Preparation of submicron spherical alumina powder by high-pressure hydrolysis of aluminum isopropoxide;

The microspherical alumina is widely used as catalyst or carrier in the fields of petrochemial industry and fine chemical industry on account of high specific surface area, large pore volume, excellent pore structure and proper pore size distribution maintaining the advantage of spherical form.

Adopting the isostatic pressing and hand-made to produce alumina ball respectively,the results shows that not only the ball's firing temperature and physical behavious,but also the wear regularity is influenced by the different forming methods.

The effect of diopside (CaMgSi 2O 6) as sintering_aid on the microstructure and wear resistance of 90% alumina ball was studied in this paper.

The effect of pores on wear behavior of alumina balls with average grain size 3, 6 and 15 μm is investigated in this paper.

Study on fracture mechanism of alumina bubble ceramic;

The lightweight alumina ceramic was prepared with alumina bubble and α-Al 2O 3 powder, and solution of Al 2(SO 4) 3· 18H 2O and NH 4Al(SO 4) 2·12H 2O and PVA as the cement, which will form in situ the nano γ-Al 2O 3 particles, to decreasing the sintering temperature as sintering agent, and improving the strengthen of the ceramics.

A wet chemical method was cidopted to introduce alumina sol to surface-modification of alumina bubble and in-situ decomposition characteristics, distribution of alumina sol, mi-crostructure and mechanical properties of surface-modified alumina bubble were studied by SEM, XRD, Coulter LS Particle Size Analyzer and self-preparation experimental device for measurement of compressive resistance.