Abstract
Al2O3 whiskers with an average length of 5 μm have been synthesized from hydrothermal solution. Al(NO3)3 and urea were mixed and put into a Teflon-lined stainless steel autoclave and then treated at 120 °C to fabricate precursor whiskers NH4Al(OH)2CO3 (AACH). AACH whiskers were heated at 1200 °C in a furnace to obtain Al2O3 whiskers. The time-dependent examinations revealed that the formation process of AACH whiskers involves two sequential processes: a short liquid–solid deposition process in the initial stage and a long Ostwald ripening process. During calcinations, AACH transforms to amorphism then to α-Al2O3. The escape of NH3 and CO2 induced the distortion and toothlike morphology on the surface of the Al2O3 whiskers.
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