Al2O3-Y2O3 nano- and micro-composite coatings on Fe-9Cr-Mo alloy

被引：9
作者：
Yao Mingming [1 ]
He Yedong
Zhang Ying
Yang Qiuxia
机构：
[1] Jinan Univ, Sch Chem & Chem Engn, Jinan 250022, Peoples R China
[2] Univ Sci & Technol Beijing, Beijing Key Lab Corros Eros & Surface Technol, Beijing 100083, Peoples R China
来源：
JOURNAL OF RARE EARTHS | 2006年 / 24卷 / 05期
基金：
中国国家自然科学基金;
关键词：
sol-gel; nano-/micro-particles; composite coatings; oxidation; rare earths;
D O I：
10.1016/S1002-0721(06)60169-5
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Al2O3-Y2O3 nano- and micro-composite coatings were deposited on Fe-9Cr-Mo substrates by using sol-gel composite coating technology. The processing includes dipping samples in a sol-gel solution dispersed with fine ceramic powders, which are prepared by high-energy ball milling. High-resolution microscopy (FE-SEM) analyses show that the coating is composed of composite particle clusters with an average diameter of 1 mu m, and the coating is relatively dense without cracking during drying and sintering stages. XRD analyses show that the oxide coating is mainly composed of alpha-Al2O3 and gamma-Al2O3. The oxidation tests performed at 600 degrees C in air show that the coatings are provided with much improved resistance against high temperature oxidation and scale spallation. It is indicated that nano-structured composite particles and reactive elements are integrated into the coatings, which plays an important role in preventing agglomeration of nano-particles and initiation of cracks.
引用
收藏
页码：587 / 590
页数：4
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