DEVELOPMENT OF ULTRA REFRACTORY MATERIALS

Abstract

Fundamental studies of the properties of solid solutions of ZrC and TaC were continued in an effort to explain certain anomalies such as the increased melting temperature and increased high temperature (above 3630 F) strength and creep resistance. It was decided to remeasure the melting temperatures. The melting point apparatus was checked for reproducibility of results by fusing several samples of refractory metal sheets, W, Ta, Mo, and Nb. The degree of precision and reproducibility of data indicated that sufficient accuracy should be obtainable in the melting point study of the ZrC-TaC system. Preliminary results were obtained on carbide bars heated directly by resistance. Apparent melting temperatures were measured on the bars up to the appearance of first droplets of liquid. A complete series of compositions is being prepared for melting temperature observations.

Document Details

Document Type
Technical Report
Publication Date
Apr 28, 1961
Accession Number
AD0255808

Entities

People

  • Peter T.b. Shaffer

Tags

DTIC Thesaurus Topics

  • Accuracy
  • High Temperature
  • Materials
  • Melting
  • Melting Point
  • Metals
  • Observation
  • Precision
  • Refractory Materials
  • Refractory Metals
  • Reproducibility
  • Resistance
  • Solid Solutions

Fields of Study

  • Materials science

Readers

  • Combustion science or combustion engineering.
  • Metallurgy
  • Surface Engineering/Surface Coating Technology.