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BEGIN:VEVENT
DTSTAMP:20170613T114650Z
DTSTART:20170628T130000Z
DTEND:20170628T140000Z
SUMMARY:Adaptive Tribological Coatings
UID:{http://www.columbasystems.com/customers/uom/gpp/eventid/}n5z-j3vhzvj
 h-60jpkx
DESCRIPTION:Tribological coatings\, which can re-arrange their structure 
 and chemistry in tribological contacts in response to changes in environ
 mental humidity or temperature\, \nare of a practical importance for aer
 ospace\, tooling\, automotive\, and other applications. The conceptual a
 pproaches highlighted in this presentation include “chameleon” \ncoating
 s made of hard nano-crystalline carbide\, nitride and oxide matrices wit
 h additions of nano-inclusions of soft metals (Ag\, Au)\, amorphous (MoS
 2\, carbon) phases\, \nand transition metals capable of forming lubricat
 ing ternary oxides for lubrication over broad humidly (ambient to space)
  and temperatures (from cryogenic to 1000 °C). \nThe stored materials ar
 e released from nanophase reservoirs\, facilitating chemical and structu
 ral changes of mechanical interfaces to continuously reduce friction and
  \nwear in harsh environments.  Furthermore\, coating compositions can b
 e modified to guide tribofilm formations made of oxygen defected double 
 oxides (e.g. Magnéli phases) \nas well as ternary oxides\, where interla
 yered metallic and ionic bonding along specific crystallographic orienta
 tions provides sliding friction reduction for adaptive lubrication\nin t
 he challenging mid-temperature regime of 500-700 °C. The nanocomposite “
 chameleon” structures can also be sandwiched between diffusion barrier n
 itride layers for \nextended operations and temperature cycling capabili
 ty. In addition\, coating nanostructure texture and orientation control 
 can provide an opportunity to add thermal \nmanagement functionalities\,
  using thermal conductivity anisotropy and phase transitions in tribolog
 ical contacts. Techniques for coating preparation\, methods for in-situ 
 \ncharacterization and identification of self-adaptation mechanisms\, as
  well as tribological performance of adaptive surfaces in harsh environm
 ents\, are discussed in detail.\n\nProfessor Andrey A. Voevodin holds a 
 Chair position in the  Department of Materials Science and Engineering i
 n The College of Engineering\, University of North Texas. \nBefore joini
 ng UNT in the Fall of 2015\, he was a Principal Research Scientist and T
 eam Leader at the US Air Force Research Laboratory’s (AFRL) Materials an
 d Manufacturing \nDirectorate\, where he established and led tribologica
 l\, thermal management\, and nanoelectronic material research laboratori
 es. Prof Voevodin’s expertise includes thin film \ndeposition\, plasma p
 rocesses\, surface engineering\, surface analysis\, electrical\, thermal
 \, and mechanical interfaces. His current research areas are nanolayered
 \, nanostructured\, \nand 2-dimensional materials for electron and phono
 n transport\, hybrid and pulsed plasma deposition technologies\, surface
  engineering and high temperature tribology. \nDr. Voevodin has over 300
  technical publications\, from which 220 are in peer-reviewed archived j
 ournals\, one book\, eight book chapters\, 12 patents and inventions. \n
 Dr. Voevodin is a Fellow of AVS Science and Technology Society and serve
 s as 2017 Chair for the Advanced Surface Engineering Division of AVS. \n
 Division of the AVS.\n
STATUS:TENTATIVE
TRANSP:TRANSPARENT
CLASS:PUBLIC
LOCATION:B22\, ICAM\, Pariser Building
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