Accession Number : AD0841550

Title :   DEVELOPMENT OF A SUBSCALE MANUFACTURING PROCESS FOR THE FABRICATION OF HYPEREUTECTIC TRANSITION-METAL CARBIDE COMPOSITES.

Descriptive Note : Final rept. 1 Aug 66-31 Jul 68,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH COLUMBUS LABS

Personal Author(s) : Foster, E. L., Jr. ; Nelson, S. G. ; Moak, D. P.

Report Date : SEP 1968

Pagination or Media Count : 339

Abstract : Consumable-electrode arc melting and nonconsumable-electrode skull arc melting were investigated as possible manufacturing processes for the preparation of hypereutectic zirconium and hafnium carbide alloys. Variables in these processes were examined in detail. Forty-two experimental consumable-electrode runs resulting in castings up to 5 inches in diameter were performed. Techniques for preparing satisfactory castings up to 3-1/2 inches in diameter by this latter process were developed. The developed process consisted of two steps: prealloying and drop-casting. These steps are described. Over 1500 skull arc melting and casting runs were performed which yielded castings suitable for over 175 environment test specimens and 275 property test specimens. Thermal-conductivity, thermal-expansion, and heat-capacity measurements were made on specimens of ZrC+C alloys (19.7 to 24.4 wt % carbon) over the temperature range 70 to 4500 F and of HfC+C alloys (13.5 to 15.8 wt % carbon) over the temperature range 70 to 5000 F. Tensile tests, compression tests and dynamic-modulus measurements were also performed on these alloys at 70, 3500, and 4500 or 5000 F. Data obtained in these measurements are presented. (Author)

Descriptors :   (*COMPOSITE MATERIALS, MANUFACTURING), HAFNIUM COMPOUNDS, ZIRCONIUM COMPOUNDS, GRAPHITE, MELTING, CASTING, THERMAL CONDUCTIVITY, THERMAL EXPANSION, SPECIFIC HEAT, MECHANICAL PROPERTIES, EUTECTICS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE