Heavy Vehicle Propulsion Materials: Recent Progress and Future Plans

Abstract

The Heavy Vehicle Propulsion Materials Program provides enabling materials technology for the U.S. DOE Office of Heavy Vehicle Technologies (OHVT).The technical agenda for the program is based on an industry assessment and the technology roadmap for the OHVT. A five-year program plan was published in 2000. Major efforts in the program are materials for diesel engine fuel systems, exhaust aftertreatment, and air handling. Additional efforts include diesel engine valve-train materials, structural components, and thermal management.Advanced materials, including hightemperature metal alloys, intermetallics, cermets, ceramics, amorphous materials, metal-and ceramicmatrix composites, and coatings, are investigated for critical engine applications. Selected technical issues and planned and ongoing projects as well as brief summaries of several technical highlights are given.

Ultra‐Low Friction on 100Cr6‐Steel Surfaces After Direct Laser Interference Patterning

“…The primary coherent laser beam was split into several beams by one or two beam splitters (4). With highly reflective mirrors (5), the beams were then recombined to interfere on the sample's surface (6) at an interference angle of 2.0°(2D-patterns), and 2.3°(1D-patterns). A mechanical shutter (1) was used to define the number of pulses irradiating the substrate.…”

“…In Equation 6, h 1 and h 2 are the maximum and minimum lubricant film thicknesses. The slope a becomes:…”

“…[2][3][4] Due to stricter regulations to reduce carbon dioxide (CO 2 ) emission from cars, innovative solutions must therefore be developed to improve the tribological performance of mechanical components, for example, by using low friction materials, coatings, and lubricants. [5][6][7] Surface texturing is also found to be beneficial for tribological properties of many mechanical components. Positive results for textured surfaces in components were reported for mechanical seals, piston rings, and thrust bearings.…”