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Chen, Ming; Kato, Koji; Adachi, K.

doi:10.1023/a:1016621929078

Cited by 88 publications

(44 citation statements)

References 13 publications

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“…[1]. Until now, most research about ceramic friction under water lubrication is focused on low friction behavior and its mechanism [2][3][4][5][6][7][8][9][10][11][12]. Although SiC ceramics have high corrosion resistance or chemical inertness under static conditions, they will undergo tribochemical reactions and suffer more severe wear during sliding in water [2,[8][9][10]12].…”

Section: Introductionmentioning

confidence: 99%

Friction and wear properties of CNx/SiC in water lubrication

2005

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Amorphous carbon nitride coatings (a-CN x ) were deposited on SiC disk by ion beam assisted deposition (IBAD). The tribological behavior of a-CN x coating sliding against SiC ball in water was investigated and compared with that of SiC/SiC system at room temperature. The influences of testing conditions on friction coefficient and specific wear rate of both kinds of tribopairs were studied. The worn surfaces on disks were observed by scanning electron microscope (SEM). The results indicate that the running-in period of a-CN x /SiC was shorter than that of SiC/SiC system in water. At a sliding velocity of 120 mm/s, the mean steady-state friction coefficients of SiC/SiC (0.096) was higher than that of a-CN x /SiC (0.05), while at 160 mm/s, lower friction coefficient (0.01) was obtained for SiC/SiC in water. With an increment of normal load, the mean steady-state friction coefficients after running-in first decreased, reaching a minimum value, and then increased. For self-mated SiC, the specific wear rate of SiC ball was a little higher than that of SiC disk, while for a-CN x /SiC, the specific wear rate of SiC ball were 10 times smaller than that of a-CN x coating. Furthermore, the specific wear rate of SiC ball sliding against a-CN x coating was reduced by a factor up to 100$1000 in comparison to that against SiC in water. The wear mechanism of SiC/SiC system in water is related to micro-fracture of ceramic and instability of tribochemical reaction layer. Conversely, wear mechanism for a-CN x /SiC is related to formation and transfer of easy-shear friction layer.

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Section: Introductionmentioning

confidence: 99%

Friction and wear properties of CNx/SiC in water lubrication

2005

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“…SiC, which is generally harder, more brittle, more wear resistant, and chemically more inert than Si 3 N 4 [9], has shown more consistent l values (around 0.01) in water over a broad range of speeds and loads [2,3,11]. This higher degree of chemical inertness of SiC can be attributed to the difference in electronic properties of Si 3 N 4 and SiC.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, their resistance to corrosion [2] and the extremely low friction forces observed at high speeds in an aqueous environment [1][2][3][4][5][6][7][8][9][10][11][12][13], even lower than some metal-oil systems [2], have led to an interest in tribological applications of Si 3 N 4 and SiC in water, such as in water pumps without separate oil lubrication.…”

Section: Introductionmentioning

confidence: 99%

“…The aqueous lubrication properties of Si 3 N 4 are particularly interesting because very low coefficients of friction (l \ 0.001 [2,3,11,12]) can be achieved in water alone. These low l values can only be achieved at high speeds ([40 mm/s) [3,12] with an estimated water film thickness of 5-70 nm [3,10].…”

Section: Introductionmentioning

confidence: 99%

“…This higher degree of chemical inertness of SiC can be attributed to the difference in electronic properties of Si 3 N 4 and SiC. Water has a band gap of 8.0 eV, and Si 3 N 4 and SiC have band gaps of 5.0 and 2.8 eV, leading to differences compared to the band gap of water of 3.0 and 5.2 eV, respectively [11]. Consistent with the theory of Klopman, who proposed that a smaller band gap difference among reagents leads to a higher reaction rate [15], SiC requires a much longer running-in time and much higher sliding speeds (500 mm/s) [12] to yield l values that are as low as those of Si 3 N 4 .…”

Section: Introductionmentioning

confidence: 99%

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Aqueous Lubrication of SiC and Si3N4 Ceramics Aided by a Brush-like Copolymer Additive, Poly(l-lysine)-graft-poly(ethylene glycol)

et al. 2009

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We have examined the adsorption properties of poly(L-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG)-a brush-like polymer-on Si 3 N 4 and SiC surfaces and determined its impact on the aqueous lubrication of Si 3 N 4 and SiC at various speeds and applied loads. The addition of PLL-g-PEG in aqueous solution reduces the interfacial friction forces significantly for self-mated sliding contacts of these two ceramics, as compared to lubrication with water or buffer solution alone. For SiC, the improved lubricating performance by addition of PLL-g-PEG was apparent for all tested speeds (from 1.4 to 185 mm/s under 2 N load). For Si 3 N 4 , the effect was more apparent in the slow-speed regime (B20 mm/s under 2 N load) than in the high-speed regime ([100 mm/s), where extremely low coefficients of friction (l B 0.006) are readily achieved by aqueous buffer solution alone. It was further observed that the optimal lubricating effect with Si 3 N 4 is achieved when the tribopairs are first run-in in polymer-free aqueous buffer to render the sliding surfaces smooth, after which the PLL-g-PEG copolymer is added to the buffer solution.

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Case Study: Magnesium–Silicon Carbide Particulate‐Reinforced Composites

Basu

Kalin

2011

Tribology of Ceramics and Composites

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Untitled

Cited by 88 publications

References 13 publications

Friction and wear properties of CNx/SiC in water lubrication

Friction and wear properties of CNx/SiC in water lubrication

Aqueous Lubrication of SiC and Si3N4 Ceramics Aided by a Brush-like Copolymer Additive, Poly(l-lysine)-graft-poly(ethylene glycol)

Case Study: Magnesium–Silicon Carbide Particulate‐Reinforced Composites

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