ELASTIC RESPONSE OF THERMAL SPRAY DEPOSITS UNDER INDENTATION TESTS

The elastic response behavior of thermal spray deposits at Knoop inden tations has been investigated using indentation techniques, The ratio of hardness to elastic modulus, which is an important prerequisite for the evaluation of indentation fracture toughness, is determined by me asuring the elastic recovery of the in-surface dimensions of Knoop ind entations. The elastic moduli of thermal spray deposits are in the ran ge of 12%-78% of the comparable bulk materials and reveal the anisotro pic behavior of thermal spray deposits, A variety of thermal spray dep osits has been examined, including Al2O3, yttria-stabilized ZrO2 (YSZ) , and NiAl, Statistical tools have been used to evaluate the error est imates of the data.