The invention discloses a high-entropy
alloy film on the surface of a
barrel inner bore and a preparation method of the high-entropy
alloy film. A
barrel inner bore base body is sequentially subjected to ultrasonic cleaning and
plasma cleaning; a
plasma sputtering method is adopted, and a WMoTaNb layer is deposited on the surface of the body tube inner bore base body subjected to
plasma cleaning based on a WMoTaNb target; a plasma
sputtering method is adopted, and a WMoTaNbSi gradient
transition layer is deposited on the WMoTaNb layer on the basis of the WMoTaNb target and the Si target; a plasma
sputtering method is adopted, a WMoTaNbSi layer is deposited on the WMoTaNbSi gradient
transition layer on the basis of a WMoTaNb target and a Si target, and a high-entropy
alloy film is obtained; the high-entropy alloy film is prepared on the surface of the inner bore to replace an original Cr
coating, the high-entropy alloy film has the advantages of being high in
melting point, low in heat
conductivity, high in
hardness, resistant to abrasion, good in high-temperature stability and the like, the problems that a traditional
electroplating Cr
coating is prone to generating thermal stress cracks and the like can be solved, and then the service life of the
barrel is prolonged.