Phase Relationships in High Temperature Ceramics. Phase 1
Abstract
The objective of this work was to establish an efficient means of determining the high temperature phase behavior of the HfO2-Ta2O5 system under conditions of relevance to their potential use in propulsion system environments. A primary objective was to establish melting temperatures for the mixed oxides and to identify phases formed in the high temperature portions of the phase diagram, above 2500 F (1400 C). The approaches evaluated included traditional anneal quench studies and use of CO2 laser heating in controlled atmospheres. Melting points were measured using an optical pyrometer/laser fusion approach. Phases formed were characterized primarily by x-ray diffraction and electron microscopy. the liquidous curve for the oxide system has been established and two new phases identified for the oxide system. Keywords: Ceramics, Phase diagram, Solubility.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1987
- Accession Number
- ADA204630
Entities
People
- R. P. Turcotte