Accession Number : AD0746834

Title :   Modification and Control of Oxide Structures on Metals and Alloys: (Phase II).

Descriptive Note : Final technical rept. 20 Nov 70-20 Dec 71,

Corporate Author : WESTINGHOUSE ELECTRIC CORP PITTSBURGH PA ASTRONUCLEAR LAB

Personal Author(s) : Svedberg,Robert C.

Report Date : FEB 1972

Pagination or Media Count : 106

Abstract : The study was initiated to investigate the feasibility of modifying oxide defect structures to enhance oxidation protection of elevated temperature structural materials. Techniques are being investigated which are designed to modify the defect structure of equilibrium oxides which are characteristic of the parent structural material. The chemical diffusion coefficient of oxygen in Nb2O5 in TiO2:Nb2O5 niobate, and in HfO2:Nb2O5 niobate were determined using a thermogravimetric technique whereby the rate of change of oxygen composition was measured as a function of time as equilibrium was being achieved with a constant oxygen partial pressure. The oxidation behavior of niobium alloy B-1 (Nb-15Ti-10Ta-10W-2Hf-3Al) is reported for temperatures of 800, 1000, and 1200C.

Descriptors :   (*REFRACTORY METAL ALLOYS, *CORROSION INHIBITION), (*OXIDES, DIFFUSION), (*OXYGEN, *DIFFUSION), THERMOGRAVIMETRIC ANALYSIS, OXIDATION, NIOBIUM ALLOYS, HAFNIUM COMPOUNDS, TITANIUM COMPOUNDS, HEAT TREATMENT

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE