Northrop Grumman Systems Corporation

Gte Laboratories Incorporated

Vought Aircraft Industries, Inc.

Carmine Persiani

James A Clarke

Alfred E Feuersanger

Frank C Palilla

Francis X Pink

Paul Lublin

A heat absorbing coating having a plurality of micro-capsules each being an encapsulant shell and a heat absorbing material within the shell, and a carrier adherable to a substrate and throughout which the micro-capsules are dispersed. The heat absorbing material is preferably a phase change material and can be non-limitedly chosen from the group consisting of polyethylene, polypropylene, polywax, and combinations thereof. Shell material can be a metal such as copper, for example, or a polymer. The carrier can be a sprayable polymer mix which provides significant efficacy in uniform application to a substrate. An inventive substrate structure, such as an aircraft structure for example, has thereon the above-defined coating in an amount sufficient to absorb a sufficient amount of heat from the substrate to substantially inhibit thermal erosion in normal operating environments.

Heat absorbing surface coating

Plasma spraying of particulate thermotropic liquid crystalline polymers onto the surfaces of composite and metallic structures. The present plasma spray process employs a conventional direct current electric arc plasma spray gun in which an inert plasma gas is introduced, caused to swirl, and discharges as a rotating plasma flame having an exceptionally high temperature, above about 14000.degree. K, into which the particulate liquid crystal polymer is discharged for melting and propulsion onto the target surface. The target surface preferably is preheated, and the molten particles deposit and cool to form a build up of the desired thickness. Cooling is regulated by post-heating the deposit to a temperature between about 200.degree. F. and 500.degree. F.

Liquid crystal polymer coating process

A high pressure sodium lamp brightness was increased 8.9%, its relative voltage stability was improved by a factor of 4, and its relative maintenance was improved by a factor of 3 over a 24,000 hour lifetest. These improvements were accomplished by the application of a fine grained alumina protctive coating on the surface of the polycrystalline alumina arc tube. The process for applying the protective coating comprises the deposition of Al(NO.sub.3).sub.3 from solution on the surface of the arc tube followed by the thermal decomposition of the Al(NO.sub.3).sub.3 to form an alumina coating on the surface of the alumina arc tube.

Discharge lamps with coated ceramic arc tubes and fabrication thereof

The pressure of a gas in a closed vessel can be non-destructively read by irradiating the closed vessel with x-rays. The irradiated gases in the vessel emit x-rays characteristic of various gases within the vessel. The characteristic x-rays, which pass out of the vessel, are discriminated and their intensity count converted to a pressure reading.

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Medford, NY, United States of America

Carmine Persiani