Accession Number : ADA017091

Title :   Development and Evaluation of Refractory Materials for Advanced Interceptor Air Vanes.

Descriptive Note : Final rept. 29 May 74-28 Feb 75,


Personal Author(s) : Ossin,Archie ; Lippy,David P.

Report Date : SEP 1975

Pagination or Media Count : 107

Abstract : This document reports the results of a nine-month research study entitled Development and Evaluation of Refractory Materials for Advanced Interceptor Air Vanes. The overall objective of this program was to define the recession performance of three tungsten alloy materials over the entire advanced interceptor flight regime. The materials evaluated were (1) tungsten hafnium carbide (arc cast), (2) thoriated tungsten (powder metallurgy), and (3) tungsten-copper (copper infiltrated). This selection was based on the results of previous work accomplished under AMMRC Contract DAAG46-74-C-0051. The recession performance evaluation of these materials includes both experimental and analytical work. Recession data, experimentally obtained at the 5 MW plasma arc at Martin Marietta's Denver Division and at the 50 MW plasma arc at Wright-Patterson Air Force Base, have been incorporated into an analytical model. This model has been used to define interceptor flight regimes for which refractory air vanes are applicable. The results of this program show that, at air vane leading edge stagnation line pressures of interest, the tungsten hafnium carbide (arc cast) material has superior performance compared to the other materials tested. Analyses, based upon these data, show that a tungsten hafnium carbide (arc cast) air vane leading edge can perform with an acceptable amount of surface recession in the 15000 ft/s burnout velocity regime for an advanced antiballistic missile. (Author)

Descriptors :   *Antimissile defense systems, *Interceptors, Guided missiles, Leading edges, Tungsten alloys, Ablation, Models, Stagnation, Pyrometers, Steady state

Subject Categories : Antimissile Defense Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE