Solid State Science and Technology, Vol. 19, No 1 (2011) 32-39

ISSN 0128-7389

 *Corresponding Author: istikama@sirim.my

 

ATMOSPHERIC PLASMA SPRAY OF NiCrAlY BOND COAT WITH DIFFERENT FEED RATES

S. Istikamah*, M. F. Fazira and R. J. Talib

Advanced Material Research Center (AMREC) SIRIM Berhad,

Lot 34, Jalan Hi-Tech 2/3, Kulim Hi-Tech Park,

09000 Kulim Kedah, Malaysia

 

 

ABSTRACT

Thermal barrier coating (TBC) is used to reduce the temperature imposed on hot section

of the component, which are subjected to high temperature such as gas turbine and

diesel engine. TBC consist of a metal bond coat (MNiCrAlY, M=Ni Co) and a ceramic

top layer (ZrO2/Y2O3). The bond coat is used to mediate the contact between the top

coat and the metal alloy substrates, while the top coat of zirconia coating offer an

excellent thermal shock resistance as a thermal barrier coating. In this study, the bond

coat of Ni22Cr10Al1.0Y powders were deposited on M2 steel substrates by

atmospheric plasma spray technique repeated at three different feed rate i.e., 0.5, 1.0,

1.5 rpm while other parameters were kept constant. The surface morphology

demonstrates overlapping splat and other appears to be poorly consolidated by fine

particles, with no definite splat structure. Results show that an increase in feed rate

resulted in increase of thickness of bond coat and surface roughness but decrease in

hardness of the coatings. The studies also show that deposition of ZrO2-8Y2O3 has

higher resistance towards hot corrosion when compared to the application of bond coat

only.

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