The effect of purity on the high-temperature oxidation of hafnium

The oxidation kinetics of hafnium of different purities were studied in the temperature range of 800-1200degreesC. This paper concerns the structure studies of the oxidized samples. TGA, XRD, SEM methods, and microhardness measurements were used. Hafnium oxidation follows the parabolic rate law, cha...

Full description

Saved in:
Bibliographic Details
Published in:Oxidation of metals 1994-10, Vol.42 (3-4), p.249-263
Main Authors: Voitovich, V. B., Lavrenko, V. A., Golovko, E. I., Adejev, V. M.
Format: Article
Language:English
Subjects:
360104 > Metals & Alloys-- Physical Properties
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
HAFNIUM
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
IMPURITIES
KINETICS
MATERIALS SCIENCE
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS 360105 > Metals & Alloys-- Corrosion & Erosion
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The oxidation kinetics of hafnium of different purities were studied in the temperature range of 800-1200degreesC. This paper concerns the structure studies of the oxidized samples. TGA, XRD, SEM methods, and microhardness measurements were used. Hafnium oxidation follows the parabolic rate law, changing with time to the linear one. Oxidation-reaction products are HfO2(moncl) and alpha-solid solution of oxygen in hafnium. Anomalous oxidation behavior of hafnium having a high impurity content was found in the range 800-950degreesC. Activation energies for the parabolic and linear oxidation stages were calculated. 23 refs., 7 figs. including 3 with photomicrographs.
ISSN:0030-770X
1573-4889
DOI:10.1007/BF01052026