117 resultados para Precious metals.


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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.

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"Materials Central, Contract No. AF33(616)-5905, Project No. 7351."

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"April 15, 1943."

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v. 1. Texts.--v. 2. Tables.

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Item 231-B-1

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Work performed at the Sylvania-Corning Nuclear Corporation under contract AT-30 GEN-366.

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The hot isostatic pressing process has been applied at temperatures up to 1500°C for the fabrication of high temperature fuel rods composed of UO₂ clad in columbium and UO₂ in iron-aluminum type alloy. The fused UO₂ powder apparently becomes quite plastic at temperatures above 1200°C and can be isostatically compacted at 1500°C to 98% of its theoretical density. Columbian tubes particularly lend themselves to the fabrication of fuel rods by simultaneously compacting and cladding UO₂ powders in the tubes, but the cast iron-aluminum type alloy that was used was unsatisfactory because of its brittleness.