Micro- and macro-tribological properties of SiC ceramics in sliding contact

Gahr, K.‐H. Zum; Blattner, R. J.; Hwang, Dong Hwan; Pöhlmann, K.

doi:10.1016/s0043-1648(01)00595-6

Cited by 103 publications

(11 citation statements)

References 15 publications

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“…The oxidation behavior of SiC seems complex, as several reactions compete along with different corrosion processes, as is suggested by the tribochemical corrosion model of Presser et al [106].…”

Section: Discussionmentioning

confidence: 92%

“…Both action of friction and temperature (because of fast kinetics) influence the tribochemical SiC degradation. Some studies reveal that the higher the humidity, the lower the coefficient of friction and wear rates [104,105] and Zum et al demonstrated that when SiC is submitted to water, tribochemical polishing of its surface is expected due to boundary lubrication [106].…”

Section: Reaction Model For Tribochemical Corrosionmentioning

confidence: 99%

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Behavior of Silicon Carbide Materials under Dry to Hydrothermal Conditions

et al. 2021

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Silicon carbide materials are excellent candidates for high-performance applications due to their outstanding thermomechanical properties and their strong corrosion resistance. SiC materials can be processed in various forms, from nanomaterials to continuous fibers. Common applications of SiC materials include the aerospace and nuclear fields, where the material is used in severely oxidative environments. Therefore, it is important to understand the kinetics of SiC oxidation and the parameters influencing them. The first part of this review focuses on the oxidation of SiC in dry air according to the Deal and Grove model showing that the oxidation behavior of SiC depends on the temperature and the time of oxidation. The oxidation rate can also be accelerated with the presence of H2O in the system due to its diffusion through the oxide scales. Therefore, wet oxidation is studied in the second part. The third part details the effect of hydrothermal media on the SiC materials that has been explained by different models, namely Yoshimura (1986), Hirayama (1989) and Allongue (1992). The last part of this review focuses on the hydrothermal corrosion of SiC materials from an application point of view and determine whether it is beneficial (manufacturing of materials) or detrimental (use of SiC in latest nuclear reactors).

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Section: Discussionmentioning

confidence: 92%

Section: Reaction Model For Tribochemical Corrosionmentioning

confidence: 99%

Behavior of Silicon Carbide Materials under Dry to Hydrothermal Conditions

et al. 2021

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“…10(b)). Under load and at the start of a test, before the temperature increase has affected the surface hardness, the abrasion is associated with a significant cracking 11 . The majority of the micro‐cracks are radial cracking where the orientation is close to perpendicular to the movement (and to the direction of the abrasion grooves) (Fig.…”

Section: Resultsmentioning

confidence: 99%

Braking Behavior of C/SiC Composites Prepared by Chemical Vapor Infiltration

Zhang

Lou

et al. 2005

Int J Applied Ceramic Tech

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Carbon fiber‐reinforced silicon carbide matrix composites have the potential to overcome the shortcoming of the currently used carbon/carbon friction materials in aircraft brakes. In this article, the carbon/silicon carbide (C/SiC) composites were prepared by chemical vapor infiltration method, and the brake disks with different densities and component content were finally obtained. The friction coefficient and friction stability can be significantly improved by increasing both material density and carbon content. When the density of C/SiC composite is 2.3 g/cm3, the coefficient of friction measured is 0.23, the coefficient of friction stability remains about 0.43, the liner wear rate is less than 9.3 μm/cycle, and the weight wear rate is less than 9.1 μm/cycle. The rapid increase of friction coefficient approaching the end of braking is mainly related to the increasing of surface temperature in a short time and the enhanced adhesion and abrasion of contact conjunctions and asperities. The C/SiC composites exhibited a good stability of braking against fading versus the braking number and surface temperature. The surfaces of C/SiC brake disks were covered with wear debris including the fragment of carbon fibers after the braking tests. The wear on the surfaces is significantly determined by cyclic mechanical and thermal stresses, which result in the micro‐cracks in the SiC matrix, the thin flakes of the surface materials as well as the grooves.

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“…studied the subsurface damage of sc‐SiC in nanoindentation tests and reported formation of a polycrystalline structure with nanometer‐sized grain in the indented region. Wear of SiC has been investigated for instance by Zum Gahr et al ., who reported macro‐ and microtribological measurements of sc‐SiC and nanocrystalline (nc) SiC. It was demonstrated that many factors, such as the initial surface roughness, chemical composition at SiC surface, and humidity in air, can affect the coefficient of friction.…”

Section: Background and Motivationmentioning

confidence: 99%

Plasticity‐Controlled Friction and Wear in Nanocrystalline SiC

2014

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Wear resistance of ceramics can be improved by suppressing fracture, which can be accomplished either by decreasing the grain size or by reducing the size of the deformation zone. We have combined these two strategies with the goal of understanding the atomistic mechanisms underlying the plasticity-controlled friction and wear in nanocrystalline (nc) silicon carbide (SiC). We have performed molecular dynamics simulations of nanoscale wear on nc-SiC with 5 nm grain diameter with a nanoscale cutting tool. We find that grain-boundary (GB) sliding is the primary deformation mechanism during wear and that it is accommodated by heterogeneous nucleation of partial dislocations, formation of voids at the triple junctions, and grain pull-out. We estimate the stresses required for heterogeneous nucleation of partial dislocations at triple junctions and shear strength of GBs. Pile up in nc-SiC consists of grains that were pulled out during deformation. We compare the wear response of nc-SiC to single-crystal (sc) SiC and show that scratch hardness of nc-SiC is lower than that of sc-SiC. Our results demonstrate that the higher scratch hardness in sc-SiC originates from nucleation and motion of dislocations, whereas nc-SiC is more pliable due to additional mechanism of deformation via GB sliding.

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Micro- and macro-tribological properties of SiC ceramics in sliding contact

Cited by 103 publications

References 15 publications

Behavior of Silicon Carbide Materials under Dry to Hydrothermal Conditions

Behavior of Silicon Carbide Materials under Dry to Hydrothermal Conditions

Braking Behavior of C/SiC Composites Prepared by Chemical Vapor Infiltration

Plasticity‐Controlled Friction and Wear in Nanocrystalline SiC

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