Mechanochemical synthesis of alumina-zirconia nanocomposite powder

作者：Ebrahimi Basabi M; Javadpour J^*; Rezaie H; Goodarzi M

来源：Advances in Applied Ceramics, 2008, 107(6): 318-321.

DOI：10.1179/174367508X289433

• Mechanochemical synthesis
• Al(2)O(3)-ZrO(2)
• Nanocomposite
• Heat treatment
• Phase development

The alumina-zirconia nanocomposite powder has been synthesised by mechanical activation of a dry powder mixture of AlCl(3), ZrCl(4) and CaO. Mechanical milling of the above raw materials with the conditions adopted in this study resulted in the formation of a mixture consisting of crystalline CaO and amorphous aluminium and zirconium chlorides phases. There was no sign of chemical reaction occurring during milling stage as evidenced by X-ray diffraction (XRD) studies. Subsequent heat treatment of the milled powder at 350 degrees C resulted in the occurrence of displacement reaction and the formation of ZrO(2) and Al(2)O(3) particles within a water soluble CaCl(2) matrix. The effect of higher temperature calcination on the phase development in this powder mixture was followed by XRD analysis. Scanning electron microscopy and differential thermal analysis were also used in the characterisation of the powders. Perhaps the most important observation in this study was the formation of alpha-Al(2)O(3) phase at a very low temperature of 400 degrees C.

• 出版日期2008-12