Studying High-Temperature Hardness of Powder Cobalt Alloys, Reinforced with Niobium or Titanium Carbides

Abstract

The hardness of powder cobalt alloys in the room temperature–1150 °C temperature range is investigated. The alloys are prepared by hot pressing of cobalt, chromium, aluminum, and iron powders with titanium or niobium carbides. The hardness of alloys reinforced with 30 to 50% (vol.) carbide at various temperatures show that the amount of the hardening phase affects the hardness of the alloys investigated. The most significant factor, which affects the hardness of the alloys, is the temperature factor: with increasing temperature the indicators of the hardness reduces regardless of the type and content of carbide. It is shown that the hardness of the alloys with titanium carbide exceeds that of the alloys with niobium carbide. These results could be used to create friction materials for aviation purposes.