Structure, hardness and thermal stability of Ti(Al,N) coatings

Oliveira, J.C.; Manaia, A.; Cavaleiro, A.; Vieira, M.T.

doi:10.1016/j.surfcoat.2006.08.031

Cited by 13 publications

(2 citation statements)

References 11 publications

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“…2~4, the friction coefficients of TiAlN, CrAlN and CrTiAlN coatings decrease sharply compared with TiN and CrN, and the antiwear ability of the coating can be improved. The addition of Al to the nitride coatings will influence many properties of nitride coatings such as structure, hardness and oxidation resistance and so on [8].Fig. 5 shows X-ray spectroscopy analysis for the Al2p in TiAlN and CrAlN coatings.The corresponding Al2p spectra show one major component centred at 74.5ev.The peak at 74.5ev can be substantially attributed to the formation of AlN [9].It has been reported that incorporation of Al atoms into the CrN and TiN binary phase can be develop amorphous AlN network in grain boundary, which can effectively reduce the grain size due to the grain boundary effect [10].According to the hall-petch relationship [11],the hardness of the material increases with decreaseing crystallite size.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Chromium, Titanium and Aluminum on the Friction Coefficient and Wear Property in the Nitride Coatings

Han

Liu

2012

KEM

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A serious of nitride coatings including chromium, titanium and aluminum are deposited on the glass and stainless steel by Closed-Field unbalanced magnetron sputtering. The friction coefficient is measured by tribolometer and the wear traces of the coatings can be studied by the optical micrographs, those indicate that the friction coefficients of TiN、 CrN、TiAlN、CrAlN and CrTiAlN decrease sequentially as well as the anti-wear of the coatings can be enhanced. According to X-ray photoelectron spectroscopy analysis for the coatings, aluminum nitride can be indentified in the nitride coatings with Al element, which enhances the hardness and anti-wear performance of the coatings. The chrome oxide can be found in the nitride coatings with Cr element, which enhances the self-chip removal ability of the coatings and decreases the friction coefficients of the coatings; titanium oxide existing in the coatings is not good for the friction and anti-wear of the coatings. Chromium titanium aluminum nitride naturally is of higher hardness than the ternary nitride, as well as Chromium and aluminum in the coatings is in favor for the low friction coefficient and good anti-wear property.

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Section: Discussionmentioning

confidence: 99%

The Effect of Chromium, Titanium and Aluminum on the Friction Coefficient and Wear Property in the Nitride Coatings

Han

Liu

2012

KEM

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“…To prolong the lifetime of these hard coatings and enhance their mechanical characteristics are essential to the development of nitride coatings, adding a second element to form a ternary TMN coating for further performance improvement is frequently proposed. Common dopping elements include transition metals, such as Cu, Ag, Hf, or W [10][11][12][13][14], and group I3-I4 species, such as B, Si, and Al [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Co-Sputtering (Mo, Hf)N Coatings

Hsu

2022

Coatings

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This work focused on the microstructure and mechanical properties of (Mo, Hf)N coatings deposited by radio frequency reactive magnetron co-sputtering technique with input power modulation. The coating characteristics, including indentation hardness, modulus, and tribological behavior, were discussed in terms of deposition parameter, composition, phase, and microstructure. The (Mo, Hf)N thin films were fabricated at a fixed Ar/N2 inlet gas ratio of 12/8 sccm/sccm and modulated input powers. The input power of Mo was fixed at 150 W, while that of the Hf target was managed from 25 to 200 W. The deposition rate and the Hf content of the (Mo, Hf)N coatings increased with input power. The (Mo, Hf)N ternary nitride coatings showed a polycrystalline microstructure with B1-MoN(111), β-Mo2N (112), γ-Mo2N(111), (200), and MoN2(200) phases in X-ray diffraction patterns as input power modulation were 150/25 to 150/100 W/W. The multiple phase microstructure feature and detail crystal development were demonstrated through transmission electron microscopy. According to nanoindentation and wear test results, ternary (Mo, Hf)N coatings represented more improved mechanical characteristics than the MoN and HfN binary nitride films. The 150/100 W/W deposited (Mo, Hf)N coating exhibited a highest hardness of 22.5 GPa when Hf content was at 5.6 at.%. The superior anti-wear behavior of this film with least wear damage was observed as well. The multiphase and solid-solution strengthening of the (Mo, Hf)N coatings, i.e., a microstructure feature of mixed B1-MoN, β-Mo2N, γ-Mo2N, and MoN2 phases and Hf doping in MoN, were the responsible for the superior mechanical and tribological behavior for the (Mo, Hf)N coatings.

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