Wear Behavior in Thin Layered Au/SS and Au/Mo Coatings.
BATTELLE PACIFIC NORTHWEST LABS RICHLAND WASH
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Principal objectives of this work were to 1 determine if the Delamination Theory of wear could be supported by experimentally observing improved wear resistance from samples coated with thin layers of gold at or below the critical thickness and 2 to determine if laminate coatings made of alternate soft and hard materials could provide extended wear resistance. Wear tests were performed on thin layers of sputtered gold against a 52100 steel slider. Both wear rate and debris particle size decreased with decreasing coating thickness in accordance with the Delamination Theory of wear. However, for thin coatings of 250 A or less, the softer gold wore through exposing a harder stainless steel substrate. Much larger debris particles were produced when this occurred as the active shear zone apparently penetrated more deeply into the base material. Protective laminate coatings prepared by sputtering alternate layers of AuSS and AuMo did not wear by progressive attrition of each layer. Debris particles several layers in thickness were formed giving rise to apparent dislocation penetration, plastic deformation, and fracture across the interfaces. Author
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