Macrokinetics of thermal explosion in a niobium—aluminum system. I. Basic macrokinetic stages View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2000-03

AUTHORS

E. B. Pis’menskaya, A. S. Rogachev, S. G. Bakhtamov, N. V. Sachkova

ABSTRACT

The basic macrokinetic stages of a gas-free thermal explosion in an Nb-Al system with different stoichiometric ratios of the reagents are determined using scanning differential calorimetry, electron metallography, and microanalysis. Chemical interaction begins when aluminum melts (993 K) and proceeds slowly up to a temperature of 1020-1040 K, at which dramatic self-heating and acceleration of the reaction (thermal explosion) occur. Migration of the melt from the center of the sample to the surface layers and growth of droplets on the sample surface are observed at the stage of slow reaction, and the drops penetrate again into the sample at the stage of thermal explosion. The phases NbAl3 and Nb2Al are formed in the thermal explosion regardless of the initial stoichiometry of the composition; the differences are manifested only in the ratio of these phases and in the amount of residual (nonreacted) niobium. More... »

PAGES

193-197

References to SciGraph publications

Journal

TITLE

Combustion, Explosion, and Shock Waves

ISSUE

2

VOLUME

36

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02699359

DOI

http://dx.doi.org/10.1007/bf02699359

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1003121893


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