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  Estonian Journal of Engineering

ISSN 1736-7522 (electronic)  ISSN 1736-6038  (print)

 An international scientific journal
Formerly: Proceedings of the Estonian Academy of Sciences Engineering
(ISSN 1406-0175)
Published since 1995

Estonian Journal of Engineering

ISSN 1736-7522 (electronic)  ISSN 1736-6038  (print)

 An international scientific journal
Formerly: Proceedings of the Estonian Academy of Sciences Engineering
(ISSN 1406-0175)
Published since 1995

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Mechanical properties of thin hard coatings on TiC-NiMo substrates; pp. 329–339

(Full article in PDF format) doi: 10.3176/eng.2009.4.10


Authors

Can Emrah Yaldiz, Renno Veinthal, Andre Gregor, Kyriakos Georgiadis

Abstract

The present study focuses on TiC-based composites with Ni-Mo binders and thin coatings (TiN, (Ti,Al)N, TiCN, nc-(Al,Ti)N/α-Si3N4), produced by the Physical Vapor Deposition technique. The influence of two different Ni : Mo binder ratios (2 : 1 and 1 : 1) on the properties of the substrate and coating systems was evaluated. The effect of the substrate surface roughness on the overall substrate/coating system was also investigated. Nanocomposite nACo® coatings showed the highest hardness value. In addition, these coatings also have lower modulus values, which makes them the best candidate for wear-resistant applications. TiCN coatings have the second highest hardness value, but due to poor adhesion qualities, especially at higher roughness values, delamination was found to be present even directly after the coating process without any load. This is assumed to be related to the higher inherent residual stresses of TiCN coatings with TiC NiMo cermets.

Keywords

TiC-NiMo cermet, PVD coating, nanoindentation, surface roughness.

References

1. Kübarsepp , J. , Klaasen , H. and Pirso , J. Behaviour of TiC-base cermets in different wear conditions. Wear , 2001 , 249 , 229–235.
doi:10.1016/S0043-1648(01)00569-5

2. Kübarsepp , J. , Pirso , J. and Klaasen , H. Tribological characterization of TiC-base cermets. In Proc. 2000 Powder Metallurgy World Congress. Kyoto , 2000 , Part 2 , 1633–1636.

3. Pirso , J. , Viljus , M. and Letunovitš , S. Friction and dry sliding wear behaviour of cermets. Wear , 2006 , 260 , 815–824.
doi:10.1016/j.wear.2005.04.006

4. Ellis , J. L. and Goetzel , C. G. ASM Handbook , Vol. 2 , Properties and Selection: Nonferrous Alloys and Special-Purpose Materials , 1991 , ASM.

5. Juhani , K. Reactive Sintered Chromium and Titanium Carbide-Based Cermets. PhD Thesis , TUT Press , 2009.

6. Platit Technical Specifications: www.platit.com

7. Technical Specification Guide CEN/TS 1071-8:2004 of the European Committee for Standardiza­tion , “Advanced technical ceramics – Methods of test for ceramic coatings , Part 8: Rockwell indentation test for evaluation of adhesion”.

8. Oliver , W. C. and Pharr , G. M. Measurement of hardness and elastic modulus by instrumented indentation: Advances in understanding and refinements to methodology. J. Mater. Res. , 2004 , 19 , 3–20.
doi:10.1557/jmr.2004.19.1.3

 
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Current Issue: Vol. 19, Issue 4, 2013





Publishing schedule:
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