Abstract
Dissociation of zircon in a thermal plasma jet stream is utilized as a single-step process to prepare mullite/zirconia ceramic composites by plasma spraying zircon/alumina mixtures. The crystallization behavior of the zircon and alumina mixtures after plasma spraying was studied in the present paper. The spheroidized powders appear to have the characteristics of a single-phase mixture as well as that of diphasic mixture. Two exotherms were detected in the differential thermal analysis (DTA) curve up to 1600 °C. The first exothermic peak in the DTA curve at 985 °C is found to be due to the formation of primary mullite and spinel, while the second exotherm at 1250 °C is due to secondary mullite formation. Cristobalite was found at a very narrow temperature range between 1050 °C and 1100 °C. The mullite that crystallized in the initial stage had a larger lattice parameter than the stoichiometric mullite.
| Original language | English |
|---|---|
| Pages (from-to) | 57-63 |
| Number of pages | 7 |
| Journal | Materials Letters |
| Volume | 48 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Mar 2001 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering