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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,135 records · Page 63

Thermoelectric elements diffusion-bonded to tungsten electrodes

Solid-state diffusion process bonds lead telluride and lead telluride-tin telluride thermoelectric elements to tungsten electrodes. The resulting bond is nonmagnetic and has high strength and low electrical and thermal resistance. This method is also used with tantalum electrodes.

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Boron-deoxidized copper withstands brazing temperatures

Boron-deoxidized high-conductivity copper is used for fabrication of heat transfer components that are brazed in a hydrogen atmosphere. This copper has high strength and ductility at elevated temperatures and does not exhibit massive intergranular failure.

Schmidt, E. H.↗

Aluminum core structures brazed without use of flux

Aluminum alloy face sheets are brazed to aluminum alloy honeycomb cores without using corrosive flux by means of one or three methods. The completed brazed structure has the high-strength characteristics of heat treated aluminum alloys.

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Electroless nickel plating on stainless steels and aluminum

Procedures for applying an adherent electroless nickel plating on 303 SE, 304, and 17-7 PH stainless steels, and 7075 aluminum alloy was developed. When heat treated, the electroless nickel plating provides a hard surface coating on a high strength, corrosion resistant substrate.

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Joining of Nickel and Nickel-Base Alloys

Nickel and nickel- base alloys are amenable to joining with many of the familiar joining processes. Some new joining processes also have been used successfully. In general, conventional joining procedures are used with only slight required modifications, depend­ing on the particular alloy to be welded. However, some special precautions must be taken. Harmful materials must be removed from the joint or surrounding areas or they may damage the weld and the nearby heated parent metal. Some high-strength age­ hardenable alloys are prone to cracking in or near joint areas, unless the material is in the proper condition of heat treatment prior to joining operations. Foreign material and flux residues left from joining operations can cause trouble in subsequent service if not removed. Procedures for joining these alloys have been developed that eliminate or minimize the usual difficulties that have been experienced. When proper procedures are employed, joining of nickel and nickel- base alloys can be performed satisfactorily.

Vagi, J. J.↗

Study of stress corrosion in aluminum alloys

Mechanism of the stress corrosion cracking of high-strength aluminum alloys was investigated using electrochemical, mechanical, and electron microscopic techniques. The feasibility of detecting stress corrosion damage in fabricated aluminum alloy parts by nondestructive testing was investigated using ultrasonic surface waves and eddy currents.

Brummer, S. B.↗