Effect of Heat Treatment on Plasma-Sprayed Zircon (ZrSiO ZrSiO4)
Authors:
- 1 July 1998
- journal article
- research article
- Published by Taylor & Francis in Materials and Manufacturing Processes
- Vol. 13 (4) , 575-580
Abstract
The effect of heat treatment on the structure and properties of a plasma-sprayed zircon coating was evaluated. The as-sprayed coating, with open porosity of 10%, is composed of t-ZrO2 and amorphous SiO2 After heat treatment at 1473 K, ZrO2 grows in columnar shape perpendicular to the coating surface, while SiO2 crystallizes to cristobalite. The open porosity decreases to about 5% after the heat treatment. This can be attributed to the sintering of SiO2 and the phase transformation of zirconia. When heat-treated at 1673 K, the coating is composed of ZrSiO4 with dispersed fine m-ZrO2 The open porosity increases again up to 10%. The thermal conductivity of the zircon coating increases with increasing heat treatment temperature.Keywords
This publication has 3 references indexed in Scilit:
- Microstructural characterization of plasma-sprayed oxide ceramics.ISIJ International, 1989
- The structure of plasma dissociated zirconJournal of Materials Science, 1981
- Thermal Conductivity: X, Data for Several Pure Oxide Materials Corrected to Zero PorosityJournal of the American Ceramic Society, 1954