DEVELOPMENT OF ULTRA REFRACTORY MATERIALS
Abstract
Room temperature investigations of various physical, mechanical and electrical properties of solid solutions of TaC and ZrC showed no evidence of discontinuous changes indicating new phases or compound formation after a wide variety of annealing treatments. Emissivity studies, however, indicate the probable existence of high temperature phases of both TaC and ZrC, though not of the solid solutions. The reported increase in melting temperature of ZrC-TaC solid solutions was confirmed. Preliminary studies indicate that Lithafrax low expansion lithium aluminum silicate has a thermal shock resistance factor more than twice as great as Pyroceram 9606 and more than four times as great as alumina. 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1961
- Accession Number
- AD0268076
Entities
People
- Peter T.b. Shaffer
- Richard L. Watts