Abstract
Natural bovine bone has the potential to act as a bearing surface for spool-in-sleeve servo valve of water hydraulics. To screen material combinations for that application, friction and wear tests were conducted on the following three pairs: 316L stainless steel on natural bovine femoral cortical bone (NBFCB), carbon fibre reinforced polyetheretherketone (CFRPEEK) on NBFCB, and Al2O3 ceramic on BFCB. Tests were conducted on a face-loaded, annular ring-on-ring configuration with water lubrication. The worn surfaces were studied using an environmental scanning electron microscope (ESEM). The effects of normal pressure and sliding velocity on the friction and wear characteristics are discussed. Friction coefficients decreased with increasing velocity and pressure, and a running-in process was observed. The weight loss due to wear of the NBFCB was larger than that of the counterpart materials. Sharp reductions in both friction coefficient and wear rate were observed for NBFCB when sliding against Al2O3 compared to sliding against 316L and CFRPEEK. The 316L steel wore by micro-cutting, and the wear mechanism of the Al2O3 ceramic was fatigue wear. The wear mechanism of CFRPEEK was mainly adhesive wear. The wear mechanism of NBFCB was brittle fracturing when sliding with 316L and the Al2O3 ceramic, and it was adhesive wear when sliding against CFRPEEK.
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