945 resultados para Scrap metals


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This report describes a study of the reactions occurring in the spontaneous ignition of zirconium and titanium (and their alloys), with emphasis on the former. Conditions required for spontaneous ignition, including the effects of certain impurities, surface conditions, and composition of the atmosphere around the metal were investigated. In addition, the mechanism of ignition was studied by following the thermal history of the reactions during the first few milliseconds.

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Sponsored by the Atomic Energy Commission and the Bureau of Ships, Dept. of the Navy.

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"Department of Army Project no. 5B99-01-004, Ordnance R and D Project no. TB2-0001, Office of Ordnance Research Project no. 1348, Contract no. DA-19-020-ORD-3250."

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"ISC-198."

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"Paper to be presented at the 17th annual meeting and space Flight Exposition, American Rocket Society, Los Angeles, Calif., November 13-18, 1962."

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Mode of access: Internet.

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At head of title: U. S. Navy, Office of Naval Research, Research Contract N7-onr-329, Task Order II.

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"Contract AT-30-1-GEN-367."

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"Contract no. AT-30-1 GEN-366 ; Issued August 1955.

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Experimental evidence is presented which proves that voids formed during diffusion in brass are heterogeneously nucleated. The nuclei appear to be oxide particles, probably ZnO. When these are removed by re-melting, voids practically do not form upon subsequent dezincification. Brass which had been freed of void nucleation catalysts exhibited a considerably reduced tendency for grain boundary cracking during creep, and increased stress-rupture life.