Thermal spray processing

Conference · Wed Mar 01 04:00:00 EST 1995

OSTI ID:63484

Herman, H; Berndt, C C

Thermal spray processing has been used for a number of years to cost-effecticely apply TBC`s for a wide range of heat engine applications. In particular, bond coats are applied by plasma spray and HVOF techniques and partially-stabilized zirconia top coats are applied by plasma spray methods. Thermal spray involves melting and rapid transport of the molten particles to the substrate, where high-rate solidification and coating build-up occur. It is the very nature of this melt processing that leads to the unique layered microstructure, as well as the apparent imperfections, so readily identified with thermal spray. Modeling the process, process-induced residual stresses, and thermal conductivity will be discussed in light of a new understanding of porosity and its anisotropy. Microcracking can be understood using new approaches, allowing a fuller view of the processing-performance connection. Detailed electron microscopic, novel neutron diffraction and fracture analysis of the deposits can lead to a better understanding of how overall microstructure can be controlled to influence critical properties of the deposited TBC system.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• OSTI ID: 63484
• Report Number(s): N--95-26119; NASA-CP--10170; E--9509; NAS--1.55:10170; CONF-9503150--
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
33 ADVANCED PROPULSION SYSTEMS
HEAT ENGINES
PROTECTIVE COATINGS
SPRAY COATING
THERMAL CONDUCTIVITY
THERMAL SHIELDS
ZIRCONIUM OXIDES