Abstract No.:
3661

 Scheduled at:
Friday, May 23, 2014, Hall A 1:40 PM
Suspension Spraying 2


 Title:
Nano-particles slurry injection into plasma spraying for speedy layer forming of zirconia toughed alumina

 Authors:
Soshu Kirihara* / Osaka University, Japan

 Abstract:
Thermal nanoparticles spraying technique was newly developed to create fine ceramics layers with nanometer sized composite microstructures. Resin slurry including with ceramics nanoparticles were atomized by compressed air jet in a chamber, and the formed micro mists of composited droplets were injected effectively from a tubular nozzle into plasma flare. In this investigation, the alumina and zirconia particles of 200 nm in average diameters were dispersed into the acrylic liquid resin at 40 % in total volume ratio to fabricate the composite nanostructures with the higher fracture toughness. The micro sized mists of 20 ¼m in average droplet diameter were formed through the compressed air jet of 2 atm in gas pressure, and introduced into the into the arc plasma with an argon gas spray of 50 slpm in flow late through the stainless still guide nozzle of 4 mm in caliber size. The zirconia toughed alumina coated layer of 300 ¼m in thickness was formed successfully on the SUS-304 stainless steel substrate of 50×50×5 mm in size placed at 100 mm in distance from the plasma gun. The higher speed coating of 50 ¼m/s in deposition late was realized. Crystal phases of the coated layer were analyzed by using X-ray diffraction method, and cross sectional microstructures and compositional distributions were observed by using an optical and scanning electron microscopy. Porosities of coated layers were measured through dielectric constant measurements by using a terahertz wave spectroscopy.

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