TY  - JOUR
AU  - Wolf, Markus
AU  - Mack, Daniel Emil
AU  - Mauer, Georg
AU  - Guillon, Olivier
AU  - Vaßen, Robert
TI  - Crystalline ytterbium disilicate environmental barrier coatings made by high velocity oxygen fuel spraying
JO  - International journal of applied ceramic technology
VL  - 19
IS  - 1
SN  - 1744-7402
CY  - Oxford [u.a.]
PB  - Wiley-Blackwell
M1  - FZJ-2021-03136
SP  - 210-220
PY  - 2022
AB  - Dense environmental barrier coatings (EBCs) are an essential prerequisite to exploit the advantages offered by SiC-based fiber reinforced ceramic matrix composites (CMCs) to increase efficiency in gas turbines. Today's state-of-the art materials for application as EBCs are rare-earth (RE) silicates which, however, form amorphous phases upon rapid quenching from the melt. This makes their processing by thermal spray a challenge. Recently, high velocity oxygen fuel (HVOF) spraying was proposed as potential solution since the melting degree of the feedstock can be controlled effectively. This work studies the deposition of ytterbium disilicate (YbDS) at short stand-off distances and variant total feed rates and oxy-fuel ratios of the working gas. It was found that the overall degree of crystallinity could be kept at high level above 90%. The kinetic energy transferred by impinging particles was found to be an effective parameter to control the densification of the coatings. Porosities well below 10% were achieved while fully dense coatings were impeded due to the progressive accumulation of stresses in the coatings.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000677874500001
DO  - DOI:10.1111/ijac.13829
UR  - https://juser.fz-juelich.de/record/894261
ER  -