Alliedsignal Inc.

Allied Corporation

Demodulation, Inc.

Honeywell International Inc.

Metglas, Inc.

Howard Horst Liebermann

William C LaCourse

James E O'Keefe, Jr

Nicholas J DeCristofaro

Ryusuke Hasegawa

Gordon Edward Fish

Debasis Bose

John R Bedell

Ronald Joseph Martis

John Silgailis

Lance A Davis

Shinya Myojin

Alexis G Clare

John A Wellslager

Wesley A King

David W Palm

David F Teller

Phillip L Roberts

V Rv Ramanan

Stephen D Albert

Derek Raybould

V R Ramanan

Robert W Smith

James Riesenfeld

Tedd P Hardman

Alan H Goldstein

Chin Fong Chang

Claude D Tahlmore

A metallic glass-coated microwire has controllable surface porosity. The porosity is achieved by etching the metallic glass-coated microwire or other shapes of glass-coated bodies with acid after annealing to produce a multi-phase glass coating. Porous metallic glass-coated microwires are found to make superior PCR machines, which find use in a variety of in vivo, biochemical, and chemical sensors. Advantageously, the PCR apparatus is smaller, less expensive to construct than conventional units. It readily carries out in vivo passive or active operations.

Polymerase chain reaction using metallic glass-coated microwire

A metallic glass-coated wire is formed by drawing a hollow glass fiber from a container in which molten alloy is entrained and solidified. Interference stresses extant between the glass coating and the alloy core of the wire are produced by systematically controlling thickness and mechanical elastic properties of the glass. The interference stress is tailored by selection of glass thickness and chemistry to optimize wire drawing process conditions, such as drawing temperature and strain rate. In addition, the interference stress is especially tailored to assure physical integrity of the glass-alloy composite wire product. Local property variations along the wire length are minimized, facilitating production of discrete wire segments especially suited for use in EAS applications.

Engineered glasses for metallic glass-coated wire

A glass-coated amorphous metallic microwire is encoded with multi-bit digital information. Encoding is achieved magnetically, optically or through a combination of magnetic and optical encoding processes. Magnetic encoding is carried out by modifying the constituent magnetic domain structure through selective relief of interfacial stress between the glass coating and the amorphous metallic alloy core. It is also achieved by selective surface crystallization of the amorphous metallic core in order to produce a controlled magnetic bias field. Optical encoding is associated with the glass coating. It is readily achieved by fluorescent element deposition, patterned removal of fluorescent element coating, Bragg grating, and thermally activated pattern deposition. The magnetic and optical multi-bit encoding approaches for glass-coated amorphous metallic microwire can be used individually or collectively in either a redundant or a complementary manner. Encoded microwire of the instant invention can be assembled into tags for electronic article surveillance and into numerous other structures as well.

Multi-bit encoded glass-coated microwire and articles composed thereof

A drawn glass-coated metallic member has a thermal contraction coefficient differential such that the thermal contraction coefficient of the glass is less than that of the metallic member. The thermal contraction coefficient differential is maintained within a predetermined range during drawing. Drawn glass is placed under residual compression, interfacial bonding between said glass and said wire is substantially uniform, and surface cracking and bond breaks between metal and glass are substantially prevented. Optical properties of the glass coated microwire provide a basis for enabling multi-bit encoding capability. Advantageously data encoding is achieved optically, magneto-optically or using a combined magnetic and optical encoding mechanism. The duplex material constitution of the glass coated microwire permits imparting of data thereon by selection and processing of the glass. Data implantation is readily achieved in-line, during an initial drawing operation, or as a separate post-draw process. Reading of data on optically encoded glass coated microwire is readily accomplished by optical or magnetic methodology, or a combination thereof.

Optically encoded glass-coated microwire

An apparatus and method for casting metal strip includes a moving chill body that has a quench surface. A nozzle mechanism deposits a stream of molten metal on a quenching region of the quench surface to form the strip. The nozzle mechanism has an exit portion with a nozzle orifice. A depletion mechanism includes a plurality of independently controllable gas nozzles to supply a reducing gas to multiple zones of a depletion region located adjacent to and upstream from the quenching region. The gas flow profile can be controlled in each zone independently of controlling the gas flow in other zones. The reducing gas reacts exothermically to lower the density to provide a low density reducing atmosphere within the depletion and substantially prevent formation of gas pockets in the strip.

Apparatus and method for casting amorphous metal alloys in an adjustable low density atmosphere

A glassy metal alloy consists essentially of the formula Co Ni Fe M B Si C , where M is at least one element selected from the group consisting of Cr, Mo, Mn and Nb, &ldquo;a-g&rdquo; are in atom percent and the sum of &ldquo;a-g&rdquo; equals 100, &ldquo;a&rdquo; ranges from about 25 to about 60, &ldquo;b&rdquo; ranges from about 5 to about 45, &ldquo;c&rdquo; ranges from about 6 to about 12, &ldquo;d&rdquo; ranges from about 0 to about 3, &ldquo;e&rdquo; ranges from about 5 to 25, &ldquo;f&rdquo; ranges from about 0 to about 15 and &ldquo;g&rdquo; ranges from about 0 to 6, said alloy having a value of the saturation magnetostriction between &minus;3 ppm and &plus;3 ppm. The alloy can be cast by rapid solidification from the melt into ribbon, sheet or wire form. The alloy exhibits non-linear B&mdash;H hysteresis behavior in its as-cast condition. The alloy is further annealed with or without magnetic field at temperatures below said alloy's first crystallization temperature, having non-linear B&mdash;H hysteresis loops. The alloy is suited for use as a magnetic marker in electronic article surveillance systems utilizing magnetic harmonics.

Magnetic glassy alloys for electronic article surveillance

A glassy metal alloy consists essentially of the formula Co Ni Fe M B Si C where M is at least one element selected from the group consisting of Cr, Mo, Mn and Nb, &ldquo;a-g&rdquo; are in atom percent and the sum of &ldquo;a-g&rdquo; equals 100, &ldquo;a&rdquo; ranges from about 25 to about 60, &ldquo;b&rdquo; ranges from about 5 to about 45, &ldquo;c&rdquo; ranges from about 6 to about 12, &ldquo;d&rdquo; ranges from about 0 to about 3, &ldquo;e&rdquo; ranges from about 5 to 25, &ldquo;f&rdquo; ranges from about 0 to about 15 and &ldquo;g&rdquo; ranges from about 0 to 6, said alloy having a value of the saturation magnetostriction between &minus;3 ppm and &plus;3 ppm. The alloy can be cast by rapid solidification from the melt into ribbon, sheet or wire form. The alloy exhibits rounded or rectangular or sheared B-H hysteresis behaviors in its as-cast condition. The alloy is further annealed with or without magnetic field at temperatures below said alloy's first crystallization temperature, having rounded or rectangular or sheared or linear B-H hysteresis loops. The alloy is suited for magnetic applications especially at high frequencies.

Magnetic glassy alloys for high frequency applications

A ferromagnetic amorphous metallic alloy strip is annealed to minimize exciting power rather than core loss. The strip has an exciting power less than 0.5 VA/kg when measured at 60 Hz and an operating induction of 1.40 to 1.45 Tesla, the measurement being carried out at ambient temperature. Cores composed of the strip can be run at higher operating induction than those annealed to minimize core loss. The physical size of the transformer's magnetic components, including the core, is significantly reduced.

Amorphous alloy with increased operating induction

A rapidly solidified amorphous metallic alloy is composed of iron, boron, silicon and carbon. The alloy exhibits in combination high saturation induction, high Curie temperature, high crystallization temperature, low core loss and low exciting power at line frequencies and is particularly suited for use in cores of transformers for an electrical power distribution network.

Amorphous Fe-B-Si-C alloys having soft magnetic characteristics useful

A casting wheel quench surface rapidly solidifies molten alloy into strip having a microcrystalline or amorphous structure. The surface is composed of a thermally conducting alloy having a homogeneous microstructure consisting of fine equiaxed recrystallized grains. The grains exhibit a tight Gaussian grain size distribution.

Casting wheel having equiaxed fine grain quench surface

A quench substrate for rapid solidification of molten alloy into strip has a microcrystalline or amorphous structure. The substrate is composed of a thermally conducting alloy and the structure is substantially homogeneous. The substrate is a thermal conducting material such as copper or a copper alloy, and has a constituent grain size uniformity greater than 1 .mu.m and less than 1,000 .mu.m in size.

Homogeneous quench substrate

This invention is directed to metallic alloy consisting essentially of iron, boron and silicon and having a composition in the region A, B, C, D, E, F, A of FIG. 1, said alloy having a crystallization temperature of at least about 490.degree. C., a saturation magnetization value of at least about 174 emu/g at 25.degree. C., a core loss not greater than about 0.3 W/kg, measured at 25.degree. C., 60 Hz and 1.4 T after having been annealed at 360.degree. C. for about 2000 seconds, a core loss not greater than about 0.3 W/kg, measured at 25.degree. C., 60 Hz and 1.4 T after having been annealed at about 380.degree. C. for a time ranging from about 1000 to about 2000 seconds, an exciting power requirement not greater than about 1 VA/kg, measured at 25.degree. C., 60 Hz and 1.4 T after having been annealed at 360.degree. C. for about 2000 seconds, an exciting power requirement not greater than about 1 VA/kg, measured at 25.degree. C., 60 Hz and 1.4 T after having been annealed at 380.degree. C. for about 1000 seconds, a fracture strain of at least about 0.03, measured at 25.degree. C. for the alloy after having been annealed at about 360.degree. C. for about 1.5 hours, and a fracture strain of at least about 0.03, measured at 25.degree. C. for the alloy after having been annealed at about 380.degree. C. for about 1.5 hours. The alloys exhibit improved utility and handleability in the production of magnetic cores used in the manufacture of electric distribution and power transformers.

Amorphous Fe-B-Si alloys exhibiting enhanced AC magnetic properties and

An apparatus and method for casting metal strip include a moving chill body that has a quench surface. A nozzle mechanism deposits a stream of molten metal on a quenching region of the quench surface to form the strip. The nozzle mechanism has an exit portion with a nozzle orifice. A depletion mechanism supplies a reducing gas to a depletion region located adjacent to and upstream from the quenching region. The reducing gas reacts exothermically to lower the density provide a low density reducing atmosphere within the depletion and substantially prevent formation of gas pockets in the strip.

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Succasunna, NJ, United States of America

Howard Horst Liebermann