As an advanced structural material widely used in aerospace field，environmental barrier coatings are necessary for ceramic matrix composites in actual service environment. Tantalate is a promising environmental barrier coating material due to its excellent high-temperature thermo-mechanical properties and a thermal expansion coefficient of ((3.5–5.5)×10

–6

K

–1)

suitable for ceramic matrix composites. (AlTa)

x

B

2–2x

O4/(RE–Al)TaO

4

composite coatings were successfully prepared on the surface of silicon carbide fiber reinforced silicon carbide matrix c

omposites (SiC

f

/SiC) by atmospheric plasma spraying (APS) process. The optimum heat treatment conditions of the coating were explored. At the same time

the thermal fatigue test and bending strength test of composite coating samples with different coating structure schemes were carried out at 1300 ℃

and the coating structure with the best thermal fatigue resistance was selected. The surface morphology

crack propagation and element distribution of the coating were analyzed and characterized by XRD

SEM and metallographic microscope. Compared with the traditional coatings

the tantalate composite coating has become a potential environmental barrier coating due to its excellent comprehensive performance at high temperature.