Electrochemical Behavior of TiCN–Ni‐Based Cermets

Kumar, B.V. Manoj; Balasubramaniam, R.; Basu, Bikramjit

doi:10.1111/j.1551-2916.2006.01412.x

Cited by 44 publications

(8 citation statements)

References 21 publications

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“…These cermets were cold compacted under a pressure of 100 MPa to give discs with a diameter of 15 mm and were subsequently sintered at a temperature of 1510°C for 1 h under vacuum. 26,27 The physical and mechanical properties of the cermets investigated are listed in Table I. These disks were cold mounted, and one side of the disks was polished with emery paper (Buehler, Lake Bluff, IL), followed by polishing with a polycrystalline diamond suspension (Matadi Supreme; Buehler) containing abrasive particles of various sizes (i.e., 9, 6, 3, 1, and 0.25 m).…”

Section: A Materialsmentioning

confidence: 99%

“…As part of the ongoing research [22][23][24][25][26] to understand the tribological performance of these novel materials under different wear conditions, the present work reports on the dry sliding wear and friction properties of TiCN-20wt%Ni-10wt%XC cermets when they were subjected to sliding at varying loads (5N-50N) against 100Cr6 steel. An important part of the present investigation will focus on understanding various wear mechanisms, which appear to be dependent on cermet composition under different sliding conditions.…”

Section: Introductionmentioning

confidence: 99%

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Tribochemistry in sliding wear of TiCN–Ni-based cermets

et al. 2008

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The tailoring of cermet composition to improve tribological properties requires careful choice of the type of secondary carbide. To investigate this aspect, a number of sliding tests were carried out on baseline TiCN-20Ni cermet and TiCN-20wt%Ni-10 wt% XC cermets (X ‫ס‬ W/Nb/Ta/Hf) at varying loads of 5N, 20N, and 50N against bearing steel. With these experiments, we attempted to answer some of the pertinent issues: (i) how does the type of secondary carbide (WC/NbC/TaC/HfC) influence friction and wear behavior, and is such influence dependent on load?; and (ii) how does the secondary carbide addition affect the stability and composition of the tribochemical layer under the selected sliding conditions? Our experimental results reveal that the added secondary carbides influence chemical interactions between different oxides and such interactions dominate the friction and wear behavior. A higher coefficient of friction (COF) range, varying from 0.75 to 0.64 was recorded at 5N; whereas the reduced COF of 0.46-0.52 was observed at 20N or 50N. The volumetric wear rate decreased with load and varied on the order of 10 −6 to 10 −7 mm 3 /Nm for the cermets investigated. The cermet containing HfC exhibited high friction and poor wear resistance. At low load (5N), the abrasion and adhesion of hard debris containing various oxides dominated the wear, and resulted in high friction and wear loss. In contrast, the more pronounced increase in friction-induced contact temperature (below 500°C) and compaction of hard debris resulted in the formation of a distinct tribochemical layer at higher loads (20N and 50N). The formation of a dense tribolayer containing oxides of iron and/or titanium is responsible for the reduced friction and wear, irrespective of secondary carbides.

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Section: A Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tribochemistry in sliding wear of TiCN–Ni-based cermets

et al. 2008

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“…B ecause of their superior mechanical properties and chemical stability, Ti(C,N)‐based cermets are frequently used in the preparation of cutting tools in parallel with relatively modern protective coatings 1 . Continuous efforts in the evaluation of the cermets showed superior erosion resistance and active–passive polarization in the electrochemical behavior for electro‐discharging machining 2,3 . At present, Ti(C,N)‐cermet cutting tools are typically used for high‐speed milling, semi‐finishing, and finishing work for both carbon and stainless steels 4 …”

Section: Introductionmentioning

confidence: 99%

Effect of Nano‐Size Powders on the Microstructure of Ti(C,N)‐xWC‐Ni Cermets

Jung

Kang

2007

Journal of the American Ceramic Society

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Microstructural and compositional analyses of Ti(C,N)–xWC–20Ni cermets were performed to understand the dissolution behavior of nano‐size Ti(C,N) and WC, compared with an ultra‐fine and a micro‐sized system. The WC content was varied from 10 wt% to 70 wt%. The rapid dissolution and reprecipitation of nano‐Ti(C,N) powders induced the formation of a coreless microstructure. With an increase in the amount of WC, the concentration of W in the rims increased but was low compared with the ultra‐fine or micrometer system. An inversion in W concentration between the inner rim and the outer rim occurred at ∼40 wt% added WC. That is, the outer rim was richer in W than the inner rim. Powder size strongly affected the dissolution and precipitation of particles and was a major determinant of the final microstructure and compositions of the rims. Furthermore, a significant improvement in toughness in the case of simple nano systems was found, compared with that of the corresponding micrometer and ultra‐fine systems (KIC 10–12 vs. 6–10 MPa·m1/2). The coreless microstructure and the high fraction of rim phase in the nano system are responsible for this difference.

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“…Besides the aspects of the microstructural investigation in various compositionally designed cermets, the tribological study on TiCN cermets has not been taken up considerably. The performance of such an important class of materials under different environments/tribological conditions: fretting, 21 erosive, 22 corrosive, 23 and die‐sinking electro‐discharge machining, 24 has recently been investigated in our research group. Nevertheless, in order to realize the tribological potential, it is important to evaluate and understand the sliding wear properties of TiCN‐based cermets under varying operating conditions (load, sliding duration, etc.).…”

Section: Introductionmentioning

confidence: 99%

Load‐Dependent Transition in Sliding Wear Properties of TiCN–WC–Ni Cermets

Kumar

Basu

Kalin

et al. 2007

Journal of the American Ceramic Society

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The present investigation aims at evaluating the sliding wear behavior of TiCN–20 wt%Ni cermets, containing varying amounts of WC (5–25 wt%) against 100Cr6 steel at different loads (5, 20, and 50 N). The dominant wear mechanisms were established by using surface topography analysis (Stylus profilometry), scanning electron microscopy, and X‐ray diffraction. The steady‐state coefficient of friction varies over a wide range: 0.73–0.27 at different loads for the investigated cermets. The volumetric wear loss of the cermets in general increases with load, while the wear rate varies in the order of 10−7 mm3·(N·m)−1. The worn surface characterization reveals that a transition in wear mechanism occurs from abrasion and mild tribo‐oxidation at low loads to the formation of a dense tribo‐oxide layer, containing oxides of Fe and Ti (essentially Fe9TiO15) at high loads. Efforts have been made to discuss the possible reaction pathways to explain the formation of the tribochemical layer. The addition of WC to TiCN–Ni‐based cermets results in increased abrasion at low loads and severe fracture of the tribo‐oxide layer at high loads.

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Electrochemical Behavior of TiCN–Ni‐Based Cermets

Cited by 44 publications

References 21 publications

Tribochemistry in sliding wear of TiCN–Ni-based cermets

Tribochemistry in sliding wear of TiCN–Ni-based cermets

Effect of Nano‐Size Powders on the Microstructure of Ti(C,N)‐xWC‐Ni Cermets

Load‐Dependent Transition in Sliding Wear Properties of TiCN–WC–Ni Cermets

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