Influences of pH value on the microstructure and phase transformation of aluminum hydroxide

Effect of sintering temperatures on corrosion and wear properties of sol–gel alumina coatings on surface pre-treated mild steel

Preparation of ultrafine spherical AlOOH and Al2O3 powders by aqueous precipitation method with mixed surfactants

Alumina hydrates were prepared by the wet chemical method under different pH values and subsequently calcined through both conventional and microwave heating approaches. After calcination at 500 °C for 2 h, amorphous precursor was partially transformed to α-alumina. NH4NO3 remaining in the dried precursor without further washing after precipitation reaction was found to increase the transformation temperature, which is different from previous published results. Microwave calcination was also employed and can dramatically enhance the phase transformation rate in comparison with the conventional method. A combination of microwave heating and amorphous precursor may be a viable strategy to fabricate α-alumina at low temperatures rapidly.

https://iopscience.iop.org/article/10.1088/0022-3727/45/21/215302/pdf

Study of phase transformation behaviour of alumina through precipitation method

https://eprints.whiterose.ac.uk/76061/3/WRRO_76061.pdf

T Meher

Papers

Physicochemical characteristics of alumina gel in hydroxyhydrogel and normal form