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Using an environment-controlled atomic force microscope, the nanowear of silicon against SiO2 microsphere was investigated under various relative humidity (RH) and ethanol partial pressure (Pa/Psat) conditions. When RH was below 10%, there was no discernable wear of the substrate in any Pa/Psat conditions. However, when RH>10%, although the contact pressure (1.3GPa) was far less than the yield...
By using an atomic force microscopy, the wear tests of Si(100) surface against SiO 2 microsphere were performed both in water and in air. During the tests, the contact pressure was varied between 0.78GPa and 1.1GPa, the displacement amplitude was set as 250nm and the number of wear cycles was 200. As a comparison, the wear tests of Si(100) surface against diamond tip were also performed in...
The ultrathin DLC coatings with thickness of 2nm and 5nm were deposited onto Si(100) substrate by the filtered cathodic arc technique. The nanowear tests were performed on DLC coatings and Si(100) substrate by diamond tip and SiO 2 microspheric tips. The results indicated that the coatings could support an indentation with a peak contact pressure of 7GPa. During scratch tests, the critical...
By using an atomic force microscopy, the wear tests of Si(100) surface against SiO 2 microsphere were performed both in water and in air. During the tests, the contact pressure was varied between 0.78GPa and 1.1GPa, the displacement amplitude was set as 250nm and the number of wear cycles was 200. As a comparison, the wear tests of Si(100) surface against diamond tip were also performed in...
By using a servo-hydraulic reciprocating sliding apparatus, the wear tests of Si(100) surface against SiO 2 sphere (Si/SiO 2 ) were performed under four kinds of atmosphere conditions, namely as pure nitrogen, dry and humid air, and pure oxygen. Three kinds of silicon samples with different surface hydrophilicity were prepared for wear tests. To simulate the contact in microelectromechanical...
Friction heat induced by high sliding speed affects tribologial properties. Tribological behaviours of chromium steels were investigated using a pin-on-disc tribometer in various atmospheres (O 2 , N 2 and CO 2 ). The tests had performed at sliding speeds from 30 to 60m/s and a contact pressure of 1.33MPa. The results show that the wear rate of the steel pin is the lowest in...
The frictional behavior of spheroidal fullerene C 70 has been studied for the first time. For the sublimated pure C 70 films on Si(001), a high friction coefficient was observed under different pin materials. It changed from 0.5 with an Al 2 O 3 pin to about 0.9 with a 440C stainless steel pin. The relatively high friction coefficient of the C 70...
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