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    STUDIA CHEMIA - Issue no. 1-2 / 2001  
         
  Article:   PORE STRUCTURE STABILITY OF ALUMINA BASED MEMBRANES.

Authors:  LIVIU LITERAT, LUCIA GAGEA.
 
       
         
  Abstract:  Certain sintering agent decrease the alumina membranes burning temperature and the other maintain the porosity parameters at stable values, even we increase the burning temperature. The membranes were prepared from industrial alumina powder, -Al(OH)3 (Alor-Oradea). The thermally pre-treated powders and the sintering agents, like TiO2 anatas, Cr2O3, La2O3 and ceramic binder (Zettlitz kaolin), were mixed in porcelain ball mill for several hours. Before the final thermal treatment, the ball milling powder was compacted by pressing in disks of 30 mm, at 342 daN/cm2. The starting materials and the porous ceramics resulted from thermal treatments, were studied by the following methods: X-ray diffraction working with Curadiation, DTA/TG analysis, between 20 and 1000░C, with a rate of 10░C/minute, optical microscopy and Hg porosimetry.  
         
     
         
         
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