A STUDY OF THE ZIRCONIA-SCANDIA SYSTEM.
Abstract
A tentative diagram for phase relationships in the ZrO2-Sc2O3 system is presented based principally on metallographic analysis of as-cast and annealed specimens of ingots prepared by arc melting together calculated amounts of ZrO2 and Sc2O3. A melting point vs. composition study and a somewhat cursory X-ray investigation were conducted; data from these studies are incorporated in the presentation. Briefly, the ZrO2 -rich region of the system has been left open, since further study is required to define relationships in this portion of the diagram. Two intermediate phases, one at approximately 25 w/o (approximately 23.0 m/o) Sc2O3 (designated gamma) and one at 32 w/o (29.6 m/o) to 42 w/o (39.3 m/o) Sc2O3 (Designated delta), have been positioned. A eutectic L approaches limit of delta + Sc2O3 solid solution has been placed at approximately 55 w/o (52.2 m/o) Sc2O3 and 2450C. There is a broad solubility of Sc2O3 for ZrO2; a single-phase field exists from 77 w/o (74.0 m/o) Sc2O3 to 100% Sc2O3. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1966
- Accession Number
- AD0649380
Entities
People
- Robert F. Domagala
Organizations
- IIT Research Institute