Effects of binder and compression strength on molding parameters of dental ceramic blocks


Uz M. M. , Karakaş Aydınoğlu A. , Hazar A. B.

CERAMICS INTERNATIONAL, vol.46, no.8, pp.10186-10193, 2020 (Journal Indexed in SCI Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 8
  • Publication Date: 2020
  • Doi Number: 10.1016/j.ceramint.2020.01.010
  • Title of Journal : CERAMICS INTERNATIONAL
  • Page Numbers: pp.10186-10193

Abstract

Abstract

    Yttria-stabilized dental zirconia ceramic powders were synthesized by chemical precipitation method and then sintered at 1350°C. 3 wt% and 5 wt% PVA were added as a binder. Chemical, phasic, thermogravimetric, and differential thermal and grain size, as well as distribution analyses were performed on synthesized and commercial dental ceramic powders. The synthesized and commercial samples containing different binder ratios were molded using different cold isostatic presses (200, 300, and 400 MPa). Final sintering was performed at 1450°C for 2 h. Density, microhardness, and fracture toughness analyses were performed on all the block samples. In addition, the fracture behavior of sintered blocks was evaluated by electron microscopy. The results showed that the molding force of 400 MPa with 3% binder content was sufficient to achieve the desired mechanical value, and this sample had 6.02 g/cm3 density, 10.44 GPa hardness, and 6.34 MPa m1/2 fracture toughness. As the molding force increased, the density and mechanical values of the synthesized powder also increased, yet no marginal changes were observed in the commercial sample.

    Abstract

      Yttria-stabilized dental zirconia ceramic powders were synthesized by chemical precipitation method and then sintered at 1350°C. 3 wt% and 5 wt% PVA were added as a binder. Chemical, phasic, thermogravimetric, and differential thermal and grain size, as well as distribution analyses were performed on synthesized and commercial dental ceramic powders. The synthesized and commercial samples containing different binder ratios were molded using different cold isostatic presses (200, 300, and 400 MPa). Final sintering was performed at 1450°C for 2 h. Density, microhardness, and fracture toughness analyses were performed on all the block samples. In addition, the fracture behavior of sintered blocks was evaluated by electron microscopy. The results showed that the molding force of 400 MPa with 3% binder content was sufficient to achieve the desired mechanical value, and this sample had 6.02 g/cm3 density, 10.44 GPa hardness, and 6.34 MPa m1/2 fracture toughness. As the molding force increased, the density and mechanical values of the synthesized powder also increased, yet no marginal changes were observed in the commercial sample.