High-temperature oxidation of composite AlN-ZrB₂-ZrSi₂ ceramics

Abstract

Mass transfer kinetics, structure, phase and elemental composition, micromechanical surface properties of Titanium alloys after electrcal spark and laser alloying (and their combination) by composition materials based on ZrB₂-ZrSi₂ and TiN-Cr₃C₂ systems are studied. Electrical spark alloying of both materials is characterized by relatively high ratio of mass transfer (~40- 60%) in wide range of processing time (t ≥1 min/sm²). ZrB2-ZrSi2 system based coverings at long (t =7 min/sm²) coating are found to be structurally heterogeneous heterophase surfaces, containing smoothed areas of Ti-alloy, formed as result of melt crystallization and modified by alloying components. The application of coverings containing Zirconium Diboride is shown to be perspective side by side with traditional durable coverings based on refractory Titanium solutions.