Effect of Glassy Phase Additions to Zirconia on its Mechanical Properties

Abstract:

Glasses with two different compositions were added to yttria-stabilized zirconia TZP powder: a CAS glass and a bioactive glass. These additions allowed liquid phase sintering to occur at temperature as low as 1300 °C. The concentrations of each glass additions were of 1, 3, and 5 wt%. The prepared compositions were uniaxially pressed at 50 MPa and sintered at 1300oC for 2 hours. The sintered samples were characterized for their mechanical properties, by measuring four-point bending mechanical strength, Vickers microhardnesses, and fracture toughness ( K_Ic ). Vickers microhardness measured values ranged from 10 to 12 GPa, while fracture toughness, from 3.8 to 4.4 MPa.m^1/2. The flexural mechanical strength was situated between 302 and 408 MPa. The achieved mechanical properties, from sintered samples were possible due to glassy phase additions. These properties, associated to biocompatibility, enable such materials to be used in different applications, including bioceramics.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 940-944
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.940
• 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, Mechanical Property, Zirconia

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