Effects of cathode pulse at high frequency on structure and composition of Al2TiO5 ceramic coatings on Ti alloy by plasma electrolytic oxidation

被引：26

作者：

Yao, Zhongping ^{[1
]}

Liu, Yunfu ^{[1
,2
]}

Xu, Yongjun ^{[1
]}

Jiang, Zhaohua ^{[1
]}

Wang, Fuping ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Chem Engn & Technol, Harbin 150001, Peoples R China

[2] Heilongjiang Inst Sci & Technol, Coll Resources & Environm Engn, Harbin 150027, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2011年 / 126卷 / 1-2期

关键词：

Ceramic coatings; Structure; Cathode pulse; Plasma electrolytic oxidation; Ti alloy; TI-6AL-4V ALLOY; TITANIUM;

D O I：

10.1016/j.matchemphys.2010.11.035

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The aim of this work is to investigate the effects of cathode pulse under high working frequency on structure and composition of ceramic coatings on Ti-6Al-4V alloys by plasma electrolytic oxidation (PEO). Ceramic coatings were prepared on Ti alloy by pulsed bi-polar plasma electrolytic oxidation in NaAlO2 solution. The phase composition, morphology and element distribution in the coating were investigated by X-ray diffractometry, scanning electron microscopy and energy distribution spectroscopy, respectively. The coating was mainly composed of a large amount of Al2TiO5. As the cathode pulse was increased, the amount and grain size of Al2TiO5 were first increased, and then decreased. gamma-Al2O3 in the coating was gradually decreased to nothing with the increase in the cathode pulse whereas rutile TiO2 began to form in the coating. As opposed to the single-polar anode pulse mode, the cathode pulse reduced the thickness of the coatings. However, as the cathode pulse intensity continued to increase, the coating then became thicker regardless of cathode current density or pulse width. In addition, the residual discharging channels were reduced and the density of the coating was increased with the appropriate increase of the cathode pulse. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：227 / 231

页数：5

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