The present work has as main objective uses the technique of the interfacial indentation to get a quantitative measure of the apparent interface toughness from Ni-Cr coatings deposited in its steel substrate for three types of spray thermal. The result obtained can characterize the adhesive properties of thermal spray coatings. This technique consists in create and propagate a crack in the interface plane between a coating and its substrate, as a result of Vickers indentation. In a first stage it must be prepared the samples coated, in the adjusted way, disclosing the interface coating-substrate. Starting the indentation tests, different loads are applied at the interface, and for each test it must to measure the value of the half-diagonal of the indent and the length of the crack, and plotting these data as a function of the applied load in logarithmic scale. Using a hardness-tester, it is determined the value of the Vickers hardness and the elastic modulus both from coating and substrate. A mathematic model associate to the data obtained in the tests calculates the critical point of cracking and supplies a value quantitative the apparent interface fracture toughness wich contributing to the understand the mechanical behavior of delamination from coating-substrate. It must consider the thickness from coating that influence the values of the interface fracture toughness. The results obtained make possible to argue the initial resistance to fracture using the interface toughness and the resistance to fracture’s propagation, all indicators of the adhesion.