INVESTIGATION OF DIFFUSION BARRIERS FOR REFRACTORY METALS
Thirty-three base barrier combinations involving the four refractory metals W, Mo, Ta, and Nb and 12 potential barrier metals having melting points over 1700 deg C were evaluated for relative interdiffusion behavior at 1700 and 1800 deg C. The relative extent of interdiffusion decreased with increasing base- barrier solidus temperature, although wide variations occurred for melting points up to 2100 deg C. Interdiffusion in the-Mo--Cr combination was found to be substantially reduced by the presence of a Re barrier. Re, Ru, and Ir barriers appeared optimum for W base metal; W, Re, Ru, and Ir appeared optimum for Ta; and W, Re, Os, and Zr appeared optimum for Nb. The thickness (X) of the total interdiffusion zone as well as of the intermediate phase layers in the W--Re, Mo-- Re, Ta--Re, and Nb--Re combinations was found to increase with time (t) in accordance with the relationship X/sup n/ = kt, with values of n in the range 1.4 to 4.9. (auth)
- Research Organization:
- ManLabs, Inc., Cambridge, Mass.
- NSA Number:
- NSA-17-001918
- OSTI ID:
- 4772905
- Report Number(s):
- ASD-TDR-62-432
- Country of Publication:
- United States
- Language:
- English
Similar Records
INVESTIGATION OF DIFFUSION BARRIERS FOR REFRACTORY METALS. Progress Report No. 5, October 15, 1960 to January 15, 1961
INVESTIGATION OF DIFFUSION BARRIERS FOR REFRACTORY METALS. Progress Report No. 7, April 15 to July 15, 1961
Related Subjects
CHROMIUM ALLOYS
DIFFUSION
HIGH TEMPERATURE
IRIDIUM
LAYERS
MELTING POINTS
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM
MOLYBDENUM ALLOYS
NIOBIUM
NIOBIUM ALLOYS
OSMIUM
PHASE DIAGRAMS
REFRACTORIES
RHENIUM
RHENIUM ALLOYS
RUTHENIUM
TANTALUM
TANTALUM ALLOYS
THICKNESS
TUNGSTEN
TUNGSTEN ALLOYS
ZIRCONIUM
ZONES