Tribological and mechanical properties of nanocrystalline-TiC/a-C nanocomposite thin films

Musil, J.; Novák, Petr; Čerstvý, R.; Soukup, Z.

doi:10.1116/1.3294717

Cited by 123 publications

(53 citation statements)

References 58 publications

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“…This in combination with high raw material prices motivates investigations for alternative solutions. While others have studied TiC-based nanocomposites as tribological coatings [2,3,4,5,6,7,8,9], we found that such nanocomposites can function as an electrical contact material [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. In our previous works, coatings consisting of nanocrystalline (nc) TiC embedded in an amorphous (a) C or SiC matrix were deposited by dc magnetron sputtering.…”

Section: Introductionmentioning

confidence: 99%

Effects of A-elements (A Si, Ge or Sn) on the structure and electrical contact properties of Ti–A–C–Ag nanocomposites

et al. 2012

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Ti-A-C-Ag (A is Si, Ge or Sn) nanocomposite coatings have been deposited by dc magnetron sputtering in an ultra high vacuum chamber. Electron microscopy, energydispersive x-ray spectroscopy, x-ray photoelectron spectroscopy, and x-ray diffraction show that all coatings contain nanocrystalline TiC and Ag grains in a matrix of mainly amorphous C. A C/Ti ratio above unity yields a homogenous distribution of Ag with a reduced grain size. From a chemical point of view, the addition of Ge and Sn to the Ti-C- 2 Ag system should increase the conductivity of the coatings since the formation of more metallic phases than Si. We demonstrate that Si can be replaced with Ge and Sn and still yield a homogeneous distribution of Ag. The incorporation of Ge and Sn to the Ti-C-Ag system results in elemental precipitation and intermetallic phases, respectively. This gives improved electrical properties compared to Ti-Si-C-Ag coatings, and a contact resistance at loads of ~1 N against an Au probe (radius of 0.7 mm) that is comparable to that of Ag.

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Section: Introductionmentioning

confidence: 99%

Effects of A-elements (A Si, Ge or Sn) on the structure and electrical contact properties of Ti–A–C–Ag nanocomposites

et al. 2012

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“…It is clearly seen that the H/E ⁎ ratio as well as the hardness start to decrease after a contact depth of 75 nm. It is shown that the values of H/E ⁎ ratio of TiAlBSiN coating are close to H/E ⁎ ˃ 0,1 which satisfy the condition proposed by Musil [43] for protective nanocomposite coatings and under certain circumstances, the gain from the H/E ⁎ ratio 0.08-0.09 in the wear rate reduction could be substantial.…”

Section: Nanoindentation Studiesmentioning

confidence: 75%

“…It is demonstrated that not only hardness or elastic modulus but also the ratios H/E ⁎ and H 3 /E ⁎2 are very important material properties [40,41,43,44]. It is commonly known, that wear resistance of a solid can be adjusted by tailoring its elastic-plastic properties.…”

Section: Nanoindentation Studiesmentioning

confidence: 99%

Combined reactive/non-reactive DC magnetron sputtering of high temperature composite AlN–TiB2–TiSi2

et al. 2016

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High temperature composite target AlN-TiB 2 -TiSi 2 with heterogeneous distribution of compounds (AlN-50 wt.%; TiB 2 -35 wt.%; TiSi 2 -15 wt.%) is used for sputtering via combined reactive/non-reactive DC magnetron sputtering onto substrate materials either cylindrical polished steel (Fe, 18%-Ni, 12%-Cr, 10%-Ti) 3 mm diameter or monocrystalline silicon. The gradient coating has been produced by sequential non-reactive and reactive sputtering of the target. The structural and morphological properties of the deposited films are analyzed by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy. The tribo-mechanical properties are studied by means of nanoindentation and nanowear tests. The gradient film is composed of two layers with different microstructure and elemental composition. The first layer with thickness~200 nm is mainly based on light B, C and N as well metal elements Al, Si and Ti. The presence of very well distributed nanocrystals embedded in an amorphous matrix, with crystal sizes ranging from 5 to 40 nm is observed in the second layer~700 nm thickness and composed of Al, Ti, Si, B, and N. Films show very flat surfaces, with roughness around 0.35 nm. The hardness, elastic modulus, elastic recovery (W e ), H/E ⁎ ratio and H 3 /E ⁎2 ratio are determined as 17.55 GPa, 216.7 GPa, 60%, 0.08 and 0.12 GPa, respectively. Nanowear tests demonstrate relatively high wear resistance of the coatings. Samples show promising characteristics for hard protective adaptive coatings and diffusion barriers due to short propagation of dislocations in the amorphous matrix and the elastic and hard nature of the nanocomposite structure.

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“…In addition, the tribological behavior of this type of coatings can be determined by the measured values of H and E [32]. The values of the H/E, H 3 /E 2 and coefficient of friction (CoF, m) are summarized in Fig.…”

Section: Resultsmentioning

confidence: 99%

Ceramic TiC/a:C protective nanocomposite coatings: Structure and composition versus mechanical properties and tribology

Oláh

Fogarassy

Sulyok

et al. 2016

Ceramics International

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a b s t r a c tThe relationship between the structure, elemental composition, mechanical and tribological properties of TiC/amorphous carbon (TiC/a:C) nanocomposite thin films was investigated. TiC/a:C thin film of different compositions were sputtered by DC magnetron sputtering at room temperature. In order to prepare the thin films with various morphology only the sputtering power of Ti source was modified besides constant power of C source. The elemental composition of the deposited films and structural investigations confirmed the inverse changes of the a:C and titanium carbide (TiC) phases. The thickness of the amorphous carbon matrix decreased from 10 nm to 1-2 nm simultaneously with the increasing Ti content from 6 at% to 47 at%. The highest hardness (H) of $ 26 GPa and modulus of elasticity (E) of $ 220 GPa with friction coefficient of 0.268 was observed in case of the film prepared at $ 38 at% Ti content which consisted of 4-10 nm width TiC columns separated by 2-3 nm thin a:C layers. The H3/E2 ratio was $ 0.4 GPa that predicts high resistance to plastic deformation of the TiC based nanocomposites beside excellent wear-resistant properties (H/E ¼0.12).

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Tribological and mechanical properties of nanocrystalline-TiC/a-C nanocomposite thin films

Cited by 123 publications

References 58 publications

Effects of A-elements (A Si, Ge or Sn) on the structure and electrical contact properties of Ti–A–C–Ag nanocomposites

Effects of A-elements (A Si, Ge or Sn) on the structure and electrical contact properties of Ti–A–C–Ag nanocomposites

Combined reactive/non-reactive DC magnetron sputtering of high temperature composite AlN–TiB2–TiSi2

Ceramic TiC/a:C protective nanocomposite coatings: Structure and composition versus mechanical properties and tribology

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