A Route to Prepare Magnesium Oxide Fiber

MgO fiber were prepared by MgCl2·6H2O and NH3·H2O as low-cost sources through pseudomorph technique. At first, very pure Mg2(OH)3Cl-3H2O with perfect crystallized fiber-like crystal morphology was obtained, then a method of multi-steps sintering was used for controlling the conditions of low temperature decomposition of Mg2(OH)3Cl·3H2O, and keeping the decomposition product MgO in its original crystal morphology, and for sintering the nano MgO grains at high temperature to MgO fiber. SEM and XRD results show that the MgO fiber is pseudomorphic, and has a diameter from 0.3μm to 1.2μm a length more than 50μm. The best decomposition temperature is 873K, and the best sintering temperature 1273K.