Corrosion behavior and failure mechanism of SiC whisker and c-AlPO4 particle-modified novel tri-layer Yb2Si2O7/mullite/SiC coating in burner rig tests

Abstract The corrosion behavior of environmental barrier coatings (EBCs) directly affects the service life and stability ceramic matrix composite (CMC) structural parts in aero-engines. silicon carbide (SiC) whisker toughening phase c-AlPO 4 bonding are firstly used to improve novel tri-layer Yb 2 Si O 7 /mullite/SiC EBCs burner rig test. formation penetrating cracks coating caused failure at 1673 K. SiC whiskers mullite middle significantly inhibited coating, efficiently prevented oxidation carbon fiber reinforced (C f /SiC) samples for 360-min thermal cycles (24 times) with a weight loss 6.19×10 −3 g·cm −2 . Although particles further improved w -mullite (SM) overflow PO x gas aggravated expansion outer overall /c-AlPO -SiC (ASM)/SiC be slightly lower than that /SM/SiC coating. This study guides design modified long high-temperature high-speed environment.