DEVELOPMENT OF ULTRA REFRACTORY MATERIALS. Summary Report, November 1, 1960-October 31, 1961

Technical Report · Thu Nov 30 04:00:00 EST 1961

OSTI ID:4810279

Shaffer, P T.B.; Watts, R L

Room temperature investigations of various physical, mechanical and electrical properties of solid solutions of tantalum carbide and zirconium carbide showed no evidence of discontinuous changes indscating new phases or compound formation after a wide variety of annealing treatments. Emissivity studies indicate the probable existence of hightemperature phases of both tantalum carbide and zirconium carbide, though not of the solid solutions. The reported increase in melting temperature of ZrC --TaC solid solutions has been confirmed. Preliminary studies indicate that Lithafrax low expansion lithium aluminum silicate has a thermal shock resistance factor more than twice as great as Pyrocerasm 9606 and more than four times as great as aluniina. Electrical properties, with the possible exception of dissipation factors, are within acceptable limits. Similar lithium aluminum silicate compositions with effectively zero expansion are known. These would, therefore, have infinite thermal shock resistance factors. (auth)

• Research Organization: Carborundum Co. Research and Development Div., Niagara Falls, N.Y.
• NSA Number: NSA-16-004542
• OSTI ID: 4810279
• Report Number(s): NP-11160
• Country of Publication: United States
• Language: English

Related Subjects

ALLOTROPY
ALUMINUM OXIDES
ALUMINUM SILICATES
ANNEALING
ELECTRIC PROPERTIES
ELECTRICITY
EXPANSION
HEAT TREATMENTS
LATTICES
LITHIUM SILICATES
MELTING POINTS
METALS, CERAMICS, AND OTHER MATERIALS
REFRACTORIES
SOLID SOLUTIONS
TANTALUM CARBIDES
THERMAL STRESSES
ZIRCONIUM CARBIDES