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Gas Turbines: Structures and Dynamics

Tribological Behaviors of Titanium Nitride- and Chromium-Nitride-Based Physical Vapor Deposition Coating Systems

[+] Author and Article Information
Feng Cai1

 Mechanical and Aerospace Engineering, Carleton University, Ottawa, ON K1S 5B6, Canadafcai@connect.carleton.ca

Xiao Huang

 Mechanical and Aerospace Engineering, Carleton University, Ottawa, ON K1S 5B6, Canadaxhuang@mae.carleton.ca

Qi Yang

 Institute for Aerospace Research, National Research Council Canada, Ottawa, ON K1A 0R6, CanadaQi.Yang@nrc-cnrc.gc.ca

Doug Nagy

 Liburdi Engineering, Dundas, ON L9H 7K4, Canadadnagy@liburdi.com

1

Corresponding author.

J. Eng. Gas Turbines Power 134(11), 112504 (Oct 01, 2012) (8 pages) doi:10.1115/1.4007168 History: Received June 24, 2012; Revised July 05, 2012; Published October 01, 2012; Online October 01, 2012

This study investigates the effects of the deposition process and coating composition on microstructural and tribological properties of TiN- and CrN-based coating systems. Coatings were produced using various PVD-based processes—electron beam (EB), cathodic arc (CA), and plasma enhanced magnetron sputtering (PEMS). All coated samples were evaluated for their composition, microstructure, and surface morphology. Coating mechanical properties such as hardness, Young’s modulus, and coefficient of friction were also studied and related to their microstructures, wear, and erosion resistances. It was found that hardness (H), Young’s modulus (E), and coefficient of friction had impact on both wear and erosion rates. In particular, the H3 /E2 ratio was inversely proportional to the specific wear rate. For erosion behavior, higher H3 /E2 ratios relate to lower erosion rates at low impingement angles, whereas higher H3 /E2 ratios relate to higher erosion rates at high impingement angles.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

SEM image of Al2 O3 abrasive

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Figure 2

SEM images of the as-deposited TiN coatings

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Figure 3

SEM images of the as-deposited CrN-based coatings

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Figure 4

XRD patterns for CrN-based coatings

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Figure 5

Hardness and Young’s modulus versus Si content in CrN-based coating systems

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Figure 6

Wear behavior versus Si content in CrN-based coating systems. (a) Specific wear rate and COF. (b) Specific wear rate and H3 /E2 .

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Figure 7

Erosion behaviors of test coating systems. (a) Erosion behaviors of TiN and CrN coatings. (b) Erosion behaviors versus Si content in CrN-based coating systems.

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