Methods of improving the quality and reliability of technological machines and aggregates by restoring parts and assemblies

To date, the restoration of parts and assemblies of pyrolysis reactors have been determined by methods of modifying the contacting surfaces. As is known, there are three modification methods: methods of chemical and physical deposition of contacting coatings, as well as thermomechanical treatment. The choice of a particular method, as a rule, is determined by the scope of application of technological equipment. Another important factor affecting the quality of the contacting surface after modification is the residual stresses that occur in the coatings during cooling after application. In this study, a finite element method is proposed for quantifying thermal stresses using the Klein equation. This equation makes it possible to predict stresses in both single-layer and multi-layer contact surfaces. For simplicity of modeling, the contacting surface is represented by the "substrate-coating" system.