Nanostructure and properties of TiC/a-C:H composite coatings

Pei, Yu; Galvan, D.; Hosson, J.Th.M. De

doi:10.1016/j.actamat.2005.05.045

Cited by 275 publications

(166 citation statements)

References 33 publications

Supporting

Mentioning

149

Contrasting

Order By: Relevance

“…Figure 5a, and reference 32 ). With increased C content for a given Ti content, the maximum C fraction in the TiC x phase (x ~0.47-0.97) [32,33] is exceeded, which triggers a phase separation into TiC and C, in the case of no Si [4,5,11] or SiC (in the present case). The observation from Figure 5 and XPS indicates that the amorphous SiC phase has a much more limited diffusivity of Ag and TiC than amorphous Si and C. Thus, the emerging TiC and Ag crystallites may become covered by the amorphous matrix more frequently.…”

Section: Resultsmentioning

confidence: 94%

See 1 more Smart Citation

Microstructure evolution of Ti–Si–C–Ag nanocomposite coatings deposited by DC magnetron sputtering

et al. 2010

View full text Add to dashboard Cite

Nanocomposite coatings consisting of Ag and TiC x (x<1) crystallites in a matrix of amorphous SiC were deposited by high-rate magnetron sputtering from Ti-Si-C-Ag compound targets. Different target compositions were used to achieve coatings with a Si content of ~13 at%, while varying the C/Ti ratio and Ag content. Electron microscopy, helium ion microscopy, x-ray photoelectron spectroscopy, and x-ray diffraction were employed to trace the Ag segregation during deposition and possible decomposition of the amorphous SiC. Eutectic interaction between Ag and Si is observed and the Ag forms threading grains that coarsen with increased coating thickness. The coatings can be tailored for conductivity horizontally or vertically, by controlling the shape and

show abstract

Section: Resultsmentioning

confidence: 94%

“…TiC-based nanocomposites have been studied intensively during the last decade and are well known as tribological coatings [1,2,3,4,5,6]. They have recently also been adopted in electrical applications [ 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution of Ti–Si–C–Ag nanocomposite coatings deposited by DC magnetron sputtering

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Although high-strength nanoceramics are commonly brittle, there are experimental data indicative of enhanced fracture toughness exhibited by several special nanocrystalline ceramics at comparatively low homologous or moderate temperatures (e.g. reviews [1,2,4], book [3] and original papers [8][9][10][11][12][13]19]). These experimental data are logically explained within the concept that (i) conventional toughening micromechanisms (that dominate in microcrystalline-matrix ceramics) operate in specific, inherent to nanostructures, ways in nanocrystalline ceramics where they effectively hamper crack growth and (ii) new, special (inherent to nanocrystallinity) toughening micromechanisms come into play in nanocrystalline ceramics [30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Fracture Processes In Nanoceramics: General Aspects and Key mentioning

confidence: 99%

Micromechanics of fracturing in nanoceramics

Ovid’ko

2015

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

An overview of key experimental data and theoretical representations on fracture processes in nanoceramics is presented. The focuses are placed on crack growth in nanoceramics and their toughening micromechanics.Conventional toughening micromechanisms are discussed which effectively operate in both microcrystalline-matrix ceramics containing nanoinclusions and nanocrystalline-matrix ceramics. Particular attention is devoted to description of special (new) toughening micromechanisms related to nanoscale deformation occurring near crack tips in nanocrystalline-matrix ceramics. In addition, a new strategy for pronounced improvement of fracture toughness of ceramic materials through fabrication of ceramic-graphene nanocomposites is considered. Toughening micromechanisms are discussed which operate in such nanocomposites containing graphene platelets and/or few-layer sheets.

show abstract

“…In recent years, self-lubricating PVD tribological thin films have been intensively investigated [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Among these, PVD nanocomposite coatings containing soft metals (e.g.…”

Section: Introductionmentioning

confidence: 99%

CrCuAgN PVD nanocomposite coatings: Effects of annealing on coating morphology and nanostructure

Liu

Iamvasant

Liu

et al. 2017

Applied Surface Science

View full text Add to dashboard Cite

CrCuAgN PVD nanocomposite coatings were produced using pulsed DC unbalanced magnetron sputtering. This investigation focuses on the effects of post-coat annealing on the surface morphology, phase composition and nanostructure of such coatings. In coatings with nitrogen contents up to 16 at.%, chromium exists as metallic Cr with N in supersaturated solid solution, even after 300 o C and 500 o C post-coat annealing.Annealing at 300 o C did not obviously change the phase composition of both nitrogen-free and nitrogen-containing coatings; however, 500 o C annealing resulted in significant transformation of the nitrogen-containing coatings. The formation of Ag aggregates relates to the (Cu+Ag)/Cr atomic ratio (threshold around 0.2), whereas the formation of Cu aggregates relates to the (Cu+Ag+N)/Cr atomic ratio (threshold around 0.5). The primary annealing-induced changes were reduced solubility of Cu, Ag and N in Cr, and the composition altering from a mixed ultra-fine nanocrystalline and partly amorphous phase constitution to a coarser, but still largely nanocrystalline structure. It was also found that, with sufficient Cu content (> 12 at.%), annealing at a moderately high temperature (e.g. 500 o C) leads to transportation of both Cu and Ag (even at relatively low concentrations of Ag, ≤ 3 at.%) from inside the coating to the coating surface, which resulted in significant reductions in friction coefficient, by over 50% compared to that of the substrate (from 0.31 to 0.14 with a hemispherical diamond indenter, and from 0.83 to 0.40 with an alumina ball counterface, respectively). Results indicate that the addition of both Cu and Ag (in appropriate *Manuscript Click here to view linked References 2 concentrations) to nitrogen-containing chromium is a viable strategy for the development of 'self-replenishing' silver-containing thin film architectures for temperature-dependent solid lubrication requirements or antimicrobial coating applications.

show abstract

Nanostructure and properties of TiC/a-C:H composite coatings

Cited by 275 publications

References 33 publications

Microstructure evolution of Ti–Si–C–Ag nanocomposite coatings deposited by DC magnetron sputtering

Microstructure evolution of Ti–Si–C–Ag nanocomposite coatings deposited by DC magnetron sputtering

Micromechanics of fracturing in nanoceramics

CrCuAgN PVD nanocomposite coatings: Effects of annealing on coating morphology and nanostructure

Contact Info

Product

Resources

About