Studium vlastností pájek s vloženými karbidy wolframu

Abstract

HLAVATÝ Petr. Study of the properties of solders reinforced with tungsten carbides, Ostrava, 2022. Dissertation Thesis. VSB - Technical University of Ostrava Department of Mechanical Technology, Faculty of Mechanical Engineering. Supervisor: prof. Ing. Petr Mohyla, Ph.D. The current trend in the engineering and construction industry is to extend the life of components using new materials and technologies. During the operation of the equipment, wear of parts occurs in extremely stressed components, when it is necessary to replace the entire part or renovate the worn part. The materials of these machine parts are subject to many types of wear, such as abrasion, adhesion, erosion, etc. Renovation processes aim to extend the life of the equipment. The dissertation thesis deals with the study of the properties of deposition layers created by soldering using an oxyacetylene flame, brazing method 912 with anchored tungsten carbide particles. Three types of solder WSC 553, Z-Terradur and Durit CS were used in the work, applied on base material S235JR. The main objectives of the thesis include the analysis of structural transformations and metallurgical processes in three types of deposit layers with different sizes of tungsten carbide particles. Individual types of layers were subjected to the RWAT (Rubber Wheel Abrasion Test) test, the analysis of microhardness of selected areas were also assessed, metallographic assessment and chemical analysis of the layers using electron microscopy and comparison of the amount and sizes of tungsten carbide particles on the final life of the surface. The result of the dissertation thesis is an assessment of the properties of different solders with embedded tungsten carbides layers grains with the aim of extending the service life of the components used in practice while maintaining operational safety.