Abstract No.:
4723

 Scheduled at:
Wednesday, May 11, 2016, Room 3E 2:00 PM
Suspension Spraying II


 Title:
Microstructural control on yttria stabilized zirconia coatings by suspension plasma spraying

 Authors:
Junya Kitamura* / Oerlikon Metco (Japan) Ltd, Japan
Kazuya Fujimori/ Oerlikon Metco (Japan) Ltd, Japan
Jing Liu/ Oerlikon Metco (US) Inc., USA
Brian Callen/ Oerlikon Metco (Canada) Inc., Canada
Tetsuyoshi Wada/ Oerlikon Metco (Japan) Ltd, Japan

 Abstract:
Yttria stabilized zirconia (YSZ) coatings are widely applied to aerospace and industrial gas turbine industries as thermal barrier to protect base alloys against high temperature. Several kinds of microstructures, such as porous, dense vertically cracked (DVC) and columnar, are intentionally designed and used properly depending on requirement and environment. Suspension plasma spraying (SPS) has been actively studied recently because it has possibility to realize much better properties than atmospheric plasma spraying as well as reduction of coat and process time than physical vapor deposition.
In this study, influence of particle size and solid concentration in ethanol base suspension as well as spray parameters, such as plasma gases, plasma power, nozzle size, spray distance (SD) and suspension feeding rate have been investigated to find out how to control microstructure of YSZ coatings using SPS with cascaded arc torch. Shorter spray distance is effective to have DVC when using relatively coarser particle of 0.6 micron. Columnar like structure tends to have at longer SD. The structural change from DVC to columnar like has been occurred at much shorter SD when using fine particles of 0.2 micron, suggesting that coarser particle would have the possibility to keep DVC at much longer SD.


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