Mullite-zirconia ceramics were explored by different prepared powders. Conventional and hydrothemal treatment methods of starting components, characteristics of synthesised powders and their influence on sintering rates, phase composition and properties of mullite-zirconia ceramics were studied and compared. Compositions of Al₂O_{3 (gamma)},SiO₂.nH₂O, ZrO₂ mon. and Y₂O₃ for conventional and of Al(NO₃).9H₂O, SiO₂-aeroc, ZrOO(NO₃).2H₂O and Y(NO₃).6H₂O for hydrothermal preparing of starting powders were used to fulfil the mullite stoichiometric composition. The pressed samples were sintered at temperatures from 1000 to 1500⁰C. The effect of hydrothermal preparing process on grain size (average 50-150nm) of sintered samples is emphasized.

It is shown that densification is largely affected by milling time by conventional, as well hydrothermal preparing. XRD and SEM examinations showed the differences in mullite and ZrO₂ (tetr.) crystalline phases formed starting from 1300⁰C from conventional powders. In comparision with previously mentioned samples from hydrothermally prepared powders had a higher tendency to form a mullite phase, starting already from 1000⁰C.

Bending strenght and pressure resistance measurements for samples from conventionally prepared powders showed that these values are remarkably influenced by milling time - for the maximum time (24h) the pressure resistance for at 1400⁰C sintered samples reached 280-300 MPa, bending strenght - 70-75 MPa.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/15521 must be provided.

1. Comparison of RE ion luminescence in zirconia nanocrystals and Single crystals
2. Fast luminescence in ZnO structures
3. Spectroscopic studies of magnon excitations in nanosized NiO
4. Concentration dependence of Ni²⁺ luminescence in MgO
5. Preparation of Silicon Carbide/Nitride Nanocomposites with Oxides or Nitrides