RESEARCH STUDY TO DETERMINE THE PHASE EQUILIBRIUM RELATIONS OF SELECTED METAL CARBIDES AT HIGH TEMPERATURES

Abstract

The work reported is the result of an investigation of phase equilibria in the binary system, tungsten-carbon. A tentative phase diagram is presented which differs significantly from the one proposed by Sykes in 1930 and which is generally accepted today. The data were obtained by high-temperature differential thermal analysis and classical quenching procedures, both supplemented by metallographic, x-ray, and chemical techniques. Results for the tungsten-carbon binary system indicate a eutectic between W and W2C at 2735 C, and a eutectic between W5C3 and C at 2765 C. The W2C lattice accommodates 72 and 74 atomic per cent W at 2475 degrees and 2735 C, respectively. Carbon solubility is evident only at 2540 C, the eutectoid temperature. A new phase, W5C3, was discovered which is stable only above 2540 C. WC decomposes at 2730C into W5C3 and C.

Document Details

Document Type
Technical Report
Publication Date
May 01, 1961
Accession Number
AD0278009

Entities

People

  • R.t. Dolloff
  • R.v. Sara

Tags

DTIC Thesaurus Topics

  • Diagrams
  • Differential Thermal Analysis
  • High Temperature
  • Metals
  • Phase
  • Phase Diagrams
  • Quenching
  • Solubility
  • Thermal Analysis
  • Tungsten
  • X Rays

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.
  • Theoretical Analysis.