Surface Enhancement of Al2O3 Fiber With Nanosized Al2O3 Particles Using A Dry Mechanical Coating Process

[+] Author and Article Information
Nowarat Coowanitwong, Chang-Yu Wu

University of Florida, Dept. Environmental Engineering Sciences, Gainesville, FL 32611

Judy Nguyen

University of Florida, Department of Chemical Engineering, Gainesville, FL 32611

Mei Cai, Martin Ruthkosky, Jerry Rogers, Lee Feng

General Motors, Research & Development Center, Warren, MI 48090

Satoru Watano

Osaka Prefecture University, Department of Chemical Engineering, Osaka, 599, Japan

Taizo Yoshida

Tokuju Corporation, Kanagawa, 254, Japan

J. Eng. Mater. Technol 125(2), 163-169 (Apr 04, 2003) (7 pages) doi:10.1115/1.1555655 History: Received March 18, 2002; Revised November 22, 2002; Online April 04, 2003
Copyright © 2003 by ASME
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Mechanism of the dry mechanical particle coating process
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SEM images of (a) unprocessed raw Al2O3 fiber and (b) processed Al2O3 fiber at 75/2500 rpm for 30 mins
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Fiber length of Al2O3 fiber as a function of rotor speed (vessel speed: 75 rpm, 30 mins processing time)
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Equivalent diameter of Al2O3 fiber as a function of processing time (vessel speed: 75 rpm, rotor speed: 500 and 2000 rpm)
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Product equivalent diameter as a function of initial loading of Al2O3 nanoparticles (75/2000 rpm for 30 mins)
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(a) Product surface area as a function of initial loading of Al2O3 nanoparticles (75/2000 rpm for 30 mins); (b) coating effectiveness as a function of initial Al2O3 nanoparticle loading (75/2000 rpm for 30 mins); and (c) coating efficiency as a function of initial Al2O3 nanoparticle loading (75/2000 rpm for 30 mins)
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SEM images of Al2O3 coated with various loading at 75/2000 rpm for 30 mins: (a)–(b) 2%, (c)–(d) 10%, (e)–(f) 20%, and (g)–(h) 20% for 240 mins
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Zeta Potential, at pH=7, as a function of initial loading of Al2O3 nanoparticles (75/2000 rpm for 30 mins)
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Conceptual coating process (t1<t2<t3,t=processing time)
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XRD Patterns (a) Raw Al2O3 fiber, (b) γ-Al2O3 nanoparticles (* ), (c) 10% Al2O3 coated on Al2O3 fiber, 75/2000 rpm, 30 mins, and (d) 20% Al2O3 coated on Al2O3 fiber, 75/2000 rpm, 240 mins
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Durability test of 10% Al2O3 coated on Al2O3 fiber, 75/2000 rpm for 30 mins
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SEM images of 10% Al2O3 coated fiber after fluidization for (a) 3 mins and (b) 1 week




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