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

被引：93

作者：

Balani, K. ^{[1
]}

Zhang, T. ^{[2
]}

Karakoti, A. ^{[3
,4
]}

Li, W. Z. ^{[2
]}

Seal, S. ^{[3
,4
]}

Agarwal, A. ^{[1
]}

机构：

[1] Florida Int Univ, Dept Mech & Mat Engn, Miami, FL 33174 USA

[2] Florida Int Univ, Dept Phys, Miami, FL 33174 USA

[3] Univ Cent Florida, Nanosci & Technol Ctr, AMPAC, Orlando, FL 32816 USA

[4] Univ Cent Florida, Nanosci & Technol Ctr, MMAE, Orlando, FL 32816 USA

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 03期

基金：

美国国家科学基金会;

关键词：

plasma spraying; chemical vapor deposition (CVD); transmission electron microscopy (TEM); toughness; nanocrystalline materials;

D O I：

10.1016/j.actamat.2007.10.038

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：571 / 579

页数：9

共 34 条

[31] Direct observation of toughening mechanisms in carbon nanotube ceramic matrix composites [J].