On the surface and system performance of thermally sprayed carbide coatings produced under controlled residual stresses

摘要

System level evaluation of structurally integrated coatings is critical to understanding their abilities to sustain and tolerate loads experienced during operation. Residual stress is a specific coating quality that tends to be overlooked in generalized assessment, especially as it relates to a coating's integration into larger systems. Due to difficulties in residual stress measurement, more tangible and readily measured properties, such as hardness and wear behavior are favored in evaluation yet can also be misleading with regards to ultimate integrated performance. This study seeks to clarify the role of process induced residual stress through a systematic investigation of design relevant properties of carbide coatings subjected to controlled changes in chemistry and processing/deposition energies. Results from such coupling of coating and system level properties can lead to better overall coating integration in complex engineering systems.