In-situ formed γ-Al2O3 nanocrystals repaired and toughened Al2O3 coating prepared by plasma spraying

被引：28
作者：
Yang, Kai [1 ]
Feng, Jingwei [2 ]
Zhou, Xiaming [1 ]
Tao, Shunyan [1 ]
机构：
[1] Chinese Acad Sci, Key Lab Inorgan Coating Mat, Shanghai 200050, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Ceram, Inorgan Mat Anal & Testing Ctr, Shanghai 200050, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2012年 / 206卷 / 13期
基金：
中国博士后科学基金;
关键词：
Plasma spraying; Al2O3; coating; Nanocrystals; In situ formation; Self-toughening; Transmission electron microscopy (TEM); MECHANICAL-PROPERTIES; COMPOSITE COATINGS; CERAMIC COATINGS; MICROSTRUCTURE; BEHAVIOR; ALUMINA; RESISTANCE;
D O I：
10.1016/j.surfcoat.2011.12.014
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
During process of plasma spraying of alumina with the stable a phase in the as-received powder, metastable gamma phase tends to form in the as-deposited coating. In this paper, plasma-sprayed Al2O3 coating was investigated using transmission electron microscopy. In situ formation of gamma-Al2O3 nanocrystals was observed in the pre-existing cracks of the as-sprayed Al2O3 coating, which contributes to self-repairing and self-toughening of the Al2O3 coating. Except for the predominant intergranular fracture, the pre-formed gamma-Al2O3 nanocrystals would effectively obstruct the crack development in the coating and then the coating fracture toughness is enhanced. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：3082 / 3087
页数：6
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