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Vukovic, Nikola
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article
Synthesis of highly porous Al2O3-YAG composite ceramics
Abstract
<jats:p>Al2O3-YAG composite was obtained by sintering of porous Al2O3 preformsinfiltrated with water solution of aluminium nitrate nonahydrate,Al(NO3)3?9H2O and yttrium nitrate hexahydrate, Y(NO3)3?6H2O. Al2O3 preformswith porosity varying from 26 to 50% were obtained after sintering attemperature ranging from 1100 to 1500?C. Sintering of the infiltrated Al2O3preforms led to formation of YAG particles due to reaction between Y2O3 andAl2O3 at high temperature. It was found that variation of porosity of aluminapreforms and sintering temperature is an effective way to fabricate Al2O3-YAGcomposite with an unusual combination of properties. Open porosity was in therange 15-35%, specific surface was 0.6-6.1 m2/g, pore size was 150-900 nmwhereas compressive strength was from 50 to 250 MPa. The effect of sinteringtemperature on YAG formation and phase composition were investigated usingX-ray diffractometry whereas microstructure of the composite was analysed byscanning electron microscopy.</jats:p>