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3822 |
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Wednesday, May 21, 2014, Hall H1 & H2 11:50 AM Aviation Industry 1 |
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Various thermal barrier coatings produced by axial injection plasma spray |
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Zhaolin Tang* / Northwest Mettech Corp., Canada G. Masindo / Northwest Mettech Corp., Canada D. Barentzen/ Northwest Mettech Corp., Canada K Staas/ Northwest Mettech Corp., Canada Z. Celler/ Northwest Mettech Corp., Canada |
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Thermal barrier coatings (TBCs) have been employed for many years to protect metallic components of hot sections of aerospace and land-based turbines and increase their efficiencies through increase of operating temperatures. TBC coatings are primarily deposited by either air plasma spraying (APS) or electron beam physical vapor deposition (EB-PVD). TBC microstructures have significant effects on their properties and consequently their applications. This paper presents highly durable TBCs, applied by an advanced axial injection plasma spraying technology. Axial injection plasma spraying is a versatile tool capable of controllably producing a variety of TBCs with different microstructures. These include traditional porous TBCs , advanced dense vertically cracked TBCs, and columnar TBCs. These various microstructures and their properties are discussed from point of view of their current and future applications. Special attention is given to Axial Suspension Plasma Sprayed columnar TBCs. This types of TBCs have properties that are similar or better than those produced by EB PVD technology, and offer a viable alternative for aircraft turbine components. |