OXIDATION OF Nb-Zr ALLOYS
Journal Article
·
· Izv. Akad. Nauk SSSR, Otd. Tekhn. Nauk, Met. i Gorn. Delo
OSTI ID:4712362
The effect of Zr on the oxidation resistance of Nb-- Zr alloys containing 0.25, 0.5, 1.5, 10, 15, 20, 25, 30, 40, or 50% Zr was investigated. Alloy specimens were obtained by compacting ZrI/sub 2/ and 99.78% pure Nb and melting the compacts in an unconsumable-electrode arc furnace in an Ar atmosphere under a pressure of 250 mm Hg. Specimens were oxidized in air at 1600, 1120, and 1260 deg C for 1, 2, 3, 5, and 10 hrs. Zr at contents of 6.25 to 10% was found to accelerate oxidation; however, a further increase of Zr content up to 56% lowers the oxidation rate continuously. An alloy with 50% Zr oxidizes at a rate of approximates 10, 18, or 25 mg/cm/sup 2/ hr at 1000, 1100, or 1200 deg C, respectively. The oxidation of alloys with 40 and 50% Zr at 1000 and 1100 deg C follows a nearly parabolic rate, which indicates that the oxide film has a protective ability. At 1200 deg C the oxidation rate is linear. The scale of alloys with up to 25% Zr is loose and separates from the metal. In an alloy with 50% Zr, the scale adheres tightly to the metal. A thin sub-layer please delete the above abstract no. 29291====
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-029291
- OSTI ID:
- 4712362
- Journal Information:
- Izv. Akad. Nauk SSSR, Otd. Tekhn. Nauk, Met. i Gorn. Delo, Journal Name: Izv. Akad. Nauk SSSR, Otd. Tekhn. Nauk, Met. i Gorn. Delo Vol. Vol: o. 1
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
ARGON
COMPACTING
DIFFRACTION
DIFFUSION
ELECTRIC ARCS
FILMS
FURNACES
HARDNESS
HIGH TEMPERATURE
LATTICES
LAYERS
MELTING
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM
NIOBIUM ALLOYS
NIOBIUM OXIDES
OXIDATION
PHASE DIAGRAMS
PRESSURE
QUANTITY RATIO
SAMPLING
STABILITY
X RADIATION
ZIRCONIUM
ZIRCONIUM ALLOYS
ZIRCONIUM IODIDES
ZIRCONIUM OXIDES
COMPACTING
DIFFRACTION
DIFFUSION
ELECTRIC ARCS
FILMS
FURNACES
HARDNESS
HIGH TEMPERATURE
LATTICES
LAYERS
MELTING
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM
NIOBIUM ALLOYS
NIOBIUM OXIDES
OXIDATION
PHASE DIAGRAMS
PRESSURE
QUANTITY RATIO
SAMPLING
STABILITY
X RADIATION
ZIRCONIUM
ZIRCONIUM ALLOYS
ZIRCONIUM IODIDES
ZIRCONIUM OXIDES