Presentation Title

Autopolishing Yttria-Stabilized Zirconia with Diamond

Start Date

November 2016

End Date

November 2016

Location

HUB 302-#43

Type of Presentation

Poster

Abstract

Light propagation through a transparent material is hindered by randomly roughened surfaces, which cause light to reflect and scatter at many different angles, thereby reducing transparency. For example, applying optical diagnostic and therapeutic procedures through transparent Window to the Brain (WttB) cranial implants made from nanocrystalline yttria-stabilized-zirconia (nc-YSZ) will requirea fine surface polish to reduce energy loss through scattering by roughened surfaces. Polishing hard transparent materials such as nc-YSZ manually is time consuming and gives variable results. The objective of this work was to develop a high-throughput and highly reproducible protocol to polish nc-YSZ samples for optical experiments. To achieve this, we investigated automatic polishing with silicon carbide and various diamond slurries. Polishing with silicon carbide led to pullouts and unresolved defects, while polishing with diamond slurries of various sizes did not. For diamond, our protocol included four steps with variable times depending on each sample’s needs: 1) 30-micron diamond for 1-7 minutes; 2) 6-micron diamond with 0.2-micron colloidal silica for 7-9 minutes; 3) 1-micron diamond for 7-9 minutes; 4) 0.2-micron colloidal silica for 7-9 minutes. The protocol we developed gives excellent results for both 6mol%YSZ and 8mol%YSZ samples, and also works on whole and fractured samples. Further work is underway to adapt our protocol for polishing 3mol%YSZ, and for polishing the orthogonal edge after cutting nc-YSZ samples to different geometries with a diamond saw.

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

Autopolishing Yttria-Stabilized Zirconia with Diamond

HUB 302-#43

Light propagation through a transparent material is hindered by randomly roughened surfaces, which cause light to reflect and scatter at many different angles, thereby reducing transparency. For example, applying optical diagnostic and therapeutic procedures through transparent Window to the Brain (WttB) cranial implants made from nanocrystalline yttria-stabilized-zirconia (nc-YSZ) will requirea fine surface polish to reduce energy loss through scattering by roughened surfaces. Polishing hard transparent materials such as nc-YSZ manually is time consuming and gives variable results. The objective of this work was to develop a high-throughput and highly reproducible protocol to polish nc-YSZ samples for optical experiments. To achieve this, we investigated automatic polishing with silicon carbide and various diamond slurries. Polishing with silicon carbide led to pullouts and unresolved defects, while polishing with diamond slurries of various sizes did not. For diamond, our protocol included four steps with variable times depending on each sample’s needs: 1) 30-micron diamond for 1-7 minutes; 2) 6-micron diamond with 0.2-micron colloidal silica for 7-9 minutes; 3) 1-micron diamond for 7-9 minutes; 4) 0.2-micron colloidal silica for 7-9 minutes. The protocol we developed gives excellent results for both 6mol%YSZ and 8mol%YSZ samples, and also works on whole and fractured samples. Further work is underway to adapt our protocol for polishing 3mol%YSZ, and for polishing the orthogonal edge after cutting nc-YSZ samples to different geometries with a diamond saw.