|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||068 Thermoplastic Extrusion of YAG Tubes
||Nathan Taylor, Richard M. Laine
|On-Site Speaker (Planned)
Liquid feed-flame spray pyrolysis (LF-FSP) combusts alcohol solutions of metalloorganics, producing unaggregated single and mixed-metal oxide nanopowders. We find that blends of these powders with ethylene vinyl acetate binder can be extruded to form 0.7 mm thick x 10 mm diameter x 70 cm long free standing composite tubes containing 50 vol % YAG composition that following burnout sinter to >95 %TD. Our goal is to produce optically transparent tubes for light transmission applications. Green densities following burnout were 45 %TD. We find reactive sintering of 3 Al<sub>2</sub>O<sub>3</sub>:5 Y<sub>2</sub>O<sub>3</sub> produced >96 %TD using two-step sintering with a peak temperature of 1500°C/0 h and 1300 °C/20 h in vacuum. Final grain sizes were 1 to 2 µm. Alternately, tubes made with YAG composition nanopowders sintered to > 95 %TD only at 1600°C/3 h, with final grain sizes of 3 to 5 µm.