Fabrication of Ta-Si-C targets and their utilization for deposition of low friction wear resistant nanocomposite Si-Ta-C-(N) coatings intended for wide temperature range tribological applications

Бондарев, А.В.; Vorotilo, S.; Щетинин, И. В.; Левашов, Е. А.; Shtansky, Dmitry V.

doi:10.1016/j.surfcoat.2018.12.030

Cited by 18 publications

(9 citation statements)

References 35 publications

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“…The presence of transient Si-based liquid phase was associated with vastly improved sinterability of the TaSi 2 -SiC ceramics during the hot pressing [55], which is consistent with previously reported beneficial effects of transient liquid phase on the sintering of refractory ceramics. Improved densification is achieved due to the increased mass transport and anisotropic grain growth [73].…”

Section: Sintering Of Tasic Composition: Thermodynamic Analysissupporting

confidence: 90%

“…The ΔG vs. T curves for SiC and tantalum silicide show clear inflection points at 1414 °C, which correspond to the melting point of Si (dotted line at Figure 2 e). The occurrence of reversible phase transformations (Equations (15) and (16)) in the Ta-Si-C system has been previously suggested based on thermodynamic calculations [ 54 ] and corroborated experimentally by differential calorimetry and thermogravimetric studies, as well as by prolific formation of liquid phase during the hot pressing of TaSi 2 -SiC composites at temperatures above 1600 °C [ 55 ] as follows ( Figure 2 c): TaSi 2 + SiC→ TaC+Si melt (T > 1414 °C; µ Si < −5.655 eV) TaC + Si solid → TaSi 2 + SiC (T < 1414 °C; µ Si > −5.655 eV) …”

Section: Resultsmentioning

confidence: 78%

“…Since the grand potential phase diagrams are constructed at the temperature of 0 K, the stability of binary phases in the Ta-Si-C system was additionally evaluated using the Ellingham phase diagram ( Figure 2 e). SiO 2 was added to the analysis since the EDS investigation revealed the presence of 2–3% oxygen impurities in TaSiC composition, and the previous investigation [ 55 ] has also revealed the formation of 2–5% amorphous SiO 2 in the TaSi 2 -SiC combustion products. Studies on diffusion pairs in the Ta-Si-C system have also revealed the formation of stable amorphous SiO 2 films [ 67 , 68 ].…”

Section: Resultsmentioning

confidence: 99%

“…In this work, the following two heterophase experimental models in the Ta-Si-C system were prepared using mechanically activated combustion synthesis: TaSi 2 -TaC-SiC ceramic powders [54,55], designated TaSiC, and discretely-reinforced TaSi 2 -TaC-SiC-SiC nanowire composition [14,56], designated TaSiC-nw.…”

Section: Preparation Of Composite Powdersmentioning

confidence: 99%

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Effect of In Situ Grown SiC Nanowires on the Pressureless Sintering of Heterophase Ceramics TaSi2-TaC-SiC

et al. 2020

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To ascertain the influence of SiC nanowires on sintering kinetics of heterophase ceramics, two composite powders (TaSi2-TaC-SiC and TaSi2-TaC-SiC-SiCnanowire) are fabricated by mechanically activated combustion synthesis of Ta-Si-C and Ta-Si-C-(C2F4) reactive mixtures. Remarkable compressibility is achieved for the TaSi2-TaC-SiC-SiCnanowire composition (green density up to 84% as compared with 45.2% achieved for TaSi2-SiC-TaC) which is attributed to the lubricating effect of residual adsorbed fluorinated carbon (most likely C4F8). The outcomes of pressureless sintering of TaSi2-TaC-SiC and TaSi2-TaC-SiC-SiCnanowire compositions are vastly different; the former experiences no significant densification or grain growth and does not attain structural integrity, whereas the latter achieves relative density up to 93% and hardness up to 11 GPa. The SiC nanowires are not retained in consolidated ceramics, but instead, act as a sintering aid and promote densification and grain growth. Sintering mechanisms of TaSi2-TaC-SiC and TaSi2-TaC-SiC-SiCnanowire powders are analyzed using thermodynamic and ab initio grand potential calculations, as well as the analysis of grain size versus relative density relations. In the case of solid-state sintering, the densification and grain growth in heterophase non-oxide ceramics are governed by the same mechanisms as previously investigated single-phase oxides. The presence of SiC nanowires enhances grain-boundary related diffusion processes due to the high specific surface and aspect ratio of the nanowires. At 1500 °C, where the formation of the transient Si-based liquid phase is thermodynamically viable, only the SiC nanowire-containing composition demonstrated the intense grain coarsening and densification associated with liquid-assisted sintering. This effect can be attributed both to the presence of SiC nanowires and purification of residual oxide impurities due to C2F4-activated combustion synthesis employed for the in situ formation of SiC nanowires.

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Section: Sintering Of Tasic Composition: Thermodynamic Analysissupporting

confidence: 90%

Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Preparation Of Composite Powdersmentioning

confidence: 99%

See 2 more Smart Citations

Effect of In Situ Grown SiC Nanowires on the Pressureless Sintering of Heterophase Ceramics TaSi2-TaC-SiC

et al. 2020

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“…Alloying by nitrogen and carbon is another promising avenue for enhancing the properties of TaSi 2 -based coatings. Such coatings were deposited by magnetron sputtering of composite TaSi 2 -SiC targets in the atmosphere with varied nitrogen content, resulting in hardness up to 26 GPa, friction coefficient below 0.3 at temperatures above 600 • C, and heat resistance up to 800 • C [23]. The introduction of Si 3 N 4 into the TaSi 2 coatings allows for a substantial increase in oxidation resistance [24].…”

Section: Introductionmentioning

confidence: 99%

Structure, Oxidation Resistance, Mechanical, and Tribological Properties of N- and C-Doped Ta-Zr-Si-B Hard Protective Coatings Obtained by Reactive D.C. Magnetron Sputtering of TaZrSiB Ceramic Cathode

Kiryukhantsev-Korneev

Сытченко

Vorotilo

et al. 2020

Coatings

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Coatings in the Ta-Zr-Si-B-C-N system were produced by magnetron sputtering of a TaSi2-Ta3B4-(Ta,Zr)B2 ceramic target in the Ar medium and Ar-N2 and Ar-C2H4 gas mixtures. The structure and composition of coatings were studied using scanning electron microscopy, glow discharge optical emission spectroscopy, energy-dispersion spectroscopy, and X-ray diffraction. Mechanical and tribological properties of coatings were determined using nanoindentation and pin-on-disk tests using 100Cr6 and Al2O3 balls. The oxidation resistance of coatings was evaluated by microscopy and X-ray diffraction after annealing in air at temperatures up to 1200 °C. The reactively-deposited coatings containing from 30% to 40% nitrogen or carbon have the highest hardness up to 29 GPa and elastic recovery up to 78%. Additionally, coatings with a high carbon content demonstrated a low coefficient of friction of 0.2 and no visible signs of wear when tested against 100Cr6 ball. All coatings except for the non-reactive ones can resist oxidation up to a temperature of 1200 °C thanks to the formation of a protective film based on Ta2O5 and SiO2 on their surface. Coatings deposited in Ar-N2 and Ar-C2H4 demonstrated superior resistance to thermal cycling in conditions 20-T−20 °C (where T = 200–1000 °C). The present article compares the structure and properties of reactive and “standard-inert atmosphere” deposited coatings to develop recommendations for optimizing the composition.

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Insight into high temperature performance of magnetron sputtered Si-Ta-C-(N) coatings with an ion-implanted interlayer

Бондарев

Antonyuk

Kiryukhantsev‐Korneev

et al. 2021

Applied Surface Science

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Fabrication of Ta-Si-C targets and their utilization for deposition of low friction wear resistant nanocomposite Si-Ta-C-(N) coatings intended for wide temperature range tribological applications

Cited by 18 publications

References 35 publications

Effect of In Situ Grown SiC Nanowires on the Pressureless Sintering of Heterophase Ceramics TaSi2-TaC-SiC

Effect of In Situ Grown SiC Nanowires on the Pressureless Sintering of Heterophase Ceramics TaSi2-TaC-SiC

Structure, Oxidation Resistance, Mechanical, and Tribological Properties of N- and C-Doped Ta-Zr-Si-B Hard Protective Coatings Obtained by Reactive D.C. Magnetron Sputtering of TaZrSiB Ceramic Cathode

Insight into high temperature performance of magnetron sputtered Si-Ta-C-(N) coatings with an ion-implanted interlayer

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