Abstract
In this work we have applied a Hays –Kendall mathematical model to the Vickers microhardness values to eliminate the troublesome indentation size effect (load dependence of hardness) and obtain a unique value representing the true hardness for each coating. Examination of the unique hardness values has been possible in conditions of heat treatment at 190 0C and 420 0C. Key words: Hays –Kendall model, Ni-P/SiC coatings, hardness, ISE effect, heat treatment