Distinctive Characteristics of Multilayer and Single-Layer Coatings under High-Temperature Testing

Layer-by-layer deposition of zirconium and chromium nitrides is a promising material for hard coatings; however, this process is complex and not well documented in the literature. The problem lies in the difficulty of depositing thick layers of multi-component coatings with different physical characteristics, particularly the coefficient of linear thermal expansion (CLTE). As coatings undergo thermal exposure during deposition and use, different CLTEs can lead to cracking and product failure. The aim of the study is to perform on-site analysis of ZrN/CrN multilayer coatings using synchrotron radiation and investigate the micro-stress behavior of coatings deposited on a VK8 alloy substrate at temperatures up to 750 degrees C. X-ray analysis and methods such as CLTE and qualitative determination of type II micro-stresses were used in the study. The results show changes in the characteristics of multilayer coatings during heating, the ability to determine the coefficient of thermal expansion, and qualitative determination of micro-stresses. The study provides recommendations for the application of multilayer coatings with specified characteristics.