General Electric Company

United States of America As Represented by the Administrator of Nasa

Frederick W Dynys

Thomas G Parham

Curtis E Scott

John M Davenport

Gary Robert Allen

Richard L Hansler

Frederic F Ahlgren

Mark E Duffy

Rolf S Bergman

Rajasingh Schwartz Israel

Tianji Zhao

Thomas M Golz

Carl V Gunter

Ali Sayir

Systems, methods, and other embodiments associated with multi-phase ceramic composites are described herein. Specifically, a multi-phase ceramic composite having a microstructure having at least one solid-state lubricant phase and at least one wear resistant material phase.

Multi-phase ceramic system

A reflector lamp has a generally parabolic shaped housing ( ) with an interior surface coated with a layer ( ) of silver having a protective layer ( ) of a stable protective oxide, such as silica, disposed thereon. An intermediate layer ( ), such as a layer of elemental silicon, protects the silver layer during deposition of the silica layer and is completely or substantially consumed during formation of the silica layer. The lamp includes a light source ( ) having a longitudinal axis (x) disposed on the parabolic reflector axis and preferably disposed outward of the parabolic focus (F). During lamp fabrication, the protective coating is preferably annealed to improve reflectance. The preferred lamp will have a lumens per watt greater than 14.

Protected coating for energy efficient lamp

A method of making a component of a ceramic discharge chamber comprising the steps of forming a ceramic composition including an aluminum powder, a binder and a grain growth inhibitor. The alumina powder has a tap density greater than 1.0 gram per cc. The ceramic composition is then die pressed to form a component preform. Next, the component preform is heated to remove at least a substantial portion of the binder.

Die pressing arctube bodies

A method of making a ceramic discharge chamber comprising forming a plurality of preform chambers by assembling at least two ceramic components. The preform chambers are axially aligned within a tube, comprised of an alumina cermet. The tube containing the preform chambers is then fired at a temperature of at least 900&deg; C.

Cermet sintering of ceramic discharge chambers

An interference filter or coating is provided in a predetermined pattern on a lamp envelope. The coating is comprised of alternating layers of high and low index of refraction materials applied to a vitreous outer surface of a lamp envelope. The coating may be geometrically symmetric or asymmetric, continuous or discontinuous with respect to the coating itself or the envelope to which it has been applied. The envelope can be masked prior to deposition of the coating so that removal of the mask leaves the filter in the desired pattern. The preferred process for forming the coating includes forming a boric oxide mask on a portion of the envelope, applying the coating over the mask and removing the coating from masked areas of the envelope by dissolving the mask in an aqueous solution.

Patterned optical interference coatings for electric lamps

Patterned optical interference coatings for only a portion of a high

An optical interference filter produced on a vitreous, light transmissive substrate, such as an electric lamp envelope, includes a plurality of alternating layers of tantala and silica in which each tantala layer includes titania in an amount of less than about 10 mole % whereby the microstructure of the tantala layers is controlled during subsequent crystallization and extrinsic stress in the tantala layers is reduced. Rather than or in addition to including titania in each tantala layer, the present invention additionally contemplates placing at least some of the tantala layers in contact with a titania layer (pre-layer and/or post-layer) whereby the microstructure of the tantala layers is controlled during subsequent crystallization and extrinsic stress in the tantala layers is reduced. The optical interference filters are produced by a process comprising depositing a plurality of alternating layers of tantala and silica on a vitreous, light transmissive substrate from respective precursors thereof by CVD, preferably LPCVD, to form a coated substrate. The filter may then be heated for a time and to a temperature effective to crystallize the tantala, preferably to a temperature ranging from about 550.degree. to about 800.degree. C. and holding same within that temperature range for at least about one hour.

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Chagrin Falls, OH, United States of America

Frederick W Dynys