AustralieFrV1, Main, Exploration, bibRecord, 008747

Self‐Propagating High‐Temperature Synthesis of Ti3SiC2: II. Kinetics of Ultra‐High‐Speed Reactions from In Situ Neutron Diffraction

Identifieur interne : 008747 ( Main/Exploration ); précédent : 008746; suivant : 008748

Self‐Propagating High‐Temperature Synthesis of Ti3SiC2: II. Kinetics of Ultra‐High‐Speed Reactions from In Situ Neutron Diffraction

Auteurs : Daniel P. Riley [Australie] ; Erich H. Kisi [Australie] ; Thomas C. Hansen [France]

Source :

Journal of the American Ceramic Society [ 0002-7820 ] ; 2008-10.

RBID : ISTEX:2A078E0C83F9E9BC4371756C30B6CE66B8369B48

Descripteurs français

Pascal (Inist)
- Carbure, Cinétique, Combustion autopropagée, Céramique sans oxyde, Céramique technique, Diffraction neutron, Etude expérimentale, Fabrication, In situ, Silicium Carbure, Silicium Titane Carbure Mixte, Synthèse combustion, Ti3SiC2, Titane Carbure.
Wicri :
- topic : Céramique technique.

English descriptors

Abstract

In situ neutron diffraction data at 0.9‐s time resolution during the self‐propagating high‐temperature synthesis of Ti3SiC2 from stoichiometric 3Ti+SiC+C mixtures have been further analyzed to give the phase quantities during all five stages of the identified reaction [(i) preheating, (ii) α→β phase transformation in Ti, (iii) preignition reactions, (iv) intermediate phase formation, and (v) rapid nucleation and growth of Ti3SiC2]. The phase quantities thus determined have been used, in conjunction with temperatures estimated from lattice parameters and thermal expansion data, to determine the kinetic parameters for the nucleation and growth stage using a nonisothermal form of the Avrami kinetic equation. The analysis gave an Avrami exponent, n, close to 3 in agreement with nucleation and the observed two‐dimensional growth of Ti3SiC2 crystals. An activation energy of ∼45 kJ/mol was also estimated.

Url:

https://api.istex.fr/document/2A078E0C83F9E9BC4371756C30B6CE66B8369B48/fulltext/pdf

DOI: 10.1111/j.1551-2916.2008.02637.x

Affiliations:

Le document en format XML

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<term>Neutron diffraction data</term>
<term>Neutron diffraction patterns</term>
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<term>Nonisothermal form</term>
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<term>Preignition formation</term>
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<term>Quantitative phase analysis</term>
<term>Reactant</term>
<term>Reaction kinetics</term>
<term>Reaction mechanism</term>
<term>Reaction rate</term>
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<term>Reactive sintering</term>
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<term>Reaction mechanism</term>
<term>Reaction rate</term>
<term>Reaction sequence</term>
<term>Reaction sintering phenomena</term>
<term>Reactive</term>
<term>Reactive sintering</term>
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<front><div type="abstract">In situ neutron diffraction data at 0.9‐s time resolution during the self‐propagating high‐temperature synthesis of Ti3SiC2 from stoichiometric 3Ti+SiC+C mixtures have been further analyzed to give the phase quantities during all five stages of the identified reaction [(i) preheating, (ii) α→β phase transformation in Ti, (iii) preignition reactions, (iv) intermediate phase formation, and (v) rapid nucleation and growth of Ti3SiC2]. The phase quantities thus determined have been used, in conjunction with temperatures estimated from lattice parameters and thermal expansion data, to determine the kinetic parameters for the nucleation and growth stage using a nonisothermal form of the Avrami kinetic equation. The analysis gave an Avrami exponent, n, close to 3 in agreement with nucleation and the observed two‐dimensional growth of Ti3SiC2 crystals. An activation energy of ∼45 kJ/mol was also estimated.</div>
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Self‐Propagating High‐Temperature Synthesis of Ti3SiC2: II. Kinetics of Ultra‐High‐Speed Reactions from In Situ Neutron Diffraction

Self‐Propagating High‐Temperature Synthesis of Ti3SiC2: II. Kinetics of Ultra‐High‐Speed Reactions from In Situ Neutron Diffraction

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

	Serveur d'exploration sur les relations entre la France et l'Australie
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