Synthesis and characterization of forsterite precursor effects of milling precursors on its crystallization and reactivity
Shiono Takeshi; Sato Ryoji; Shiomi Haruhisa; Minagi Takushi; Nishida Toshihiko
Abstract:Forsterite, Mg2SiO 4, precursor was synthesized from alkoxide solution containing MgO powder with average particle sizes of 0., 0.05 or 0.01 mu m. Effects of the particle size of MgO and milling of the precursor on the crystalline phase of precursors and calcined powders were examined. The obtained slurry was very stable. The precursor prepared with 0.01 mu m MgO was identified as amorphous. Calcining temperature of 1 000 degree C was enough to make monolithic forsterite powder. With increase in particle size of MgO, however, MgO was distinctly identified in the precursor. Calcination of this precursor at 1 200 degree C did not yield monolithic forsterite powder. MgO remained in the calcined powder. In order to eliminate the remaining MgO, the precursor was ball milled with the planetary milling equipment. It was recognized that such milling was effective to eliminate the MgO and lower the crystallization temperature to forsterite. Key Words:forsterite, fine powder, alkoxide, milling, sinterability