Type
Text
Type
Thesis
Advisor
Christopher M. Weyant. | Sanjay Sampath | Dilip Gersappe.
Date
2011-08-01
Keywords
Materials Science -- Energy | Coatings, HVOF, Plasma Spray, Silicate, Silicon Carbide, Thermal Spray
Department
Department of Materials Science and Engineering
Language
en_US
Source
This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree.
Identifier
http://hdl.handle.net/11401/71685
Publisher
The Graduate School, Stony Brook University: Stony Brook, NY.
Format
application/pdf
Abstract
Environmental barrier coatings are a key technology for implementing ceramics in high- temperature, high-moisture environments. One such ceramic, silicon carbide, is a material that can be used in gas turbines. However, silicon carbide oxidizes into silicon dioxide with exposure to oxygen, carbon dioxide, and water vapor and would normally provide protection for the silicon carbide. However, silicon dioxide volatilizes in a gas turbine environment, which leads to the degradation of its mechanical properties, making it unfit for use in a gas turbine. Materials like yttria-monosilicate and barium-strontium doped aluminosilicate (BSAS) both have good environmental coating properties. However, sintered yttria-monosilicate does not bond well to silicon carbide, and thermally sprayed BSAS transforms very slowly from a metastable hexacelsian phase to the desired celsian phase that is necessary for it to bond well to silicon carbide. Coatings of these materials have been produced by plasma spray with some additional work using HVOF. Phase identification has been done by x-ray diffraction, and microstructural analysis has been done using scanning electron microscopy.
Recommended Citation
Sagiv, AriIsaac, "Silicate-Based Thermal Spray Coatings for Environmental Protection of Silicon Carbide" (2011). Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions). 890.
https://commons.library.stonybrook.edu/stony-brook-theses-and-dissertations-collection/890