Open AccessHigh Temperature Akali Corrosion of Dense SiC and Si(3)N(4) Coated with CMZP and Mg-Doped Al(2)TiO(5) in Coal Gas
Author(s) -
Nguyen Thierry,
J.J. Brown
Publication year - 1997
Language(s) - English
Resource type - Reports
DOI - 10.2172/643579
Subject(s) - corrosion , materials science , thermal shock , ceramic , coating , doping , thermal conductivity , oxide , metallurgy , chemical engineering , mineralogy , composite material , chemistry , optoelectronics , engineering
Si{sub 3}N{sub 4} ceramics possess properties that are attractive for high temperature heat exchanger applications. These properties include high strength, good thermal conductivity and excellent resistance to thermal shock and oxidation. However when subjected to alkaline containing environments, Si{sub 3}N{sub 4} is prone to corrode and eventually loses its properties. Because it was found that oxide ceramics corrode substantially less, they can be used as a coating to protect Si{sub 3}N{sub 4}. Therefore the first objective of this work is to develop thin film of CMZP and Mg-doped Al{sub 2}TiO{sub 5} since both of them are good candidate coating materials of primary interest for the protection of Si{sub 3}N{sub 4} against alkaline corrosion