Presentation Title

Low Temperature Degradation of Yttria-Stabilized-Zirconia

Start Date

November 2016

End Date

November 2016

Location

HUB 302-#56

Type of Presentation

Poster

Abstract

Zirconia ceramics are high performance materials with excellent mechanical properties. The properties of interest is it’s ability to exhibit transformation toughening, biocompatibility, and in some cases, transparency. The transparency of the Yttria-Stabilized-Zirconia (YSZ) used in our study allows visibility whilst maintaining hardness, making it a prime material for use in cranial implantation. The use of transparent YSZ as a cranial implant would allow for direct visibility of the brain as well as direct therapy through laser radiation, which could be conducted without multiple craniotomies. However, Low-Temperature aging affects the transparency of the implant. This is due to microstructure crystalline transformation caused by water infiltration through the surface of the material, causing the material to shift from cubic to monoclinic phase, and this shift to monoclinic phase negatively impacts the mechanical and optical properties of the YSZ. In this study, YSZ will be aged in a steam bath at 134 degrees Celsius under a pressure valve under 2 bar. After aging simulation, the transformation is evaluated using X-ray diffraction (XRD). The results show 1% transformation in 6% mole YSZ and no change in 8% YSZ. The transparency of the 6% YSZ after aging decreased by 7% in average and 8% YSZZ transparency is not changed. The volumetric expansion of the material due to this transformation results in micro-cracks at the surface, resulting in a decrease of transparency. Further tests and research would analyze the monoclinic content of two different molar qualities of YSZ after 32 hours of aging, mimicking the level of degradation that would theoretically happen inside of the human skull.

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Nov 12th, 4:00 PM Nov 12th, 5:00 PM

Low Temperature Degradation of Yttria-Stabilized-Zirconia

HUB 302-#56

Zirconia ceramics are high performance materials with excellent mechanical properties. The properties of interest is it’s ability to exhibit transformation toughening, biocompatibility, and in some cases, transparency. The transparency of the Yttria-Stabilized-Zirconia (YSZ) used in our study allows visibility whilst maintaining hardness, making it a prime material for use in cranial implantation. The use of transparent YSZ as a cranial implant would allow for direct visibility of the brain as well as direct therapy through laser radiation, which could be conducted without multiple craniotomies. However, Low-Temperature aging affects the transparency of the implant. This is due to microstructure crystalline transformation caused by water infiltration through the surface of the material, causing the material to shift from cubic to monoclinic phase, and this shift to monoclinic phase negatively impacts the mechanical and optical properties of the YSZ. In this study, YSZ will be aged in a steam bath at 134 degrees Celsius under a pressure valve under 2 bar. After aging simulation, the transformation is evaluated using X-ray diffraction (XRD). The results show 1% transformation in 6% mole YSZ and no change in 8% YSZ. The transparency of the 6% YSZ after aging decreased by 7% in average and 8% YSZZ transparency is not changed. The volumetric expansion of the material due to this transformation results in micro-cracks at the surface, resulting in a decrease of transparency. Further tests and research would analyze the monoclinic content of two different molar qualities of YSZ after 32 hours of aging, mimicking the level of degradation that would theoretically happen inside of the human skull.