Role of excess Al on the combustion reaction in the Al-TiO2-C system

Je Woo Kim, Jung Moo Lee, Joonho Lee, Jae-chul Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Of various systems that utilize a self-propagating high-temperature synthesis, the Al-TiO2-C system is representative of in-situ production of metal matrix composites reinforced with TiC and Al2O3. Contrary to common understanding, however, the following reaction 4Al + 3TiO2 + 3C→3TiC + 2Al2O3 is infeasible in the Al-TiO2-C system with the given stoichiometric composition of 4Al + 3TiO2 + 3C. Experiments have shown that the formation of TiC and Al2O3 is feasible only in an Al-TiO2-C system that contains a certain amount of excess Al. In this study, the mechanism of the reactions in the Al-TiO2-C system was elucidated in order to explain why excess Al is needed to promote the formation of TiC and Al2O3. We also estimated the amount of excess Al that is necessary to promote the complete transformation of the Al-TiO2-C powders to TiC and Al2O3.

Original languageEnglish
Pages (from-to)1151-1156
Number of pages6
JournalMetals and Materials International
Volume20
Issue number6
DOIs
Publication statusPublished - 2014 Nov 16

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Keywords

  • alloys
  • composites
  • differential thermal analysis
  • metal matrix composites
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials
  • Materials Chemistry

Cite this

Role of excess Al on the combustion reaction in the Al-TiO2-C system. / Kim, Je Woo; Lee, Jung Moo; Lee, Joonho; Lee, Jae-chul.

In: Metals and Materials International, Vol. 20, No. 6, 16.11.2014, p. 1151-1156.

Research output: Contribution to journalArticle

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AB - Of various systems that utilize a self-propagating high-temperature synthesis, the Al-TiO2-C system is representative of in-situ production of metal matrix composites reinforced with TiC and Al2O3. Contrary to common understanding, however, the following reaction 4Al + 3TiO2 + 3C→3TiC + 2Al2O3 is infeasible in the Al-TiO2-C system with the given stoichiometric composition of 4Al + 3TiO2 + 3C. Experiments have shown that the formation of TiC and Al2O3 is feasible only in an Al-TiO2-C system that contains a certain amount of excess Al. In this study, the mechanism of the reactions in the Al-TiO2-C system was elucidated in order to explain why excess Al is needed to promote the formation of TiC and Al2O3. We also estimated the amount of excess Al that is necessary to promote the complete transformation of the Al-TiO2-C powders to TiC and Al2O3.

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