Combustion of a finely divided powder of a subgroup IVA metal in hydrogen

Journal Article · Sun May 01 04:00:00 EDT 1983 · Combust., Explos. Shock Waves (Engl. Transl.); (United States)

OSTI ID:6705798

Agababyan, E V; Kharatyan, S L

The propagation of a combustion wave in a porous metal specimen burning in a gaseous reagent is largely dependent on the dispersion of the metal particles, the porosity, the gas pressure, and the previous heat treatment. Infiltration combustion of titanium, zirconium and hafnium may burn layerwise or in a surface mode depending on these conditions, and the mode of burning has a decisive effect on the composition of the final product. Samples of titanium powder burned layerwise in hydrogen, regardless of the porosity, pressure or particle size. The same applied to specimens previously heat-treated or dehydrogenated. Hafnium and zirconium powders burn in the surface mode, while dehydrogenated ones burn in layer mode. Measurements show the dehydrogenated zirconium and hafnium to have a permeability 1.5 times as great as that of the initial material, with a commensurate increase in the combustion rate.

• Research Organization: Erevan
• OSTI ID: 6705798
• Journal Information: Combust., Explos. Shock Waves (Engl. Transl.); (United States), Journal Name: Combust., Explos. Shock Waves (Engl. Transl.); (United States) Vol. 18:6; ISSN CESWA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION KINETICS
COMBUSTION PRODUCTS
DEHYDROGENATION
DISPERSIONS
ELEMENTS
FLAME PROPAGATION
HAFNIUM
HEAT TREATMENTS
HYDROGEN
KINETICS
MATERIALS
METALS
NONMETALS
OXIDATION
PARTICLE SIZE
PERMEABILITY
POROSITY
POROUS MATERIALS
POWDERS
REACTION KINETICS
SIZE
THERMOCHEMICAL PROCESSES
TITANIUM
TRANSITION ELEMENTS
ZIRCONIUM