Mechanical and fracture properties of thermal barrier coatings fabricated using slurry spray technique

Abstract

Thermal barrier coatings were introduced to reduce operating temperatures and thermal stresses in structures and machine components across a wide range of industries and applications more than 40 years ago. Recently a new, relatively simple and low cost manufacturing method of thermal barrier coatings based upon the slurry spray technique has been developed with a focus on aerospace applications. The challenge in the development of this technique was to achieve the coating quality comparable to the existing manufacturing methods, which are often expensive and inapplicable to coat large or curved surfaces. This paper describes the developed technique and presents selected results of thermo-mechanical and fracture testing of the thermal barrier coatings including graded coatings fabricated using this new method.