Study of structural features, strength properties, and heat resistance of a dispersion-hardened composite material based on nickel intermetallide

Abstract

A method for production of a composite material (CM) hardened by hafnium oxide particles with columnar structure based on VKNA-1B grade alloy is described. The method involves making heat-resistant nickel alloy powders with a particle size ≤100 μm. The obtained powders of the matrix VKNA-1B alloy are dispersed and alloyed mechanically in an attritor with the hardening additive HfO₂, and next the semifinished material is extruded with subsequent rolling. The production technique parameters of the CM based on the nickel aluminide–HfO₂ system are determined. The developed material is intended for advanced aircraft engines, first of all, parts of a combustor, doors of a controlled nozzle, and nozzle blades of gas turbine engines (GTEs). The physical and mechanical properties and the heat resistance of the composite material obtained are studied.