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The Korean journal of ceramics v.3 no.2, 1997년, pp.116 - 123  

Characterization of Chemically Stabilized $\beta$-cristobalite Synthesized by Solution-Polymerization Route

Lee, Sang-Jin  
  • 초록

    A chemically stabilized $\beta$ -cristobalite, which is stabilized by stuffing cations of $Ca^{2+}$ and $Al^{3+}$ , was prepared by a solution-polymerization route employing Pechini resin or PVA solution as a polymeric carrier. The polymeric carrier affected the crystallization temperature, morphology of calicined powder, and particle size distribution. In case of the polyvinyl alcohol (PVA) solution process, a fine $\beta$ -cristobalite powder with a narrow particle size distribution (average particle size : 0.3 $\mu\textrm{m}$ ) and a BET specific surface area of 72 $\m^2$ /g was prepared by an attrition-milling for 1 h after calcination at 110 $0^{\circ}C$ for 1h. Wider particle size distribution and higher specific surface area were observed for the $\beta$ -cristobalite powder derived from Pechini resin. The cubie(P1-to-tetraganalb) phase transformation in polynystalline $\beta$ -cristobalite was induced at approximately 18 $0^{\circ}C$ . Like other materials showing transformation toughening, a critical size effect controlled the $\beta$ -to- $\alpha$ transformation. Densifed cristobalite sample had some cracks in its internal texture after annealing. The cracks, occurred spontaneoulsy on cooling, were observed in the sample with an average grain sizes of 4.0 $\mu\textrm{m}$ or above. In case of the sintered cristobalite having a composition of CaO. $2Al_2O_3$ .40SiO $_2$ , small amount of amorphous phase and slow grain growth during annealing were observed. Shear stress-induced transformation was also observed in ground specimen. Cristobalite having a composition of CaO.2Al2O3.80SiO2 showed a more sensitive response to shear stress than the CaO. $2Al_2O_3$ .40SiO $_2$ type cristobalite. Shear-induced transformation resulted in an increase of volume about 13% in $\alpha$ -cristobalite phase on annealing for above 10 h in the case of the former composition.


  • 주제어

    ${\beta}$-cristobalite .   Solution-polymerization route .   Critical size effect .   Transformation.  

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