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access icon openaccess Comparative evaluation on friction and wear characteristics of SiC, Si3N4, Al2O3, and ZrO2 sliding against PEEK composite for seawater hydraulic axial piston pumps

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 03/10/2018, Accepted 12/10/2018, Published 22/10/2018

Comparative investigation on friction and wear properties of SiC, Si3N4, Al2O3, and ZrO2 lubricated with seawater was carried out on a ring-on-ring contacted tribological test apparatus, and their worn surfaces were observed by an ultra-depth optical microscope. The results reveal that the friction coefficients of Si3N4 and SiC are obviously lower than those of Al2O3 and ZrO2 when they slide against the polyetheretherketone (PEEK) composite in seawater, and the friction stability of ZrO2 is so poor that it is not suitable for seawater hydraulic piston pumps. When the contacted load increases from 400 to 1000 N, the wear rate of Al2O3 is still the highest, while the wear rates of SiC and Si3N4 change from positive to negative, which indicates that plastic transfer is occurred under a heavier load. When they slide against the PEEK in seawater, the main tribological mechanism of SiC, Si3N4, and Al2O3 is slightly abrasive wear, while both abrasive wear and adhesive wear occur for ZrO2. Generally, both SiC and Si3N4 have wide prospect applied in seawater hydraulic piston pumps, and particularly Si3N4 exhibits excellent friction and wear properties in seawater.

Inspec keywords: pumps; zirconium compounds; pistons; wear testing; optical microscopy; lubricants; hydraulic systems; sliding friction; seawater; adhesion; abrasion; polymers; alumina; silicon compounds; lubrication; wear resistance

Other keywords: abrasive wear; ultradepth optical microscope; SiC; seawater hydraulic axial piston pumps; ring-on-ring contacted tribological test apparatus; polyether ether ketone composite; PEEK composite; Al2O3; ZrO2; adhesive wear; friction coefficients; worn surfaces; Si3N4; plastic transfer

Subjects: Fluid mechanics and aerodynamics (mechanical engineering); Mechanical components; Tribology (mechanical engineering); Other specific mechanical properties (mechanical engineering); Engineering materials; Testing

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