Effect of Glassy Phase Additions to Zirconia on its Sintering Behavior and Microstructure

Abstract:

TZP yttria-stabilized zirconia powder was mixed with two types of glasses as sintering additives: CAS glass and a bioactive glass. These additions were designed toward the material applications as bioceramics. The glassy phase was chosen to promote liquid phase sintering at lower temperature, when compared to pure material. This procedure contributed to reduce the fabrication costs while keeping the material biocompatibility. Each type of glass was added in concentrations of 1, 3, and 5 wt%. The prepared powders were uniaxially pressed at 50 MPa, and then sintered at 1300°C for two hours. The sintering behavior was evaluated by measuring the final sintered densities. It was found that the samples with bioactive glass additions were denser than those with CAS glass. Zirconia TZP powders without glassy additions would not sinter in this temperature. The microstructure of the sintered samples was characterized by SEM and XRD. The sintered ceramics exhibited both submicrometric and uniform grains. The analyzed grain sizes were slightly lower for the samples with CAS additions than for those with bioactive glass additions.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 935-939
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.935
• Online since: August 2012
• Authors: Vera Lúcia Praxedes de Oliveira, Marcelo Henrique Prado da Silva, Eduardo de Sousa Lima, Claudinei dos Santos, Luis Henrique Leme Louro
• Keywords: Glassy Phase, Liquid Phase Sintering (LPS), Zirconia

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DOI: 10.21041/conpat2019/v2pat260

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