THERMODYNAMIC AND KINETIC ANALYSES OF SYNTHESIZINGZrB2@Al(OH)3–Y(OH)3CORE–SHELL COMPOSITE PARTICLES

Jieguang Song, Lianmeng Zhang (), Junguo Li and Jianrong Song
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Jieguang Song: State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Lianmeng Zhang: State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Junguo Li: State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Jianrong Song: State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Surface Review and Letters (SRL), 2007, vol. 14, issue 01, 117-122

Abstract: ZrB2has some excellent performances, but it is easily oxidized at high temperatures to impact the high-temperature strength, which restricts its applied range. To protect from the oxidization and improve the strength ofZrB2at high temperature, the surface ofZrB2particles is coated with theAl(OH)3–Y(OH)3shell to synthesizeZrB2@Al(OH)3–Y(OH)3core–shell composite particles. Through the thermodynamic and kinetic analyses of the heterogeneous nucleation and homogeneous nucleation, the concentration product of precursor ion (Y3+orAl3+) andOH-(Qi)must be greater than the solubility product(Ksp), respectively; the conditions ofY3+andAl3+are reached to produceAl(OH)3–Y(OH)3shell on theZrB2surface between theY3+line and theAlO2-line. Through TEM and XRD analyses,ZrB2@Al(OH)3–Y(OH)3core–shell composite particles are successfully synthesized by the co-precipitation method, the shell layer quality is better at pH = 9, which established the foundation for preparing high-performanceYAG/ZrB2andAl2O3–YAG/ZrB2multiphase ceramic materials.

Keywords: Thermodynamics and kinetics; ZrB2particles; core–shell composite particles; pH; co-precipitation method (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07009190

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