Analysis of Microscopic Wear Mechanism of Ceramics Based on Friction Tests in the SEM

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The purpose of this investigation is to analyze microscopic wear mechanism of ceramic materials. Following results were obtained ;(1) Microscopic wear modes of ceramics can be classified into following three modes ;1) flake formation : This is the severest wear mode of ceramics by macroscopic surface crack propagation.2) powder formation : This is caused by microscopic surface crack propagation.3) plowing : This is mild wear of ceramics.(2) The condition for occurrence of flake formation can by expressed by using new dimensionless parameter Sc (=Pmax (Rmax) ^<1/2>/K_<IC>) where Pmax is maximum hertzian contact pressure, Rmax is maximum surface roughness and K_<IC> is fracture toughness.(3) The condition for occurrence of powder formation cab be expressed by using new dimensionless parameter Sc^* (=Hv (Rmax) ^<1/2>/K_<IC>) where Hv is Vickers hardness, Rmax is maximum surface roughness and K_<IC> is fracture toughness.(4) New wear equation can be obtained for estimation of wear rate of ceramics based on the above results.