Microstructure and phase composition dependent tribological properties of TiC/a-C nanocomposite thin films

Kumar, N.; Natarajan, Gomathi; Dumpala, Ravikumar; Pandian, Ramanathaswamy; Bahuguna, Ashok; Srivastava, Sachin; Ravindran, T. R.; Rajagopalan, S.; Dash, S.; Tyagi, A.K.; Rao, M. S. Ramachandra

doi:10.1016/j.surfcoat.2014.08.038

Cited by 25 publications

(22 citation statements)

References 38 publications

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“…16 et al [21], where low deposition power (25 W) TiC peaks were centered at 221, 321, 527 and 706 cm -1 and these vibrational modes were found to be indicative of hypo-stoichiometric titanium carbide. The separation of the amorphous carbon peaks is even more significant at 30 W of Ti target power.…”

Section: Accepted M Manuscriptmentioning

confidence: 94%

TiC crystallite formation and the role of interfacial energies on the composition during the deposition process of TiC/a:C thin films

Oláh

Fogarassy

Sulyok

et al. 2016

Surface and Coatings Technology

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TiC / amorphous carbon (TiC/a:C) nanocomposite thin films were deposited from two targets by direct current (DC) magnetron sputtering system at room temperaure. The film´s composition and morphology were studied in detail by High Resolution Transmission Electron Microscopy (HRTEM), Selected Area Electron Diffraction (SAED), X-ray Photoelectron Spectroscopy (XPS) and Raman Spectroscopy. The sputtering power of carbon target (P C ) was kept at the constant 150 W, while the sputtering power of titanium target (P Ti ) was changed between 5 W and 150 W. Additionally, a C/Ti multilayer was deposited and characterized for comparison. The growth mechanism was derived from the XPS, Raman and HRTEM observations on the grown layer structures and it was completed by a semi-empirical equation for the dependence on the average atomic fraction of Ti. The HRTEM investigations A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 confirmed that the first nucleating phase is amorphous carbon due to its lowest surface energy among the possible phases. The second nucleating phase within the amorphous carbon matrix is TiC; its growth is kinetically not limited. The increase of Ti content resulted in larger TiC nanocrystallites and thinner amorphous carbon spacing between the TiC phases shown by HRTEM analysis. The characteristic texture of the crystallite structure was observed in the case of 120 W and 150 W of P Ti . All observation confirmed the two main phases; amorphous carbon + carbide phase. The hcp titanium phase was not formed due to nucleation barrier. The average sputtered composition differs from the average deposited composition due to different nucleation barriers of different phases.

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Section: Accepted M Manuscriptmentioning

confidence: 94%

TiC crystallite formation and the role of interfacial energies on the composition during the deposition process of TiC/a:C thin films

Oláh

Fogarassy

Sulyok

et al. 2016

Surface and Coatings Technology

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“…6a [5,6,9,40,41]. It is worth to mention that in the work of Hu et al [37] similar trends of hardness, elasticity and CoF values depending on the elemental composition were presented.…”

Section: Resultsmentioning

confidence: 53%

“…These types of nanocomposites show good hardness values if the crystal size is sufficiently small and the soft second phase, which has a so-called self-lubricant property, helps blocking crack propagation [6][7][8]. The mechanical and tribological properties also depend on grain/grain boundary microstructure and grain size refinement can be manipulated by sputtering power (element composition) [9] or by parameters of the deposition plasma (ion flux) [10] and by temperature. Thus, there are a number of techniques to create titanium carbide.…”

Section: Introductionmentioning

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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“…ACCEPTED MANUSCRIPT 10 In this sample D and G band is located at 1317 and 1570 cm −1 , respectively. I(D)/I(G) ratio decreased to 0.58 is the signature of a-C:H and absence of sp 2 domains [26].…”

Section: Accepted Manuscriptmentioning

confidence: 72%

Wear resistant multiphase compound of Ti(C, O, N)/a-C:H nano composite film

et al. 2015

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Microstructure and phase composition dependent tribological properties of TiC/a-C nanocomposite thin films

Cited by 25 publications

References 38 publications

TiC crystallite formation and the role of interfacial energies on the composition during the deposition process of TiC/a:C thin films

TiC crystallite formation and the role of interfacial energies on the composition during the deposition process of TiC/a:C thin films

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

Wear resistant multiphase compound of Ti(C, O, N)/a-C:H nano composite film

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