The plasma electrolytic oxidation micro-discharge channel model and its microstructure characteristic based on Ti tracer

被引：22
作者：
Gao, Fangyuan [1 ,2 ]
Hao, Li [1 ,2 ]
Li, Guang [1 ,2 ]
Xia, Yuan [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2018年 / 431卷
基金：
对外科技合作项目（国际科技项目）;
关键词：
Plasma electrolytic oxidation; Discharge channel; Schematic model; Ti tracer; ALLOY; PEO; ALUMINUM;
D O I：
10.1016/j.apsusc.2017.07.281
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This study focuses on the individual discharge channel of ceramic coating prepared by plasma electrolytic oxidation (PEO), and attempts to reveal the mechanism of breakdown discharge at low voltage. Titanium (Ti) was employed as a substrate with the layer of aluminum deposited on it (aluminized Ti). The shape and microstructure of the discharge channels in PEO coatings were investigated using transmission electron microscope (TEM) and scanning electron microscopy (SEM). A schematic model of the individual discharge channel was proposed based on Ti tracer method. The shape of the discharge channel was mainly cylinder-shaped in the compact coating, with a groove-like oxidation region existed at the coating/substrate interface. In the groove-like oxidation region, the phase composition mainly composed of amorphous and mixed polycrystalline (aluminum titanate and mullite). beta-Al2O3 was found in the ceramic coating. TEM morphology showed that nanometer sized micro channels existed in the ceramic coatings. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：13 / 16
页数：4
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