DEVELOPMENT OF PROTECTIVE COATINGS FOR TANTALUM BASE ALLOYS.

Abstract

Progress is reported on coatings for the protection of tantalum-base alloys from oxidation at temperatures of 1650 to 2200 C. The following metals were oxidizer under various conditions: Hf-25 Ta alloy; Hf1Ni alloy; Hf3Ni alloy; reactor and spectrographic grades of Hf; Thoriated and unalloyed W; Ir30Rh alloy; Ir30Pt alloy; Unalloyed Ir. Alloy additions of Rh and Pt appeared to improve the oxidation resistance of Ir which, even in the unalloyed condition, demonstrated a resistance to the ingress of oxygen greater than the resistance of the Hf-25Ta alloy for oxidation in flowing dry air. Diffusional compatibility studies were made for the Hf-HfO2 and Ir-W systems and accidentally for the Ir-ThO2 system. The incipient melting points (solidus temperature) of the Ir30Rh and Ir30Pt alloys were determined. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1965
Accession Number
AD0476386

Entities

People

  • R. T. Wimber

Tags

DTIC Thesaurus Topics

  • Coatings
  • Melting
  • Melting Point
  • Metals
  • Oxidation
  • Oxidation Resistance
  • Protective Coatings
  • Resistance
  • Tantalum

Fields of Study

  • Materials science

Readers

  • Combustion science or combustion engineering.
  • Materials Science
  • Metallurgy