The Effects of Particle Size on the Microstructural Properties of YSZ 50%wt – LZ 50wt% Composite Thermal Barrier Coating

Utku Orcun Gezici, Muhammet Karabas, Ayse Kiliç, Ismail Yilmaz Taptik

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Thermal barrier coatings (TBC), are used to protect the
base material against elevated temperature and other
environmental impacts in the high-temperature
applications such as gas turbine blades. The
microstructure design of thermal barrier coatings
directly affects the coating properties. In the
microstructure of TBC; cracks, gaps, semi–melted
phases are valid. Microstructural differences occur in
the variation of the process parameters. Spray distance,
powder particle size, feed angle and rate, base material
type and temperature are the effective parameters of
microstructural differences. In this study, the thermal
barrier coating material used as yttria stabilized zirconia
(YSZ); examined in three classes according to their
particle size as finer, medium and coarse, respectively.
Other process parameters are kept constant. Also
commercial YSZ (Sulzer AMDRY 6643) is used as
reference in the study for comparison. YSZ is stirred
with 50 wt% Lanthanum zirconate (LZ). Mixed
powders are coated on stainless steel with Atmospheric
Plasma Spray (APS) method using 9MB plasma gun.
The effects of different powder particle size on the
porosit, and surface roughness are investigated with The
Scanning Electron Microscopy (SEM) analyses.
Original languageEnglish
Title of host publication18th International Metallurgy & Materials Congress
PublisherInternational Metallurgy & Materials Congress
Pages153-155
Publication statusPublished - 2016
Externally publishedYes

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