The tribological and mechanical properties of niobium carbides (NbC) bonded with cobalt or Fe3Al

Woydt, Mathias; Mohrbacher, Hardy

doi:10.1016/j.wear.2014.09.007

Cited by 68 publications

(38 citation statements)

References 14 publications

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“…A similar situation has been previously reported for RSPSconsolidated composites of the TiB 2 -TaC system [22] (Table 2) [32][33][34][35][36][37]; however, unlike TaC composites, NbC-based ceramics have an even higher indentation fracture toughness (6-8 MPa m À 2 ). Major contributions to such a high value of K IC are the crack deflection and bridging that take place on the boundary between (Ti,Nb)B 2 and (Nb,Ti)C (Fig.…”

Section: Mechanical Propertiessupporting

confidence: 83%

High-temperature reactive spark plasma consolidation of TiB2–NbC ceramic composites

Demirskyi

Sakka

Vasylkiv

2015

Ceramics International

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Section: Mechanical Propertiessupporting

confidence: 83%

High-temperature reactive spark plasma consolidation of TiB2–NbC ceramic composites

Demirskyi

Sakka

Vasylkiv

2015

Ceramics International

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“…A 300% increase in sliding speed resulted in 24% and 27% increases in the friction coefficients of the niobium carbide coated AISI 52100 steel balls for loads of 2 and 10 N, respectively. These results are in good agreement with Woydt and Mohrbacher [20]. The same increase in sliding speed resulted in 48% and 25% increases in the friction coefficients of the hardened AISI 52100 steel balls for the same loads of 2 and 10 N, respectively.…”

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confidence: 89%

Sliding Wear Behavior of Niobium Carbide Coated Aisi 52100 Bearing Steel

Krellin¹,

Milan²,

Costa³

et al. 2017

Tecnol. Metal. Mater. Min.

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Sliding wear behavior of niobium carbide coated AISI 52100 bearing steel balls against AISI 1045 quenched steel discs was investigated. Thermo-reactive diffusion (TRD) treatment was carried out at 1000 °C for 4 hours by pack cementation method. NbC phase with 11 µm in thickness was identified by SEM microscopy and XRD technique. Ball-on-disc wear tests were carried out without lubrication under 2 and 10N load at sliding speeds of 0.1 and 0.3 m/s. A 300% increase in sliding speed resulted in 24% and 27%, increasing in friction coefficient of niobium carbide coated AISI 52100 steel balls for 2N and 10N. Wear resistance of AISI 52100 steel was improved up to 78 times after TRD treatment depending on applied load and sliding velocity. Wear mechanisms are adhesive-oxidative for hardened balls and abrasive-oxidative for coated balls against hardened AISI 1045 steel discs. Keywords: Sliding wear; Steel; Niobium carbide coating; Friction. INTRODUCTIONThermo-reactive deposition/diffusion (TRD) treatment is a method for surface coating steels with a hard and wear-resistant layer of carbides, nitrides, carbonitrides [1] or borides [2] by the diffusion of carbon, nitrogen or boron in the steel substrate into a deposited layer of the carbide-, nitride-or boride-forming element.The TRD treatment can be performed using salt baths [3,4], fluidized beds [5,6] or pack cementation [7][8][9][10][11][12] at high temperatures (850-1050 °C) with treatment times of 0.5-10 hours, resulting in a layer of depth 5-15 µm.Pack cementation TRD powder usually consists of a metallic element (carbide-, nitride-or boride-forming); one inert filler that does not take part in the formation reactions of the layers, usually Al 2 O 3 or SiC; and an activator, for example NH 4 Cl that, when dissociated, chemically binds with the carbide-, nitride-or boride-forming element to form chlorides that will then react with the substrate to generate, for example, carbide layers [12,13].Niobium carbide can be used in high-temperature environments because it has a high melting point (3873 °C) The aims of this work are to produce a wear resistant coating of niobium carbide on AISI 52100 steel balls using the pack cementation method and evaluate its tribological behavior. AISI 52100 steel can be used in tools for cold work dies, cold extrusion tools, bearings, etc. Increasing the quality of the tools is only about 5% of its cost and its preparation time, making it feasible to consider any surface treatment as an investment [19]. Ball-on-disc wear tests were conducted according to ASTM G99-05 standard at sliding speeds of 0.1 and 0.3m/s and under loads of 2 and 10N. was carried out in an electrical resistance furnace under an argon atmosphere at atmospheric pressure. The hardened AISI 52100 steel balls were also analyzed. AISI 1045 steel discs, 6 mm in thickness, were cut from a bar of diameter 25.4 mm. The steel discs were sanded with silicon carbide abrasive paper up to 600 grit and polished with 1 µm alumina suspension. The AISI 1045 plain carbon steel ...

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“…NbC has a low density (7.79 g/cm 3 ), comparable to steel, and a good chemical stability of Nb 2 O 5 against water. Despite the promising properties of NbC, the potential of NbC as a major component in hard materials for wear applications was only recently reported by Woydt et al [9,10] and for machining by Uhlmann et al [11]. A remarkable NbC grain growth was observed in Co and Ni bonded NbC cermets after liquid phase sintering [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Content on the Microstructure and Mechanical Properties of NbC-Ni Based Cermets

Huang

Baets

Sukumaran

et al. 2018

Metals

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Abstract:The aim of this work was to correlate the overall carbon content in NbC-Ni, NbC-Ni-VC and NbC-Ni-Mo starting powders with the resulting microstructure, hardness, and fracture toughness of Ni-bonded NbC cermets. A series of NbC-Ni, NbC-Ni-VC and NbC-Ni-Mo cermets with different carbon content were prepared by conventional liquid phase sintering for 1 h at 1420 • C in vacuum. Microstructural analysis of the fully densified cermets was performed by electron probe microanalysis (EPMA) to assess the effect of carbon and VC or Mo additions on the NbC grain growth and morphology. A decreased carbon content in the starting powder mixtures resulted in increased dissolution of Nb, V, and Mo in the Ni binder and a decreased C/Nb ratio in the NbC based carbide phase. The Vickers hardness (HV 30 ) and Palmqvist indentation toughness were found to decrease significantly with an increasing carbon content in the Mo-free cermets, whereas an antagonistic correlation between hardness and toughness was obtained as a function of the Mo-content in Mo-modified NbC cermets. To obtain optimized mechanical properties, methods to control the total carbon content of NbC-Ni mixtures were proposed and the prepared cermets were investigated in detail.

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The tribological and mechanical properties of niobium carbides (NbC) bonded with cobalt or Fe3Al

Cited by 68 publications

References 14 publications

High-temperature reactive spark plasma consolidation of TiB2–NbC ceramic composites

High-temperature reactive spark plasma consolidation of TiB2–NbC ceramic composites

Sliding Wear Behavior of Niobium Carbide Coated Aisi 52100 Bearing Steel

Effect of Carbon Content on the Microstructure and Mechanical Properties of NbC-Ni Based Cermets

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