DEVELOPMENT OF A SUBSCALE MANUFACTURING PROCESS FOR THE FABRICATION OF HYPEREUTECTIC TRANSITION-METAL CARBIDE COMPOSITES.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1968
- Accession Number
- AD0841550
Entities
People
- D. P. Moak
- E. L. Foster Jr.
- S. G. Nelson
Organizations
- Battelle Memorial Institute