Processing and Deposition of Nanocrystalline Oxide Composites for Thermal Barrier Coatings.
Progress rept. 1 Oct-31 Dec 99
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING
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This report describes the synthesis, thermal stability and coating of nanocrystalline oxide composites for thermal barrier coating applications. The composites consisted of alumina-zirconia and alumina-yittria stabilized zirconia. The effect of alumina and yittria content on zirconia phase stability was examined. It was found that alumina-zirconia composites underwent phase transformation upon heat treatment at 950-1100 C. A small amount of yttria additive 1 prevented zirconia phase transformation. Addition of alumina to the yttria stabilized zirconia system suppressed grain growth below 1100 C. The yttria stabilized zirconia powders were successfully coated onto Ni substrates using electrophoretic deposition. The composition of the coating solution was systematically varied to attain the optimal suspension for coating applications.
- Coatings, Colorants and Finishes
- Properties of Metals and Alloys