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Reciprocating ball-on-disk tests were performed to investigate the effects of sliding velocity and ambient temperature on the tribological characteristics of a diamond-like carbon (DLC) coating under a boundary lubrication regime. The coating consisted of sequentially deposited gradient Cr/CrN, a-C:H:W, and a-C:H layers; the counter surface was an AISI 52100 steel ball. Average sliding velocities...
Nanomechanical response of a silicon specimen coated with a sp 3 crystalline carbon coating (1.8nm thickness) was investigated using MD simulation. A sharp conical rigid tip was impacted at the speed of 50m/s up to a depth of ~80% of the coating thickness. Unlike pure silicon specimen, no metallic phase transformation was observed i.e. a thin coating was able to resist Si-I to Si-II metallic...
The braking performance of carbon/carbon composites prepared from carbonized oxidized polyacrylonitrile fiber (OPF) and from carbon fiber (CF) felts were investigated using a friction performance tester to simulate the normal landing and rejected take-off conditions of an aircraft. The microstructures, worn surfaces and hardness of the composites were characterized by Raman spectrometry, scanning...
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