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Micrographs of the microholes on the carbide surface: (a,b) a sample embedded without CaF2 for sliding friction test and for cutting test, (c) enlarged micrograph corresponding to the micro-hole in (b,d,e) corresponding EDX composition analysis of point A and B in (c,f) enlarged micrograph corresponding to the micro-hole in (c,g,h) sample embedded with CaF2 for the sliding wear test (SC1) and for the cutting test (SCT1).
