DBPapers
DOI: 10.5593/sgem2012/s12.v3010

THE INFLUENCE OF INFILTRATION PARAMETERS ON MULLITE MATRIX COMPOSITES

S. STOLERIU, C. NETOIU, A. CARABAT, E. ANDRONESCU
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 3, 507 - 514 pp

ABSTRACT

The properties of mullite ceramics can be improved by the addition of partially
stabilized zirconia particles. Thus, the zirconia toughened mullite composites, obtained
by infiltration technique, were studied.
The ceramic composites were obtained by infiltration of chlorides mixture solution
(ZrCl4 and YCl3) into partially sintered ceramic bodies. The chlorides solution was
corresponding to tetragonal stabilized zirconia (4% Y2O3).
The mullite porous ceramic bodies were realized from nanopowder obtained through
precipitation route. The nanopowder was characterized by specific techniques such as:
X ray diffraction, transmission electronic microscopy, thermal analysis. From calcined
powder there were obtained, by uniaxial pressing, compact green bodies. The green
compacts were thermally treated between 1000° and 1200°C, with a soaking time of 2
hours.
The parameters which affect the infiltration process were taking into consideration (i.e.
infiltration time, infiltration negative pressure). After immersion the bodies were dried,
calcined and sintered at 1500°C.
The relative density of sintered bodies was higher than 85% and was achieved for all
conditions of the final thermal treatment. The microstructure and phase composition of
the sintered composite ceramics was evaluated through scanning electron microscopy
and X-ray diffraction analysis. The compressive strength was measured and
corresponding Young’s modulus of the ceramic composites calculated.

Keywords: composite, mullite, zirconia, infiltration