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http://bura.brunel.ac.uk/handle/2438/1320
Title: | Rolling contact fatigue performance of HIPed Si3N4 with different surface roughness |
Authors: | Kang, J Hadfield, M Cundill, R |
Keywords: | Surfaces;Fatigue;Si3N4;Roughness;WEAR |
Issue Date: | 2001 |
Publisher: | Elsevier |
Citation: | Ceramics International, 27(7): 781-794 |
Abstract: | Accelerated rolling contact fatigue four-ball tests were performed on hot isostatically pressed (HIPed) silicon nitride/steel contacts under lubricated condition using a PLINT TE92/HS microprocessor controlled rotary tribometer at a maximum compressive stress of 6.58 GPa and at a speed of 10,000 rpm for 135-200 million stress cycles. Rolling track surfaces were examined by optical microscopy, SEM, 3-D surface analysis, atomic force microscopy and interference profilometry. Experimental results show that with an initial roughness value R-a from 0.016 to 0.094 mum, the surfaces became smoother during testing and surface pitting (10-20 mum) occurred. For the surfaces with a roughness value R-a from 0.002 to 0.008 mum, the surfaces became rougher and lubricant oil residues were deposited at the edges of rolling track. Some small and shallow surface pitting 2-3 mum in size was also observed. Some scratch marks left on the surface by the previous lapping process were further extended during testing. R-a and R-q are still most important roughness parameters in relation to rolling contact behaviour. The effects of other surface roughness parameters, such as the shape of the valley. R-sk and R-ku are not obvious in this study. |
URI: | http://bura.brunel.ac.uk/handle/2438/1320 |
DOI: | https://doi.org/10.1016/s0272-8842(01)00030-x |
ISSN: | 0272-8842 |
Appears in Collections: | Design Mechanical and Aerospace Engineering Brunel Design School Research Papers |
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