Characterization of the Hexagonal-Close-Packed Intermetallic Compound from the Mo-Rh, Mo-Ir, and Mo-Pt Systems
Abstract
The results of an investigation of the hexagonal-close-packed intermetallic compound found in the Mo-Rh, Mo-Ir, and Mo-Pt systems are reported. The compound was characterized by determining room and elevated- temperature hardness values, room-temperature electrical resistivity, oxidation resistance during exposure to air at 538 C (1000 F) and 982 C (1800 F), and corrosion resistance to aqueous solutions containing 41.6 or 70.9% nitric acid. The room-temperature hardness of the compound is reported to range between 300 and 675 DPH and is inversely proportional to the molybdenum content of the alloy. The molybdenum-iridium alloys are harder than the sapphire indentor at test temperatures between 1093 and 1649 C (2000 and 3000 F). The oxidation resistance of the alloys at 538 C (1000 F) decreases as the molybdenum content increases. Only the 80% Rh -20% Mo alloy resisted oxidation at 982 C (1800 F) during a 10-hour exposure. All the alloys resist corrosion by dilute and concentrated nitric acid.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1969
- Accession Number
- AD0849163
Entities
People
- J. Dahl
- M. Semchyshen.