ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 61, (2) 91 - 98 (2017)


PROCESSING OF CONCENTRATED AQUEOUS ZIRCONIA-BIOGLASS SLIPS BY SLIP CASTING
 
León Beltina, Albano María P., Stábile Franco M., Garrido Liliana B.
 
Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), C.C . 49 (B1897ZCA) M. B. Gonnet, Provincia de Buenos Aires, ARGENTINA. Fax 54 (0221) 471-0075.

Keywords: Y-TZP- bioglass suspensions, Zeta potential, Rheological properties, Slip casting
 

3 mol% yttria-partially stabilized zirconia (Y-TZP) powder and a sol-gel derived CaO- P₂O₅- SiO₂ (64S) bioglass, were used to produce Y-TZP- bioglass slip cast compacts. The rheological properties of concentrated aqueous Y-TZP- 64S suspensions prepared with two different glass contents: 10.5 vol% and 19.9 vol%, and ammonium polyacrylate (NH₄PA) as dispersant, were investigated and compared with those of Y-TZP. The density of green cast samples was related to the degree of slip dispersion. The substitution of Y-TZP by 64S glass in the mixtures resulted in greater adsorption of NH₄PA; however, the viscosity and yield stress values of Y-TZP-64S slips were higher than those of Y-TZP ones for the solid loadings studied. The increase in the glass content from 10.5 to 19.9 vol% increased the viscosity and yield stress values. The presence of 64S glass in the mixtures resulted in a less dense packing of cast samples.


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doi: 10.13168/cs.2017.0002
 
 
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