Abstract
In this presented work, α-Al2O3 is prepared from γ-Al2O3 by mechanical milling technique. Also the results obtained in studying the phase transformation of γ-Al2O3 into α-Al2O3 during intense mechanical activation by high-energy ball milling are presented. The powder samples were characterised by the commonly used bulk techniques of scanning electron microscope (SEM), differential thermal analysis (DTA), thermal gravimetric analysis (TGA) and X-ray diffraction (XRD) analyses. The results indicated that the pure γ-Al2O3 phase showed great stability and did not transform to any other phase even after a long milling time. On the other hand, γ-Al2O3, which contained a small amount of the a-alumina phase, showed a gradual phase transformation from γ-Al2O3 to α-Al2O3 on milling. The phase transformation mechanism during milling appears to be nucleation and growth type and promoted by the α-Al2O3 seed.
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