Table of Contents
Conference Papers in Science
Volume 2015, Article ID 873543, 9 pages
http://dx.doi.org/10.1155/2015/873543
Conference Paper

Investigation of the Wear Resistance Properties of Cr/CrN Multilayer Coatings against Sand Erosion

Chair of Materials and Physical Metallurgy, Brandenburg Technical University, Konrad Wachsmann Allee 17, 03046 Cottbus, Germany

Received 1 August 2014; Accepted 30 September 2014

Academic Editor: Martin Dienwiebel

This Conference Paper is based on a presentation given by Muhammad Naveed at “European Symposium on Friction, Wear, and Wear Protection” held from 6 May 2014 to 8 May 2014 in Karlsruhe, Germany.

Copyright © 2015 Muhammad Naveed et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The wear of metallic components used in gas and steam turbines due to erosive sand particles leads to a tremendous decrease in their lifetime. This wear can be reduced by the use of suitable erosion resistant coatings resulting in lower maintenance costs. In this context, multilayer Cr/CrN PVD coatings using an industrial coater were designed and applied on Inconel 718, a material which finds its application in gas turbines. A variation in the bimodal period has been induced in order to achieve an optimal coating architecture providing optimum properties needed for the erosion resistant coatings. The coating was deposited using a single Cr-target with an induction of N2 during the nitriding phase at a temperature of 480–500°C and the coating thickness of 24–26 μm was kept constant throughout. The erosion tests were conducted at angles of 30°, 60°, and 90°. The sand used for the test is an irregular shaped SiO2. The erosion tests were followed by a detailed microscopic examination of the eroded coating structure in combination with nanoindentation and scratch tests.