INVESTIGATION OF DIFFUSION BARRIERS FOR REFRACTORY METALS. Progress Report No. 7, April 15 to July 15, 1961

Technical Report · Tue Jul 25 00:00:00 EDT 1961

OSTI ID:4837092

Screening studies at 1700 deg C were continued on basebarnier combinations. The Nb-- Hf combination exhibited a degree of interdiffusion beyond the arbitrary limit for promising combinations. Comparison of the interdiffusion behavior of the Nb-- Re combination with that of combinations of Re barriers and Nb-- alloy base metals showed no significant change due to alloying of the Nb On the other hand, the presence of Ti in the Mo + 0.5 Ti alloy apparently resulted in a decrease of the extent of interdiffusion with Re, as compared to unalloyed Mo base metal. Comparison of the extent of interdiffusion in 5 combinations of barrier metals with the coating metal, Cr, showed that the Re--Cr combination exhibited the least interdiffusion. Interdiffusion studies in the 3-layer combinations of Mo--Re--Cr and Mo--Ir-- Cr indicated that the presence of a barrier can reduce the extent of interdlffusion between the Mo base and the Cr coating by up to 75%. (auth)

• Research Organization: Manufacturing Labs., Inc., Cambridge, Mass.
• NSA Number: NSA-15-029713
• OSTI ID: 4837092
• Report Number(s): NP-10666
• Country of Publication: United States
• Language: English

Related Subjects

BARRIERS
CHROMIUM
CHROMIUM ALLOYS
COATING
DIFFUSION
HAFNIUM ALLOYS
HIGH TEMPERATURE
IRIDIUM
LAYERS
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
REFRACTORIES
RHENIUM
RHENIUM ALLOYS
TITANIUM ALLOYS