Accession Number:

AD0256658

Title:

DEVELOPMENT OF TANTALUM-TUNGSTEN ALLOYS FOR HIGH PERFORMANCE PROPULSION SYSTEM COMPONENTS

Descriptive Note:

Corporate Author:

NATIONAL RESEARCH CORP CAMBRIDGE MASS

Personal Author(s):

Report Date:

1961-01-09

Pagination or Media Count:

1.0

Abstract:

Efforts were directed toward evaluating the effects of the A-3 propellant upon the higher W content alloys and carburized pure Ta. The effects of carbide thickness and tantalum substrate thickness were evaluated using A-3 Merm testing conditions. The addition of W strongly increased the resistance to rocket nozzle exhaust gases. No erosion occurred in Ta-10 and -20 W inserts in the standard Atlantic Research Corporation Arcite 373 firings. Jetavator bar firings at ARC exhibited increasing resistance as the W content was increased to 30. Forged full-scale inserts of Ta-10 W were adequate for Polaris A-2 second stage conditions but failed at higher mass rates of flow. An insert of pure Ta carburized to a depth of 0.030 in. showed no erosion in a standard Arcite 373 test firing. Alloys containing up to 30 W were cast and machined. The fabrication procedures for sheet, rod, wire and shape forgings was established for Ta-10 W. Ta-20 W ingots were extrued and upset forged. Physical, mechanical and metallurgical properties were determined for the Ta-10 W alloy at room and elevated temperatures. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE