X-ray photoelectron spectroscopy study of radiofrequency-sputterer refractory-compound steel interfaces

Technical Report · Wed Feb 01 04:00:00 EST 1978

OSTI ID:6556453

Wheeler, D R; Brainard, W A

Radiofrequency sputtering was used to deposit Mo/sub 2/C, Mo/sub 2/B/sub 5/, and MoSi2 coatings on 440C steel substrates. Both sputter etched and preoxidized substrates were used, and the films were deposited with and without a substrate bias of -300 V. The composition of the coatings was measured as a function of depth by X-ray photoelectron spectroscopy combined with argon ion etching. In the interfacial region there was evidence that bias produced a graded interface in Mo/sub 2/B/sub 5/ but not in Mo/sub 2/C. Oxides of iron and of all film constituents except carbon were present in all cases, but the iron oxide concentration was higher and the layer, thicker on the preoxidized substrates. The film and iron oxides were mixed in the MoSi2 and Mot/sup 2/C films but layered in the Mo/sub 2/B/sub 5/ film. The presence of mixed oxides correlates with enhanced film adhesion.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 6556453
• Report Number(s): N-78-20336; NASA-TP-1161; E-9374
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALLOYS
BORIDES
BORON COMPOUNDS
CARBIDES
CARBON ADDITIONS
CARBON COMPOUNDS
CARBON STEELS
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CHROMIUM STEELS
COATINGS
CORROSION RESISTANT ALLOYS
DEPOSITION
DISTRIBUTION
IRON ALLOYS
IRON BASE ALLOYS
MOLYBDENUM BORIDES
MOLYBDENUM CARBIDES
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
SILICIDES
SILICON COMPOUNDS
SPATIAL DISTRIBUTION
STAINLESS STEEL-440
STAINLESS STEELS
STEELS
TRANSITION ELEMENT COMPOUNDS