CONSIDERATIONS FOR THE SELECTION OF MATERIALS FOR ELECTRICAL SPARK AND GAS FLAME SPRAYING DEPOSITION ON STRUCTURAL STEELS

Abstract

The aim of the present work is to identify and formulate the basic principles and approaches for the selection of materials for electrical spark and gas-flame stratification of structural steels. For this purpose, have been examined: -The characteristic features and physical foundations of the two methods, the changes in the composition and structure of the coating materials in the transfer process and in the formation of the coatings and the general similarities and differences. - The regularities of formation and qualitative characteristics and properties of the coatings obtained, depending on the process parameters of the coating mode and the layering material. - The interrelation between: the process parameters of the application system; the coating material; the quality characteristics, the composition, the structure of the coatings; the mechanical and the tribological properties of the coatings. The requirements for coatings have been formulated for various loads and wear cases and on this basis the requirements for the layering materials are determined by the two methods. Appropriate materials and compositions are specified for various cases of friction and wear. The main approaches to the selection of the layering materials are described.

Keywords

• electrical discharge deposition
• gas flame spraying coatings
• laminating materials
• wears resistance