Microstructure of alumina-3wt.% titania coatings by plasma spraying with nanostructured powders

被引：57
作者：
Lin, XH [1 ]
Zeng, Y [1 ]
Zhou, XM [1 ]
Ding, CX [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2003年 / 357卷 / 1-2期
关键词：
Al2O3-TiO coatings; bimodal microstructure; plasma spray; nanostructured;
D O I：
10.1016/S0921-5093(03)00164-3
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructure of plasma-sprayed alumina-3wt.% titania coatings with the nanostructured powders was investigated by Xray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the nanostructured coating exhibited a bimodal microstructure: splat lamellae similar to the conventional coating and equiaxed grains originating from the starting feedstock. The splat lamellae consisted of gamma-Al2O3 grains and most of them were less than 200 nm in diameter. Equiaxed grains took the modification of alpha-Al2O3 and ranged from 150 to 800 nm in size. In addition, the modifications of TiO2 disappeared and Ti element was dissolved in gamma-Al2O3 grains. The bimodal microstructure contributed to the improvement in mechanical properties of the nanostructured coating. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：228 / 234
页数：7
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