THE STRUCTURE, HEAT RESISTANCE, AND FRACTURE TOUGHNESS OF THE LAMINATE COMPOSITE BASED ON NIOBIUM WITH BORIDOSILICIDE STRENGTHENING
Published: 29 Jul 2017
Abstract: The technique of solid-state making of a laminate composite based on niobium with boride-silicide strengthening is presented. The technique consists in diffusion welding of a package of niobium foils covered with a suspension of silicon and boron powders in vacuum under pressure. The research of the micro-structure has determined that the composite represents the alternation of the layers of boron solid solution in niobium and the layers of intermetallic compounds. The strength testing in the temperature range 20–1500°C has shown quite acceptable strength under satisfactory fracture toughness at room temperature. The combination of ductile layers of solid solutions and high-strength brittle layers of intermetallic compounds assures the necessary mechanical characteristics.
Keywords: laminate composite, multilayer package, diffusion welding, solid-phase interaction, niobium, boride, silicide, structure, strength, fracture toughness
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