Abstract: Plasma-sprayed ZrO2 coating
subjected to Hot Isostatic Pressing (HIP) is more compact and
more homogeneous, having better performance and greater adhesion
strength with the steel substrate. The pores can be easily
chosed up and less cracks developed if the ZrO2 coating is doped
with appropriate amount of SiO2. After HIP treatment, the
bonding between ceramic layer and adhesion layer is of mixed
mechanical and metallurgical nature. The bonding between the
adhesion layer and the steel substrate is of pure metallurgical
nature. Fe-Al-C intermetallics containing Ni were found at the
interface which consisted of two sub-layers: the Ni containing
Fe-Al-C intermetallics and the decarburized (ferrite)
sub-layers.
Key words:
Plasma-sprayed TBCs HIP treatment
Manuscript received on March 19, 1991; revised manuscript December 2,
1991
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