Spherical fine zirconia (ZrO2) and 9 mol % magnesia doped zirconia (MgO-ZrO2) ceramic powders (diameter of similar to 0.2 mm) have been synthesized from a hydrothermally treated sol of zirconium and magnesium salts by spray pyrolysis. The results revealed that synthesized powders can be sintered into uniformly sized fine grained ceramic of > 97% theoretical density at temperature as low as 1100 degrees C. The phases, purity, crystallite size, agglomeration structure, particle size, specific surface area, pore size distribution and porosity of ZrO2 and MgO-ZrO2 ceramics were measured by XRD, SEM, N-2-gas adsorption and Hg-diffusion techniques. The results of X-ray diffraction and scanning electron microscopy showed that the ZrO2 and MgO-ZrO2 remained amorphous up to 700 degrees C, but on increasing the heat treatment temperature to around 1200 degrees C for 8 hrs. monoclinic crystals were obtained. Thermogravimetric (TG) and differential scanning calorimetric (DSC) techniques were used to measure the burnout temperatures and enthalpy (Delta H) of polyvinyl alcohol (PVA) and methylcellulose (MC) polymers used as binders. Burnout of these polymers is 100% in an oxidizing atmosphere; 90% burnout was achieved in an inert atmosphere.
K A SHAHID ,JAVED AKHTAR ,N A CHUGHTAI ,SHAHID KHAN DURRANI ,
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