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SUMMARY:Developing and Selecting Tribological Coatings - Professor Allan M
 atthews\, School of Materials\, the University of Manchester\, Director BP
  International Centre for Advanced Materials
DTSTART:20180208T113000Z
DTEND:20180208T123000Z
UID:TALK97588@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:The talk begins with a brief perspective on the historical bac
 kground to the subject of Tribology. In regard specifically to the develop
 ment of wear theories\, for many years it was widely believed that the bes
 t way to reduce the wear of a surface was to make it harder. This idea was
  implicit in one of the guiding ‘laws’ of wear (Archard’s Wear Law) 
 which states that wear rate is directly proportional to load and inversely
  proportional to hardness. In practice\, this ‘law’ doesn’t always h
 old true. What we now know is that (particularly for coated surfaces) both
  the elastic modulus (E) and the hardness (H) must be considered together 
 when seeking to provide protection. In fact it is the ratio H/E which give
 s us the best indicator of wear resistance\, especially for coatings. In t
 his talk\, the reasons for this are discussed and the implications for the
  development of improved wear-resistant surfaces are outlined\, with examp
 les of surfaces which take the optimisation of the H/E ratio as the goal. 
 Examples of coatings which achieve this are discussed\, including nanocomp
 osite and nanolayered coatings. Mention is also made of so-called ‘duple
 x’ coating systems\, which combine surface treatments with coatings to g
 ain maximum tribological benefits. 
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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