. The cell and its contents are vibrated to cause the chunks to separate repeatedly and momentarily. A sparking voltage is impressed repeatedly through the body to develop sparks between confronting portions of separated chunk surfaces. Small particles produced as a result of the sparking fall through the screen of the cell and are collected as product.

Method for fabrication of low cost finely divided silicon-germanium and

A ferrofluid comprised of composite particles comprised of polymer-enmeshed magnetic metallic particles in indefinite suspension in a carrier fluid is produced by providing a pair of electrodes formed of a composition which will produce the desired magnetic metallic particles, immersing the electrodes in an organic dielectric liquid, applying a pulsed electric potential between the electrodes, adjusting the gap therebetween until there is an electric discharge eroding an electrode producing magnetic metallic particles enmeshed in polymer, recovering the magnetic material from the dielectric liquid and dispersing the magnetic material in a carrier fluid producing ferrofluid.

Process for producing a ferrofluid

An improved inlead construction for an electric lamp is disclosed which utilizes an iron alloy containing sufficient silicon to avoid transformation of the inlead from the alpha ferrite phase to the gamma austenite phase at lamp operation temperatures. This precludes debilitating deformation of the inlead wires caused by on-off cycling of the lamp and concomitant cycling of the wire through the alpha to gamma transformation range. Such deformation can lead to structural or operational failure if the inleads become disconnected or electrically shorted from the resistive filament during lamp operation. In a preferred lamp construction, a pair of the improved inlead wires serve as the sole means of physical support for a resistive incandescent filament directly connected thereto and said inlead wires can further be coated with a dissimilar metal for higher lamp loading requirements in order to help avoid iron migration which can produce deterioration of the resistive incandescent filament.

Inlead construction for electric lamp

A ferrofluid comprised of composite particles comprised of polymer-enmeshed magnetic metallic particles in indefinite suspension in a carrier fluid is produced by providing a pair of electrodes formed of a composition which will produce the desired magnetic metallic particles, immersing the electrodes in an organic dielectric liquid, applying a pulsed electric potential between the electrodes adjusting the gap therebetween until there is an electric discharge eroding an electrode producing magnetic metallic particles enmeshed in polymer, recovering the magnetic material from the dielectric liquid and dispersing the magnetic material in a carrier fluid producing ferrofluid.

Ferrofluid

Amorphous metal alloys having good magnetic and physical properties including elevated temperature stability, ductility and saturation flux density contain iron, boron and silicon in proportions of 80-84, 12-15 and 1-8 atom percent respectively.

Amorphous metal alloys and ribbons thereof

Iron-boron-silicon ternary amorphous alloys having high saturation magnetization, high crystallization temperature and low coercivity are provided.

Iron-boron-silicon ternary amorphous alloys

A directionally solidified casting comprising improved high temperature properties is provided having a cobalt-base matrix and consisting essentially of, on a weight basis, 10-20% nickel, 8.1-25% tungsten, 0-10% chromium, 10-23% tantalum, 0.1-1.5% carbon, the balance being cobalt. Embedded in the matrix is an aligned tantalum carbide reinforcing fibrous phase.

Directionally solidified cobalt-base eutectic alloys

A directionally solidified casting having improved high temperature properties is provided having a nickel-base matrix and comprising in weight percent of at least 2% rhenium and at least 6% tungsten, but less than 4% aluminum and less than 7% chromium. Embedded in the matrix is an aligned tantalum carbide reinforcing fibrous phase.

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Scotia, NY, United States of America

John L Walter