Frictional performance of silicon carbide under different lubrication conditions

Xingyu ZHAO; Ying LIU; Qingfeng WEN; Yuming WANG

doi:10.1007/s40544-014-0039-1

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Research Article | Open Access

Frictional performance of silicon carbide under different lubrication conditions

Xingyu ZHAO, Ying LIU(), Qingfeng WEN, Yuming WANG

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

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Abstract

The frictional performance of materials used in face seals is critical to the sealing performance. Silicon carbide is commonly used in hard rings because of its abrasion resistance, corrosion resistance, and thermal shock resistance. In this study, the frictional performance of silicon carbide, including graphite-added silicon carbide, under water and lubrication-absent conditions was studied by using a Falex-1506 tribotester and different working parameters. In addition, the morphology of the worn surfaces was observed using scanning electron microscopy and the damage was characterized to understand the tribological behavior of different silicon carbides. The results suggest that the friction coefficients decrease with increasing pressure under water lubrication conditions because of the water within the holes on the surface of the materials. The percentage of water lubrication increases, whereas the percentage of solid friction decreases when the pressure increases. Under dry contact conditions, the friction coefficients change negligibly with increasing pressure and graphite-added silicon carbide shows better frictional performance.

Keywords

Silicon carbide frictional performance water, lubrication wear mechanism

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Friction

Volume 2 Issue 1,
March 2014

Pages 58-63

DOI: 10.1007/s40544-014-0039-1

Cite this article:

ZHAO X, LIU Y, WEN Q, et al. Frictional performance of silicon carbide under different lubrication conditions. Friction, 2014, 2(1): 58-63. https://doi.org/10.1007/s40544-014-0039-1

Material		Density (g/cm³)	Young’s modulus (GPa)	Porosity (vol%)
Without graphite	WNV2	3.06	374	2.5
Without graphite	R	2.96	356	2.5
With graphite	CHV1	3.07	297	2.5
With graphite	R2	2.83	349	2.5

Lubrication conditions	Loading range (MPa)	Velocity range (m/s)	PV(MPa·m/s)	Duration (min)
Deionized water	0.70-2.80	5.074	3.55-14.21	10
Dry contact	0.31-0.69	0.665	0.21-0.46	10

Pair conditions	No.	Friction pairs
Self-mated pair	1	WNV2/WNV2
	2	CHV1/CHV1
	3	R/R
	4	R2/R2
Nonself-mated pair	5	WNV2/CHV1
	6	WNV2/R2
	7	CHV1/R2
	8	R/R2