DEVELOPMENT OF ULTRA REFRACTORY MATERIALS
CARBORUNDUM CO NIAGARA FALLS N Y
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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.