Trends in the burning of hafnium in hydrogen by infiltration
Journal Article
·
· Combust., Explos. Shock Waves (Engl. Transl.); (United States)
Studies have been made on the combustion of titanium and zirconium in hydrogen, and it has been shown that a BETA solid solution of hydrogen in the metal is formed in the burning wave, while the hydride phase is formed as the product cools. The Hf-H/sub 2/ system differs from the Ti and Zr systems in that there is a much wider region of homogeneity for the hydride phase and a narrower region for the solid solution. An examination is conducted of the infiltration combustion and thermodynamic equilibrium in the Hf-H/sub 2/ system in the hydrogen pressure range 0-600 mm Hg. The dependence of the equilibrium composition on temperature under isobaric conditions is examined first. It is found that the leading stage in the wave is the formation of hafnium hydride with an fcc structure. This mechanism differs from the mechanisms for titanium and zirconium, where the wave produces a BETA solid solution of hydrogen in the metal. The pressure dependence of the combustion rate is analogous to the pressure dependence of the equilibrium composition, which is described by Sievert's law.
- Research Organization:
- Erevan
- OSTI ID:
- 6555055
- Journal Information:
- Combust., Explos. Shock Waves (Engl. Transl.); (United States), Journal Name: Combust., Explos. Shock Waves (Engl. Transl.); (United States) Vol. 19:1; ISSN CESWA
- Country of Publication:
- United States
- Language:
- English
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Combustion of a finely divided powder of a subgroup IVA metal in hydrogen
Journal Article
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Sun May 01 00:00:00 EDT 1983
· Combust., Explos. Shock Waves (Engl. Transl.); (United States)
·
OSTI ID:6705798
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Related Subjects
36 MATERIALS SCIENCE
360100* -- Metals & Alloys
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMBUSTION KINETICS
CRYSTAL STRUCTURE
DISPERSIONS
ELEMENTS
EQUILIBRIUM
HAFNIUM
HAFNIUM COMPOUNDS
HAFNIUM HYDRIDES
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
KINETICS
METALS
MICROSTRUCTURE
MIXTURES
NONMETALS
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
REACTION KINETICS
SOLID SOLUTIONS
SOLUTIONS
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELDS
360100* -- Metals & Alloys
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMBUSTION KINETICS
CRYSTAL STRUCTURE
DISPERSIONS
ELEMENTS
EQUILIBRIUM
HAFNIUM
HAFNIUM COMPOUNDS
HAFNIUM HYDRIDES
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
KINETICS
METALS
MICROSTRUCTURE
MIXTURES
NONMETALS
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
REACTION KINETICS
SOLID SOLUTIONS
SOLUTIONS
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELDS