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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Jieguang Song & Lianmeng Zhang & Junguo Li & Jianrong Song, 2007. "THERMODYNAMIC AND KINETIC ANALYSES OF SYNTHESIZINGZrB2@Al(OH)3–Y(OH)3CORE–SHELL COMPOSITE PARTICLES," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 14(01), pages 117-122.
    • Handle: RePEc:wsi:srlxxx:v:14:y:2007:i:01:n:s0218625x07009190
    DOI: 10.1142/S0218625X07009190
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