Effect of NbC content on microstructure and mechanical properties of W-NbC composites

Wei, Boxin; Wang, Yujin; Zhao, Yanwei; Wang, Dong; Song, Guanyu; Fu, Yong Qing; Zhou, Yu

doi:10.1016/j.ijrmhm.2017.09.008

Cited by 19 publications

(7 citation statements)

References 31 publications

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“…The synthetic self-lubrication phase CrS is favorable for the composite coating’s anti-wear and friction reduction capabilities [ 14 , 19 ]. Moreover, the addition of NbC can not only lead to microstructural fineness, but also result in a large number of ceramic particles distribute in the coating, which endow the coating with excellent wear resistance [ 21 , 27 ]. However, there are no similar reports about the comprehensive impact of CrS and NbC on the wear behavior of laser clad coatings.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, we select Stellite 6 as metal matrix to synthesize CrS with WS 2 . As a common hard alloy additive, NbC possesses high melting point (~3600 °C), high hardness (~19.6 GPa), and a density of 7.79 g/cm 3 (which is close to Co, ~8.9 g/cm 3 ) [ 21 ]; because of these advantages, NbC was selected as additive with the purpose of improving CrS formation and refining the microstructure of the metal matrix. In the present research, Co-based alloy powder (Stellite 6, powder size: about 75 μm), WS 2 (particle size: 0.5–1 μm), and NbC (particle size: 1–3 μm) were used as cladding materials.…”

Section: Methodsmentioning

confidence: 99%

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Reactive Fabrication and Effect of NbC on Microstructure and Tribological Properties of CrS Co-Based Self-Lubricating Coatings by Laser Cladding

et al. 2017

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The CrS/NbC Co-based self-lubricating composite coatings were successfully fabricated on Cr12MoV steel surface by laser clad Stellite 6, WS2, and NbC mixed powders. The phase composition, microstructure, and tribological properties of the coatings ware investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS), as well as dry sliding wear testing. Based on the experimental results, it was found reactions between WS2 and Co-based alloy powder had occurred, which generated solid-lubricant phase CrS, and NbC play a key role in improving CrS nuclear and refining microstructure of Co-based composite coating during laser cladding processing. The coatings were mainly composed of γ-Co, CrS, NbC, Cr23C6, and CoCx. Due to the distribution of the relatively hard phase of NbC and the solid lubricating phase CrS, the coatings had better wear resistance. Moreover, the suitable balance of CrS and NbC was favorable for further decreasing the friction and improving the stability of the contact surfaces between the WC ball and the coatings. The microhardness, friction coefficient, and wear rate of the coating 4 (Clad powders composed of 60 wt % Stellite 6, 30 wt % NbC and 10 wt % WS2) were 587.3 HV0.5, 0.426, and 5.61 × 10−5 mm3/N·m, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Reactive Fabrication and Effect of NbC on Microstructure and Tribological Properties of CrS Co-Based Self-Lubricating Coatings by Laser Cladding

et al. 2017

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“…The magnitude of the coefficient of friction indicates the level of adhesion of the surface of the coating, which implies that the adhesion wear resistance of the coating 3# is better than others. When the amount of NbC added was more than 20 %, NbC aggregates were formed with increasing NbC content of the coating, leading to pores and cracks between the NbC and the NbC [27]. Therefore, it is impossible to add NbC to reduce COF.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Wear and Corrosion Properties of Plasma Transferred Arc Ni-based Coatings Reinforced with NbC Particles

Cheng¹,

Chen²,

Hou³

et al. 2021

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The wear and corrosion resistance of Ni-based niobium carbide (NbC) coatings were investigated via scanning electron microscopy, energy dispersive spectrometry, particle size analysis, X-ray diffraction, electrochemical polarization, electrochemicl impedance spectroscopy, digital microhardness testing and wear testing. The results showed that the substrate was mainly composed of a γ-Cr (Fe) solid solution, and the composite coating was composed of FeNi, NbC, and Ni. In addition, the hardness of the coating increased gradually with increasing NbC content. The optimal corrosion resistance and wear resistance of the coating were realized at an NbC content of 20%.

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“…However, the densification of W is very difficult due to its high melting point and low ductility [3][4]. In recent years, fully dense W composites have been fabricated at much lower temperatures by utilizing powder metallurgy and advanced sintering techniques or the addition of some transition elements or their compounds [4][5]. Activated sintering of W and W matrix composites with the small amounts of metallic additives (such as Ni, Co, Fe, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…resulted in highly densified sintered bodies [6][7]. Furthermore, hightemperature materials such as borides, nitrides, carbides or oxides have been also added to tungsten to enhance the mechanical properties at elevated temperatures [4,[8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Normal ve Kriyojenik Şartlarda Öğütmenin Aktive Edilmiş Sinterleme Süreçleri ile Geliştirilen Tungsten Esaslı Kompozitlerin Mikroyapı ve Özellikleri Üzerindeki Etkisi

Balcı

Ağaoğulları

Somer

et al. 2019

Cumhuriyet Science Journal

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Tungsten matrix composites reinforced with TiB2 and Y2O3 particles were fabricated by milling under ambient/cryogenic conditions and Ni activated sintering. Powder blends constituting the W-1 wt. % Ni-2 wt. % TiB2-1 wt. % Y2O3 composition were mechanically milled for 12 h under ambient condition or cryomilled for 10 min or sequentially milled under ambient and cryogenic conditions. Milling was carried out in a high-energy ball mill under ambient condition whereas cryogenic milling was conducted in externally circulated liquid nitrogen. Milled powders were compacted using a hydraulic press and the pellets were sintered at 1400°C for 1 h under Ar / H2 gas flowing conditions. The effects of different milling types on the microstructural and mechanical properties of the sintered composites were investigated. After sintering, in addition to dominant W phase, small amounts of WB and NiW phases were detected in all sintered samples. The application of cryomilling after milling at ambient condition provided the disappearance of the clustered TiB2 and Y2O3 particles in the sintered sample: They were located at the grain boundaries of W1Ni matrix and homogeneously distributed through the microstructure. Sequentially milled and sintered composite had the highest relative density (95.77 %) and the highest microhardness (7.23 GPa) values among the samples. Nanoindentation tests showed that there was an improvement in the hardness and elastic modulus of W matrix phase, which yielded the values of 8.9 and 373.7 GPa, respectively.

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Effect of NbC content on microstructure and mechanical properties of W-NbC composites

Cited by 19 publications

References 31 publications

Reactive Fabrication and Effect of NbC on Microstructure and Tribological Properties of CrS Co-Based Self-Lubricating Coatings by Laser Cladding

Reactive Fabrication and Effect of NbC on Microstructure and Tribological Properties of CrS Co-Based Self-Lubricating Coatings by Laser Cladding

Wear and Corrosion Properties of Plasma Transferred Arc Ni-based Coatings Reinforced with NbC Particles

Normal ve Kriyojenik Şartlarda Öğütmenin Aktive Edilmiş Sinterleme Süreçleri ile Geliştirilen Tungsten Esaslı Kompozitlerin Mikroyapı ve Özellikleri Üzerindeki Etkisi

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