Mechanical characterisation of TiN/ZrN multi-layered coatings

Abstract

Ultra-microhardness, adhesion and residual-stress analysis tests were performed on reactive sputtered deposited TiN/ZrN multi-layers. Hardness values as high as $3600 Vickers were achieved for this material. Scratch tests of coatings deposited on steel substrates con®rmed the existence of different mechanisms associated with total adhesion failure, depending essentially on multi-layer deposition control parameters. Stress-relaxation measurements indicated the compressive nature of these thin ®lms. The inherent mechanical characterisation was broadened regarding the induced contributions from ®lm thickness, total interfacial roughness, number of bi-layers and corresponding modulation periodicity. Complementary analyses with data extracted from structural XRD studies have been undertaken. # 1999 Elsevier Science S.A. All rights reserved.

Computational fluid dynamic and thermal stress analysis of coatings for high‐temperature corrosion protection of aerospace gas turbine blades

“…Some variation and heterogeneity are computed for the two‐layer model (Figure ); however, there is a significantly different pattern for the single‐layer model (Figure ), which exhibits an outer peripheral band of low strain and an inner oblate edged rectangular zone of minimum strain energy. The computations show good similarity with other single, two‐layered and three‐layered finite‐element models, for example, Tavaresa et al and Shekeri et al…”

“…Some variation and heterogeneity are computed for the two-layer model (Figure 19); however, there is a significantly different pattern for the single-layer model (Figure 20), which exhibits an outer peripheral band of low strain and an inner oblate edged rectangular zone of minimum strain energy. The computations show good similarity with other single, two-layered and three-layered finite-element models, for example, Tavaresa et al 33 and Shekeri et al 34 Figures 21-29 present computational visualizations for the three-layer model (steel + titanium + SiC ceramic), two-layer model (steel + titanium), and the uncoated (steel) model. For the simulations in Figures 21-23, we have shown the full body models (three-dimensional) rather than just the top surface two-dimensional distribution plots (as in Figures 9-20).…”

Mechanical and surface analysis of Ti0.4Al0.6N/Mo multilayers

“…These depth-sensing measurements allow the estimation of not only the hardness but also Young's modulus [12,13]. The ultramicrohardness experiments were carried out on a computerised Fischerscope dynamic ultramicrohardness tester (H100 model), using a Vickers indenter and a maximum load of 30 mN.…”

“…A 200 m radius diamond tip was used with the scratching speed being set at 0.0167 cm/s while the load rate was kept at 100 N/min. An analysis of the AE spectrum coupled with careful microscopic analysis of the scratch tracks aids the task of identifying the value of the critical load (¸ ) [13,14]. We consider¸ as the load at which the "rst adhesive failure mode occurs and it is clearly visible, regardless of the "lm remaining bonded after this incident along the segueing scratch track.…”

Pitting corrosion of TiN-coated stainless steel in 3 % NaCl solution

“…The tribological properties of single-layer and multi-layer TiN coatings were extensively studied in the literature and published in a handbook. [1][2][3][4][5][6][7][8] On the other hand, the corrosion of TiN in tribological applications was often overlooked, mainly due to the shorter life time of the cutting tools. TiN, with its golden colors, has been used for decorative applications, such as watches, architectural materials and ornaments.…”