Oxidation of silicide coatings on niobium and its alloys VN-2 and VN-3

Journal Article · Wed Jan 01 00:00:00 EST 1975 · Prot. Met. (USSR) (Engl. Transl.); (United States)

OSTI ID:7361640

Tsirlin, M S; Kasatkin, A V; Byalobzheskii, A V

The kinetics of silicized Nb alloy oxidation were investigated. It was found that the relatively low heat resistance of silicide coatings on niobium and VN-2 and VN-3 alloys at 1200 to 1400/sup 0/C is due to the formation of the higher niobium oxide Nb/sub 2/O/sub 5/ during oxidation, in addition to amorphous silica. The stage-by-stage character of the oxidation of coated samples is associated with the formation (under the oxide film) of a heterophase zone comprising a mixture of higher and lower niobium silicides. The presence of microcracks has a considerable influence on the oxidation process at 1400/sup 0/C.

• Research Organization: Inst. of Physical Chemistry, Moscow
• OSTI ID: 7361640
• Journal Information: Prot. Met. (USSR) (Engl. Transl.); (United States), Vol. 11:5; Other Information: Translated from Zashch. Met.; 11: No. 5, 592-596(1975)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOY-VN-2
DIFFUSION COATING
OXIDATION
ALLOY-VN-3
NIOBIUM SILICIDES
AIR
CRACKS
REACTION KINETICS
VERY HIGH TEMPERATURE
ALLOYS
CARBON ADDITIONS
CHEMICAL REACTIONS
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
DEPOSITION
FLUIDS
GASES
HEAT RESISTING ALLOYS
KINETICS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
NIOBIUM COMPOUNDS
SILICIDES
SILICON COMPOUNDS
SURFACE COATING
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM ALLOYS
360205* - Ceramics
Cermets
& Refractories- Corrosion & Erosion