Effect of the TiO2 nanoparticle size on the decomposition behaviors in aluminum matrix composites

J. H. Shin, D. H. Bae

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The decomposition behaviors and the effect of particle size on the kinetic rate are studied for Al-3 vol.% titanium dioxide (TiO2) composites by using three different types of TiO2 particles (15, 50, and 300 nm). Thermal analysis shows that the reaction is stepwise with the first reaction starting before the melting temperature of Al. Since the high chemical potential of nanoparticles enhances reactivity, the TiO, Al3Ti, and α-Al2O3 phases are found to be formed during the first reaction regardless of particle size. Based on observations of microstructure, the formation mechanism of Al3Ti and α-Al 2O3 is understood to be solution precipitation. Non-isothermal kinetic analysis reveals that the reaction mechanism is closely related to the three-dimensional continuous nucleation and the growth limited by diffusion. Particle size is found to be having considerable effect on the kinetic rate. As the particle size decreases, the rate constant increases, while the pre-exponential factor and the activation energy decreases. A non-linear relationship between the rate constant and the reciprocal of the size is found and evaluated.

Original languageEnglish
Pages (from-to)1423-1430
Number of pages8
JournalMaterials Chemistry and Physics
Volume143
Issue number3
DOIs
Publication statusPublished - 2014 Feb 14

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Aluminum
Particle size
Nanoparticles
Decomposition
aluminum
decomposition
nanoparticles
composite materials
Composite materials
matrices
Kinetics
Rate constants
kinetics
Chemical potential
Titanium dioxide
Thermoanalysis
Melting point
Nucleation
Activation energy
titanium oxides

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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abstract = "The decomposition behaviors and the effect of particle size on the kinetic rate are studied for Al-3 vol.{\%} titanium dioxide (TiO2) composites by using three different types of TiO2 particles (15, 50, and 300 nm). Thermal analysis shows that the reaction is stepwise with the first reaction starting before the melting temperature of Al. Since the high chemical potential of nanoparticles enhances reactivity, the TiO, Al3Ti, and α-Al2O3 phases are found to be formed during the first reaction regardless of particle size. Based on observations of microstructure, the formation mechanism of Al3Ti and α-Al 2O3 is understood to be solution precipitation. Non-isothermal kinetic analysis reveals that the reaction mechanism is closely related to the three-dimensional continuous nucleation and the growth limited by diffusion. Particle size is found to be having considerable effect on the kinetic rate. As the particle size decreases, the rate constant increases, while the pre-exponential factor and the activation energy decreases. A non-linear relationship between the rate constant and the reciprocal of the size is found and evaluated.",
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Effect of the TiO2 nanoparticle size on the decomposition behaviors in aluminum matrix composites. / Shin, J. H.; Bae, D. H.

In: Materials Chemistry and Physics, Vol. 143, No. 3, 14.02.2014, p. 1423-1430.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of the TiO2 nanoparticle size on the decomposition behaviors in aluminum matrix composites

AU - Shin, J. H.

AU - Bae, D. H.

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N2 - The decomposition behaviors and the effect of particle size on the kinetic rate are studied for Al-3 vol.% titanium dioxide (TiO2) composites by using three different types of TiO2 particles (15, 50, and 300 nm). Thermal analysis shows that the reaction is stepwise with the first reaction starting before the melting temperature of Al. Since the high chemical potential of nanoparticles enhances reactivity, the TiO, Al3Ti, and α-Al2O3 phases are found to be formed during the first reaction regardless of particle size. Based on observations of microstructure, the formation mechanism of Al3Ti and α-Al 2O3 is understood to be solution precipitation. Non-isothermal kinetic analysis reveals that the reaction mechanism is closely related to the three-dimensional continuous nucleation and the growth limited by diffusion. Particle size is found to be having considerable effect on the kinetic rate. As the particle size decreases, the rate constant increases, while the pre-exponential factor and the activation energy decreases. A non-linear relationship between the rate constant and the reciprocal of the size is found and evaluated.

AB - The decomposition behaviors and the effect of particle size on the kinetic rate are studied for Al-3 vol.% titanium dioxide (TiO2) composites by using three different types of TiO2 particles (15, 50, and 300 nm). Thermal analysis shows that the reaction is stepwise with the first reaction starting before the melting temperature of Al. Since the high chemical potential of nanoparticles enhances reactivity, the TiO, Al3Ti, and α-Al2O3 phases are found to be formed during the first reaction regardless of particle size. Based on observations of microstructure, the formation mechanism of Al3Ti and α-Al 2O3 is understood to be solution precipitation. Non-isothermal kinetic analysis reveals that the reaction mechanism is closely related to the three-dimensional continuous nucleation and the growth limited by diffusion. Particle size is found to be having considerable effect on the kinetic rate. As the particle size decreases, the rate constant increases, while the pre-exponential factor and the activation energy decreases. A non-linear relationship between the rate constant and the reciprocal of the size is found and evaluated.

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