The invention discloses an anti-
cavitation composite coating and a preparation method thereof. The anti-
cavitation composite coating is prepared from composite
powder composed of a high-entropy
alloy powder source and 0.01 wt%-50 wt% of a second phase strengthening
powder source through hypersonic
flame spraying. The high-entropy
alloy powder source is composed of elements Al, Ti, V, an element represented by m and an element represented by n. After the high-entropy
alloy composite powder is designed and prepared, the
cavitation-
erosion-resistant
composite coating containing the double-phase high-entropy alloy and the dispersed second-phase structure is prepared by adopting a hypersonic
flame spraying and surface strengthening method, the thickness is 100-400 microns, and the
bonding strength of the
coating and a matrix can reach 75 MPa or above. The preparation method is low in cost, simple and easy to control and high in production efficiency; the prepared composite
coating is uniform in structure, high in
bonding strength, high in strength and rigidity, good in
toughness and
plasticity, high in compactness and the like, the use performance of the anti-cavitation
coating can be effectively improved, the service life of the anti-cavitation coating can be effectively prolonged, and the actual requirements of
hydraulic machinery are met.