This two-part article (Part I was published on pages 54-60 in the March 2006 issue of JCT COATINGSTECH) briefly reviews the development of mar/scratch characterization techniques,and focuses on single-probe tests with nano instruments which have been widely used recently.Quantitative measurements of micro mar resistance (MMR),different responses of the coatings to the marring stress (i.e.,elastic response,plastic deformation,and abrasive wear),and critical forces for rough trough,cracking,delamination,and chipping are described,as are some complementary test methods.
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