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| Abstract No.: |
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Scheduled at:
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Wednesday, May 11, 2016, Room 3E 4:20 PM
Suspension Spraying III
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| Title: |
Thermal nano-particle spraying to create ceramic layers with nano-composite structures
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| Authors: |
Soshu Kirihara* / Osaka University, Japan
Koki Nonaka / Osaka University, Jaoan
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| Abstract: |
Thermal nanoparticle spraying can create ceramic layers with nanometer sized composite structures. Alumina and zirconia nanoparticles of 200 and 500 nm in average diameter were dispersed into liquid acrylic resins at 20 and 40 % in volume contents. Obtained high viscosity slurries were blown by compressed air jet of 2 atm in pressure as micro mists of 10 ¼m in droplet size. Micro mists were sprayed from twin counter nozzles of 4 mm in inner diameter and injected into argon gas plasma perpendicularly. Micro droplets were collided each other in the plasma flame. The resin component was burned down and nanoparticles were heated and accelerated. On a SUS-304 stainless steel substrate of 50×50×5 mm in size placed at 100 mm in distance from the flame gun top, the zirconia toughened alumina layers of 300 ¼m in thickness were formed at 50 ¼m/s in deposition late. Structural transitions of ceramics composite according to the nanoparticles dispersing ratios in slurry pastes were observed by digital optical and scanning electron microscopes. Vickers hardness of the coated layers was measured to optimize the gas flame spraying conditions. X-ray diffraction spectroscopy was used to analyze the residual carbon elements introduced by imperfect combustions of the liquid resin. The created ceramic layers with the nanocomposite structures will be able to increase abrasion resistance and mechanical property of practical alloy components.
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