Title

In situ carbon nanotube reinforcements in a plasma-sprayed aluminum oxide nanocomposite coating

Authors

Authors

K. Balani; T. Zhang; A. Karakoti; W. Z. Li; S. Seal;A. Agarwal

Comments

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Abbreviated Journal Title

Acta Mater.

Keywords

plasma spraying; chemical vapor deposition (CVD); transmission electron; microscopy (TEM); toughness; nanocrystalline materials; CERAMIC-MATRIX NANOCOMPOSITES; MECHANICAL-PROPERTIES; COMPOSITES; TEMPERATURE; FABRICATION; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

Abstract

Carbon nanotubes (CNT) are potential reinforcements for toughening the ceramic matrix. The critical issue of avoiding CNT agglomeration and introducing CNT-matrix anchoring has challenged many researchers to improve the mechanical propel-ties of the CNT reinforced nanocomposite. In the current work, dispersed CNTs are grown on Al2O3 powder particles in situ by the catalytic chemical vapor deposition (CCVD) technique. Consequently, 0.5 wt.% CNT-reinforced Al2O3 particles were successfully plasma sprayed to obtain a 400 mu m thick coating on the steel substrate. In situ CNTs grown on Al2O3 shows a promising enhancement in hardness and fracture toughness of the plasma-sprayed coating attributed to the existence of strong metallurgical bonding between Al2O3 particles and CNTs. In addition, CNT tentacles have imparted multi-directional reinforcement in securing the Al2O3 splats. High-resolution transmission electron microscopy shows interfacial fusion between Al2O3 and CNT and the formation of Y-junction nanotubes. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Journal Title

Acta Materialia

Volume

56

Issue/Number

3

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

571

Last Page

579

WOS Identifier

WOS:000253020900028

ISSN

1359-6454

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