The invention discloses a
zirconium nitride aluminum /
aluminium oxide composite coating firmly combined with a hard
alloy. The
zirconium nitride aluminum /
aluminium oxide composite coating is a whole composed of five sublayers of a CoNiCrAlY high entropy
alloy bonding layer, an alpha-Cr2O3
oxide template layer, an alpha-Al2O3 oxide supporting layer, a AlZrON
nitric oxide cohesion layer and a AlZrN
nitride wearing layer, wherein the five sublayers are arranged from the inside to outside in sequence, and the
total thickness of the
coating is 1-2.5 microns. A preparation method of the
coating comprises the following steps that after a hard
alloy substrate is heated and subjected to
ion etching, firstly, a CoNiCrAlY layer is deposited on the substrate by using an
electric arc evaporation platingprocess, and then the alpha-Cr2O3 layer, the alpha-Al2O3 layer, the AlZrON layer, and the AlZrN layer are sequentially deposited by using a magnetron
sputtering process. The high entropy alloy bonding layer is adopted, different functional sub-
layers cooperate with one another, so that the bonding between the
coating and the hard
alloy substrate is firm, the comprehensive performance of the coating is excellent, the process is simple, and the implementation is easy.