Processing and oxidation response of Cr$_{2}$AlC MAX-phase composites containing ceramic fibers

Teresa Go, Robert Vaßen, Olivier Guillon, Jesus Gonzalez-Julian
2021 Open ceramics 6  
Three different ceramic matrix composites (CMCs) were produced using Cr 2 AlC as a matrix, and carbon, SiC and Al 2 O 3 short fibers as a secondary phase. Cr 2 AlC powders were synthesized by solid-state reaction, followed by mixing with the fibers, and full densification using a field-assisted sintering technique. Of the three different fiber types, Carbon fibers reacted strongly with Cr 2 AlC, while the reaction with SiC fibers was more limited and alumina fibers didn't show any reaction.
more » ... ation tests of the monolithic Cr 2 AlC and the composites were performed by thermogravimetric analysis. An alumina layer formed at 1000 C on every sample, well attached and worked as a good oxidation barrier. Under realistic conditions using a burner rig for cyclic oxidation at 1200 C for 500 cycles, the oxidation resistance of the alumina fiber CMC is good, as no defects or degradation are visible and the alumina layer is well attached.
doi:10.18154/rwth-2021-10632 fatcat:ryk5o56vtvhepcupmfuao7qu34