Westinghouse Electric Corporation

Aluminum Company of America

Dana Canada Corporation

Richard A Hoffman

Wolfgang J Choyke

Brian Edward Cheadle

Dhruba J Chakrabarti

Richard H Hopkins

Kostas F Dockus

Craig L Jensen

Michael E Graham

Robert H Krueger

Stefanija Kisielius, Legal Representative

William E Kramer

Margaret Anna Hoffman, Legal Representative

A brazing product for fluxless brazing comprises a substrate and a filler metal-forming composition applied to the substrate. The substrate preferably comprises aluminum, an aluminum alloy or another metal and may include at least one layer of a ceramic, carbide or nitride. The filler metal-forming composition comprises a liquid-forming layer comprising silicon and a braze-promoting layer comprising one or more metals selected from the group comprising nickel, cobalt, palladium and iron. The liquid-forming layer comprises one or more material layers. Where the liquid-forming layer comprises a plurality of layers, it may include at least one layer consisting essentially of silicon.

Layered products for fluxless brazing of substrates

A memory media-ready substrate having a substrate, a hardening layer and a film made of a nonferromagnetic material that is disposed between the substrate and the film. A memory disk including the film and associated methods of making a hardening layer-ready substrate, the memory media-ready substrate and the memory disk are also provided.

Thin film pretreatment for memory disks and associated methods

The surface of a metal article which is exposed to the atmosphere and abrasion during normal use of the article is protected from scratches and/or corrosion during such use by a thin transparent abrasion-resistant film of an inert non-metallic material such as SiO.sub.2, SiC, Si.sub.3 N.sub.4, TiO.sub.2, MgO, Al.sub.2 O.sub.3, Ta.sub.2 O.sub.5, Nb.sub.2 O.sub.5, GeO.sub.2, spinel and selected colorless glass compositions. The protective film is preferably deposited by RF-sputtering techniques and undesirable coloration of the article by optical interference effects from incident light rays is avoided by properly correlating the film thickness with the refractive index of the particular material used to form the film. The invention permits the use of thinner gold plating on such items as articles of expensive jewelry and bracelets and cases for fine wristwatches without detracting from the quality, durability or appearance of the merchandise. Alternative embodiments in which several films of various selected non-metallic inert materials are combined to form composite protective coatings that provide additional cost and manufacturing advantages are also disclosed along with methods for sputter-depositing the protective films in the proper thicknesses to avoid optical discoloration effects, either on articles that have been previously plated with gold or which have been provided with a sputter-deposited layer of gold by sequentially operating the sputtering apparatus.

Method of coating a metallic article of merchandise with a protective

Article such as jewelry or a wristwatch component having composite

Protective coating means for articles such as gold-plated jewelry and

Protectively-coated gold-plated article of jewelry or wristwatch

A high power laser mirror and method of making the same are disclosed. Essentially the mirror consists of a refractory composition substrate which is polished to an optical finish and overcoated with a high reflectivity metal and a dielectric film disposed to cover the high reflectivity metal. The method includes the hot pressing of the refractory composition, especially silicon carbide, to form a substrate following which an optical finish is polished on one surface thereof. Thereafter, a metal film with a high reflectivity is applied to cover the optical surface and then a dielectric film is deposited over the high reflectivity metal film. Both films are deposited employing process of vacuum evaporation for deposition on the substrate. As thus combined, the mirror exhibits low optical absorptivity, high thermal conductivity, low weight, and low coefficient of thermal expansion. Since the substrate is formed of a hard refractory composition, an excellent optical finish can be polished on the surface thereof.

Hot pressed SiC-high power laser mirror

Method of making a high power laser mirror. Essentially the mirror consists of a refractory composition substrate which is polished to an optical finish and overcoated with a high reflectivity metal and a dielectric film disposed to cover the high reflectivity metal. The method includes the hot pressing of the refractory composition, especially silicon carbide, to form a substrate following which an optical finish is polished on one surface thereof. Thereafter, a metal film with a high reflectivity is applied to cover the optical surface and then a dielectric film is deposited over the high reflectivity metal film. Both films are deposited employing process of vacuum evaporation for deposition on the substrate. As thus combined, the mirror exhibits low optical absorptivity, high thermal conductivity, low weight, and low coefficient of thermal expansion. Since the substrate is formed of a hard refractory composition, an excellent optical finish can be polished on the surface thereof.

Method of making a high power laser mirror

An optical window is provided, particularly for multispectral or broadband wavelength (visible and infrared) transmission, which is resistant to damage or erosion by high velocity raindrops or other adverse environmental conditions. The window consists of a substrate of material having the necessary optical properties for the desired spectral range, with a cladding or protective layer of material of high resistance to erosion or other damage bonded to the substrate by a glass bonding material. While any suitable materials meeting the optical and physical requirements may be used, the substrate may be a material such as zinc selenide with a protective layer of zinc sulfide bonded to the substrate by a thin layer of a chalcogenide glass.

Composite erosion resistant optical window

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Export, PA, United States of America

Richard A Hoffman