Microstructural characteristics and formation mechanism of Al2O3-13 wt.% TiO2 coatings plasma-sprayed with nanostructured agglomerated powders

被引：58

作者：

Wang, Dongsheng ^{[1
]}

Tian, Zongjun ^{[1
]}

Shen, Lida ^{[1
]}

Liu, Zhidong ^{[1
]}

Huang, Yinhui ^{[1
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mech & Elect Engn, 29 Yudao St, Nanjing 210016, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2009年 / 203卷 / 10-11期

基金：

中国国家自然科学基金;

关键词：

Plasma spraying; Nanostructured agglomerated powders; Al2O3-13 wt.% TiO2 coatings; Microstructure; Formation mechanism; PARTIALLY-STABILIZED ZIRCONIA; ALUMINA/TITANIA COATINGS; NANOCRYSTALLINE POWDERS; TITANIA COATINGS; WEAR; BEHAVIOR; CERAMICS; MICROHARDNESS; SIMULATION; DEPOSITION;

D O I：

10.1016/j.surfcoat.2008.10.027

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanostructured Al2O3-13 wt.% TiO2 coatings were prepared by plasma spraying with agglomerated powders. The microstructural characteristics of the feedstock and the coating were investigated by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometry (XRD). Moreover, the microstructural formation mechanism of the coating was analyzed. The results show that the ceramic coating consists of both fully melted regions and partially melted regions, and the fully melted region has a lamellar-like structure as the conventional coating. In terms of microstructures, the partially melted regions can be divided into liquid-phase sintered regions (a three-dimensional net or skeleton-like structure: Al2O3-rich submicron particles embedded in the TiO2-rich matrix) and solid-phase sintered regions (remained nano-particles). The fully melted region, liquid-phase sintered region and solid-phase sintered region of the coating derive from the region of the feedstock, where the corresponding temperature during plasma spraying is beyond 2045 degrees C (melting point of Al2O3), between 1840 degrees C (melting point of TiO2) and 2045 degrees C and below 1840 degrees C, respectively. The formation of the solid-phase and liquid-phase sintered regions in the partially melted region is attributed to the melting point difference of Al2O3 and TiO2. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：1298 / 1303

页数：6

共 35 条

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