Mechano-Chemical Synthesis of TiB₂-Al₂O₃ Nano-Composite by Reaction between TiO₂, B₂O₃ and Al

Abstract:

In this research a composite structure containing of a TiB₂ matrix with dispersed Al₂O₃ particles was obtained via mechanical alloying of Al, TiO₂ and B₂O₃ powder mixture. The mixture was milled for different lengths of time. Phase evolutions of the milled powder mixture were investigated. Powder particle characteristics were evaluated by XRD, SEM and TEM techniques. The XRD results reveal that the reaction begins during first 10 h milling by formation of TiB₂ and Al₂O₃¬ phases and further milling causes partial amorphization of powder mixture. SEM micrograph of the sample milled for 30 h exhibited ultrafine particles of Al₂O₃-TiB₂, but TEM images show that particles consist of some grains in the range of nano-size. The mean crystallite size of final product is about 25 nm.

• Periodical: Advanced Materials Research (Volumes 488-489)
• Pages: 955-959
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.488-489.955
• Online since: March 2012
• Authors: Amin Rabiezadeh, Abolghasem Ataie, Ali Mohammad Hadian
• Keywords: Mechano-Chemical, Nanocomposite, Solid-State Synthesis, TiB₂, X-Ray Diffraction (XRD)

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