Thermal Conductivity Study of Plasma-Sprayed Iron-Based Coatings.

Plasma spraying technology, known for its efficient surface enhancement capabilities, has been widely applied in aerospace, automotive manufacturing, and power generation. Ironbased coatings, due to their superior mechanical properties and wear resistance, have become important materials in these fields. However, under extreme working conditions such as high temperatures, high speeds, and heavy loads, the thermal conductivity of the coating directly affects its service life and stability. Therefore, studying the thermal conductivity of plasma-sprayed iron-based coatings is of great significance. Currently, research on the thermal properties of plasma-sprayed coatings primarily focuses on the surface thermal conductivity, neglecting the complex coupled heat transfer mechanisms within the coating. Moreover, existing research methods often rely on empirical formulas or simplified models, making it challenging to comprehensively reflect the thermal conductivity behavior under actual working conditions. This is especially true in hightemperature and high-pressure environments where the limitations of these methods are more pronounced. This paper establishes a coupled heat transfer model for plasma-sprayed iron-based coatings to explore their thermal conductivity under different working conditions. The study comprises three parts: first, the mathematical derivation of the coupled heat transfer model within the plasma-sprayed iron-based coating; second, the determination of conduction boundary conditions and the calculation of heat transfer coefficients; third, the simulation results of the thermal conductivity characteristics of the plasma-sprayed iron-based coating. This research not only fills the gaps in existing studies but also provides reliable theoretical support and data reference for practical engineering applications. [ABSTRACT FROM AUTHOR]