Sol-gel alumina coatings on stainless steel for wear protection

被引：42

作者：

Huebert, Thomas ^{[1
]}

Schwarz, Jack

Oertel, Bernd

机构：

[1] Fed Inst Mat Res & Testing, BAM, D-12200 Berlin, Germany

[2] Univ Appl Sci Schmalkalden, D-98574 Schmalkalden, Germany

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2006年 / 38卷 / 02期

关键词：

alumina; sol-gel; coating; wear protection; residual stress;

D O I：

10.1007/s10971-006-6470-7

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The aluminium oxide films on austenitic steel are prepared from sols of re-dispersed boehmite nano powders in water. After dip-coating of the sol, a heat treatment including drying, calcination and annealing in vacuum at temperatures up to 1100 degrees C is performed to obtain crack-free coatings of a thickness up to 6 mu m. XRD measurements detect alpha- and gamma-alumina, a TiOx-phase at the metal/coating interface and a gradient of phase formation in the coating. The strong adhesion on the substrates is due to the layered assembly and gradient composition of the coating caused by an inter-diffusion of metal cations and oxygen in the metal/oxide interface during heat treatment. Residual stress measurements by X-rays result in compressive stresses of 2-4 GPa in the alumina coatings. The pin-on-disc test shows a remarkable improvement of wear resistance obtained by sol-gel coatings. The alpha-alumina content and the compressive stress of the coatings correlate with wear resistance of the coatings.

引用

页码：179 / 184

页数：6

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