Synthesis of aluminum oxide coating with carbon nanotube reinforcement produced by chemical vapor deposition for improved fracture and wear resistance
Abbreviated Journal Title
MECHANICAL-PROPERTIES; CERAMIC-MATRIX; TRIBOLOGICAL BEHAVIOR; CNT; COMPOSITES; NANOCOMPOSITE; HETEROCOAGULATION; POLYMER; SINGLE; Chemistry, Physical; Materials Science, Multidisciplinary
Chemical vapor deposition (CVD) was used to achieve a homogeneous dispersion of carbon nanotubes (CNTs) on aluminum oxide (Al(2)O(3)) powder. This powder was plasma sprayed onto a steel substrate to produce a 96% dense Al(2)O(3) coating with CNT reinforcement. Addition of 1.5 wt.% CNTs showed a 24% increase in the relative fracture toughness of the composite coating. The improvement in the fracture toughness is attributed to uniform dispersion of CNTs and toughening mechanism such as CNT bridging, crack deflection and strong interaction between CNT/Al(2)O(3) interfaces. Wear and friction behavior of the CNT reinforced Al(2)O(3) coating under dry sliding condition was investigated by ball-on-disk tribometer. With the increasing normal loads from 10 to 50 N, the wear volume loss and coefficient of friction of the coating increased, owing to transition from the mild to severe wear. Wear resistance of the Al(2)O(3)-CNT composite coating improved by similar to 27% at 50 N. Coefficient of friction at 50 N was dependent on the competing phenomena of wear debris generation and graphitization due to pressure. (C) 2009 Elsevier Ltd. All rights reserved.
"Synthesis of aluminum oxide coating with carbon nanotube reinforcement produced by chemical vapor deposition for improved fracture and wear resistance" (2010). Faculty Bibliography 2010s. 349.